Hβ沸石催化合成2-叔丁基对甲酚

合成了n(S iO2)/n(A l2O3)分别为20、25和38的Hβ沸石,并用XRD和NH3-TPD对其物相和酸性质进行了表征。以Hβ沸石为催化剂,在固定床反应器上考察了对甲酚与甲基叔丁基醚(MTBE)合成2-叔丁基对甲酚的反应,讨论了反应温度、液时空速(WHSV)、MTBE与对甲酚的配比和Hβ沸石的n(S iO2)/n(A l2O3)对转化率和收率的影响,最优反应条件为:Hβ〔n(S iO2)/n(A l2O3)=20〕为催化剂,反应温度120℃,n(MTBE)/n(对甲酚)=1.5,液时空速1.02 mL/h,对甲酚转化率为68%,2-叔丁基对甲酚的收率为64%。

Preparation of 2-t-Butyl-p-cresol Catalyzed by Hβ Zeolite

Hβ zeolites with n(SiO_2)/n(Al_2O_3)=20,25 and 38 were synthesized and their properties were characterized by XRD and NH_3-TPD.Preparation of 2-t-butyl-p-cresol through the t-butylation of p-cresol with methyl t-butyl ether(MTBE) catalyzed by Hβ zeolite was investigated.Effects of temperature,weight hourly space velocity(WHSV),feed ratio(n(MTBE)/n(p-cresol)) and the n(SiO_2)/n(Al_2O_3) ratio of Hβ zeolite on p-cresol conversion and product selectivity were studied.Thus,with Hβ(n(SiO_2)/n(Al_2O_3)=20) as catalyst,the optimum reaction conditions were n(MTBE)/n(p-cresol)=1.5,WHSV=1.02 mL/h and temperature=120 ℃.Conversion of p-cresol was 68% and yield of 2-t-butyl-p-cresol was 64%.