丙酮一步法合成甲基异丁基酮催化剂的失活机理  

Deactivation Mechanism of the Catalyst for One-Step Synthesis of Methyl Isobutyl Ketone from Acetone

作　　者：马龙[1] 马中义[1,2] 公茂金[1] 田艳明[2] 周玮[2] 赵胤[2] 

机构地区：[1]中国石油吉林石化公司化肥厂,吉林吉林132021 [2]中国石油吉林石化公司研究院,吉林吉林132021

出　　处：《石油化工》2011年第5期482-485,共4页Petrochemical Technology

摘　　要：为研究丙酮一步法合成甲基异丁基酮Pd/Al2O3催化剂的失活机理,采用BET,XRD,SEM,O2-TPO等方法,对反应前后的催化剂进行了表征。表征结果表明,反应前后催化剂中的Pd含量没有明显变化,而反应后的催化剂表面织构变化较大,反应后的催化剂孔体积减小、平均孔径增大,Al2O3载体形态由γ型转化为羟基氧化铝的形态;同时,反应后的催化剂表面存在一定的高沸物。因此,催化剂加氢能力降低的主要原因是载体Al2O3形态的变化和催化剂表面包覆的高沸物,造成加氢活性中心减少。The fresh and the spent Pd/Al2O3 catalysts for synthesis of methyl isobutyl ketone from acetone were characterized by means of BET, XRD, SEM and O2-TPO to investigate its deactivation mechanism. The results showed that the Pd contents in both the fresh and the spent catalysts were the same, while the pore volume of the spent catalyst decreased and the average pore diameter enlarged compared to the fresh catalyst. The alumina crystal phase transformed from γ alumina to hydroxyl alumina and the macromolecule byproducts deposited on the spent catalyst surface. Hence, the weakened hydrogenation ability of the catalyst resulted from the decrease of hydrogenation sites, which was caused by the transformation of the alumina crystal phase and the deposition of the macromolecule byproducts.

关 键 词：丙酮 甲基异丁基酮 钯/氧化铝催化剂 失活机理 加氢活性中心 

分 类 号：TQ032.4[化学工程]