알루미늄과 헤테로폴리산으로 개질된 메조포러스 실리카 상에서의 AKD 합성

Abstract

The commercial process of AKD synthesis has the environmental problems that poisonous materials such as ethyl amine and hydrochloric acid are used and produced, and has a drawback due to multiple process. To overcome these problems, the catalytic dehydration reaction over mesoporous silica was performed. Among the various mesoporous silicas with different pore size and structure, SBA-15 showed the best activity because of good mass transfer caused by large size pore and two dimensional hexagonal array structure. However, other mesoporous silica such as MCM-41, MCM-48 and MCF gave poor mass transfer due to its typical pore structure resulting in the production of byproducts such as stearic anhydride and alkene. Acid strength of silanol group which act as active site could be controlled by incorporating Al into the wall of SBA-15. This could make the electronic effect on Bro¨n sted acid site of silanol group resulting in the increase of the AKD yield. The reaction temperature was lowered by about 100 ℃ maintaining the yield of AKD by supporting 5 wt% of heteropoly acid to SBA-15.