在Pt/HZSM-5双功能催化剂上FCC汽油加氢异构化反应机理及动力学研究

Study on Kinetics and Reaction Mechanism of FCC Gasoline Hydroisomerization over Pt/HZSM-5 Dual Functional Catalyst

在活性趋于稳定的Pt/HZSM-5双功能催化剂上,利用连续流动微反—色谱装置,进行了催化裂化汽油加氢异构化反应机理和动力学的研究.在250～330℃,1.0～3.0MPa反应条件下,考察了催化汽油加氢异构化反应产物分布,按单分子反应机理,建立了催化裂化汽油中烯烃加氢异构化反应网络和动力学模型,计算了反应网络中各步的反应速率常数和活化能.结果表明:Pt/HZSM-5双功能催化剂具有较好的加氢和异构活性,在保证辛烷值不下降的条件下,可使催化裂化汽油中烯烃加氢饱和,达到降低汽油烯烃和提高安定性的目的.

The kinetics and reaction mechanism of FCC gasoline hydroisomerization over the Pt/HZSM\|5 bifunctional catalyst with stable activity have been studied by using a continuous flow microreactor. The distributions of product and reaction network and model of kinetics of FCC gasoline hydroisomerization were obtained at 320 ℃~400 ℃ and 4.5MPa^8.5Mpa. Based on monomolecular reaction mechanism, the rate constants and activation energie of each step were calculated.The results showed that Pt/HZSM\|5 bifunctional catalyst possesses good activity for hydrogenation and isomerization, the olefin concentration of FCC gasoline were decreased and the stability of FCC gasoline was improved by hydrogenation under condition of unchanged octane number.