摘要
采用直接合成法合成K6[MnCu(H2O)W11O39],K5[MnFe(H2O)W11O39],K6[MnCo(H2O)W11O39],K6[MnZnH2(O)W11O39],K6[MnNi(H2O)W11O39],K6[MnCd(H2O)W11O39]等6种过渡金属取代的钨锰杂多酸盐,利用红外光谱、紫外光谱对合成产物的结构进行了表征。结果表明,6种杂多阴离子具有Keggin结构。利用酯化反应考察了所合成催化剂的催化活性,并且确定了最佳催化反应条件:酸醇物质的量比1∶1,催化剂用量占原料总量的1.5%,反应时间4h,反应温度控制在120℃。结果表明,过渡金属取代钨锰三元杂多酸对乙酸正丁酯的催化产率95%以上。
Six kinds of transition metal substituted tungstomangaous heteropoly acids with Keggin structure such as K6[MnCu（H2O）W11O39], K5[MnFe（H2O）Wn039], K5[MnCo（H2O）W11039], K6[MnZnH2（O）W11O339], K6[MnNi（H2O）WH039], K6[MnCd（H2O） W11O39]are synthesized by direct synthesis technology and structures are characterized by IR and UV. The results show that the com- pounds have Keggin structure. The catalytic activity is investigated by esterification and the optimum reaction conditions are obtained as following： the molar ratio of acetic acid to n-butanol is 1：1, the dosage of catalyst is 1.5% of the materials gross, the reaction temperature is 120℃ and the reaction time is 4 h. Under the optimum conditions, the yield of n-butyl acetate is more than 95%.
出处
《化学工业与工程技术》
CAS
2012年第6期22-26,共5页
Journal of Chemical Industry & Engineering
关键词
三元杂多酸盐
乙酸正丁酯
催化活性
Ternary heteropoly acid
n-Butyl acetate
Catalytic activity
