BUT ANAL SELF-CONDENSATION OVER UNSUPPORTED AND SUPPORTED ALKALINE EARTH METAL OXIDES - CATALYST ACTIVATION AND DEACTIVATION MECHANISMS

摘要

Vapor phase butanal self condensation reaction was studied over silica supported and unsupported MgO and SrO. The strong solid base MgO catalyst showed low activity and stability. The silica supported MgO, SrO and MgO-SrO and MgO/HY had significantly higher initial catalytic activity. However, the supported catalysts deactivated quickly at 300 °C due to poisoning by butanoic acid. Increasing the reaction temperature to above 350 °C, the MgO/SiO2 and SrO/SiO2 catalysts became relatively stable and the butanal conversion increased from 17% to 24%. Butanoic acid was no longer detected in the effluent at these higher temperatures.