Aqueous Miscible Organic LDH Derived Ni-Based Catalysts for Efficient CO2 Methanation

Ziling Wang,Qiang Wang,Angelos Efstathiou,Tomas Reina,Liang Huang

doi:10.3390/catal10101168

Ziling Wang, Qiang Wang + Show 3 more

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https://doi.org/10.3390/catal10101168

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Abstract

Converting CO2 to methane via catalytic routes is an effective way to control the CO2 content released in the atmosphere while producing value-added fuels and chemicals. In this study, the CO2 methanation performance of highly dispersed Ni-based catalysts derived from aqueous miscible organic layered double hydroxides (AMO-LDHs) was investigated. The activity of the catalyst was found to be largely influenced by the chemical composition of Ni metal precursor and loading. A Ni-based catalyst derived from AMO-Ni3Al1-CO3 LDH exhibited a maximum CO2 conversion of 87.9% and 100% CH4 selectivity ascribed to both the lamellar catalyst structure and the high Ni metal dispersion achieved. Moreover, due to the strong Ni metal–support interactions and abundant oxygen vacancy concentration developed, this catalyst also showed excellent resistance to carbon deposition and metal sintering. In particular, high stability was observed after 19 h in CO2/H2 reaction at 360 °C.

Highlights

The concentration of CO2 in the atmosphere has risen from 270 to 385 ppm in the past 200 years which has been causing serious problems such as the greenhouse effect, global climate change, and glaciers melting [1,2,3]
Selective CO2 methanation reaction was conducted over NiAl LDH derived catalysts which were prepared by coprecipitation and aqueous miscible organic (AMO) treatment
Dispersed Ni particles on the catalyst surface led to higher catalytic activity for CO2 methanation

Summary

Introduction

The concentration of CO2 in the atmosphere has risen from 270 to 385 ppm in the past 200 years which has been causing serious problems such as the greenhouse effect, global climate change, and glaciers melting [1,2,3]. Regarding these environmental issues, three ways to reduce CO2 content in the atmosphere have been suggested [4,5,6,7], namely CO2 emission reduction, CO2 capture and storage (CCS), and CO2 conversion and utilization.

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