Exhibit 2.1
                                                                     -----------

                            ASSET PURCHASE AGREEMENT


     THIS ASSET PURCHASE AGREEMENT (this "Agreement"),  made and entered into as
of the 17th day of September  1997, by and between Noxso  Corporation,  a debtor
and debtor in possession in the below-referenced  bankruptcy case and a Virginia
corporation  having  its  principal  office at 2414  Lytle  Road,  Bethel  Park,
Pennsylvania  15102 ("Noxso"),  and Republic Financial  Corporation,  a Colorado
corporation,  having its principal  office at 3300 South Parker Road, Suite 500,
Aurora, Colorado 80014 ("Republic").

                                   WITNESSETH:

     WHEREAS,  on  February 6, 1997,  Olin  Corporation  ("Olin")  and two other
creditors of Noxso filed an involuntary bankruptcy petition in the United States
Bankruptcy Court for the Eastern District of Tennessee  ("Bankruptcy  Court") at
Case No. 97-10709;  

     WHEREAS,  on June 4,  1997,  Noxso  consented  to the entry of an order for
relief and  converted  the case to a case under  Chapter 11 of the United States
Bankruptcy Code (the "Bankruptcy Code");

     WHEREAS,  Noxso  owns a liquid  sulfur  dioxide  plant  located on the Olin
property in Charleston,  Tennessee (the "Facility") which is described with more
particularity in Exhibit A hereto;

     WHEREAS,  Noxso and  Republic  have  entered  into a letter of intent dated
August 15, 1997 (the "Letter of Intent")  which Letter of Intent  describes  the
terms and  conditions  pursuant  to which  Noxso will sell,  and  Republic  will
purchase, the Facility; and







     WHEREAS, as contemplated by the Letter of Intent, Noxso and Republic desire
to set forth such terms and  conditions  in this  definitive  purchase  and sale
agreement; 

     NOW,  THEREFORE,  in  consideration  of the mutual  covenants,  conditions,
stipulations and agreements hereinafter set forth, the parties hereto, intending
to be legally bound hereby, do mutually warrant, agree and covenant as follows:

     1. Sale of  Assets.  On the terms and  subject  to the  conditions  of this
Agreement,  on the  Closing  Date (as that term is defined in Section 3 hereof),
Noxso shall sell, convey, assign, transfer and deliver to Republic, and Republic
shall  purchase  and  acquire  from  Noxso,  the  Facility  and  related  assets
including,  without limitation,  the Noxso technical  information related to the
Facility,  the  fixtures  and  personal  property,  all of which  are part of or
located at the Facility and which are listed in Exhibit A hereto.  Exhibit A may
be amended  prior to the  completion  of due  diligence.  The Facility  shall be
transferred pursuant to the Sale Order (as hereinafter defined) to Republic free
and clear of any claims, liens,  encumbrances,  rights of ownership or rights of
occupancy, possession or use by any party other than Republic.

     2. Instruments of Conveyance and Transfer. On the Closing Date, Noxso shall
deliver to Republic such bills of sale and other good and sufficient instruments
of  conveyance,  satisfactory  in form and  substance to  Republic,  as shall be
effective pursuant to the Sale Order to vest in Republic, upon the Closing Date,
full and complete  right,  title and interest in and to the  Facility,  free and
clear of all  claims,  liens,  encumbrances,  rights of  ownership  or rights of
occupancy,

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possession or use by any party other than Republic.  On the Closing Date,  Noxso
shall deliver possession of the Facility to Republic.

     3. Closing. The closing (the "Closing") shall be held on the first business
day that occurs at least eleven (11) days after the sale contemplated  hereby is
approved  by order  of the  Bankruptcy  Court  in the case of Noxso  Corporation
administered  at Case No.  97-10709,  or on such other  date as may be  mutually
agreed to by the parties (the "Closing Date").

