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《Chemical Research In Chinese Universities》 2004-08
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A Multinuclear Solid State NMR Study on Dealumination of Mordenite by Steaming and Acid-leaching

ZHANG Ming-Jin 1,2 *,CHEN Lei 2,YI De-Lian 1,ZHENG An-Min 2,YANG Jun 2, DENG-Feng 2,YUE Yong 2,YE Chao-Hui 2 (1. Department of Chemistry,Wuhan University of Science and Technology,Wuhan 430081,China; 2. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071,China)  
The steamed and acid-leached mordenite samples were examined by high-resolution solid state 1H, 29 Si, 27 Al magic angle spinning (MAS) and 1H/ 29 Si cross polarization (CP) NMR spectroscopic techniques in order to study the aluminum species and evaluate the dealumination process during steaming and leaching. The NMR experiments provide a direct evidence for the existence of nonframework four-coordinated Al species,Al(OH) 3\5H 2O,giving rise to a 1H resonance at δ 3.0 and a 27 Al shoulder peak at δ 45,which are different from the distorted four-coordinated Al species. At a high temperature,water molecules will favor the formation of these Al species and extra-framework penta- and hexa-coordinated Al species in the 27 Al spectrum at δ 30 and δ 0,respectively. 1H/ 29 Si CP and 1H MAS NMR showed the presence of an abundance of SiOH and AlOH groups in the dealuminated mordenites during the steaming process.
【Fund】: 国家重大基础研究前期研究专项 (批准号 :2 0 0 2 CCC0 2 2 0 0 );; 国家自然科学基金 (批准号 :2 0 2 73 0 82);; 波谱与原子分子物理国家重点实验室基金资助
【CateGory Index】: O657.2
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