分子筛SAPO - 34形成过程的固态核磁共振研究。
A solid-state NMR study of the formation of molecular sieve SAPO-34.
作者信息
Yan Zhimin, Chen Banghao, Huang Yining
机构信息
Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7.
出版信息
Solid State Nucl Magn Reson. 2009 Apr;35(2):49-60. doi: 10.1016/j.ssnmr.2008.12.006. Epub 2009 Jan 4.
This work examined the formation of a catalytically important microporous material, SAPO-34, in the presence of HF under hydrothermal synthesis conditions. The local environments of P, Al, F and Si atoms in several solid phases obtained at different stages of crystallization were characterized by several solid-state NMR techniques including (31)P, (27)Al, (19)F and (29)Si MAS, (27)Al triple-quantum MAS, (31)P{(27)Al} transfer of populations in double-resonance, (27)Al{(31)P} rotational-echo double-resonance (REDOR), (27)Al-->(31)P heteronuclear correlation spectroscopy, (31)P{(19)F} and (27)Al{(19)F} REDOR as well as (1)H-->(31)P cross polarization. The NMR results provide the new insights into the formation of SAPO-34.
这项工作研究了在水热合成条件下，在HF存在的情况下，具有催化重要性的微孔材料SAPO-34的形成。通过多种固态NMR技术对在不同结晶阶段获得的几种固相中的P、Al、F和Si原子的局部环境进行了表征，这些技术包括（31）P、（27）Al、（19）F和（29）Si MAS、（27）Al三量子MAS、双共振中（31）P{（27）Al}的种群转移、（27）Al{（31）P}旋转回波双共振（REDOR）、（27）Al→（31）P异核相关光谱、（31）P{（19）F}和（27）Al{（19）F} REDOR以及（1）H→（31）P交叉极化。NMR结果为SAPO-34的形成提供了新的见解。
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