文献类型：期刊文献

英文题名：Nonclassical from-shell-to-core growth of hierarchically organized SAPO-11 with enhanced catalytic performance in hydroisomerization of n-heptane

作者：Jin, Dongliang[1];Liu, Zhiting[1];Zheng, Jingwei[1];Hua, Weiming[2];Chen, Jiao[1];Zhu, Kake[1];Zhou, Xinggui[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, UNILAB, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Dept Chem, Shanghai 200433, Peoples R China

年份：2016

卷号：6

期号：39

起止页码：32523

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20161802331028);WOS:【SCI-EXPANDED(收录号:WOS:000374045900015)】；

基金：XZ is sponsored by the National Natural Science Foundation of China (U1162112). KZ is grateful for the financial support from National Natural Science Foundation of China (21576082), Fundamental Research Funds for the Central Universities (WB 1213004-1). WH is grateful for the financial support from the Science and Technology Commission of Shanghai Municipality (13DZ2275200). LZ is supported by China Postdoctoral Science Foundation Grant No. 2015M580299 and Fundamental Research Funds for the Central Universities (1514011).

语种：英文

外文关键词：Heptane - Catalyst activity - Microporous materials - Physisorption

摘要：Integrating hierarchical porosity over microporous zeotype materials is an effective way to promote their mass transfer properties and catalytic performances. A combined synthetic strategy using small molecular growth inhibitor 1,2,3-hexanetriol and tumbling crystallization condition to generate hierarchically organized SAPO-11 is herein presented. The addition of 1,2,3-hexanetriol in the synthetic gel of SAPO-11 under agitating conditions significantly altered its crystallization behaviour, resulting in the formation of a hierarchically organized architecture. An underlying nonclassical from-shell-to-core crystallization has been disclosed by time-dependent observation of the formation process. The hierarchically self-organized structure has been characterized by a suite of characterization techniques, such as XRD, N-2 physisorption, SEM, TEM, mercury intrusion measurements, Al-27, Si-29, P-31 MAS NMR and pyridine adsorption IR (Py-IR). The structure featuring barrel-shaped architecture is comprised of aligned 300-400 nm primary building blocks with voids in between, constructing an auxiliary macro-/mesopore system open to external surfaces. The catalytic performance of Pt supported on hierarchical SAPO-11 in n-heptane hydroisomerization has been assessed, showing that both catalytic activity and isomer yield have been increased with respect to a conventional sample. As the acidity for the hierarchical SAPO-11 is comparable to the conventional sample, the enhancement in catalytic performance is attributed to the small primary crystal size and macro-/meso-pore-connectivity, that are important for mass transfer.