Production of CO-rich hydrogen gas from glycerol dry reforming over La-promoted Ni/Al_2O_3 catalyst

摘要

Dry reforming of glycerol has been earned out over alumina-supported Ni catalyst promoted with lanthanum. The catalysts were characterized using EDX, liquid N_2 adsorption, XRD technique as well as temperature-programmed reduction. Significantly, catalytic glycerol dry reforming under atmospheric pressure and at reaction temperature of 1023 K employing 3 wt%La-Ni/Al_2O_3 catalyst yielded H_2, CO and CH_4 as main gaseous products with H_2:CO < 2.0. Post reaction, XRD analysis of used catalysts showed carbon deposition during glycerol dry reforming. Consequently, BET surface area measurement for used catalysts yielded 10-21% area reduction. Temperature-programmed gasification studies with O_2 as a gasification agent has revealed that La promotion managed to reduce carbon laydown (up to 20% improvement). In comparison, the unpromoted Ni/Al_2O_3 catalyst exhibited the highest carbon deposition (circa 33.0 wt%).