Abstract
The catalytic behavior of hydrogen-reduced copper loaded ZnO, SiO2, and TiO2 has been investigated for diesel particulate matter(PM) oxidation. 5 %Cu/ZnO showed a strong diesel PM oxidation activity at 150 °C. XPS spectroscopy was utilized to study the electronic states of Cu in Cu/ZnO catalyst. Presence of Cu1+ ions at the surface of the catalyst even after its use in PM oxidation cycles was assigned responsible for its high catalytic performance. The high stability of Cu1+ is explained on basis of the isoelectronic interactions of Cu1+ (3d10) with Zn2+ (3d10) at the Cu2O–ZnO interface. Cu/SiO2 and Cu/TiO2 were not active for this reaction probably due to the absence of Cu1+ which could not be stabilized by Ti4+ or Si4+. Results indicate that 5 %Cu/ZnO catalyst can be utilized for the abatement of diesel engine emissions even from the starting point of cold engines.
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