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科学通报  2014 

负载钙钛矿型催化剂的制备、结构及其对碳烟的催化燃烧性能

DOI: 10.1360/972013-1279, PP. 2609-2614

Keywords: 碳烟,催化燃烧,负载钙钛矿,氧化物载体,铈锆固溶体

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Abstract:

在应用较广的几种氧化物载体上采用共浸渍法制得系列负载钙钛矿型催化剂LaCoO3/MO(MO=CeO2,ZrO2,Al2O3,Ce0.8Zr0.2O2),热重分析(TG-DTA)方法评价了催化剂对碳烟的催化活性,并采用X射线衍射(XRD)、比表面积测试(BET)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)和H2程序升温还原(H2-TPR)方法对该系列催化剂的结构、形貌和氧化还原性能进行了表征.结果表明,各氧化物载体上负载的催化剂对碳烟的催化燃烧活性较体相钙钛矿均有明显提高,尤其是铈锆固溶体负载的钙钛矿型催化剂.一方面,负载催化剂更大的比表面积和多孔结构及形貌提高了碳烟与催化剂的接触效率;另一方面,钙钛矿活性组分负载后,其氧化还原性能得到了明显改善.

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