个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 大连理工大学成都研究院院长
性别:男
毕业院校:中科院大连化学物理研究所
学位:博士
所在单位:化工学院
学科:化学工艺. 物理化学. 功能材料化学与化工
办公地点:大连理工大学西部校区化工综合楼A401室
联系方式:辽宁省大连市高新区凌工路2号,邮编116024
电子邮箱:changhai@dlut.edu.cn
Silicon-nickel intermetallic compounds supported on silica as a highly efficient catalyst for CO methanation
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论文类型:期刊论文
发表时间:2014-01-01
发表刊物:CATALYSIS SCIENCE & TECHNOLOGY
收录刊物:SCIE、EI、Scopus
卷号:4
期号:1
页面范围:53-61
ISSN号:2044-4753
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.