Reinforcement of methanol catalytic reforming for hydrogen production through Ru-based carbon-coated CeO2 catalyst

Abstract

Methanol steam reforming for hydrogen production is a highly promising energy technology, due to the high hydrogen intensity of methanol and the appendant hydrogen capture from water. In order to reinforce the hydrogen yield in methanol steam reforming reaction, a series of Ru-based carbon-coated CeO2 catalysts were prepared in this work, using glucose, cellulose and activated carbon as different carbon sources via a hydrothermal method. The results showed that the Ru/CG-CeO2 (glucose) catalyst exhibited a superior catalytic performance at the reaction temperature of 400 °C, with a higher hydrogen production rate (0.276 mol/h) than Ru/CC-CeO2 (cellulose, 0.230 mol/h) and Ru/CA-CeO2 (activated carbon, 0.253 mol/h) catalysts. This was attributed to the synergistic effect between CeO2 and carbon, where the carbon layer formed by glucose enhanced the interaction between the active component and the CeO2 support, which also facilitated the electron transfer effects and resulted in a large amount of oxygen vacancies for Ru/CG-CeO2. This led to a strong adsorption capacity for CO and oxygen-containing species derived from the substrate, thereby improving hydrogen production. Additionally, the catalyst stability and the resistance to carbon deposition were evaluated for all the three catalysts, and Ru/CG-CeO2 catalyst also demonstrated a superior stability and anti-carbon deposition capability.