焙烧温度对HZSM-5催化剂催化环己烯水合反应性能的影响  

Effects of Calcination Temperature on Catalytic Performances of HZSM-5 Zeolites in Hydration of Cyclohexene

作　　者：石宇飞[1] 刘杨青[1] 魏会娟[1] 王向宇[1] 

机构地区：[1]郑州大学化学与分子工程学院工业催化研究所,河南郑州450052

出　　处：《石油化工》2013年第12期1373-1377,共5页Petrochemical Technology

基　　金：河南省杰出人才创新基金项目(No.0221001200)

摘　　要：采用水热法在无胺体系中制备了NaZSM-5分子筛,用硝酸铵进行离子交换,并在300～ 550℃下焙烧制得HZSM-5催化剂.考察了焙烧温度对HZSM-5催化剂催化环己烯水合制环己醇反应性能的影响;采用XRD、FTIR、NH3-TPD和低温N2吸附-脱附等技术,对不同焙烧温度下制备的HZSM-5催化剂进行了结构表征.实验结果表明,焙烧温度对HZSM-5催化剂的性能影响显著,在最佳温度400℃下焙烧时,HZSM-5催化剂的微孔比表面积高达265m2/g,强酸酸量为4.46 mmol/g,环己烯的转化率达14.0％,环己醇的选择性为83.3％.随焙烧温度的升高,HZSM-5催化剂的酸量逐渐减少,尤其是强酸量减少较明显,这是其催化环己烯水合反应活性降低的主要原因.NaZSM-5 zeolite powder was synthesized in an amine-free system by hydrothermal method,and HZSM-5 catalysts were prepared by ion exchange with ammonium nitrate and then calcination in the temperature range of 300-550 ℃.The effects of calcination temperature on the performances of the HZSM-5 catalysts in the hydration of cyclohexene were studied.The HZSM-5 catalysts were characterized by means of XRD,FTIR,NH3-TPD and N2 adsorption-desorption.The results showed that the calcination temperature had the evident influence on the performance of the HZSM-5 catalysts.The sample HZSM-5 calcined at 400 ℃ exhibited the largest micropore specific surface area（265 m2/g） and high strong acidity（4.46 mmol/g）,and the conversion of cyclohexene and the selectivity to cyclohexanol reached 14.0％ and 83.3％,respectively.With the calcination temperature rise,the acid sites on the HZSM-5 catalysts gradually reduced,especially the strong acid sites,which was the main reason for the decrease of the catalyst activity in the hydration.

关 键 词：环己烯 环己醇 焙烧温度 HZSM-5催化剂 无胺法 

分 类 号：TQ032.41[化学工程]