Rapid synthesis of AlPO-18 molecular sieve for gas separation with dual-template agent

分子筛 结晶度 微型多孔材料 模板 化学工程 化学 吸附 沸石 氢氧化铵 催化作用 纳米技术 材料科学 有机化学 结晶学 工程类
作者
Ying Tu,Tianqi Zhan,Ting Wu,Fei Zhang,Izumi Kumakiri,Xiangshu Chen,Hidetoshi Kita
出处
期刊:Microporous and Mesoporous Materials [Elsevier]
卷期号:327: 111436-111436 被引量:9
标识
DOI:10.1016/j.micromeso.2021.111436
摘要

A rapid and facile strategy for AEI type AlPO-18 molecular sieves preparation was hydrothermally processed by dual templates of TEAOH (tetraethyl ammonium hydroxide) and low-cost DIPEA (N, N-diisopropylethylamine). Pure and high crystallinity AlPO-18 molecular sieve with the crystal size of 2 μm and the aspect ratio about 20 were obtained in a short period of 1 h under the dual-template strategy. The effect of single and binary templates on the growth process of AlPO-18 molecular sieve was compared in detail. TEAOH is conducive to the pure phase AEI formation since a long synthesis time is needed. DIPEA favors to the rapid formation of AEI structure, however the sole DIPEA template promotes to form the AFI type AlPO-5 impurities. The combined templates TEAOH/DIPEA work synergistically, and the 13C MAS NMR results showed that both the TEAOH and DIPEA templates were occluded in micropore space of AlPO-18 molecular sieves. In addition, the adsorption isotherms of CO2, CH4 and N2 on the samples synthesized by dual-template for 1 h were tested and compared with other AlPO-18 molecular sieves reported in the literature. The results showed that the current AlPO-18 molecular sieve is expected to be used as adsorbent for light gas separation.
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