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OALib Journal期刊
ISSN: 2333-9721
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MnOx负载量对MnOx/Ce0.7Zr0.2La0.1O2-Al2O3催化剂上碳烟燃烧性能的影响
DOI: 10.3724/SP.J.1088.2012.20746, PP. 1965-1973
Keywords: 锰氧化物,负载量,碳烟,催化燃烧,氧化铈,氧化锆,氧化镧,氧化铝
Abstract:
？采用等体积浸渍法制备了一系列不同MnOx含量的MnOx/Ce0.7Zr0.2La0.1O2-Al2O3(Ce0.7Zr0.2La0.1O2/Al2O3质量比=1)催化剂,并用X射线衍射、低温N2吸附-脱附、X射线光电子能谱、O2程序升温脱附和H2程序升温还原等手段对催化剂进行了表征,考察了催化剂催化柴油车排放碳烟颗粒物燃烧的反应性能.结果表明,催化剂表面吸附的活性氧物种和MnOx的低温区还原性能是决定催化剂活性的两大关键因素.当MnOx负载量为5%时,催化反应所需的活性氧减少,因而活性降低;但MnOx负载量增至10%时,催化剂中Mn物种的可还原量提高,从而增加其活性;增至20%时,MnOx与表面吸附氧物种的可还原量间达平衡最佳值,活性最佳,碳烟起燃温度比无催化剂时降低了179oC;负载量达30%后,由于载体表面吸附氧物种数量的降低和还原峰温的上升使催化剂活性下降.
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