期刊
AICHE JOURNAL
卷 61, 期 12, 页码 4323-4331出版社
WILEY-BLACKWELL
DOI: 10.1002/aic.14935
关键词
heterogeneous catalysis; structured catalyst; methanation; foam; computational fluid dynamics simulation
资金
- ''973 program'' from MOST of China [2011CB201403]
- NSF of China [21473057, 21273075, U1462129]
Monolithic Ni-Al2O3/Ni-foam catalyst is developed by modified wet chemical etching of Ni-foam, being highly active/selective and stable in strongly exothermic CO2 methanation process. The as-prepared catalysts are characterized by x-ray diffraction scanning electron microscopy, inductively coupled plasma atomic emission spectrometry, and H-2-temperature programmed reduction-mass spectrometry. The results indicate that modified wet chemical etching method is working efficiently for one-step creating and firmly embedding NiO-Al2O3 composite catalyst layer (approximate to 2 m) into the Ni-foam struts. High CO2 conversion of 90% and high CH4 selectivity of >99.9% can be obtained and maintained for a feed of H-2/CO2 (molar ratio of 4/1) at 320 degrees C and 0.1 MPa with a gas hourly space velocity of 5000 h(-1), throughout entire 1200 h test over 10.2 mL such monolithic catalysts. Computational fluid dynamics calculation and experimental measurement consistently confirm a dramatic reduction of hotspot temperature due to enhanced heat transfer. (c) 2015 American Institute of Chemical Engineers
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