Catalytic Cracking Of Model Compounds Of Waste Cooking Oil To Hydrogen And CO₂ Reforming To Syngas

As a kind of waste biomass,waste cooking oil will cause serious water pollution and soil pollution.Carbon dioxide is one of the main gases responsible for the greenhouse effect.The utilization of waste cooking oil and carbon dioxide can not only solve the problems of environmental pollution and energy security,but also further alleviate the greenhouse effect.In this paper,hydrogen and carbon nanotubes（CNTs）were prepared by catalytic cracking of model compound of waste cooking oil（MWCO）and synthesis gas and carbon nanotubes（CNTs）were prepared by reforming of waste cooking oil model compound CO₂.The specific research contents are as follows:（1）Activated carbon（AC）carriers were prepared from MWCO,and catalysts with different Ni/Cu contents were prepared by coprecipitation method for catalytic cracking of MWCO to produce hydrogen and CNTs.The structure and properties of the catalysts were characterized by ICP-OES,BET,XRD,SEM and TPR.The effects of different catalysts,reaction temperature,feed flow rate and reaction time on the reaction were investigated.Among them,20%Ni–10%Cu/AC catalyst showed the best catalytic activity and stability at 850℃,and the instantaneous volume fraction of hydrogen in the gas product reached 41.1%.It was also found that The catalytic effect of Cu on the catalytic cracking of MWCO was not obvious,but the main effect was to dilute the active site of Ni catalyst effectively and increase the contact between the active site and MWCO.The solid carbon products were characterized and analyzed by SEM,TEM,TG and Raman.The results showed that the collected solid carbon products were mainly CNTs with high purity and high graphite degree.（2）With nickel as the active component and La₂O₃as the carrier,10%Ni/La₂O₃,20%Ni/La₂O₃and 30%Ni/La₂O₃catalysts were prepared by co-precipitation method to catalyze CO₂reforming of MWCO for synthesis of syngas and CNTs.The morphology,phase,structure and reducibility of the catalysts were characterized by ICP-OES,BET,XRD and TPR.In the CO₂reforming reaction of MWCO,the feed flow rate of MWCO was 0.04 m L/min and the flow rate of CO₂gas was 20 m L/min.The effects of different catalysts,reaction temperature and reaction time on the reforming reaction were investigated.The 20%Ni/La₂O₃catalyst showed high activity and stability at 750℃,and the hydrogen content in the gas product was 45.6%and the H₂/CO value was 1.69.SEM,TEM,TG and Raman analysis of the collected solid products confirmed that the carbon products in the collected solid products were CNTs with high purity and high graphite degree.