CO2 methanation catalyzed by oriented MoS2 nanoplatelets supported on few layers graphene

Abstract

Powders of molybdenum disulfide platelets strongly grafted on graphene have been prepared by pyrolysis of ammonium alginate containing adsorbed various proportions of (NH)MoS. After pyrolysis, formation of MoS supported on graphene was determined by XRD and electron microscopy and spectroscopic techniques. MoS/G exhibits catalytic activity for the methanation of CO, the performance being optimal at intermediate loadings. The catalytic activity of sharply contrasts with that of bulk MoS that promotes the reverse water gas shift, affording CO as the main product. Characterization of the spent MoS/G catalyst shows the partial conversion of external MoS into MoO. Comparison of the catalytic activity of MoS/G with that of MoO/G shows that the latter is less efficient, but more selective for CO methanation.