Hydrogen Production From Steam Reforming On Ni/MgO Catalyst

In this paper, as the catalyst, NiO-MgO solid solution catalyzed steam reforming of butanol for hydrogen production. Using coprecipitation method prepared NiO-MgO, impregnation method prepared NiO/MgO and NiO/MgO-m( labeled MgO-m) solid solution, respectively. Moreover, the metal Ni was restored from Ni/NixMg1-xO catalysts at 10% H2/Ar, 650 oC and 1 h. The solid solution were characterized with XRD, N2 adsorption/desorption After reducing, Ni/NiO-MgO, Ni/MgO, Ni/Al2O3 and Ni/MgO-m four kinds of catalysts carried out in a fluidized bed reactor to catalyze butanol steam reforming for producing hydrogen. XRD, temperature programmed oxidation( TPO) and temperature programmed hydrogenation( TPH) technology characterized the catalysts.The results of the solid solution shows that the mesoporous MgO( Mg O-m) as the carrier, could be prepared mesoporous NiO/MgO-m solid solution, which was immersed in the Ni(NO3)2 aqueous solution, and the specific surface area and average pore diameter were 68.12 m2/g and 4.20 nm, respectively. It was about 3.1 times for the NiO/MgO solid solution prepared with common MgO.In four of the prepared catalysts, on the steam reforming of Butanol for hydrogen result shows that the catalyst Ni/MgO-m of the catalytic has a high activity and maximum stability. At T = 550 oC, LHSV = 8 h-1, CC4H9 OH = 4.89 wt%, butanol conversion rate of 92.4%, hydrogen selectivity of was 76.7%, hydrogen yield of 11.07 mol/mol. And, in the reaction of 20 h, Ni/MgO-m resulting catalyst selectivity and yield of hydrogen was not reduced significantly, maintained at 80.0% and 6.2 mol/mol. Due to the high specific surface area had a favor the dispersion of the Ni particle, and reactant and product can be fully diffusion in the duct of catalyst. Consequently, Ni/MgO-m showed a high catalytic activity and stability.After different reaction times, catalyst characterization results that the coke on Ni/MgO-m catalyst was the least and its activity was stable. The desposion of coke was C, CxHy or CxHyOz the same with carbon on the other catalyst.In summary, Ni/MgO-m catalyst were prepared with Ni(NO3)2 that was impregnated into mesoporous MgO carrier which had the highest catalytic activity and stability.