Study On Hydrogen Perovskite Catalyst For Steam Reforming Of Methanol

As an important clean energy source,hydrogen energy has the advantages of light weight,high calorific value,and environmental protection.ABO₃perovskite oxide is a new type of material.Compared with other materials,due to its unique electronic structure,it has electricity,Magnetic,optical and chemical characteristics have shown great application prospects in many fields.,The research content are as follows:?1?The La Ni O₃perovskite-type oxide carrier was synthesized by the sol-gel method,and then the Cu O/La Ni O₃catalyst was prepared by the impregnation method,and the catalyst was characterized by XRF,XRD,BET,H₂-TPR and XPS.The influence of the calcination temperature of La Ni O₃perovskite on the structure of Cu O/La Ni O₃catalyst and its performance in hydrogen production from methanol steam reforming was investigated.The results show that the calcination temperature of the carrier mainly affects the surface lattice oxygen vacancies of the catalyst and the interaction between the active components and the carrier.When the calcination temperature of the carrier is 800 ^oC,the content of oxygen vacancies on the surface of the catalyst is large,and the interaction between the active component and the carrier is strong.Therefore,the catalytic steam reforming of methanol has better activity for hydrogen production.?2?The Cu O/La BO₃catalyst was modified by changing the type of B-site element.The results show that the type of B-site element mainly affects the surface lattice oxygen vacancy of the catalyst,the interaction between the active component and the carrier,and its catalytic performance.The four catalysts prepared with different B-site elements showed different performances.Among them,Cu O/La Cr O₃catalyst has a strong interaction between Cu O and the carrier,and there are many lattice oxygen vacancies on the surface,so the catalytic activity is good.When the reaction condition is360 ^oC,the methanol conversion rate can reach 98.6%.?3?The Cu O/ACr O₃catalyst was modified by changing the A-site element ratio.The results showed that the A-site element ratio mainly affected the reduction performance and catalytic performance of the catalyst.When the A-site element is La_0.8Ce_0.2,the catalyst has a lower reduction temperature,so the Cu O/La_0.8Ce_0.2Cr O₃catalyst has the best catalytic performance.At a reaction temperature of 280 ^oC,the amount of water-alcohol substance is 1.2When the methanol gas space velocity is 800 h^-1,the CO content in the reformed gas is lower than the detection range of gas chromatography?less than 0.1ppm?.