%0 Journal Article
%T Detection of Distorted Tetrahedral-Coordinate Aluminum in Dealuminated Mordenite by 27Al 3Q MAS NMR<br>脱铝丝光沸石中扭曲四配位铝的27Al 3Q MAS NMR研究
%A FEI Hai-long
%A SUN Ping-chuan
%A CHEN Tie-hong
%A LI Bao-hui
%A DING Da-tong
%A <br>费海龙
%A 孙平川
%A 陈铁红
%A 李宝会
%A 丁大同
%J 波谱学杂志
%D 2005
%I 
%X Al MAS and 3Q MAS NMR spectroscopy was applied to study the aluminum coordination in dealuminated zeolite mordenite and amorphous silica-alumina A signal ascribed to distorted tetrahedral-coordinate Al (DTA) was detected By comparison with amorphous silica-alumina, it was found that the presence of distorted tetrahedral-coordinate species is a typical feature in crystalline zeolites after activation and dealumination From these experimental results we suggest that the DTA species, which are absent in amorphous silica-alumina, locate at the interface between the crystalline framework lattice and the extra-framework species formed by dealumination
%K NMR
%K multiple quantum magic angle spinning (3Q MAS) NMR
%K mordenite
%K dealumination
%K distorted tetrahedral-coordinated Al (DTA)<br>脱铝
%K 硅铝胶
%K 丝光沸石
%K 无定形
%K 骨架铝
%K DTA
%K 配位
%K 铝丝
%K 扭曲
%K NMR
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=1A3C8C6E452BD1AF5A6B6B99BA3989C9&aid=CBF5C899944D9647&yid=2DD7160C83D0ACED&vid=BC12EA701C895178&iid=CA4FD0336C81A37A&sid=1D0FA33DA02ABACD&eid=5C3443B19473A746&journal_id=1000-4556&journal_name=波谱学杂志&referenced_num=0&reference_num=30