     4. Purchase Price.

     (a) Republic  shall,  on the Closing  Date, in full  consideration  for the
Facility,  pay to Noxso the sum of Eleven  Million  Dollars  ($11,000,000)  (the
"Purchase Price") in immediately available funds by wire transfer as follows:

                                 PNC BANK, N.A.
                             ABA Transit #043 000096
                               For the Benefit of
                            Doepken Keevican & Weiss
                           Iolta Client Trust Account
                               Account #000268231

     (b) Republic and Noxso agree that the Purchase  Price shall be allocated as
set forth in a letter dated September 17, 1997, attached hereto as Exhibit D.

     5.  Liabilities  Not  Assumed.  Noxso shall use its best  efforts to obtain
Bankruptcy  Court  approval to assume the License  Agreement for Sulfur  Dioxide
Technology  effective September 1, 1995, (the "License Agreement") between Noxso
and Calabrian Corporation

                                        3





("Calabrian")  and to assign the License  Agreement to Republic  pursuant to the
Sale Order. In the event that Republic reaches  agreement with Calabrian for use
of the Calabrian  technology and  proprietary  information  which is part of the
Facility, Republic shall provide Noxso with notice of said agreement. Noxso then
shall withdraw its request for approval of the License Agreement. Other than any
obligation  arising  under the License  Agreement if and after it is assigned to
Republic,  Republic  shall not  assume any  existing  or future  liabilities  or
obligations of Noxso with respect to the Facility.

     6. Condition of Facility. As between Noxso and Republic, the Facility shall
be transferred on an "as is, where is" basis, and without any warranty,  express
or implied  (except as to title and as otherwise  set forth  herein),  as to the
condition, value, suitability for a particular purpose, merchantability,  or any
other  representation  or warranty by Noxso with  respect to the Facility or its
condition, capabilities or operations.

     7. Bankruptcy Court Approval.  This Agreement is subject to the approval of
the Bankruptcy  Court.  Within five (5) days of the execution of this Agreement,
Noxso shall  prepare  and file a motion for  Bankruptcy  Court  approval of this
transaction,  including the assumption and assignment of the License  Agreement,
which  Noxso will use its best  efforts to obtain  (the "Sale  Motion").  In the
event the  Bankruptcy  Court  denies the Sale  Motion on a  substantive  and not
procedural  basis,  Noxso  shall  have  no  obligation  to  appeal  or  to  seek
reconsideration  of any order of the Bankruptcy  Court. The Sale Motion shall be
scheduled for hearing in order to comply with

                                        4





the notice provisions of the Bankruptcy Code and the Federal Rules of Bankruptcy
Procedure and subject to the Court's calendar.

     8.  Representations  and Warranties of Noxso.  Noxso hereby  represents and
warrants to Republic as follows:

     (a)  Organization;  Good  Standing;  Power.  Noxso  is a  corporation  duly
organized and validly  existing under the laws of the  Commonwealth  of Virginia
with all requisite power and authority to own, operate and lease its properties,
to carry on its business as now being conducted and to enter into this Agreement
and perform its obligations hereunder.

     (b) Authority Relative to Agreement.  Subject to Bankruptcy Court approval,
the execution, delivery and performance of this Agreement by Noxso has been duly
and  effectively  authorized  by all necessary  corporate  action on the part of
Noxso.  Subject to  Bankruptcy  Court  approval,  this  Agreement  has been duly
executed by Noxso and is a valid, legally binding and enforceable  obligation of
Noxso.

     (c) Litigation. Except for the matters set forth in Exhibit B, there are no
actions,  proceedings,  judgments  or  claims  now  pending,  or, to the best of
Noxso's knowledge, threatened against or regarding the Facility.

     (d) Title to Facility. Noxso has good title to the Facility and will on the
Closing  Date  deliver  possession  and  transfer,  convey and  assign  good and
marketable title to Republic free and clear of all claims, liens,  encumbrances,
rights of ownership or rights of occupancy, possession or use by any party other
than Republic.

     (e)  Solicitation.  Noxso  has  not  solicited  or  negotiated  with  other
prospective purchasers since the execution of the Letter of Intent.


