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题名: Effect of acid treatment of zeolite on catalytic performance of Mo/HZSM-5 for methane dehydroaromatization
作者: Liu, HM;  Shen, WJ;  Liu, XM;  Bao, XH;  Xu, Y
关键词: molybdenum ;  HZSM-5 zeolite ;  methane ;  dehydroaromatization ;  acid treatment ;  dealumination
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2004-09-01
卷: 25, 期:9, 页:688-692
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The pretreatment with HNO3 solution was applied to modify HZSM-5 zeolite, and the Mo/EZSM-5 catalyst prepared by using the modified HZSM-5 zeolite as support showed higher stability in methane dehydroaromatization than that prepared by using unmodified HZSM-5 zeolite. Meanwhile, the formation of coke was distinctly suppressed on the Mo catalyst supported on the modified HZSM-5 zeolite. The effect of acid treatment on the structure of HZSM-5 zeolite and Mo/HZSM-5 catalyst was studied by SEM, XRD and H-1 MAS NMR techniques. The results suggested that the acid treatment of HZSM-5 led to an obvious dealumination and a decrease in the crystallinity of HZSM-5 zeolite. A part of Al species was extracted from the zeolite framework and formed extra-framework Al-OH groups, resulting in an evident decrease of the number of Bronsted acid sites remained on the zeolite surface. As demonstrated in the 1H MAS NMR experiment, the number of B acid sites per unit cell was 1.12 on the Mo/HZSM-5 catalyst prepared using unmodified zeolite as support, but it was only 0.88 on the Mo catalyst supported on modified HZSM-5 zeolite. The result indicated that too many B acid sites on the catalyst would cause severe coking and decrease the catalyst stability.
关键词[WOS]: NONOXIDATIVE CONDITIONS ;  DEHYDRO-AROMATIZATION ;  CONVERSION ;  ABSENCE ;  DEHYDROGENATION ;  BENZENE ;  OXYGEN ;  COKE
语种: 英语
WOS记录号: WOS:000224401400004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138441
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catal, Dalian 116023, Peoples R China

Recommended Citation:
Liu, HM,Shen, WJ,Liu, XM,et al. Effect of acid treatment of zeolite on catalytic performance of Mo/HZSM-5 for methane dehydroaromatization[J]. CHINESE JOURNAL OF CATALYSIS,2004,25(9):688-692.
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