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Doped Ni Thin Layer Catalysts for Catalytic Decomposition of Natural Gas to produce hydrogen

Paper ID Volume ID Publish Year Pages File Format Full-Text
42615 45933 2009 8 PDF Available
Title
Doped Ni Thin Layer Catalysts for Catalytic Decomposition of Natural Gas to produce hydrogen
Abstract

Doped Ni-based Thin Layer Catalysts (Ni-TLCs) for Catalytic Decomposition of Natural Gas (CDNG) were investigated using a new Multilayer Catalytic Reactor (MCR). The influence of K, La, Mg and Cl on activity–stability patterns of a Ni-TLC catalyst was evaluated. An inverse straight-line relationship between carbon capacity (C/Ni, number of CH4 molecules decomposed for Ni atom until complete deactivation) and reaction temperature was found independently of the dopant used. However, dopants significantly affect Ni specific activity (TOF, s−1), acting as either an electronic promoter or inhibiting Ni sintering phenomena. Reaction temperature is a key parameter in determining the evolution of coke. At low reaction temperature (<823 K), carbon whiskers form prevalently on “bare” and Mg, La, and Cl doped samples, whereas only the encapsulating carbon type formed on a K doped system. High hydrogen productivity was obtained on an Mg doped catalyst which, furthermore, proved to be the most stable system.

Graphical abstractDoped Ni-based Thin Layer Catalysts (Ni-TLCs) for Catalytic Decomposition of Natural Gas (CDNG) to produce CO free hydrogen were investigated using a new Multilayer Catalytic Reactor (MCR). The influence of K, La, Mg and Cl on activity–stability patterns of a Ni-TLC catalyst was evaluated. The influence of dopant on Ni sintering phenomena and coke formation mechanism was addressed.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Methane decomposition; Hydrogen “COx free”; Ni Thin Layer Catalyst; Multilayer Reactor; Silica cloth; Coke; Ni dopant
First Page Preview
Doped Ni Thin Layer Catalysts for Catalytic Decomposition of Natural Gas to produce hydrogen
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 365, Issue 1, 15 August 2009, Pages 122–129
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis