K修饰Pd/MgO-Al_2O_3催化剂气相催化丙酮加氢缩合制备MIBK研究  

Study on K Modified Pd/MgO-Al_2O_3 Catalysts for Preparing MIBK From Acetone via Hydrogenation Condensation

作　　者：刘龙[1] 贾慧丽[1] 申延明[1] 

机构地区：[1]沈阳化工大学化工学院,辽宁沈阳110142

出　　处：《辽宁化工》2016年第12期1486-1488,1491,共4页Liaoning Chemical Industry

摘　　要：以PdMgAl水滑石为前体制备了Pd/MgO-Al_2O_3催化剂,再浸渍K_2CO_3制备了K改性的Pd/MgO-Al_2O_3催化剂,并用于丙酮气相一步法合成甲基异丁基酮反应。采用XRD、BET、TPD、TG-DTA等技术表征了催化剂,并测试了常压下丙酮加氢的活性。结果显示,掺加K后催化剂的酸性减低、碱性增加,提高了催化剂的活性,在反应温度140℃,氢酮比为1∶1,液空速为4.8 m L·g_(cat)^(-1)·h^(-1)时,丙酮的转化率达到49%,MIBK的选择性达到70%。稳定性测试结果表明催化剂反应80 h后活性降低,主要由于积碳引起,550℃焙烧再生后催化剂基本恢复到新鲜催化剂的活性。Using PdMgA1 hydrotalcite as precursor, Pd/MgO-Al2O3 catalyst was prepared, and then the catalyst was impregnated by K2CO3 solution to prepare K-modified Pd/MgO-Al2O3 catalyst. The K-modified Pd/MgO-Al2O3 catalyst was used in the one-step synthesis of methyl isobutyl ketone from acetone. The K-modified Pd/MgO-Al2O3 catalyst was characterized by XRD, BET, TPD and TG-DTA. The hydrogenation activity of acetone under atmospheric pressure was tested. The results showed that after doping with K,the acidity of the catalyst was decreased and the basicity was increased,and the activity of the catalyst was increased. When the reaction temperature was 140 ℃, the ratio of hydrogen to ketone was 1： 1, and the liquid space velocity was 4.8 ml·gcat-1·h-1, acetone conversion reached 49% and MIBK selectivity reached 70%. The results of stability test showed that the activity of the catalyst decreased after 80 h, mainly owing to carbon deposition. After being calcined at 550 ℃, the activity of the used catalyst was nearly restored to that of the fresh catalyst.

关 键 词：丙酮 缩合 PD催化剂 甲基异丁基酮 

分 类 号：TQ426[化学工程]