Highly Active and Stable Alumina Supported Nickel Nanoparticle Catalysts for Dry Reforming of Methane

Abstract

A highly stable and extremely active nickel (Ni) nanoparticle catalyst, supported on porous γ-Al2O3 particles, was prepared by atomic layer deposition (ALD). The catalyst was employed to catalyze the reaction of dry reforming of methane (DRM). The catalyst initially gave a low conversion at 850°C, but the conversion increased with an increase in reaction time, and stabilized at 93% (1730 L h-1 g Ni-1 at 850°C). After regeneration, the catalyst showed a very high methane reforming rate (1840 h-1 g Ni-1 at 850°C). The activated catalyst showed exceptionally high catalytic activity and excellent stability of DRM reaction in over 300 h at temperatures that ranged from 700°C to 850°C. The excellent stability of the catalyst resulted from the formation of NiAl2O4 spinel. The high catalytic activity was due to the high dispersion of Ni nanoparticles deposited by ALD and the reduction of NiAl2O4 spinel to Ni during the DRM reaction at 850°C. It was verified that NiAl2O4 can be reduced to Ni in a reductive gas mixture (i.e., carbon monoxide and hydrogen) during the reaction at 850°C, but not by H2 alone.

Department(s)

Chemical and Biochemical Engineering

Keywords and Phrases

Alumina; Atomic Layer Deposition (ALD); Carbon; Carbon Monoxide; Catalyst Activity; Catalysts; Deposition; Methane; Nanoparticles; Nickel; Alumina Supported Nickel; Dry Reforming-of-Methane (DRM); High Dispersion; Highly Stables; Methane Reforming; Nanoparticle Catalysts; Ni Nanoparticles; NiAl2O4 Spinel; Catalyst Supports; Supported Catalyst

International Standard Serial Number (ISSN)

0926-3373

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2017 Elsevier, All rights reserved.

Publication Date

01 Feb 2017

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