NMR invisible" aluminum species in dealuminated mordenite zeolite:a 1H/27Al TRAPDOR NMR study

被引：0

作者：

邓风

岳勇

叶朝辉

机构：

来源：

Science China Chemistry | 1998年 / 02期

关键词：

1H/27 Al TRAPDOR; 27 Al MAS; NMR invisible Al; mordenite;

D O I：

暂无

中图分类号：

O482.55 [磁光效应];

学科分类号：

070205 ; 0805 ; 080502 ; 0809 ;

摘要：

Various kinds of aluminum species in dealuminated mordenite were investigated in detail, and the quadrupole coupling constants (QCCs) for aluminum atoms associated with these species were obtained by means of the newly introduced 1 H/ 27 Al TRAPDOR method as well as 27 Al magic angle spinning (MAS) nuclear magnetic resonance (NMR). QCC values of 11.3, 15.3, 13.3 and (14.0±0.6) MHz were determined from the TRAPDOR profiles for Lewis acid sites, Bronsted acid sites (SiOHAl) and two kinds of non framework aluminum species Al(OH) n , respectively. The source of the "invisible Al" is discussed on the basis of the NMR experimental results.

引用

页码：149 / 155

页数：7

共 9 条

[1]

AcidsitesandhydrationbehaviorofdealuminatedzeoliteHZSM 5:ahighresolutionsolidstateNMRstudy. Deng,F,Du,Y,Ye,C .etal. The Journal of Physical Chemistry . 1995

[2]

Shape Selective Catalysis in Industrial Application. Chen N Y,Garwood W E,Dwyer F G. New York: Marcel Dekker . 1989

[3]

Determination of quadrupole coupling constant of invisible aluminum spins in zeolite HY with 1H/ 27 Al TRAPDOR NMR. Grey C P,Vega A J. Journal of the American Chemical Society . 1995

[4]

Magic angle spinning NMR studies of water molecules adsorbed on Bronsted and Lewis acid sites in zeolites and amorphous silica-aluminas. Hunger M,Freude D,Pfeifer H. Journal of the Chemical Society Faraday Transactions . 1991

[5]

Probingcatalystswithwater. Sauer,J. Science . 1996

[6]

27Aland29SisolidstateNMRstudiesondealuminatedmordenite. Barras,J,Klinowski,J. J .Chem.Soc.FaradayTrans . 1994

[7]

NMRstudiesofzeolite. Pfeifer,H,Ernst,E. AnnualReportonNMRSpectroscopy . 1994

[8]

1HMASand1H{23Na}doubleresonanceNMRstudiesonthemodificationofsurfacehy droxylgroupsofγ aluminabysodium. Deng,F,Du,Y,Ye,C .etal. SolidStateNucl.Magn.Reson . 1997

[9]

Solid state NMR studies of acid sites in zeolites. Freude D,Ernst H,Wolf I. Solid State Nucl Magn Reson . 1994

← 1 →