Study On Deactivation Of Zeolite Catalysts For Ethanol Dehydration To Ethylene In Diluted Aqueous Solution

In this work, catalytic dehydration of ethanol has been studied in details. The optimum catalysts were chosen. The effects of bulk structure and surface component of catalysts on the catalytic performance were investigated. Activity and stability have been present. The performance of catalytic deactivation and regeneration has also been researched.The main contents of this paper are as follows:First, by means of XRD, Al MAS NMR, N₂-adsorption techniques, the results showed that the stability of catalyst was improved with increasing content of the octahedral aluminum.Second, activity experiments of catalyst during aqueous ethanol dehydration to ethylene were carried out in a fixed-bed reactor, the time of reaction was 1000 hours. The results showed that the catalyst had high activity and stability for aqueous ethanol dehydration.Third, by means of XRD, N₂ adsorption techniques, TG, IR and MAS NMR,the results showed that deactivation of catalyst due to the coke formed on the catalyst surface which blocked the pore mouth of zeolite channels for ethanol dehydration. Regeneration of catalyst was putted on appropriate temperature, the results indicated that the regenerated catalyst had high activity and stability for aqueous ethanol dehydration.