MgO催化剂上甲醇分解反应机理的研究

Studies on Mechanism of MeOH Decomposition over MgO Catalyst

自Greenler等用IR光谱研究了甲醇在氧化铝上的分解反应后,对各种氧化物表面上甲醇的吸附及反应的IR光谱、TPD及NMR研究已有较多报道.田丸等研究了酸性氧化铬表面上甲醇分解反应机理,认为甲醇首先形成甲氧基吸附态,然后变成甲酸根吸附态,再进一步分解为H2、CO、H2O及CO2,并认为稳定的吸附态甲酸根离子在甲醇气氛下更易于分解为产物.本文对碱性MgO表面上甲醇分解反应机理进行了探讨.

Mechanism of MeOH decomposition over MgO catalyst was studied with IR spectra and 13C isotopic techniques. It is found that MeOH forms formate ions over MgO at 300℃ ,and then decomposes to CO and H2. The decomposition of formate ions becomes the rate controlling step in MeOH decomposition over MgO.