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

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.

DOI

10.3906/kim-0809-34

Keywords

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

First Page

589

Last Page

598

Recommended Citation

GÜLYÜZ, B, AYDINOĞLU, Ş. Ö, AKSOYLU, A. E, & ÖNSAN, Z. İ (2009). Kinetics of CO oxidation over Pt-CeO_x supported on air-oxidized activated carbon. Turkish Journal of Chemistry 33 (5): 589-598. https://doi.org/10.3906/kim-0809-34