New insights into the di-n-propylamine (DPA) molecule as an organic structural directing agent (OSDA) in the crystallization of AlPO4-11 molecular sieve
New insights into the di-n-propylamine (DPA) molecule as an organic structural directing agent (OSDA) in the crystallization of AlPO4-11 molecular sieve
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对二正丙胺 (DPA) 分子作为 AlPO4-11 分子筛结晶中的有机结构导向剂 (OSDA) 的新见解
DOI:
10.1039/c8qi00346g
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发表时间:
2018-07
影响因子:
7
通讯作者:
Deng Feng
中科院分区:
文献类型:
--
作者:
Sheng Na;Chu Yueying;Xin Shaohui;Wang Qiang;Liu Xiaolong;Xu Jun;Xiao Feng-Shou;Deng Feng
Advanced solid-state NMR techniques, including PT-J-HMQC 27Al/31P double-resonance NMR, 2D 31P and 1H DQ-SQ MAS NMR experiments, have been used to study the structure-directing effect in the crystallization of the molecular sieve AlPO4-11 synthesized by a solvent-free method. Our studies clearly demonstrate the mechanism of crystallization of the molecular sieve AlPO4-11 for the first time as follows: (i) the organic template of di-n-propylamine (DPA) molecules can effectively induce transformation from the 4- and/or 6-MR chains to a 2D-layered structure through H-bond interactions; (ii) the formation of a twin molecule (two-DPA) drives the transformation from a 2D-layered structure to 3D crystals. Theoretical calculations further confirm that the formation of the twin DPA molecule is thermodynamically stable in the channels of AlPO4-11. Deep understanding of the role of OSDAs in crystallization is potentially important for the design and synthesis of aluminophosphate-based molecular sieves with novel structures and new routes.
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