改性L沸石催化苯酚羟基化反应的应用  

Application of Modificated L Zeolite on Phenol Hydroxylation

作　　者：陈希强[1] 贾爱忠[1] 刘双喜[1] 

机构地区：[1]南开大学新催化材料科学研究所,天津300071

出　　处：《分子催化》2009年第4期313-317,共5页Journal of Molecular Catalysis(China)

摘　　要：以L沸石为载体,分别采用浸渍法和离子交换法制备了Cu/L催化剂,并应用于苯酚羟基化反应.在苯酚与双氧水摩尔比等于3的条件下详细考察了反应时间、反应温度、L沸石酸碱性以及Cu的负载量和负载方法等因素对反应的影响.结果表明:采用浸渍法制备的催化剂比离子交换法制备的催化剂具有更高的活性,而且增加催化剂酸量或者升高反应温度均有利于提高苯酚转化.在最佳反应条件下,反应2h苯酚转化率为24.0%,苯二酚选择性为71.4%,其中n(邻苯二酚)/n(对苯二酚)为1.22.The catalysts of phenol hydroxylation were prepared by modifying L zeolite with copper. Their activities were investigated by using 30% H2O2 aqueous solution as oxidant when the reactants ratio of n（phenol）/n（ H2O2） is 3. The factors, including reaction time, reaction temperature, acid content of supports, loading method and Cu content were investigated. The results indicate that the impregnated catalyst has a higher activity than that of ion-exchanged catalyst, and the conversion of phenol increases with increasing the amount of acid content in L zeolite and/or increasing the reaction temperature. Under optimal reaction conditions, the reaction can be completed in 2 hours, the conversion of phenol is 24.0% and the selectivity of dihydroxybenzenes is 71.4% , the ratio of n（CAT） /n（HQ） is about 1.22.

关 键 词：L沸石 改性 双氧水 苯酚 羟基化 

分 类 号：O643.32[理学—物理化学]