摘要
制备了一系列金属氧化物MxOy(M =Al,Fe ,Cr,Mn ,Ti)促进的S2 O82 -/ZrO2 -MxOy 固体超强酸催化剂 .用乙酸和正丁醇的酯化反应研究了制备条件对催化剂活性的影响 .实验结果表明 ,催化剂对酯化反应有很高的催化活性 ,添加不同的金属氧化物对催化剂的酯化反应催化活性有不同的影响 ,其中Cr含量为 0 .5 %的催化剂S2 O82 -/ZrO2 -Cr2 O3 对乙酸和正丁醇的酯化反应具有很高的催化活性 ,乙酸的转化率高达 86 .1%,而在相同条件下 ,不加催化剂时乙酸的转化率仅为 2 6 .9%,制备条件对催化剂活性影响很大 .通过X射线衍射分析(XRD)证实 ,催化剂中ZrO2 主要以四方晶相 (Tetragonalphase)存在 ,少量以单斜晶相 (Monoclinicphase)存在 ,T相和S2 O82 -是保证催化剂活性的关键因素 .
A series of new type of solid superacid catalysts S 2O 8 2- /ZrO 2-M xO y (M=Al,Fe,Cr,Mn,Ti) by M xO y promoted was prepared successfully. Study of the catalytic activity was affected by preparated conditions using esterification reaction of aceticid and n-butanol .Experimental results showed that S 2O 8 2- /ZrO 2- M xO y had higher catalytic activity for the esterification reaction and different M xO y on the catalyst had different effect. It was found that S 2O 8 2- /ZrO 2-M xO y (Cr%=0.5%) had highest catalytic activity and the conversion of aceticid is over 86.1% ,under the same reaction conditions ,the conversion of aceticid is only 26.9% without the catalyst ,influence of preparation conditions on the catalytic activity was very great .Most of the crystal structure of ZrO 2 on the catalysts were tetragoral phase and only few were monoclinic phase by XRD analysis. Tetragoral phase and S 2O 8 2- were the key factors that guaranteed the catalytic activity.
出处
《湖北民族学院学报（自然科学版）》
CAS
2002年第1期86-88,共3页
Journal of Hubei Minzu University(Natural Science Edition)
基金
湖北省教育厅重点项目 ( 2 0 0 0A0 90 0 9)
