无胺法合成高硅丝光沸石的表征

doi:10.3866/PKU.WHXB20060214

CORC > 北京大学 > 化学与分子工程学院

	无胺法合成高硅丝光沸石的表征; Characterization of high silica mordenite synthesized from amine-free system using fluoride as structure-directing agent
	祁晓岚 ; 王战 ; 李士杰 ; 李斌 ; 刘希尧 ; 林炳雄
刊名	物理化学学报
	2006
关键词	氟离子高硅丝光沸石表征 fluoride anion high silica mordenite characterization
DOI	10.3866/PKU.WHXB20060214
英文摘要	采用XRD、SEM、FT-IR、MASNMR等表征手段,对以氟离子为结构导向剂无胺法合成的高硅丝光沸石进行了表征.结果表明:高硅丝光沸石结构属立方晶系,晶胞参数小于传统低硅丝光沸石,但b、c值要比相近硅铝比非氟体系合成的丝光沸石样品的大;样品形貌及粒径与其硅铝比有关,表明晶化条件对产物形貌及粒径均有影响;随硅铝比的增大,FT-IR光谱中450、544、1053cm-1谱带向高频移动,720cm-1谱带强度减弱,表明骨架中铝减少而硅增多;采用含氟无胺体系合成高硅丝光沸石时基本上不会产生非骨架铝.; A series of high silica mordenite samples synthesized from amine-free system using fluoride as structure-directing agent were characterized by XRD, SEM, FT-IR, and MAS NMR. The results confirmed that the samples were truly mordenite with high SiO2/Al2O3 molar ratio. The unit cell constants a, b, c and the unit cell volume (axbxc) of M-36 sample were smaller than those of mordenite with silica alumina molar ratio (SAR)=10 reported in the literature, which indicated the unit cell contraction caused by the replacement of Al atoms by smaller Si atoms. However, compared with the sample with SAR=31.5 synthesized from free-fluoride system, the lattice parameters of M-36 were somewhat increased in the a and c directions, but elongated obviously in b direction, which indicated some influences on 8-membered ring parallel to the b axis of mordenite structure should be brought by using fluoride as structure-directing agent. As the SAR of mordenite samples increased, a variety of crystal morphologies (cuboids, hexagonal prismatic crystals, rectangular parallelepiped crystals) was observed and a wide variation in the crystallite size was presented. As the SAR changed from 14 to 55, in the infrared spectra of the samples, the band attributed to T-O bending vibration shifted from 434 cm(-1) to 450 cm(-1), and its absorption intensity also increased. The band at 720 cm(-1) which corresponded to the internal symmetric stretching vibration of the AlO4 tetrahedral in the mordenite from a weak band developed into a broad band and nearly disappeared at last, indicating that the number of SiO4 in the framework was increased. In Al-27 MAS NMR spectra, almost all high silica mordenite samples presented a peak at delta(55.6) and no non-framework Al species peak at about delta(0), which was different from steamed or acid-leached siliceous mordenite.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000235471100014&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 5; 02; 198-202; 22
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/86309]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	祁晓岚,王战,李士杰,等. 无胺法合成高硅丝光沸石的表征, Characterization of high silica mordenite synthesized from amine-free system using fluoride as structure-directing agent[J]. 物理化学学报,2006.
APA	祁晓岚,王战,李士杰,李斌,刘希尧,&林炳雄.(2006).无胺法合成高硅丝光沸石的表征.物理化学学报.
MLA	祁晓岚,et al."无胺法合成高硅丝光沸石的表征".物理化学学报 (2006).