文献类型：期刊文献

英文题名：Crystallization of ATO silicoaluminophosphates nanocrystalline spheroids using a phase-transfer synthetic strategy for n-heptane hydroisomerization

作者：Yue, Tao[1];Liu, Wei[2];Li, Liyuan[2];Zhao, Xiaoling[1];Zhu, Kake[1];Zhou, Xinggui[1];Yang, Weimin[2]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, UNILAB, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Sinopec, Shanghai Res Inst Petrochem Technol, 1658 Pudong North Rd, Shanghai 201208, Peoples R China

年份：2018

卷号：364

起止页码：308

外文期刊名：JOURNAL OF CATALYSIS

收录：;EI(收录号：20182605359723);WOS:【SCI-EXPANDED(收录号:WOS:000440391600030)】；

基金：KZ is grateful for the financial support from National Natural Science Foundation of China (21576082). XZ is sponsored by the National Natural Science Foundation of China (U1162112), Fundamental Research Funds for the Central Universities (WB 12130041) and Financial Support from Sinopec Group (contract 415063). Authors are grateful to the assistance of dark field microscopy provided by Prof Yitao Long. The authors thank Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterizations.

语种：英文

外文关键词：SAPO-31; Phase-transfer synthesis; Pickering emulsion; Nanozeolites; Hydroisomerization; Diffusion; Kinetic study; N-heptane

摘要：Changing size and shape of zeolitic crystals brings about enhanced diffusion properties and related promotion of catalytic performances. This work puts forward a phase-transfer synthetic strategy to generate ATO nanocrystalline silicoaluminophosphates spheroids under tumbling crystallization using aluminum isopropoxide dissolved in toluene and other ingredients (fumed silica/phosphoric acid/Di-n-hexylamine) dissolved in water as precursors. Toluene and aqueous phase formed a Pickering emulsion like structure during hydrothermal crystallization. Highly uniform crystalline spheroids of weighted 55 nm with strong acidity and high surface area were obtained, which exhibited a high isomer yield up to 79% in n-heptane hydroisomerization. Comparisons of product distribution and kinetic studies suggest that monomethyl-branched isomer selectivity is controlled by product shape selectivity, whereas dimethylbranched isomer selectivity is affected by combined transition state and product shape selectivity. The increase in selectivity for ATO spheroids is attributed to an expansion of intrinsic reaction controlled temperature regime and an improved diffusion property. (C) 2018 Elsevier Inc. All rights reserved.