Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2014-11-01

Journal: 11th International Conference on Catalysis in Membrane Reactors

Included Journals: Scopus、CPCI-S、EI、SCIE

Volume: 236

Issue: PART A

Page Number: 41-48

ISSN: 0920-5861

Key Words: Pd catalyst; Zeolite; Metal-organic framework; Core-shell structure; Alkene hydrogenation

Abstract: A well-designed Pd/ZSM-5@ZIF-8 core-shell structure has been prepared by application of a combination of seed-induction synthesis strategy and self-assembly synthesis techniques. First, uniform ZSM-5 particles with micron size and high crystallinity were prepared from organic-template-free gel systems containing 200 nm ZSM-5 seeds and exchanged with Pd(NO3)(2) aqueous solution. Then incompatibility between the Pd/ZSM-5 core material and ZIF-8 shell precursor was circumvented by surface modification using a layer by layer self-assembly of polyelectrolyte, followed by a subsequent two-step temperature synthesis process inducing the formation of continuous and well-intergrown ZIF-8 shell. Thickness of ZIF-8 shell can be simply tuned by monitoring the assembly cycles. Furthermore, hydrogenations of 1-hexene and cyclohexene were chosen as model reactions to evaluate the catalytic behavior of the Pd/ZSM-5@ZIF-8 core-shell architecture and tert-dodecylthiol was used as a poison to test its anti-poisoning ability. Results show that such core-shell architecture exhibits excellent poison resistance and selectivity control properties for the hydrogenation reactions and can be potentially used as a membrane reactor in the field of heterogeneous catalysis. (C) 2013 Elsevier B.V. All rights reserved.