The Study On Catalyst Of Glycerol Steam Reforming For Hydrogen Production

In this paper,glycerin is used as the raw material to produce hydrogen by steam reforming in a fixed-bed reactor.The effects of different types of carriers and carrier modifications on the catalytic performance of the catalyst are investigated.The effects of three different regeneration methods on the regeneration performance of the catalyst are described.In this paper,two Ni-based catalysts were prepared with alumina(Al2O3)and attapulgite(ATP)as supports.BET,XRD,H2-TPR,NH3-TPD,and TG were analyzed for the two catalysts,and the catalytic performance of the two catalysts was studied in a fixed-bed reactor.Studies have shown that the lower surface acidity of the ATP carrier makes it have better resistance to carbon deposition and catalytic performance.In addition,the paper investigates the catalyst preparation conditions.The results show that Ni-ATP catalyzes steam reforming of glycerol to produce hydrogen glycerol under the experimental conditions of calcination temperature 700?,calcination time 4h,reaction temperature 600?,WHSV:1h-1,W/G:3/1 The conversion rate reached 90.23%and the hydrogen yield was 59.80%.In this paper,CaO was used as modifier to modify ATP.Using CaO-ATP as the carrier,a Ni-CaO-ATP catalyst was prepared by the impregnation method.Studies have shown that the modification of the carrier by CaO reduces the acidity of the catalyst surface,making the Ni-CaO-ATP catalyst have higher activity,resistance to carbon deposition and life.Under the experimental conditions of reaction temperature of 600?,WHSV of 1h-1,and W/G of 3:1,the conversion of glycerol and the hydrogen yield under the action of Ni-CaO-ATP catalyst reached 93.71%and 83.61%,respectively.In this paper,the deactivation and regeneration of Ni-CaO-ATP catalyst were studied.The results show that carbon deposition is the main cause of catalyst deactivation.The steam regeneration catalyst has the best activity and stability,but the steam regeneration process will consume a large amount of steam,which will increase production costs.The air regeneration method is easy to sinter the active center of the catalyst.The CO2 regeneration method can make full use of greenhouse gases.In addition,the paper examines the number of catalyst regenerations,and research shows that as the number of regenerations increases,the catalyst performance decreases and the deactivation becomes faster.