期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 14, 页码 7685-7696出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b01595
关键词
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资金
- National Science Foundation of China (NSFC) [21301107, 21373259, 21331001]
- Fundamental research funding of Shandong University [2014JC005]
- Taishan Scholar project of Shandong Province (China)
- Open Funding from State Key Laboratory of Material Processing and Die & Mold Technology at Huazhong University of Science and Technology [P2014-10]
- Hundred Talents project of the Chinese Academy of Sciences
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030102]
- U.S. Department of Energy [DE-AC02-06CH11357]
- Canadian Light Source
Mesoporous multimetal oxide microspheres (Ni-Ce-Al-O) with tuned and uniformly distributed composition are prepared through an aerosol-assisted self-assembly approach and further used as catalysts for ammonia decomposition. The as-prepared and spent materials are characterized by various techniques including ex situ/in situ X-ray diffraction (XRD), X-ray absorption fine structure (XAFS), scanning electron microscope (SEM)/transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and N-2-adsorption. The tricomponent Ni-Ce-Al-catalysts show great superiority over pure NiO or bicomponent catalysts (Ni-Ce-O and Ni-Al-O) in both catalytic activity and durability. By using H-2-TPR combined with in situ XRD, we have identified metallic Ni-0 as the active crystalline phase and further confirmed the strong interaction between alumina and other components. This strong interaction helps suppress the growth of both metallic Ni-0 as active site and ceria as promoter under the harsh catalytic conditions (high temperature and reducing atmosphere) and thus improves the activity and stability simultaneously.
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