MgO/h-BN复合载体对Ba-Ru/MgO/h-BN氨合成催化剂性能的影响(英文)

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	MgO/h-BN复合载体对Ba-Ru/MgO/h-BN氨合成催化剂性能的影响(英文)
	杨晓龙1,2 ; 唐立平1,2 ; 夏春谷1 ; 熊绪茂1 ; 慕新元1 ; 胡斌1
刊名	Chinese Journal of Catalysis
	2012
卷号	33 期号:3 页码:447-453
关键词	ammonia synthesis ruthenium catalyst magnesia hexagonal boron nitride basicity 氨合成钌催化剂氧化镁六方氮化硼碱性
ISSN号	0253-9837
通讯作者	胡斌
中文摘要	采用浸渍法制备了系列不同质量比的MgO/h-BN复合载体负载的Ru基氨合成催化剂, 采用X射线衍射、N₂低温物理吸附、X射线荧光、扫描电镜、透射电镜、程序升温分析等手段对催化剂进行了详细的表征,并在固定床反应器上考察了它们在氨合成反应中的催化性能. 结果表明, MgO/h-BN复合载体中h-BN含量对催化剂活性的影响较大, Ba-Ru[1:1](摩尔比)/MgO/h-BN[8:2](质量比),Ba-Ru[1:1]/MgO/h-BN[6:4]和Ba-Ru[1:1]/MgO/h-BN[5:5]催化剂上氨合成活性均高于Ba-Ru/MgO催化剂.在425 °C, 5.0 MPa, N₂/H₂=1/3和5000 h^-1条件下, Ba-Ru[1:1]/MgO/h-BN[8:2]表现出最优催化活性, 达506.9 ml/(gcat·h). 这可归因于MgO/h-BN复合载体上存在较高数量的碱性位, 特别是弱碱性位和中等强度碱性位, 而这些碱性位可能是由MgO和h-BN之间的相互作用造成.
英文摘要	A series of MgO/hexagonal boron nitride (h-BN) composite with different mass ratio were synthesized by impregnation method and used as supports for ruthenium catalysts in ammonia synthesis reaction. The catalysts were characterized by X-ray diffraction, N₂ physical adsorption, X-ray fluorescent spectrometer, scanning electron microscope, transmission electron microscope, temperature programmed reduction of H₂, and temperature programmed desorption of CO₂ (CO₂-TPD). The activity measurements of ammonia synthesis were carried out in a fixed-bed flow reactor with a mixture of N₂ and H₂ atomsphere under steady-state conditions (5.0 MPa, 350-500 °C, 5000 h^-1). The results showed that the rate of ammonia formation was strongly influenced by the h-BN content used in the catalysts preparation process. The Ba-Ru[1:1] (molar ratio of Ba to Ru = 1:1)/MgO/h-BN[8:2] (weight ratio of MgO to h-BN = 8:2), Ba-Ru[1:1]/MgO/h-BN[6:4] and Ba-Ru[1:1]/MgO/h-BN[5:5] catalysts exhibited higher activity than Ba-promoted Ru/MgO catalyst. At 425 °C, 5.0 MPa, flow rate of 5000 h^-1, and a N₂/H₂ = 1/3 atmosphere, the optimum activity of 506.9 ml/(g(cat).h) was achieved when MgO/h-BN[8:2] was used as the catalytic support. The execllent activity was mainly attributed to the basicity of the MgO/h-BN combination-type support, especially "weak" and "medium" basic sites. Large numbers of basic sites were observed from CO₂-TPD characterization due to the interaction between MgO and the h-BN material
学科主题	物理化学与绿色催化
收录类别	SCI
资助信息	国家自然科学基金(20576025);国家杰出青年科学基金(20625308)
语种	英语
WOS记录号	WOS:000302114300010
公开日期	2013-10-11
内容类型	期刊论文
源URL	[http://210.77.64.217/handle/362003/3904]
专题	兰州化学物理研究所_OSSO国家重点实验室
作者单位	1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Gansu, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	杨晓龙,唐立平,夏春谷,等. MgO/h-BN复合载体对Ba-Ru/MgO/h-BN氨合成催化剂性能的影响(英文)[J]. Chinese Journal of Catalysis,2012,33(3):447-453.
APA	杨晓龙,唐立平,夏春谷,熊绪茂,慕新元,&胡斌.(2012).MgO/h-BN复合载体对Ba-Ru/MgO/h-BN氨合成催化剂性能的影响(英文).Chinese Journal of Catalysis,33(3),447-453.
MLA	杨晓龙,et al."MgO/h-BN复合载体对Ba-Ru/MgO/h-BN氨合成催化剂性能的影响(英文)".Chinese Journal of Catalysis 33.3(2012):447-453.