摘要
采用十二烷基苯磺酸钠(SDBS)-乙醇-环己烷O/W微乳体系制备固体超强酸SO24-/SnO2-Ta2O5催化剂,对该催化剂进行傅里叶变换红外光谱、热重、X射线衍射表征,对催化剂的制备条件进行正交实验优化,并进行稳定性考察。结果表明,催化剂的最佳制备条件为:SnCl4浓度0.1mol/L、SnCl4溶液/SDBS/乙醇/环己烷质量比500∶1∶0.5∶15、Ta2O5/SnO2质量比6%、陈化时间24h、浸渍液硫酸浓度3.0mol/L、焙烧温度550℃、焙烧时间3h。将此条件下制备的SO24-/SnO2-Ta2O5用于催化乙酸与正丁醇的酯化探针反应,酯化率为99.3%。与常规水体系制备的催化剂相比,SDBS的O/W微乳体系有利于催化剂活性、稳定性的提高。
A type of solid superacid catalyst SO2-4/SnO2-Ta2O5 was prepared by O/W micro-emulsion method in SDBS/ethanol/cyclohexane system,and the physicochemical properties of the prepared solid superacid samples were characterized by XRD,FT-IR and TG-DTA.The catalyst preparation conditions was optimized by orthogonal experiment and the optimum conditions were obtained as follows： a SnCl4 solution concentration of 0.10 mol/L,the mass ratios of SnCl4 solution∶SDBS∶ethanol∶cyclohexane were 500∶1∶0.5∶15,Ta2O5/SnCl4 mass ratio of 0.06,an aging time of 24 h,the concentration of sulphuric acid impregnating solution was 3.0 mol/L and calcination at 550 ℃ for 3 h.The catalytic performance of this SO2-4/SnO2-Ta2O5 catalyst prepared under optimum conditions was evaluated using esterification of acetic acid and n-butanol as probe reaction,its esterification rate reached 99.3%.As compared with catalyst prepared in conventional water system,catalyst prepared in SDBS micro-emulsion system exhibited better catalytic activity and stability.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2012年第10期22-28,共7页
Petroleum Processing and Petrochemicals
基金
广东肇庆市科技计划项目(2009G013
20100C001)
肇庆市科技创新计划项目(2011G28)
肇庆学院青年项目(201110)
关键词
十二烷基苯磺酸钠
微乳法
固体超强酸
制备
表征
sodium dodecyl benzene sulfonate（SDBS）
micro-emulsion method
solid superacid
preparation
characterization
