Pretreatment effect on copper-titanium dioxide catalysts in CO oxidation
Guoqiang Cao, Nan Yi
Abstract
Copper‑titanium dioxide (Cu-TiO2) catalysts are pretreated with hydrogen‑helium and oxygen‑helium before evaluation of the carbon monoxide oxidation. Pre-reduced Cu-TiO2 catalysts showed higher initial and overall activity than pre-oxidized Cu-TiO2 catalysts. H2-TPR results revealed that copper species are dispersed differently after pre-reduction and pre-oxidation treatments. XPS results confirmed that Cu+ and Cu2+ species exist for both treatments. Meanwhile, IR results suggested Cu+ species promote the absorption of CO, leading to increased reaction rates.
Topics & Concepts
CatalysisCopperCarbon monoxideTitanium dioxideCarbon dioxideInorganic chemistryChemistryTitaniumOxygenHydrogenX-ray photoelectron spectroscopyMaterials scienceChemical engineeringMetallurgyOrganic chemistryEngineeringCatalytic Processes in Materials ScienceCatalysis and Oxidation ReactionsCatalysts for Methane Reforming