Photocatalytic CO oxidation with water over Pt/TiO2 catalysts

Krzysztof Czupryn,Jacek Rynkowski,Ireneusz Kocemba

doi:10.1007/s11144-017-1334-4

Krzysztof Czupryn, Jacek Rynkowski + Show 1 more

Open Access

https://doi.org/10.1007/s11144-017-1334-4

Copy DOI

Abstract

This paper reports that Pt/TiO2 and to some extent, Pt/Al2O3 and Pt/SiO2 catalysts show some activity in the photocatalytic oxidation of CO by water at low temperature (< 100 °C) in the absence of oxygen. For Pt/TiO2 catalysts, CO conversion is dependent on the Pt loading as well as the temperature of their reduction. There are an optimal platinum loading (5 wt%) and catalyst reduction temperature (500 °C) ensuring the best photocatalytic efficiency. Catalytic performance results from the combined effects of electron–hole photogeneration and partial photodesorption of CO from the platinum surface, followed by the adsorption and subsequent dissociation of H2O. The probable mechanism of photooxidation of CO by H2O was proposed.

Highlights

This paper reports that Pt/TiO2 and to some extent, Pt/Al2O3 and Pt/SiO2 catalysts show some activity in the photocatalytic oxidation of CO by water at low temperature (\ 100 °C) in the absence of oxygen
Catalytic CO oxidation by oxygen is an important reaction for the removal of air pollution
Temperature-programmed reduction (TPR) and chemisorption studies were carried out in the apparatus PEAK—4 described in detail in [21]

Summary

Introduction

Catalytic CO oxidation by oxygen is an important reaction for the removal of air pollution. CO abatement is necessary because this extremely toxic, color-, odor- and tasteless gas presents a mortal threat to human and animal health. The catalytic oxidation of CO has been studied on numerous both metallic and oxide catalysts over the years [1,2,3,4,5,6,7]. The mixture of copper and manganese oxides (hopcalite) or gold deposited on some metal oxides exhibits very high activity towards the lowtemperature oxidation of CO [8, 9]. It is worth mentioning that despite the toxicity of CO for multicellular organisms, some bacteria use it as a source of energy.

Methods

Results

Conclusion