Deactivation control in CO2 reforming of methane over Ni–Mg–Al catalyst

Abstract

In the present work, appropriate reaction conditions were found to control the catalyst deactivation in the CO2 reforming of methane over Ni–Mg–Al catalyst. Experiments with variable CO2/CH4 ratio showed that the carbon deposition and the sintering of the catalyst decrease with increasing CO2/CH4 ratio. The carbon deposition was controlled at CO2/CH4 = 2, whereas a strong deactivation was observed for a ratio of CO2/CH4 < 1. The experiments with variable space time and fixed CO2/CH4 ratio showed that a shorter space time favors both the carbon deposition control and enhances the resistance of the catalyst to sintering. These results are supported by XRD, TPO and Raman Spectroscopy analyses. Catalyst presented high stability with the time-on-stream in the reaction at 700 °C, CO2/CH4 = 2, and space time of 1.2 g h/mol. The proper reaction conditions are suitable for high CO2 content feed.