Catalytic methanation over nanoparticle heterostructure of Ru/Fe/Ce/ γ-Al_2O_3 catalyst: Performance and characterisation

摘要

A novel trimetal-oxides (Ru/Fe/Ce) supported on gamma-Al2O3 catalyst was synthesised by simple impreg-nation method and the activity was investigated at atmospheric pressure. The results showed that Ru/Fe/ Ce (5:10:85)/gamma-Al2O3 catalyst calcined at 1000 degrees C for 5 h was effective and gave a 97.20% of CO2 conversion at 275 degrees C with 93.5% of CH4 formation. The catalyst possesses medium-strength basic sites with the best reduction temperature of 200 degrees C. The mesoporous structure was covered with small, dispersed particles of spherical in shape. The catalyst is formed by nanoparticles below 10 nm with a surface area of 51 m(2)/g. The physicochemical analyses showed that the active sites of the potential catalyst Ru/Fe/Ce (5:10:85)/gamma-Al2O3 are RuO2 (tetragonal), Fe2O3 (rhombohedral), gamma-Al2O3 (cubic), and CeO2 (cubic), with a good distribution on the catalyst surface. (c) 2020 Elsevier Ltd. All rights reserved.