                                        5





     9. Representations, Warranties and Covenants of Republic. Republic
hereby represents and warrants to Noxso as follows:

     (a)  Organization;  Good Standing;  Power.  Republic is a corporation  duly
organized,  validly existing and in good standing under the laws of the State of
Colorado and has all requisite  corporate  power and authority to own, lease and
operate its  properties,  to carry on its business as now being conducted and to
enter into this Agreement and perform its obligations hereunder.

     (b) Authority  Relative to Agreement.  On the Closing Date,  the execution,
delivery and  performance  of this Agreement and the  transactions  contemplated
hereby by Republic will have been duly and  effectively  authorized and ratified
by all  necessary  corporate  action by Republic.  This  Agreement has been duly
executed by Republic and is a valid, legally binding and enforceable  obligation
of Republic.

     (c) Financial Ability.  As of the Closing Date, Republic will have adequate
funds  available  to it  to  purchase  the  Facility  in  accordance  with  this
Agreement.


     10.  Conditions  Precedent to the  Obligations of Republic.  Other than the
condition  specified in Section  10(a),  Republic's  obligation  to purchase the
Facility shall be conditioned  upon the following  (collectively,  the "Republic
Conditions  Precedent") having been satisfied in a manner acceptable to Republic
or waived in Republic's sole discretion prior to the Closing Date.

     (a)  Republic  or  its  consultants  shall  have  conducted  due  diligence
satisfactory  to  Republic  in its  sole  discretion,  exercised  in  Republic's
reasonable business judgment,  confirming,  by an independent  engineering firm,
the adequacy of the  technology  for the Facility and  confirming  other matters
that may come to Republic's  attention  during due diligence deemed necessary to
the continued  operation and  condition of the  Facility,  including  regulatory
issues

                                        6





related to the  Facility,  in each case in form and  substance  satisfactory  to
Republic;  provided,  however,  that, in any event,  such due diligence shall be
completed  prior to the date of the hearing on the Sale Motion.  Republic  shall
notify Noxso in writing  prior to the hearing date that it has completed its due
diligence and, unless it has given or concurrently gives a notice of termination
pursuant to Section 12 hereof as a result of said due diligence, that subject to
the  satisfaction of the other conditions set forth in this Section 10, Republic
will  close the  transactions  contemplated  hereby on the terms and  conditions
contained herein.

     (b) The Bankruptcy  Court shall have approved this Agreement by order ("the
Sale  Order") (i) which shall grant the Sale  Motion,  (ii) which shall  provide
that the  transfer of the  Facility  to Republic  shall be free and clear of all
claims,  liens,  encumbrances,  rights of  ownership,  or  rights of  occupancy,
possession  or use by any party other than  Republic,  (iii) which shall provide
that this Agreement,  any related  agreements and the transactions  contemplated
hereby and thereby are approved,  (iv) which shall  provide that Republic  shall
have no liability for any  obligations or liabilities of Noxso other than as set
forth herein, (v) which shall provide that all liens,  encumbrances,  claims and
interests with respect to the Facility shall attach to the proceeds of the sale,
(vi) which shall  provide that the License  Agreement is assumed and assigned to
Republic   (unless   Republic  and  Calabrian  enter  into  a  separate  license
agreement),  (vii) which shall be in form and substance satisfactory to Republic
and,  (vii)  from  which  Sale  Order no appeal  shall have been filed or, if an
appeal is filed,  no court of  competent  jurisdiction  has issued a stay of the
Sale Order.

