Oxygen Storage Capacity of Pt-, Pd-, Rh/CeO_2-Based Oxide Catalyst

李凯; 王学中; 周泽兴; 吴晓东; 翁端

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Oxygen Storage Capacity of Pt-, Pd-, Rh/CeO_2-Based Oxide Catalyst

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CZO (CeO2-ZrO2) and CZYO (CeO2-ZrO2-Y2O3) series of mixed oxides were prepared by coprecipitaion, and a part of these oxides were loaded with precious metals (PM). XRD, BET, and oxygen storage capacity (OSC) investigations were performed on samples aged at 750, 900, and 1050 ℃. It was observed that BET surface area and OSC showed a marked decrease in CeO2 aged at high temperature, and the crystallite size showed an obvious increase. The CZO samples consist of cubic- and tetragonal crystal phases, and their crystallite size increase rapidly when aged at high temperature. The CZYO samples consist of single crystal phase when the content of Y exceeds 0.15 mol, and their crystallite size increases slowly during high-temperature aging. It is concluded that additive Y can stabilize the performance of CZYO oxides. In the aged CZO and CZYO mixed-oxide systems, addition of a small amount of precious metals (Pt, Pd, Rh) increased the rate of reduction and led to an obvious improvement in OSC. OSC of CZO and CZYO with precious metals are related to their composition and the type of precious metal.

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《中国稀土学报：英文版》 |2007年第1期|6-10|共5页
作者
李凯; 王学中; 周泽兴; 吴晓东; 翁端;
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作者单位

Laboratory of Advanced Materials;

Department of Materials Science and Engineering;

Tsinghua University;

Beijing 100084;

China;

Chinese Research Academy of Environmental Sciences;

Beijing 100012;

China;

Chinese Research Academy of Environmental Sciences;

Beijing 100012;

China;

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原文格式 PDF
正文语种 chi
中图分类催化;第Ⅲ族金属元素及其化合物;
关键词
二氧化铈; 氧催化剂; 氧含量; 铂; 钯; 铑;

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5. Synthesis and Property of Low Loaded Pt Alloy Catalysts for Oxygen Reduction [A] . Tom ROBERT . 2015

Oxygen Storage Capacity of Pt-, Pd-, Rh/CeO_2-Based Oxide Catalyst

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