Effect of Different Supports on Physical and Chemical Properties and Catalytic Activity over Ba-Ru /MgO Ammonia Synthesis Catalysts

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	Effect of Different Supports on Physical and Chemical Properties and Catalytic Activity over Ba-Ru /MgO Ammonia Synthesis Catalysts
	Xia CG(夏春谷); Xiong XM(熊绪茂); Mu XY(慕新元); Hu B(胡斌); Yang XL(杨晓龙); Tang LP(唐立平)
刊名	分子催化
	2012
卷号	26 期号:1 页码:1-9
关键词	ammonia synthesis ruthenium catalyst precipitants basic site 氨合成钌催化剂沉淀剂碱性位
ISSN号	1001-3555
通讯作者	胡斌
中文摘要	MgO supports were prepared by different precipitants and further examined as the supports for barium-promoted ruthenium catalyst for ammonia synthesis．The reason resulting in their difference of catalytic activity were explored by X-ray diffraction，N2 adsorption-desorption，X-ray fluorescence spectroscopy，transmission electron microscopy，H2 temperature-programmed reduction，CO2 temperature-programmed desorption，H2 temperature-programmed desorption and N2 temperature-programmed desorption．It was found that MgO prepared by (NH4)2CO3 precipitant facilitated the reduction of ruthenium oxide for Ba-Ru/MgO catalyst，and the weak basic sites of Ba-Ru/MgO (NH4)2CO3 as precipitant) appeared at lower temperature and showed higher weak basic site densities compared with the others． At 450 ℃、5.0 MPa and 5 000 h-1，catalytic activity of Ba-Ru/MgO catalyst employing (NH4)2 CO3 as the precipitant was higher than that of the catalyst prepared by other precipitants under the same reaction conditions，the ammonia concentration in the effluent reached 3.74%． The addition of Ba promoter significantly decreased the amount of hydrogen chemisorption，increased the number of dissociatively adsorbed N* on the Ru surface and thus accelerated the reaction rate of ammonia synthesis．
学科主题	物理化学
收录类别	CSCD
资助信息	the National Science Foundation for Distinguished Young Scholars of China (20625308)
语种	英语
公开日期	2013-10-11
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/3926]
专题	兰州化学物理研究所_OSSO国家重点实验室
通讯作者	Hu B(胡斌)
推荐引用方式 GB/T 7714	Xia CG,Xiong XM,Mu XY,et al. Effect of Different Supports on Physical and Chemical Properties and Catalytic Activity over Ba-Ru /MgO Ammonia Synthesis Catalysts[J]. 分子催化,2012,26(1):1-9.
APA	夏春谷,熊绪茂,慕新元,胡斌,杨晓龙,&唐立平.(2012).Effect of Different Supports on Physical and Chemical Properties and Catalytic Activity over Ba-Ru /MgO Ammonia Synthesis Catalysts.分子催化,26(1),1-9.
MLA	夏春谷,et al."Effect of Different Supports on Physical and Chemical Properties and Catalytic Activity over Ba-Ru /MgO Ammonia Synthesis Catalysts".分子催化 26.1(2012):1-9.