Catalytic Oxidation And Reforming Of Methanol To Produce Hydrogen

The process—catalytic oxidation and reforming of methanol(CORM), which combines partial oxidation of methanol (POM) with steam reforming of methanol (SRM) to form thermal coupling, can solve the problems that it need outer heat in SRM reaction and contents lower H₂ in POM reaction. The main purpose of this reseach lies in designing and manufacturing the catalysts which possess good performance to the reaction, studying the technical conditions of the reaction.Many factors including preparation method, the pH value of the solutions, calcinated temperature and reduction meihod were investigated during the preparation of catalysts, the better preparation method is co-precipitation under pH=6.7-9.0, at 450-550℃ calcinated temperature. To the SRM reaction, different reduction method influenced the activity of the catalysts and the better was H₂ reductioa To the CORM reaction, there was not obvious difference using the two methods to the activity of the catalysts, but it was better to the reaction using methanol and water gas as a reducer, which can omit the H₂ reduction process.The series Cu/Zn/Al catalysts have been studied for the SRM reaction, the results showed that these Cu/Zn based catalysts had high activity for the reaction, high selectivity for H₂ and CO₂, low content of CO(<1%), the performance of Cu₆₀Zn₃₀Al₁₀ and Cu₆₀Zn₃₀Al₅Ce₅ were better than those of others. The better reaction conditions of the reaction by using Cu₆₀Zn₃₀Al₅Ce₅ catalyst were follow: temperature is 260℃, ratio of H₂O:CH₃OH is 1-1.2: 1 , liquid feed flow is 5ml/h. Under these conditions, the conversion of methanol is over 98%.The technical conditions of the CORM reaction were studied by using Cu₆₀Zn₃₀Al₅Ce₅ catalyst. The reaction carried out at 1atm and 240℃, at CH₃OH:H₂O:O2=1:0.8:0.25, the results showed that the conversion of methanol is 97.75%, the yield of H₂ is 0.3632mol/hg, the content of CO is 1.78%.