Ex. 24.1
POWER OF ATTORNEY
The undersigned hereby constitutes and appoints Joseph S. Koscinski
with full power of substitution, as the undersigned's true and lawful attorney-
in-fact to:
(1) prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S. Securities and
Exchange Commission (the "SEC") a Form ID, including amendments
thereto, and any other documents necessary or appropriate to
obtain codes and passwords enabling the undersigned to make
electronic filings with the SEC of reports required by Section
16(a) of the Securities Exchange Act of 1934, as amended, or any
rule or regulation of the SEC;
(2) execute for and on behalf of the undersigned, in the
undersigned's capacity as officer and/or director of Ecovyst
Inc. (the "Company"), Forms 3, 4, and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934, as
amended, and the rules thereunder;
(3) do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to complete and
execute any such Form 3, 4, or 5, complete and execute any
amendment or amendments thereto, and timely file such form with
the SEC and any stock exchange or similar authority; and
(4) take any other action of any type whatsoever in connection with
the foregoing that, in the opinion of such attorney-in-fact, may
be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents
executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.
The undersigned hereby grants to such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might
or could do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact's substitute or substitutes, shall lawfully do or cause
to be done by virtue of this power of attorney and the rights and powers herein
granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934, as amended.
This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities issued by the Company,
unless earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorney-in-fact.
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IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of the 27th day of April, 2022.
/s/ Bryan K. Brown
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Bryan K. Brown
[Signature Page to Limited Power of Attorney]
