Silicon-nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation

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	Silicon-nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation
	X. Chen; J. H. Jin; G. Y. Sha; C. Li; B. S. Zhang; D. S. Su; C. T. Williams; C. H. Liang
	2014
发表期刊	Catalysis Science & Technology
ISSN	2044-4753
卷号	4 期号:1 页码:53-61
摘要	Silicon-nickel intermetallic compounds (IMCs) supported on silica (Si-Ni/SiO2), as a highly efficient catalyst for CO methanation, have been prepared by direct silicification of Ni/SiO2 with silane at relatively low temperature in a fluidized bed reactor. The as-prepared materials were characterized by X-ray diffraction, transmission electron microscopy, in situ FT-IR of CO adsorption, and H-2-temperature programmed reduction-mass spectrometry (TPR-MS) of CO. The results indicate that uniform NiSix nanoparticles with about 3-4 nm are evenly dispersed on silica. The combined in situ FTIR and TPR-MS results suggest that the Si-Ni/SiO2 catalysts afforded high activity in CO methanation, promoting the formation of CH4 at ca. 240 degrees C. The catalytic hydrogenation of CO on Si-Ni/SiO2 was investigated in a fixed-bed reactor at GHSVs 48 000 mL h(-1) g(-1) under 1 atm in the temperature interval 200-600 degrees C. In the higher temperature reaction region (500-600 degrees C), it is notable that the Si-Ni/SiO2 catalysts present high activity for CO methanation as compared to the Ni/SiO2 catalyst. More importantly, the Si-Ni/SiO2-350 catalyst containing thermally stabile Si-Ni IMCs shows significantly higher resistance to the sintering of Ni particles. Raman characterization of the spent materials qualitatively shows that carbon deposition observed on the conventional Ni/SiO2 catalyst is much higher than that of the used Si-Ni/SiO2-350. It is proposed that small amounts of silicon interacting with Ni atoms selectively prevent the adsorption of resilient carbon species.
部门归属	[chen, xiao ; jin, jianhui ; sha, guangyan ; li, chuang ; liang, changhai] dalian univ technol, sch chem engn, lab adv mat & catalyt engn, dalian 116024, peoples r china. [zhang, bingsen ; su, dangsheng] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [williams, christopher t.] univ s carolina, swearingen engn ctr, dept chem engn, columbia, sc 29208 usa. ; chen, x (reprint author), dalian univ technol, sch chem engn, lab adv mat & catalyt engn, dalian 116024, peoples r china. ; willia84@cec.sc.edu ; changhai@dlut.edu.cn
关键词	Hydrogenation Reactions Raman-spectroscopy Natural-gas Temperature Adsorption Ni/al2o3 Biomass Phenylacetylene Hydrocarbons Selectivity
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72415
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Chen,J. H. Jin,G. Y. Sha,et al. Silicon-nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation[J]. Catalysis Science & Technology,2014,4(1):53-61.
APA	X. Chen.,J. H. Jin.,G. Y. Sha.,C. Li.,B. S. Zhang.,...&C. H. Liang.(2014).Silicon-nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation.Catalysis Science & Technology,4(1),53-61.
MLA	X. Chen,et al."Silicon-nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation".Catalysis Science & Technology 4.1(2014):53-61.