CO_2 methanation over ordered mesoporous NiRu-doped CaO-Al_2O_3 nanocomposites with enhanced catalytic performance

摘要

The ordered mesoporous NiRu-doped CaO-Al2O3 nanocomposites were synthesized via a facile evaporation-induced self-assembly method for CO2 methanation. Metallic Ni and Ru species retained the single-component heterostructure rather than NiRu alloy over the 600 degrees C-reduced catalysts. Owing to the synergistic effect of bimetallic Ni Ru as well as the improved H-2 and CO2 chemisorption capacities after the addition of Ru and CaO promoters, the ordered mesoporous 10N1R2C-OMA catalyst exhibited enhanced catalytic activity and selectivity, which achieved the maximum CO2 conversion of 83.8% and CH4 selectivity of 100% at 380 degrees C, 0.1 MPa, 30000 mL g(-1) h(-1). In a 550 degrees C-109 h-lifetime test, the ordered mesoporous 10N1R2C-OMA catalyst showed high stability and superior anti-sintering property due to the confinement effect of the ordered mesostructure. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.