碱处理Hβ分子筛催化苯与乙烯液相烷基化反应  

STUDY ON LIQUID ALKYLATION OF BENZENE WITH ETHYLENE CATALYZED BY ALKALI-TREATED Hβ ZEOLITE

作　　者：刘一达 郭豹 唐仕雄 刘继东[1] 吕建华[1] Liu Yida;Guo Bao;Tang Shixiong;Liu Jidong;LüJianhua(School of Chemical Engineering,Hebei University of Technology,Tianjin 300130)

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《石油炼制与化工》2022年第11期82-88,共7页Petroleum Processing and Petrochemicals

摘　　要：采用不同浓度的氢氧化钠溶液对Hβ分子筛进行碱处理,然后使用X射线衍射、X射线荧光光谱、NH_(3)程序升温脱附等技术进行表征,并用于催化苯与乙烯烷基化反应。结果表明:与Hβ原粉相比,碱处理后的分子筛表现出更高的催化活性,这主要由于改性后Hβ晶体表面上的非晶态颗粒被清除,反应物和产物的扩散效果增强,从而提高了分子筛的催化活性;即使碱液浓度较高造成分子筛结构坍塌,所得碱处理分子筛仍然表现出较好的选择性。其中,采用0.08 mol/L氢氧化钠溶液,在60℃下碱处理60 min所得Hβ分子筛催化苯与乙烯烷基化反应的性能最好,转化率为87.29%,乙苯选择性为91.67%。Hβ zeolites were modified with different concentrations of sodium hydroxide solution and characterized by XRD,XRF,NH_(3)-TPD,SEM,N_(2) adsorption-desorption and other techniques,and used as catalyst in the alkylation reaction of benzene and ethylene.Compared with the original Hβ zeolite,the modified Hβ zeolites showed higher catalytic activity,which was mainly due to the removal of the amorphous particles on the surface of the modified Hβ crystals and the enhancement of the diffusion effect of reactants and products.Even though the structure of zeolite collapsed due to the high concentration of alkali solution,the obtained alkali-treated zeolite still showed good catalytic selectivity.The Hβ zeolite treated in 0.08 mol/L NaOH solution at 60℃for 60 min had the highest catalytic performance,with the ethylene conversion rate of 87.29% and the ethylbenzene selectivity of 91.67%.

关 键 词：HΒ分子筛 碱处理 烷基化 乙苯 乙烯 

分 类 号：TQ241.1[化学工程—有机化工] TQ426