摘要
以Al3+/(Al3++Mg2+)摩尔比为0.2的水滑石(HT)为载体,采用还原浸渍法制备了负载型Pd-Ce-B/HT催化剂,并将其应用于液相苯酚选择性加氢制环己酮.与Pd-Ce-B/Al2O3,Pd-Ce-B/MgO和Pd-Ce-B/SiO2相比,Pd-Ce-B/HT催化剂具有高活性和高环己酮选择性.5.8%Pd-Ce-B/HT上苯酚的转化率和环己酮的选择性分别达82.0%和80.3%,显示了其潜在的工业化应用前景.根据多种表征结果,初步讨论了催化剂的构效关系以及添加剂Ce3+和载体酸碱性对催化性能的促进作用.
Supported Pd-Ce-B catalysts were prepared by chemical reduction of Pd and Ce ions deposited on hydrotalcite （HT） with an Al^3＋/（Al^3＋ ＋ Mg^2＋ ） molar ratio of 0.2. In the reaction of liquid-phase selective hydrogenation of phenol, the as-prepared Pd-Ce-B/HT catalyst exhibited much higher activity and selectivity for cyclohexanone than Pd-Ce-B/Al2O3, Pd-Ce-B/MgO, and Pd-Ce-B/SiO2. The maximum phenol conversion and selectivity for cyclohexanone over 5.8 % Pd-Ce-B/HT reached 82.0 % and 80.3 %, respectively. Based on the results of various characterizations, the catalyst structure-activity correlation and the promoting effects of the Ce dopant and acidic-basic properties of the support on the catalyst behavior were discussed.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第4期312-316,共5页
基金
国家科技部重大基础研究前期专项(2005CCA01100)
国家自然科学基金(20377031
20603023)
上海市科委启明星计划(05QMX1442)
上海市科委纳米专项基金(0452nm070
0552nm036)
上海市重点学科项目(T0402)
上海市教委项目(05DZ20).
关键词
钯
铈
硼
水滑石
负载型催化剂
苯酚
加氢
环己酮
palladium
cerium
boron
hydrotalcite
supported catalyst
phenol
hydrogenation
cyclohexanone
