Effect of Ionothermal Synthesis on the Acidity and Catalytic Performance of a SAPO-5 Molecular Sieve

被引：11

作者：

Feng, Jie ^{[1
]}

Guo, Lulu ^{[1
]}

Wang, Zheng ^{[2
]}

Wang, Baishun ^{[1
]}

Wang, Jianfeng ^{[1
]}

Lu, Tianliang ^{[1
]}

Xu, Jun ^{[1
]}

Zhan, Yuzhong ^{[1
]}

Rawal, Aditya ^{[3
]}

Zhao, Chuan ^{[4
]}

Han, Li ^{[1
]}

机构：

[1] Zhengzhou Univ, Sch Chem Engn, Zhengzhou 450001, Henan, Peoples R China

[2] Ningxia Univ, Inst Chem & Chem Engn, Key Lab Energy Resources & Chem Engn, Yinchuan 750021, Peoples R China

[3] Univ New South Wales, Mark Wainwright Analyt Ctr, NMR Facil, Sydney, NSW 2052, Australia

[4] Univ New South Wales, Sch Chem, Sydney, NSW 2052, Australia

来源：

CHEMISTRYSELECT | 2019年 / 4卷 / 35期

基金：

中国国家自然科学基金;

关键词：

SAPO-5; ionic liquids; ionothermal synthesis; acid site; methanol conversion; SOLVENT-FREE SYNTHESIS; CARBON-DIOXIDE; DIMETHYL-ETHER; IONIC LIQUID; METHANOL; EFFICIENT; ZEOLITE; CYCLOADDITION; COMPOSITE; MEMBRANES;

D O I：

10.1002/slct.201902643

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

SAPO-5 molecular sieves (E-SAPO-5) were synthesized ionothermally in 1-ethyl-2,3-dimethylimidazolium bromides ([EMMIM]Br) ionic liquid (IL). The samples were characterized by X-ray diffraction (XRD), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), N-2 isothermal adsorption-desorptionand, temperature-programmed desorption of ammonia (NH3-TPD) and fourier transform infrared (FT-IR) spectroscopy. Moreover, the catalytic performances of the samples in the methanol conversion reaction were investigated. Relative to the hydrothermal method, ionothermal synthesis favored the formation of large silica islands mainly by the SM3 substitution mechanism and decreased the B acid sites and the strong acid and total acid amounts of E-SAPO-5, which significantly influenced the distribution of the products in the methanol conversion reaction. Methanol underwent the methanol-to-dimethyl-ether (MTD) reaction and methanol-to-olefin (MTO) reaction over the E-SAPO-5 and hydrothermally synthesized SAPO-5, respectively. E-SAPO-5 exhibited high MTD activity at the high temperature of 450 degrees C with methanol conversion of 100% and dimethyl ether (DME) selectivity of 86.6%.

引用

页码：10520 / 10524

页数：5

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