摘要
采用浸渍法制备了一系列负载型催化剂,用于催化乙酸(AA)与异丁酸(IBA)酮化反应合成甲基异丙基酮(MIPK)。通过催化剂性能评价,筛选出较好的催化剂CeO2-TiO2/SiO2。用SEM、XRD、BET等方法对CeO2-TiO2/SiO2进行了表征。分别考察了不同反应温度与时间、原料组成、及进料空速等因素对反应活性和选择性的影响。结果表明:CeO2-TiO2/SiO2催化剂可有效催化AA与IBA催化合成MIPK,并且在450℃获得MIPK最高收率,450℃以后催化活性呈下降趋势。控制原料液相进料空速LHSV为0.5h-1,IBA与AA进料物质的量比为1∶1.7,水占原料的质量分数为10%,该催化剂于450℃连续反应30d后,异丁酸转化率由第1d的96.4%下降为82.6%,MIPK的收率由第1d的79.2%下降为70.5%。
By use of impregnation method, a series of supported catalysts had been prepared and their catalytic properties evaluated in the ketonization of isobutyric acid （IBA） and acetic acid （AA） to yield methyl isopropyl ketone （MIPK）. The suitable catalyst CeO2--TiO2/SiO2 was characterized by SEM, XRD, and BET in detail. The effects of reaction conditions, such as temperature, time, feed ratio and space velocity in CeOz- TiO2/SiO2 catalyzed reaction on IBA conversion and MIPK selectivity were investigated system- atically. The results showed that. CeOz- TiOz/SiOz is an effective catalyst in the catalyzed reaction of IBA and AA to produce MIPK with highest yield at 450＇C and a downward trend above 450~C. At 450＂C, feed LHSV 0.5h-1 , n （IBA） ＂ n （AA） as 1 ： 1.7, containing 10% water, the reaction carried on for 30 days successively and the conversion of IBA and the yield of MIPK dropped from 96.4% and 79.2% at the first day, to 82.6% and 70.5% at the thirty day respectively, which showed this catalyst had desirable stability.
出处
《常州大学学报（自然科学版）》
CAS
2011年第2期11-15,共5页
Journal of Changzhou University：Natural Science Edition
关键词
甲基异丙基酮
异丁酸
乙酸
酮化反应
催化剂
Methyl isopropyl ketone
isobutyric acid
acetic acid
ketonization
supported catalyst
