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author:

Xu, Songlin (Xu, Songlin.) [1] | Zhang, Mingyi (Zhang, Mingyi.) [2] | Guo, Shujuan (Guo, Shujuan.) [3] | Li, Mengru (Li, Mengru.) [4] | Huang, Qingming (Huang, Qingming.) [5] | Chen, Xiaohui (Chen, Xiaohui.) [6]

Indexed by:

EI

Abstract:

Abstract: Diffusion limitation caused by microporous molecular sieves has always been a bottleneck problem in liquid phase epoxidation. In this study, several different carbon sources were used as hard templates to prepare hierarchically porous zeolite Ti-MWW (cTi-MWW) successfully. Compared with conventional Ti-MWW, cTi-MWW has an additional hierarchically porous structure and abundant pore structure distribution. Especially, the cTi-MWW prepared with polyethylene glycol1540 (PEG) as the hard template not only has a multiple hierarchically porous structure, but also exhibits small crystal size and good hydrophobicity properties studied by TEM and in situ FT-IR. At the same time, the cTi-MWW prepared with PEG exhibits better activity than the conventional Ti-MWW in the selective epoxidation reaction of allyl alcohol (AAL) with H2O2 as oxidant and the conversion is improved by 11% (Si/Ti = 20). And a higher efficiency and longer catalyst life in fixed-bed catalytic reactor were exhibited by using cTi-MWWPEG as catalyst. The physicochemical properties of cTi-MWW prepared with different hard templates were systematically studied by SEM, XPS, UV–Vis, XRD and N2 absorption–desorption techniques. This method is effective for the synthesis of cTi-MWW and significant for the preparation of hierarchically porous zeolites in industrial production. Graphic Abstract: A hierarchically porous zeolite Ti-MWW prepared with different hard templates successfully. With the hierarchically porous structure, which have better adsorption, diffusion, and reactivity in liquid phase epoxidation, thus improving the catalytic activity. Especially, the hierarchically porous zeolite Ti-MWW prepared with polyethylene glycol exhibits small crystal size and good hydrophobicity properties.[Figure not available: see fulltext.]. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

Keyword:

Aliphatic compounds Catalyst activity Crystals Crystal structure Diffusion Epoxidation Grain size and shape Hydrophobicity Molecular sieves Physicochemical properties Polyethylenes Pore structure Porosity Zeolites

Community:

  • [ 1 ] [Xu, Songlin]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou; Fujian; 350002, China
  • [ 2 ] [Zhang, Mingyi]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou; Fujian; 350002, China
  • [ 3 ] [Guo, Shujuan]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou; Fujian; 350002, China
  • [ 4 ] [Guo, Shujuan]Ocean College, Minjiang University, Fuzhou; Fujian; 350108, China
  • [ 5 ] [Li, Mengru]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou; Fujian; 350002, China
  • [ 6 ] [Huang, Qingming]Testing Centre, Fuzhou University, Fuzhou; Fujian; 350116, China
  • [ 7 ] [Chen, Xiaohui]National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou; Fujian; 350002, China

Reprint 's Address:

  • [chen, xiaohui]national engineering research center of chemical fertilizer catalyst, school of chemical engineering, fuzhou university, fuzhou; fujian; 350002, china

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Source :

Catalysis Letters

ISSN: 1011-372X

Year: 2020

Issue: 1

Volume: 150

Page: 209-221

3 . 1 8 6

JCR@2020

2 . 3 0 0

JCR@2023

ESI HC Threshold:160

JCR Journal Grade:3

CAS Journal Grade:4

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 3

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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