%0 Journal Article
%T The 27 Al State in CeO2-γ-A12O3 Mixed Oxides Determined by Solid-State NMR Spectroscopy<br>用固体核磁共振方法研究CeO2-γ-Al2O3混合氧化物中的Al状态
%A HU Wei
%A SU Yong-chao
%A CHEN Lei
%A YUE Yong
%A LI Shi-jie
%A DENG Feng
%A <br>胡伟
%A 苏永超
%A 陈雷
%A 岳勇
%A 李士杰
%A 邓风
%J 波谱学杂志
%D 2007
%I 
%X In this work, CeO2-γ-Al2O3 mixed oxides were studied by solied NMR techniques to understand the interaction between CeO2 and γ-Al2O3.The 27Al magic angle spinning (MAS) NMR spectra of the mixed oxides showed a sharp peak at ca.37 ppm and a high-field shoulder,in addition to the signals from tera- and hexa-coordinated 27Al sites. It was demon-strated that the sharp peak at ca.37 ppm originates from the 27Al atomes residing in the lattice of CeO2 with an eigh-fold coordinatio, representing the interaction between CeO2 and γ-Al2O3;the high-field broad shoulder peak arises from penta-coordinated Al sites originally present in γ-Al2O3.It was postulated that four Al3+ ions have replaced the three Ce4+ions in three CeO2 crystal cell so that the overall charge balance of the systerm is maintained. Further-more,it was shown that the concentration of Al substitution is limited, and only about 1% of the total CeO2 can be replaced by Al3+.
%K 27AlMASNMR
%K CeO2
%K MQMASNMR
%K 27AlMASNMR
%K CeO2
%K substiution
%K MQMASNMR<br>27Al
%K MAS
%K NMR
%K CeO2
%K γ-Al2O3
%K 取代
%K MQMAS
%K NMR
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=1A3C8C6E452BD1AF5A6B6B99BA3989C9&aid=CA443B01A9BCB36D&yid=A732AF04DDA03BB3&vid=B91E8C6D6FE990DB&iid=CA4FD0336C81A37A&sid=BCA2697F357F2001&eid=C5154311167311FE&journal_id=1000-4556&journal_name=波谱学杂志&referenced_num=0&reference_num=21