Kinetics of CO oxidation over Pt-CeO_x supported on air-oxidized activated carbon

Authors

BERRİN GÜLYÜZ
ŞEYMA ÖZKARA AYDINOĞLU
AHMET ERHAN AKSOYLU
ZEYNEP İLSEN ÖNSAN

DOI

10.3906/kim-0809-34

Abstract

Kinetics of low-temperature CO oxidation was studied under atmospheric pressure at 383 K in the initial rates region over 1wt%Pt-1wt%CeO_x supported on air-oxidized activated carbon (AC2). Feed concentrations of 1-5 mol% CO and 1-2.5 mol% O_2 with balance He were used for CO oxidation in the absence of hydrogen. A simple power-function rate expression was obtained with reaction orders of -0.24 in CO and 0.98 in O_2, and a plausible LHHW expression compatible with mechanisms reported in the literature was proposed. Feed concentrations of 5 mol% CO and 2.5 mol% O_2 were used for investigating the effect of the presence of CO_2 or H_2 on CO oxidation rates by partially replacing inert He with 2-4 mol% CO_2 or 10-60 mol% H_2.

Keywords

Carbon monoxide, oxidation, kinetics, Pt-ceria catalysts, activated carbon supports, PROX.

First Page

589

Last Page

598

Recommended Citation

GÜLYÜZ, BERRİN; AYDINOĞLU, ŞEYMA ÖZKARA; AKSOYLU, AHMET ERHAN; and ÖNSAN, ZEYNEP İLSEN (2009) "Kinetics of CO oxidation over Pt-CeO_x supported on air-oxidized activated carbon," Turkish Journal of Chemistry: Vol. 33: No. 5, Article 3. https://doi.org/10.3906/kim-0809-34
Available at: https://journals.tubitak.gov.tr/chem/vol33/iss5/3