     (c) Olin and Republic shall have entered into an SO2 Purchase  Contract for
output from the Facility in a form and with terms and conditions satisfactory to
both Olin and Republic and all conditions precedent in the SO2 Purchase Contract
shall have been satisfied except for the closing of the sale;

                                        7





     (d) Republic shall have entered into a Backup SO2 Supply  Agreement in form
and with  terms and  conditions  satisfactory  to  Republic  and all  conditions
precedent in the Backup SO2 Supply  Agreement  shall have been satisfied  except
for the closing of the sale;

     (e) Republic shall have entered into an elemental sulfur Purchase Agreement
and a Backup  Sulfur  Agreement,  a Commodity  Swap  Agreement or other  support
mechanism  (the  "Sulfur  Agreements")  in form and with  terms  and  conditions
satisfactory to Republic and all conditions  precedent in the Sulfur  Agreements
shall have been satisfied except for the closing of the sale;

     (f) Republic shall have entered into an Operation and Maintenance  Contract
with an operator  satisfactory to Republic in form and with terms and conditions
satisfactory  to Republic  and all  conditions  precedent in the  Operation  and
Maintenance  Contract  shall have been  satisfied  except for the closing of the
sale;

     (g) Republic  shall have entered into or obtained such other  agreements or
consents which it deems to be necessary in its reasonable business judgement for
the ownership or operation of the Facility;

     (h)  Republic  shall have entered into an  agreement  with  Calabrian  with
regard to the use of Calabrian  technology and  proprietary  information in form
and with terms and conditions satisfactory to Republic (the  "Republic/Calabrian
Agreement")  and all conditions  precedent in the  Republic/Calabrian  Agreement
shall have been satisfied except for the closing of the sale.

     (i) Republic  shall have entered into a Technical  Support  Agreement  with
Olin or an engineering  firm in form and with terms and conditions  satisfactory
to Republic;

     (j) Republic shall have entered into Purchase  Agreements for the provision
of any  chemicals,  gases  or other  input/process  materials  required  for the
effective operation of the

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Facility  for the  purpose  for  which it was  built in form and with  terms and
conditions satisfactory to Republic;

     (k) Republic  shall have entered into a ground lease with Olin for the site
of the Facility  having a base term of at least twenty four (24) years and being
in a form and having other terms and conditions satisfactory to Republic;

     (l) Any and all existing or potential  litigation  brought by Noxso against
Olin shall have been resolved to the satisfaction of Republic;

     (m) Any and all existing or potential claims, litigation,  mechanics' liens
or  encumbrances  alleged by any creditor of Noxso  against Olin  regarding  the
Facility  shall have been  resolved to the  satisfaction  of  Republic; 

     (n) The  representations  and  warranties  of Noxso set forth in  Section 8
shall be true and correct as of the Closing Date;

     (o) All consents,  approvals,  permits and other requirements prescribed by
any law,  rule or  regulation  which must be obtained by Republic  and which are
necessary for the consummation of the transaction  shall have been obtained from
the appropriate governmental bodies or agencies, as determined in Republic's and
Olin's discretion;

     (p) No  material  adverse  change  in the  condition,  rights  to  use,  or
operation  of the  Facility  shall have  occurred  since the  completion  of due
diligence pursuant to Section 10(a).

     Republic shall attempt in good faith to satisfy those  Republic  Conditions
Precedent  over  which  it has  control  and  which in its  reasonable  business
judgment  are  capable  of  satisfaction.  Acceptance  or a waiver of any of the
Republic Conditions Precedent will be at the sole discretion of Republic.


                                        9





     11. Conditions Precedent to the Obligations of Noxso. Noxso's obligation to
sell the Facility shall be conditioned upon the following Conditions Precedent:

     (a) Entry of the Sale Order and no appeal  from the Sale  Order  shall have
been filed or, if an appeal is filed,  no court of  competent  jurisdiction  has
issued a stay of the Sale Order.

     (b) The representations, warranties, and covenants of Republic set forth in
Section 9 shall be true and correct as of the Closing Date.

     12. Termination.

     (a) This  Agreement may be terminated at any time prior to the Closing Date
by mutual written consent of Republic and Noxso.

     (b) Republic may terminate  this  Agreement at its option by written notice
to Noxso (i) that,  prior to the  hearing on the Sale  Motion and in  accordance
with Section 10(a), it determines  through its due diligence for any reason that
the technology  for the Facility or any other  material  aspect of the Facility,
including regulatory approvals,  is inadequate or (ii) in the event that Closing
has not  occurred  on or before  December  31,  1997 for any  reason  other than
Republic's material breach of its obligations hereunder.

