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New synthesis strategies for Ni/Al2O3-Sil-1 core–shell catalysts for steam reforming of methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
54065 46995 2014 7 PDF Available
Title
New synthesis strategies for Ni/Al2O3-Sil-1 core–shell catalysts for steam reforming of methane
Abstract

•A novel strategy was developed to prepare the Ni/Al2O3-Sil-1 core–shell catalyst.•The new method involves first growing Sil-1 shell then loading active sites.•The core–shell catalyst by new method could show better activity than that by the traditional method.

The catalytic performance of Ni/Al2O3-Sil-1 core–shell catalysts was investigated for the steam reforming of methane (SRM). The core–shell catalysts consisting of Ni/Al2O3 core catalyst and silicalite-1 (Sil-1) zeolite shell were prepared by different synthesis routes. Catalyst characterization indicates that repeated calcination at elevated temperatures during the catalyst preparation should be avoided to prevent the formation of the inactive NiAl2O4 spinel phase. Thus, the new preparation procedure for the core–shell catalyst involves first growing a Sil-1 shell on the alumina beads to obtain Al2O3-Sil-1 core–shell beads, followed by an incipient wetness impregnation to obtain a Ni/Al2O3-Sil-1 catalyst. The catalytic activity of the catalyst for the SRM reaction displayed ca. 10% improvement over core–shell catalysts prepared by traditional method. The prepared catalysts maintained high reactivity even when exposed to alkali vapor during reaction.

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Keywords
Nickel catalyst; Core–shell structure; Molecular sieve membrane; Methane steam reforming; Catalyst deactivation
First Page Preview
New synthesis strategies for Ni/Al2O3-Sil-1 core–shell catalysts for steam reforming of methane
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 236, Part A, 1 November 2014, Pages 34–40
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis