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Effect of acid treatment of zeolite on catalytic performance of Mo/HZSM-5 for methane dehydroaromatization
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
2004-09-01
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
关键词[WOS]NONOXIDATIVE CONDITIONS ; DEHYDRO-AROMATIZATION ; CONVERSION ; ABSENCE ; DEHYDROGENATION ; BENZENE ; OXYGEN ; COKE
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.
语种英语
WOS记录号WOS:000224401400004
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/138441
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catal, Dalian 116023, Peoples R China
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GB/T 7714
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.
APA Liu, HM,Shen, WJ,Liu, XM,Bao, XH,&Xu, Y.(2004).Effect of acid treatment of zeolite on catalytic performance of Mo/HZSM-5 for methane dehydroaromatization.CHINESE JOURNAL OF CATALYSIS,25(9),688-692.
MLA Liu, HM,et al."Effect of acid treatment of zeolite on catalytic performance of Mo/HZSM-5 for methane dehydroaromatization".CHINESE JOURNAL OF CATALYSIS 25.9(2004):688-692.
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