     (c) Noxso may terminate  this  Agreement at its option by written notice to
Republic in the event that Closing does not occur on or before December 31, 1997
for any reason other than Noxso's material breach of its obligation hereunder.

     13. Exclusivity/Higher and Better Offers.

     (a) Noxso  acknowledges  its obligations not to negotiate or solicit offers
under the Letter of Intent.  Upon signing this  Agreement,  Noxso agrees that it
will not negotiate terms of any alternative funding or sale of the Facility with
any third party or execute any agreement

                                       10





with any third party for the purchase of the Facility. Noxso further agrees that
it will not permit any agent or representative of Noxso to do so.

     (b) Republic recognizes that the proposed purchase is subject to higher and
better  offers,  which  may be  presented  at the  hearing  on the Sale  Motion.
Accordingly,  subject to the restriction in Section 13(a) above, Noxso, Olin and
the  Committee  may,  without  the   participation  of  Republic,   provide  any
information or documentation reasonably required by other potential bidders.

     14. Fees, Expenses, Overbid Protection.

     (a) In the event that Noxso does not or cannot proceed with the sale of the
Facility  because (i) Noxso  refuses to sell to  Republic,  (ii) the  Bankruptcy
Court  refuses to enter the Sale Order or (iii) the  Facility is sold to a third
party or is refinanced, then Republic shall be entitled to receive reimbursement
of its reasonable,  documented  out-of-pocket expenses plus a fee equal to 2% of
$11,000,000. In no event will such reimbursement and fee exceed $385,000.

     (b) In the  event  that  the  sale is not  consummated  because  any of the
Republic  Conditions  Precedent  to the  sale are not  satisfied  or  waived  by
Republic, Republic shall not be entitled to such reimbursement or fee.

     (c) This  obligation for  reimbursement  of the expenses and payment of the
fee will be treated as Administrative Expenses of Noxso's bankruptcy case.

     (d) Noxso  agrees to pay any  expenses  and the fee due to  Republic at the
earlier of (i) payment of Administrative  Expenses in the bankruptcy case or any
subsequent  Chapter 7 case , (ii) the  closing on the sale of the  Facility to a
third  party  following  a hearing on the Sale  Motion,  (iii) the  closing of a
financing secured by the Facility or, (iv) upon receipt of other

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revenues  which Noxso may receive with respect to the Facility or its  operation
or with respect to supplying sulfur to the Facility.

     (e) At the hearing on the proposed  sale to Republic,  the initial  topping
bid from a third party, if any, must represent a purchase price that is at least
3.5% higher than $11,000,000,  a total purchase price of at least $11,385,000 or
its equivalent as concerns Noxso's unsecured creditors.

     15. Miscellaneous Provisions.

     (a)  Expenses.  Except as provided in Section 14 above,  Noxso and Republic
each will bear its own expenses required by or incident to this Agreement.

     (b) The  Sale  Motion,  the  Sale  Order,  and any  other  motion  or order
involving  the  Facility,  Republic,  Olin,  or parties  asserting  liens on the
Facility must be reviewed and approved by Republic prior to submission.

     (c) Governing Law. This Agreement and the transactions  contemplated herein
shall be governed by, interpreted, construed and enforced in accordance with the
laws of the State of Tennessee.  For as long as Noxso's  bankruptcy case remains
open,  disputes relating to the  interpretation or enforcement of this Agreement
shall be heard by the Bankruptcy  Court.  Thereafter,  disputes  relating to the
interpretation  or  enforcement  of this  Agreement may be heard by any court of
competent jurisdiction.

     (d) Entire  Agreement.  This  Agreement  constitutes  the entire  agreement
between  the  parties  relating to the sale and  purchase  of the  Facility  and
supersedes  the  Letter of Intent  dated  August  15,  1997,  between  Noxso and
Republic.

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     (e) Amendments  and  Modifications.  This Agreement  shall not be modified,
amended or changed in any respect except in writing duly signed by an authorized
officer of each of the parties hereto.

