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

Literature Information

Publication Date 2010-06-03
DOI 10.1039/B922046A
Impact Factor 3.676
Authors

Cheralathan Kanakkampalayam Krishnan, Keiko Nakamura, Hirohito Hirata, Masaru Ogura


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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.

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