Ordered mesoporous Ni-La2O3/Al2O3 catalysts towards efficient plasma-assisted dry reforming of methane

Abstract

Plasma-assisted dry reforming of methane reaction provides a promising way to produce syngas with unity H2/CO ratio as one important chemical feedstock. Aiming to establish a match between CH4 and CO2 activation rates to suppress carbon deposition under combining plasma and catalyst, the design of reasonable and efficient catalytic materials is great of importance. Herein, we reported that the addition of La enhanced the reducibility of Ni2+ species and promoted Ni dispersion over the highly ordered mesoporous 10Ni5LaAl-one pot catalyst. In comparison to 10Ni5La/Al prepared by the incipient wetness impregnation (IWI) method and 10NiAl-one pot prepared by one pot solvent evaporation-induced self-assembly (EISA) method, the 10Ni5LaAl-one pot catalyst exhibited the highest catalytic activity for syngas production (H2/CO ratio of 0.98) and the strongest coke-resistance ability in the plasma-assisted DRM reaction. Meanwhile, excellent stability performance was obtained within 90 h for the catalyst owing to the higher discharge power, efficient capacitance and lower apparent activation energy of CO2 under plasma condition. And possible reaction mechanism of the10Ni5LaAl-one pot was proposed during plasma-catalytic DRM process.