Bimetallic Cu-Ni Catalysts derived from Phyllosilicates for Synergistically Catalyzing CO2 and CH4 Dry Reforming.

Abstract

Methane dry reforming reaction offers an attractive route to simultaneously convert two kinds of greenhouse gases into clean fuels and high valuable chemicals. Nevertheless, the inactivation of nickel-based catalysts due to sintering and coking in dry reforming has severely limited its industrial application. In this study, we proposed a step-by-step strategy to prepare a series of bimetallic xCu-Ni/SiO2 catalysts derived from phyllosilicate precursors. The optimized catalyst shows exceptional performance, with no deactivation during the 50-hour stability test, and the CH4 and CO2 conversion were 88.8% and 94.0%, respectively. This was attributed to the synergistic catalysis of Cu-Ni alloy, effectively inhibits coke formation. Additionally, the distribution of copper species between nickel species inhibited the mobility and enlargement of nickel particles and thus enhanced the resistance to sintering. The preparation strategy offers valuable insights for designing and preparing of highly efficient and stable bimetallic catalysts under high-temperature conditions.