Structure Driven Tuning of the Catalytic Performance of PtCe-Modified Zeolite ZSM-5 in the CO Oxidation

Shilina, M.; Krotova, I.; Maslakov, K.; Petrova, S.; Udalova, O.; Rostovshchikova, T.

Авторы: Shilina Marina, Krotova Irina, Maslakov Konstantin, Petrova Stanislava, Udalova Olga, Rostovshchikova Tatiana
Журнал: Molecules
Том: 31
Номер: 1
Год издания: 2026
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 1
Последняя страница: 18
Номер статьи: 156
DOI: 10.3390/molecules31010156
Аннотация: The catalytic oxidation of CO is of great technological importance for the treatment ofvehicle and industrial exhaust gases. PtCe-catalysts of low-temperature CO oxidation wereprepared by the impregnation of ZSM-5 zeolite (Z) with aqueous solutions of H2PtCl6 andCe(NO3)3, varying the order of metal deposition and thermal treatment conditions. The relationships between structure transformations and catalyst performance were established based on the SEM, TEM, EDX, DRIFT, and X-ray photoelectron spectroscopies data. For the Ce/Pt/Z sample, in which cerium was deposited after platinum, the 100% CO conversiontemperature was only 120 ◦C. The inverse deposition sequence of metals (Pt/Ce/Z catalyst) resulted in CO oxidation at a higher temperature that can be decreased to 110 ◦C by redox treatment. The prepared catalysts were also active in the CO oxidation in excess hydrogen (PROX) but were not selective enough. However, the activity of PtCe-modified ZSM-5 enhanced greatly in the repeated cycles of CO oxidation (TOX) after testing in PROX. It is suggested that enhancing the interaction between Pt and Ce is a key factor in tuning thecatalyst performance. The 0.2 wt.% Pt catalysts showed the best performance and providedcomplete CO conversion at 95 ◦C, which is a pronounced result for low-loaded Pt catalysts.
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