苯加氢烷基化合成环己基苯催化剂研究

Study on catalysts for synthesis of cyclohexylbenzene by hydroalkylation of benzene

以分子筛为载体,采用等体积浸渍法制备具有双功能的分子筛催化剂。以苯为原料,在双功能催化剂的作用下采用加氢烷基化的方法合成环己基苯(CHB)。考察了不同载体酸性、反应温度、氢气压力和催化剂的金属担载量等因素对反应的影响。实验结果表明:Ru/Hβ双功能催化剂为最佳的催化剂,最佳反应条件为:2.5 MPa氢气压力,200℃下反应4 h。在此条件下苯的转化率可达67.6%,CHB的选择性可达47.8%。催化剂的金属活性和酸性是苯加氢烷基化的关键。

The molecular sieve binary catalyst is prepared by the impregnation method with its molecular sieve as carrier.The catalyst is used for the hydroalkylation of benzene to cyclohexylbenzene （CHB） with the benzene as a raw material.The effects of different carrier acidity,reaction temperature,hydrogen pressure and metal loading are investigated.According to the experimental results,the optimum process conditions are as follows：2.5 MPa of hydrogen pressure,200℃ of temperature and 4 hours of time.The conversion of benzene and the selectivity of CHB are 67.6％ and 47.8％,respectively,under the optimum process conditions.The metal actice and acidic of catalyst are the keys to the hydtoalkylation of benzene.