A Bi-functional Catalyst Based On La₂O₃Supported Metals For Hydrogen Production From Sorption-enhanced Reforming Of Glycerol

With the rapid consumption of fossil fuels, the energy problem and environmental crisisis becoming more and more serious. It is necessary to find an efficient and clean energysource. Compared with the fossil fuels, H2only produces H2O in combustion as fuel, withoutgreenhouse gas, such as CO2, CH4, CO and other harmful gas, and without snoot and otherparticles, which is beneficial for relieving the increasingly serious environmental crisis. Butthe raw material of hydrogen production still depends on fossil energy. Therefore, researcherspay close attention on the development of new hydrogen production process. Hydrogenproduction by biomass is sustainable due to zero CO2emissions, which can effectivelyalleviate environmental crisis and energy problems. Along with the large-scale production ofbiodiesel by ester exchange method, glycerin is produced as10%(mol) by-product. Turningglycerin into hydrogen can effectively reduce the cost of biodiesel and improve sustainabilityin the process of hydrogen production.In the process of hydrogen production from steam reforming, CO2adsorbent introducedis favorable for hydrogen production reaction to obtain high purity hydrogen; at the same time,CO2capture facilitates concentration emissions, and effectively reduce carbon emissions. Inthis work, we researched the synthetic method of Ir and Ni catalysts supported on La2O3,studied CO2adsorption performance of La oxide, optimized the catalyst performance, andexplored the relationship between reforming catalytic properties and adsorption properties.The materials possess dual-function of catalytic reforming and CO2adsorption, whichsimplify the design of sorption enhanced reforming process.We studied the effcet of alkaline earth metal Ca modifications, Ir loading and reactionatmosphere on adsorption performance of La2O3as supporter, and got the optimal carrier ofCO2adsorption through experiment optimization. Through OSRG and SRG performanceresearch of the Ir catalyst, we confirmed that the correlation between the CO2adsorption andcatalytic properties. SE-SRG experiments employing optimal catalysts proved theadsorption and catalytic functions.Ni catalysts was prepared in the same way. Through studying adsorption and catalyticperformance of the catalysts, we got the catalyst with the optimal combination which performance excellently in the SE-SRG reaction.