Abstract
Highly dispersed Ni-based catalysts for CO2 methanation have been extensively studied over the last decade. However, a highly loaded Ni-based catalyst always results in a large Ni particle size and poor CO2 methanation activity. In this work, a colloidal solution combustion method was used to prepare a highly loaded Ni–La2O3 catalyst (50 wt % Ni) with a small Ni particle size and abundant metal–support interface. The characterizations demonstrated that a Ni–La2O3 catalyst prepared in this way has a mesoporous structure and a small Ni particle size. Due to the small Ni particle size and abundant metal–support interface, the highly loaded mesoporous Ni–La2O3 catalyst exhibits higher activity and selectivity in CO2 methanation compared to the Ni–La2O3 catalyst prepared by a conventional solution combustion method.
Highlights
CO2 emissions have increased rapidly due to the increasing consumption of fossil fuels, resulting in global warming and climate change
It is significantly and comparatively easier to reduce the catalyst prepared by the colloidal solution combustion method due to the absence of LaNiO3
57.0 significantly and comparatively easier to reduce the catalyst prepared by the colloidal solution a Calculated from H -temperature programmed desorption (H -TPD) results. b turnover frequency (TOF) (s−1 ) represents the number of combustion method2 due to the absence of LaNiO3
Summary
CO2 emissions have increased rapidly due to the increasing consumption of fossil fuels, resulting in global warming and climate change. To realize low temperature CO2 methanation, various catalysts have been designed, developed, and tested for their catalytic activity at a low temperature. To increase the low-temperature activity of Ni-based catalysts, many methods have been proposed for preparing catalysts with a small Ni particle size [15]. In reality,low a catalyst higher loading usually hasmetal a larger particle [19]. Thisofinterdependence between metal loading particle size hinders the sizeexhibits hinders low the preparation a highly active CO. 2 3to produce highly dispersed Ni-based catalysts
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