H_6P_2W_(18)O_(62)·nH_2O/MWCNTs催化剂的制备、表征及其对乙酸正丁酯合成的催化性能  

Preparation,Characterization and Catalytic Performance of H_6P_2W_(18)O_(62)·nH_2O/MWCNTs for n-Butyl Acetate Synthesis

作　　者：曹小华[1,2] 任杰[1] 徐常龙[2] 柳闽生[3] 蓝健[2] 谢宝华[2] 

机构地区：[1]浙江工业大学化学工程与材料学院,浙江杭州310014 [2]九江学院化学与环境工程学院,江西九江332005 [3]南京晓庄学院生物化工与环境工程学院,江苏南京211171

出　　处：《石油学报（石油加工）》2013年第4期612-618,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21161009);江西省自然科学基金项目(20114BAB213002;20122BAB213001);江西省教育厅科技项目(GJJ10626;GJJ11613)资助

摘　　要：以多壁碳纳米管(MWCNTs)为载体,采用浸渍法制备了H6P2W18O62·nH2O/MWCNTs催化剂,对其进行了FT-IR、EDX、XRD、SEM表征,并以乙酸和正丁醇合成乙酸正丁酯为探针反应,考察了催化剂的酸催化性能,以及反应条件和催化剂重复使用次数对酯化率的影响。结果表明,H6P2W18O62·nH2O/MWCNTs催化活性高于单一组分的H6P2W18O62·13H2O和MWCNTs。该酯化反应的最佳条件为磷钨酸负载量50%,催化剂用量(按反应体系总质量计)0.6%,醇/酸摩尔比2,反应温度120℃,反应时间2.0h。此时,酯化率可达97.1%。催化重复使用5次后,酯化率仍可达60.9%。Phosphotungstic acid/multiwalled carbon nanotubes catalyst （H6 P2 W18 O6e . nil20/MWCNTs ） was prepared by dipping acid on MWCNTs in the mixing solution of phosphotungstic acid with Dawson structure, and characterized by FT-IR, EDX, SEM and XRD. The catalyst was applied in the catalytic synthesis of n-butyl acetate （BAC） with acetic acid and n-butanol. The effects of various factors and repeated times of the catalyst on the esterification rate of BAC synthesis were discussed. The results indicated that the catalytic activity of H6P2W18O62· nH2O/MWCNTs catalyst was higher than that of Dawson phosphotungstic acid and rnultiwalled carbon nanotubes alone, with the esterification rate phosphotungstic acid loading amount, up to 97.1% under the optimal conditions of 50% the catalyst amount of 0.6% to the total raw materials amount, 2 of the molar ratio of n-butyl alcohol to acetic acid, the reaction temperature of 120℃, the reaction time of 2.0 h. The catalyst could be reused for 5 times and the esterification rate of n-butyl acetate was still above 60.9 %.

关 键 词：碳纳米管 Dawson结构磷钨酸 催化剂 乙酸正丁酯 

分 类 号：O614[理学—无机化学]