Journal article

Synthesis of Ni5Ga3 catalyst by Hydrotalcite-like compound (HTlc) precursors for CO2 hydrogenation to methanol

Y Men, X Fang, Q Gu, R Singh, F Wu, D Danaci, Q Zhao, P Xiao, PA Webley

Applied Catalysis B: Environmental | Elsevier | Published : 2020

Abstract

A Ni5Ga3 catalyst synthesized from hydrotalcite-like compound (HTlc) precursors was examined for CO2 hydrogenation to methanol. HTlc precursors with a nickel atomic percentage of 65 % balanced with gallium were prepared by a urea hydrolysis hydrothermal method, and fully characterized. The HTlc phase in the nickel–gallium precipitant became better crystallized and the structure became more stable as the synthesis reaction temperature increased. Bimetallic alloy Ni5Ga3 was obtained by reducing the as-prepared HTlc precursors in a flow of 5 % H2 balanced with Ar at a temperature of 700 °C. Ni–Ga HTlc precursor prepared at a hydrothermal temperature of 110 °C resulted in the formation of bimeta..

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Funding Acknowledgements

This work was supported by Australian Research Council (ARC). The authors are grateful for Monash centre of electron microscopy (MCEM), Monash X-ray platform (MXP), and XAS, PD beamline (Australian Synchrotron, ANSTO) for providing SEM, PXRD, and XAS technological support, respectively. The authors also thank the Materials Characterisation and Fabrication Platform (MCFP) teams in the University of Melbourne, the Victorian Node of the Australian National Fabrication Facility (ANFF), and Melbourne Advanced Microscopy Facility at Bio21.