Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)催化正己烷异构化反应动力学模型  

Kinetics Model of the n-Hexane Isomerization Catalyzed by Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)

作　　者：张孔远[1] 崔孟达 黄仁强 马亮 刘晨光[1] ZHANG Kongyuan;CUI Mengda;HUANG Renqiang;MA Liang;LIU Chenguang(College of Chemical Engineering,China University of Petroleum,Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)化学工程学院,山东青岛266580

出　　处：《石油学报（石油加工）》2023年第2期300-309,共10页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：采用共沉淀法制备SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3),等体积浸渍法制备Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)固体超强酸催化剂,采用5mL连续固定床反应装置评价了反应温度、反应压力、氢/油体积比和体积空速对Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)催化剂催化正己烷临氢异构化反应活性的影响。进行拟一级动力学模型验证,建立正己烷异构化一级反应网络动力学模型。结果表明:增加反应压力和体积空速,正己烷转化率降低;随着氢/油体积比、反应温度的升高,正己烷转化率提高。在180~200℃范围内,正己烷在Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)催化剂上的临氢异构化反应可以视为简单拟一级可逆反应,反应活化能Ea为81.84kJ/mol,指前因子A为1.57×10^(9)h^(-1);建立的拟一级反应网络动力学模型与实验结果拟合较好,各步反应活化能在76~127kJ/mol之间。SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)was prepared by coprecipitation method and Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)solid superacid catalyst was prepared by isovolumetric impregnation method.The effects of reaction temperature,reaction pressure,hydrogen to oil volume ratio and volume space velocity on the hydroisomerization of n-hexane by Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)catalyst were evaluated using a 5 mL continuous fixed bed reactor.The pseudo first-order kinetic model was verified and a kinetic model of first-order reaction network for n-hexane isomerization was established.The results show that the conversion rate of n-hexane is decreased with the increase of reaction pressure and volume space velocity,and increased with the increase of hydrogen to oil volume ratio and reaction temperature.The hydroisomerization of n-hexane over Pt-SO_(4)^(2-)/ZrO_(2)-Al_(2)O_(3)catalyst at the temperature of180—200℃can be regarded as a simple pseudo-first-order reversible reaction,with the activation energy(Ea)of 81.84kJ/mol and pre-exponential factor(A)of 1.57×10^(9)h^(-1).The kinetic model of pseudo first-order reaction network is well fitted with the experimental results,and the activation energy of each step is between 76and 127kJ/mol.

关 键 词：正己烷 固体超强酸催化剂 临氢异构化 动力学模型 

分 类 号：TQ203.4[化学工程—有机化工]