锰铈相互作用对催化碳烟燃烧性能的影响

摘要

采用等体积浸渍法制备HZSM-5分子筛负载Mn（9Mn/Z），Ce（9Ce/Z）和同时负载Mn、Ce（4.5Mn4.5Ce/Z）催化剂，并考察了它们的催化碳烟颗粒燃烧的性能。结果表明，同时负载Mn、Ce的催化剂（4.5Mn4.5Ce/Z）具有更好的催化碳烟燃烧的活性，碳烟转化率为50%时所对应的温度（T₅₀）为400℃，低于9Mn/Z（T₅₀=414℃）和9Ce/Z（T₅₀=447℃）催化剂。相比于纯碳烟的燃烧，T₅₀降低了128℃。通过氢气程序升温还原（H₂-TPR）测试，相比较催化剂9Mn/Z和9Ce/Z，催化剂4.5Mn4.5Ce/Z中混合氧化物的氢气的还原温度向低温方向产生了偏移，具有更好的氧化还原性，说明MnO_x和CeO₂产生了一定的相互作用；X射线光电子能谱（XPS）测试表明，样品4.5Mn4.5Ce/Z具有更多的表面化学吸附氧物种，这些氧物种有助于碳烟氧化燃烧，因而表现出较高的催化碳烟燃烧活性。

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	王磊
	曹春梅
	邢令利
	孟明
	李新刚

关键词：分子筛； MnO_x-CeO₂；相互作用；表面化学吸附氧；碳烟燃烧

Abstract：

The catalysts of HZSM-5 zeolite loading manganese (9Mn/Z), cerium (9Ce/Z) and manganese-cerium (4.5Mn4.5Ce/Z) were prepared by incipient wetness impregnation method. The catalytic activities of these catalysts were investigated for soot combustion. The results show that the (4.5Mn4.5Ce/Z) catalyst has higher catalytic activity of soot combustion and the temperature of soot conversion 50% (T₅₀)is 400℃. It is lower than that of 9Mn/Z (T₅₀=414℃) and 9Ce/Z (T₅₀=447℃) catalysts, and decreases by 128℃ compared with the pure soot combustion. The hydrogen temperature programmed reduction (H₂-TPR) results show that the hydrogen reduction peak of MnO_x-CeO₂ in the catalyst 4.5Mn4.5Ce/Z shifts toward lower temperatures compared with the catalyst (9Mn/Z) and 9Ce/Z, suggesting its better redox properties with the strong interaction between the MnO_x and CeO₂. The X-ray photoelectron spectroscopy (XPS) results show that the 4.5Mn4.5Ce/Z catalyst possesses more chemisorbed oxygen species. It should be conducive to the soot oxidation reaction. Thus, the 4.5Mn4.5Ce/Z catalyst performs higher soot combustion catalytic activity.

Keywords： zeolite； MnO_x-CeO₂； interaction； chemisorbed oxygen species； soot combustion

Received 2016-04-11;

Corresponding Authors: 李新刚,E-mail:xingang_li@tju.edu.cn Email: xingang_li@tju.edu.cn

About author: 王磊(1990-),男,硕士研究生,现从事环境催化方面的研究。

引用本文:

王磊, 曹春梅, 邢令利, 孟明, 李新刚.锰铈相互作用对催化碳烟燃烧性能的影响[J]. 化学工业与工程, 2018,35(4): 32-37,45

Wang Lei, Cao Chunmei, Xing Lingli, Meng Ming, Li Xingang.The Effect of Manganese/Cerium Interactions in Catalytic Soot Combustion[J]. Chemcial Industry and Engineering, 2018,35(4): 32-37,45

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