Enhanced hydrothermal stability of high performance lean fuel combustion alumina-supported palladium catalyst modified by nickel

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• 作者：Ying Liu^a ; ^b ; Sheng Wang^a ; Tianjun Sun^a ; Diannan Gao^a ; Chunxi Zhang^a ; Shudong Wang^a ; ^{wangsd@dicp.ac.cn}
• 关键词：Ventilation air methane combustion ; Palladium ; NiAl2O4 spinel ; Lattice mismatch
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：30 May, 2012
• 卷：119-120
• 期：Complete
• 页码：321-328
• 文件大小：3390 K

摘要

The hydrothermal stability of Pd-based methane combustion catalyst was investigated under lean-fuel conditions, such as ventilation air methane. For the catalyst, the active component Pd was impregnated on Ni-modified alumina supports which were prepared by a modified method. The method was coupled with the conventional co-precipitation and hydrothermal synthesis process. A series of Pd catalysts and supports prepared, which had the Ni/Al ratios of 1:4, 1:2 and 1:1, were characterized by BET, CO-chemisorption, XRD, TPR, SEM and TEM. The relationship between active sites and supports was studied using HRTEM. In addition, the performances for lean methane combustion of all catalysts were studied. Results showed that the catalyst on well crystallized NiAl₂O₄ spinel support exhibited the superior hydrothermal stability. Methane conversion remained 96%after 3200 h at 873 K. Such excellent catalytic performance has been validated to relate to the stabilizing effect of support and the least lattice mismatch between NiAl₂O₄ and Pd, which contributed to high Pd dispersion.