摘要
制备了二氧化硅负载的聚钛氨烷-铂-锰双金属络合物。结果表明,该催化剂在常温常压下对苯酚具有较高的催化氢化活性和选择性。在双金属络合物中,缺电子的锰离子作为Lewis酸吸附点对环已酮分子中的羰基具有很强的吸附能力,可明显抑制环己酮在铂金属表面的吸附和进一步氢化。环己酮在终产物中的含量可达49.2％。研究了N/Pt/Mn摩尔比、反应温度、时间和溶剂等对催化活性及选择性的影响。此催化剂有良好的稳定性,重复使用三次后,活性和选择性均未见明显改变。
A new kind of inorganic polymer, viz. silica-supported polytitazane(Ti-N), and its platinum-manganese bimetallic complex(Ti-N-Pt-Mn) were prepared. It was found that the complex was a very active and selective catalyst in the hydrogenation of phenol to cyclohexanone (CON) at room temperature under atmospheric pressure. The electron deficient manganese irons act as Lewis adsorption sites for the C=0 group in the CON molecule.The CON readsorption on to platinum and further hydrogenation were suppressed for the addition of manganese. The selectivity of CON formation amounted to 49.2% in the end product.The effect of various reaction paramerters, such as N/Pt/Mn mole ratio, temperature, reaction time and solvent etc.,on the catalystic activity and selectivity have been studied.The complex can be reused for more than three times without any noticeable loss in activityand selectivity.
出处
《功能高分子学报》
CAS
CSCD
1996年第1期64-70,共7页
Journal of Functional Polymers
关键词
配合物
苯酚
选择性氢化
环己酮
催化剂
Polytitazane-Pt-Mn bimetallic complex, Phenol, Selective hydrogenation, Cyclohexanone
