Catalytic Reaction of Methanol and Cyclohexanol over MgO Catalyst

• Main Authors: Yang feng-zhang, 楊豐彰
• Other Authors: Wang fey-long
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/09962583063171568388

碩士 === 靜宜大學 === 應用化學系 === 87 === This paper was investigated for the methylation of cyclohexanol over MgO catalysts using methanol as a methylation agent . Using bare MgO as a catalyst , the reaction produced 2-methyl cyclohexanol as main product and the yield of that was 31% at 400℃. After adding Ag to MgO,(Ag (0.05wt%)/MgO) the catalysts activity increased, to which of 2-methyl cyclohexanol raech to 37% . The activity of Ag(0.05wt%)/MgO was further improved by adding Cs, the yield of 2-methyl cyclohexanol increased to 46% , as Cs(0.01wt%)-Ag (0.05wt%)/MgO was used as a catalyst. Prolong the contact time or raise the reaction temperature decrease the selectivity to 2-methyl cyclohexanol , owing to the 2-methyl cyclohexanol may further react with methanol to form 2,6-dimethyl phenol and 2,4,6-trimethyl phenol . The BET measurement and TPD spectra indicate that loading of Cs increase both the surface areas and the acid amount of the catalyst . The FT-IR spectra indicate that the methanol obsorbed on the surface of the catalyst was easy to lose its H of O-H groups to form H3C-O species , which can react with cyclohexanol to form 2-methyl cyclohexanol at 400℃.