摘要
采用共沉淀法制备Fe2O3-SiO2 混合氧化物前驱体 ,并对其进行水热改性处理 ,经浸渍(NH4)2S2O8 溶液后再焙烧得S2O82 -/Fe2O3-SiO2 固体酸催化剂。研究了制备条件对催化活性的影响 ,用乙酸/丁醇酯化反应评估该固体酸的催化性能。实验结果显示 ,最佳工艺条件为,n(Fe):n(Si)=1:4 ,150℃水压热处理1h ,在0.5mol·L-1 的(NH4)2S2O8 溶液中浸渍6h ,500℃焙烧3h ,在此条件下乙酸的转化率可达94.11 %。
Through hydrothermal modification of the precursor of Fe 2 O 3 _SiO 2 mixed oxides made from co_precipitation method,S 2 O 82- /Fe 2 O 3 -SiO 2 solid acid catalysts were prepared after being impregnated by(NH 4 ) 2 S 2 O 8 solution and calcined at a certain temperature.The effect of preparation conditions on the catalytic activity was also studied.The catalytic activities of the solid acid were evaluated by esterification of acetic acid and butanol.The experiment results showed the optimal conditions:n(Fe):n(Si)=1:4,concentration of(NH 4 ) 2 S 2 O 8 was0.5mol·L -1 ,impregnation time was6h,calcinations temperation was500℃,and calcinations time was3h.Under these conditions,the conversion of acetic acid reached94.11%.
