期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 297, 期 1, 页码 26-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2008.09.011
关键词
Nickel catalyst; Sol-gel preparation; Metal-support interaction; Steam reforming; Deactivation; Sintering; Coking; Carbon filament
资金
- Honda Research Institute, USA Inc
- National Science Foundation [0114098]
- Ohio Department of Development [342-0561, OCRC4-063-C3.31]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0114098] Funding Source: National Science Foundation
Propane steam reforming was studied over Ni-Al2O3 catalysts that were prepared by a conventional impregnation (IM) method and a one-step sol-gel (SG) technique. Both Ni-Al2O3 catalysts showed similar initial activity. However, IM-Ni-Al2O3 deactivated severely with time-on-stream of propane steam reforming. The catalyst prepared using a SG technique demonstrated stable catalytic performance. The two catalysts also showed major differences in product distribution, with SG catalyst giving much higher yields of hydrogen. Catalysts were characterized with temperature-programmed reduction (TPR), Xray photoelectron spectroscopy (XPS), temperature-programmed oxidation (TPO). transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. It was revealed that, with sol-gel preparation, highly dispersed small Ni crystallites are formed with a strong interaction with the support. This is shown to be important for coke suppression and catalyst stability. (C) 2008 Elsevier B.V. All rights reserved.
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