     (f) Captions.  The captions in this Agreement are solely for the purpose of
reference  and  shall  not in any  manner  alter or vary the  interpretation  or
construction of this Agreement.

     (g)  Successors  and  Assigns.  At any time prior to Closing,  Republic may
assign  its rights  under  this  Agreement  to an  affiliate.  In the event that
Republic  assigns this  Agreement to an affiliate,  Republic shall remain liable
for the  obligations  hereunder.  All the terms and provisions of this Agreement
shall be binding  upon and shall inure to the benefit of the parties  hereto and
their heirs,  personal  representatives,  transferees,  successors,  and assigns
including any Trustee appointed by the Bankruptcy Court.

     (h) Severability.  If any provision of this Agreement or the application of
such  provision  to any  person  or  circumstance  shall  be held  invalid,  the
remainder of this  Agreement or the  application of such provision to persons or
circumstances,  other  than  those  to which it is held  invalid,  shall  not be
affected thereby.

     (i) Nonwaiver. The specified remedies to which Republic or Noxso may resort
under the terms of this  Agreement  are  cumulative  and are not  intended to be
exclusive of any other remedies or means of redress to which either party may be
lawfully  entitled in case of any breach or threatened breach by either party of
any provisions of this  Agreement.  The failure of either party to insist in any
one or more  instances  upon  the  strict  performance  of any of the  terms  or
conditions   of  this   Agreement   shall  not  be  construed  as  a  waiver  or
relinquishment for the future of such terms or conditions.


                                       13





     16. Counterparts.  This Agreement may be executed  simultaneously in two or
more counterparts,  each of which shall be deemed an original,  but all of which
together shall constitute one and the same instrument.

     17. Sales Tax. Any Tennessee or Pennsylvania sales, use or other intangible
tax arising out of the transaction contemplated herein shall be paid by Noxso.

     18. Broker's Fee. The parties  represent and agree that no broker or finder
has been  retained  other  than  Quirk,  Carson & Peppet.  Any  broker's  fee or
finder's fee in connection with this Agreement or the transactions  contemplated
hereby shall be paid by Noxso.

     19.  Press  Releases.  Neither  Noxso  nor  Republic  will  issue any press
releases  regarding  this  Agreement  prior to  Closing  without  prior  written
approval of the other.

     20. Department of Energy. Following the Closing,  Republic agrees (with the
consent of Olin) to grant the  Department of Energy  ("DOE"),  on a confidential
basis, access to the Facility and such operating data as set forth in Exhibit C.

     21.  Notices.  Any notice required or permitted to be given by either party
shall be deemed to be given when  received by  certified  mail,  return  receipt
requested or recognized overnight delivery service, charges paid, to the offices
of the parties as follows:

                                       14





                  (a)      If to Noxso:

                           Edwin J. Kilpela
                           Noxso Corporation
                           2414 Lytle Road
                           Bethel Park, PA 15102

                           with a copy to:

                           Joel M. Walker
                           Doepken Keevican & Weiss
                           58th Floor, USX Tower
                           600 Grant Street
                           Pittsburgh, PA 15219

                  (b)      If to Republic:

                           Steven Stemper
                           Republic Financial Corporation
                           3300 S. Parker Road, 5th Floor
                           Aurora, CO 80014

                           with a copy to:

                           Ellen A. Friedman
                           Murphy, Weir & Butler
                           101 California Street, 39th Floor
                           San Francisco, CA 94111



or at such other addresses as a party shall designate in writing.

                                       15








     IN WITNESS  WHEREOF,  the  parties  hereto  have  executed  or caused to be
executed this Agreement on the day and year first above written.


                                   REPUBLIC FINANCIAL CORPORATION



                                   By:  s/W. Randall Dietrich
                                        ------------------------------
                                          W. Randall Dietrich
                                         Senior Vice President


                                   NOXSO CORPORATION



                                   By:    s/Edwin J. Kilpela
                                        ------------------------------
                                   Name:    Edwin J. Kilpela
                                   Title: President and Chief Executive Officer

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