摘要
利用沉淀-浸渍法制备了SO42-/ZrO2-T iO2固体酸催化剂(简称SO42-/ZrO2-T iO2催化剂),考察了SO42-/ZrO2-T iO2催化剂的制备条件对苯与1-十二烯烷基化反应的影响,并通过红外光谱、X射线衍射及BET比表面积测定对SO42-/ZrO2-T iO2催化剂结构进行了初步表征。实验结果表明,SO42-/ZrO2-T iO2催化剂具有良好的催化活性;适当的T iO2含量、焙烧温度、焙烧时间和浸渍液硫酸溶液的浓度能提高SO42-/ZrO2-T iO2催化剂的中强酸中心含量,有利于提高直链十二烷基苯(LAB)和2-十二烷基苯(2-LAB)的选择性。优化的SO42-/ZrO2-T iO2催化剂制备条件为:n(Zr)∶n(T i)=1.50、焙烧温度500℃、焙烧时间3.0h、硫酸溶液的浓度2.0m ol/L、室温陈化。在此条件下,1-十二烯的转化率达到99.5%,LAB及2-LAB选择性分别为92.2%和89.3%。
SO4^2-/ZrO2-TiO2 solid acid catalyst for alkylation of benzene and 1-dodecene was prepared by precipitation and impregnation. Effects of preparation conditions on catalyst performance, namely n （Zr） ： n （ Ti ）, calcination temperature, calcination time, concentration of sulfuric acid solution used in impregnation and aging temperature, were studied. The catalyst was characterized by means of IR, XRD and specific surface area analysis. SO4^2-/ZrO2-TiO2 showed good catalytic performance for alkylation. Under optimized preparation conditions： n （Zr） ： n （ Ti ） 1.50, calcination temperature 500℃, calcination time 3.0 h ,concentration of sulphuric acid solution 2.0 mol/L and aging at room temperature, conversion of 1 -dodecene, selectivity to linear dodecylbenzene （ LAB ） and 2-dodecylbenzene （ 2-LAB ） could reach 99.5% ,92.2% and 89.3% ,respectively. Amount of strong acid sites could be increased by adjusting of TiO2 content, concentration of sulfuric acid solution, aging temperature, calcination temperature and calcination time ,which was favorable to selectivities of LAB and 2-LAB.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2006年第5期483-487,共5页
Petrochemical Technology
基金
安徽省高校青年基金资助项目(2003jq134)
