Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes

	Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes
	Zhang, WP ; Ma, D ; Han, XW ; Liu, XM ; Bao, XH ; Guo, XW ; Wang, XS
刊名	journal of catalysis
	1999-12-10
卷号	188 期号:2 页码:393-402
关键词	solid-state NMR Mo/HZSM-5 nanosized HZSM-5 zeolite methane activation probe molecule perfluorotributyl amine
英文摘要	the interaction between mo species and a conventionally microsized and particularly nanosized hzsm-5 support was studied by high-resolution multinuclear solid-state nmr techniques. as proved by al-27 and si-29 mas as well as cp/mas nmr investigations, this interaction was so strong that the framework aluminum of both microsized and nanosized hzsm-5 zeolites could be extracted. with increasing mo loading, more nonframework aluminum, resonanced at ca. 30 ppm, appeared in the al-27 mas nmr spectrum of the mo-loaded nanosized hzsm-5 catalyst. meanwhile, this strong interaction led to the formation of more new al-2(moo4)(3) crystallines on the nanosized hzsm-5 support than on the microsized hzsm-5 support. the appearance of al-2(moo4)(3) crystallines resulted in fewer active catalysts for the methane dehyro-aromatization. the results of h-1 mas nmr using perfluorotributyl amine as a probe molecule demonstrated that mo species preferentially reacted with the silanols and nonframework aloh on the external surface of microsized and nanosized hzsm-5 zeolites. in addition, impregnated mo species remained predominantly on the external surface of the nanosized hzsm-5 zeolite, although there was a possibility that they might migrate into the lattice channels of the microsized hzsm-5 zeolite. the migration of some mo species into the zeolite channels might be beneficial for the conversion of methane to aromatics in the absence of oxygen. (c) 1999 academic press.
WOS标题词	science & technology ; physical sciences ; technology
类目[WOS]	chemistry, physical ; engineering, chemical
研究领域[WOS]	chemistry ; engineering
关键词[WOS]	h-1-al-27 cross-polarization ; nuclear-magnetic-resonance ; resolution al-27 nmr ; ion zsm-5 zeolites ; acid sites ; bronsted-acid ; mas nmr ; catalysts ; conversion ; benzene
收录类别	SCI
语种	英语
WOS记录号	WOS:000084292500017
公开日期	2015-11-10
内容类型	期刊论文
源URL	[http://159.226.238.44/handle/321008/138549]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China 2.Dalian Univ Technol, Lab Comprehens Utilizat Carbonaceous Resources, Dalian 116012, Peoples R China
推荐引用方式 GB/T 7714	Zhang, WP,Ma, D,Han, XW,et al. Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes[J]. journal of catalysis,1999,188(2):393-402.
APA	Zhang, WP.,Ma, D.,Han, XW.,Liu, XM.,Bao, XH.,...&Wang, XS.(1999).Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes.journal of catalysis,188(2),393-402.
MLA	Zhang, WP,et al."Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes".journal of catalysis 188.2(1999):393-402.