Issue 27, 2010

Pt/CeO2–ZrO2 present in the mesopores of SBA-15—a better catalyst for COoxidation

Abstract

Platinum loaded CeO2–ZrO2/SBA-15 composite material catalyzes CO oxidation at lower temperatures (<100 °C) than conventionally prepared Pt/CeO2–ZrO2 (>150 °C). A sequence of reduction and reoxidation of CeO2- and ZrO2-loaded samples promotes the formation of CeO2–ZrO2 solid solution on the siliceous surface as indicated by wide-angle X-ray diffraction (XRD) patterns. Furthermore, initial coating of ZrO2 on the silica walls is quite important before CeO2–ZrO2 loading in order to obtain the CeO2–ZrO2 solid solution. The presence of CeO2–ZrO2 particles inside the mesopores is confirmed by N2 adsorption, low-angle X-ray diffraction, and scanning transmission electron microscopy (STEM) images. The solid solution of CeO2–ZrO2 in the confined mesoporous space forms more Ce3+ centers associated with oxygen vacancies on the surface due to the smaller size of the dispersed particles and these Ce3+ centers are believed to be responsible for the higher catalytic activity.

Graphical abstract: Pt/CeO2–ZrO2 present in the mesopores of SBA-15—a better catalyst for CO oxidation

Supplementary files

Article information

Article type
Paper
Submitted
21 Oct 2009
Accepted
29 Mar 2010
First published
03 Jun 2010

Phys. Chem. Chem. Phys., 2010,12, 7513-7520

Pt/CeO2–ZrO2 present in the mesopores of SBA-15—a better catalyst for CO oxidation

C. Kanakkampalayam Krishnan, K. Nakamura, H. Hirata and M. Ogura, Phys. Chem. Chem. Phys., 2010, 12, 7513 DOI: 10.1039/B922046A

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