Porous stainless-steel fibers supported CuCeFeOx/Zeolite catalysts for the enhanced CO oxidation: Experimental and kinetic studies

To develop novel catalysts of high-performance and cost-effectiveness, and to investigate the reaction kinetics of CO oxidation, ternary CuCeFeOx catalysts supported on zeolite/PSF (porous stainless-steel fibers) were synthe-sized for the first time. Effects of different Ce/Fe ratios, loading amounts, calcination temperatures, and reaction kinetics were investigated. Remarkably improved catalytic performance was achieved in the PSF-supported catalysts compared to the granular ones, owing to the increased mass/heat transfer efficiency and the high dispersion of active metal oxide species anchored on the zeolite layer. The Cu3Ce12Fe4-400 sample exhibited the best catalytic activity with a temperature difference in T-90 of almost 40 degrees C lower than the worst one. Charac-terization results from XRD, FTIR, TEM, XPS, H-2-TPR, etc. revealed that the promoted reducibility of metal oxides and formation of more oxygen vacancies significantly contributed to the enhanced catalytic activity. Furthermore, a generalized rate expression was derived from intrinsic and macro kinetic studies by assuming the conversion of CO to CO2 as the rate-determining step, in which CO oxidation over the PSF-supported catalysts followed the pseudo-first-order kinetic established by the Langmuir-Hinshelwood type mechanism.

Automated summary

In this study, ternary CuCeFeOx catalysts supported on zeolite/PSF were synthesized for the first time to develop high-performance and cost-effective catalysts and investigate the kinetics of CO oxidation. The PSF-supported catalysts showed significantly improved catalytic performance compared to granular catalysts, attributed to increased mass/heat transfer efficiency and high dispersion of active metal oxide species. Characterization results revealed that the enhanced catalytic activity was due to increased reducibility of metal oxides and formation of more oxygen vacancies. Kinetic studies suggested that CO oxidation over the PSF-supported catalysts followed a pseudo-first-order kinetic mechanism.