摘要
将Cr(salen)配合物分别嫁接于介孔SiO2,MCM-41和SBA-15上制备成非均相Schiff碱铬配合物,并用FT-IR,UV-Vis,XRD,N2吸附和元素分析等对非均相铬配合物进行了表征.以30%的H2O2为氧化剂,以非均相铬配合物为催化剂,在无有机溶剂、相转移催化剂和添加剂的条件下,研究了选择性催化氧化苯甲醇合成苯甲醛的反应.结果表明,非均相铬配合物都表现出较好的催化性能.选择不同的介孔载体对非均相铬配合物的催化性能有较大的影响,Cr(salen)/MCM-41配合物显示有最好的催化性能;在优化的反应条件下,苯甲醇转化率可达52.5%,苯甲醛选择性为100%,且该非均相铬配合物重复使用4次后仍保持较好的催化性能.
In order to investigate the effect of different mesoporous supports on the catalytic performance of heterogeneous complexes, three representative siliceous mesoporous materials （SiO2, MCM-41, and SBA-15） were selected as supports to immobilize the same chromium salen Schiff base complex. The coordination structure and textural properties of the heterogeneous complexes were characterized by various physico-chemical measurements such as FT-IR, UV-Vis, XRD, N2 adsorption, and elemental analysis. The heterogeneous complexes were effective catalysts for the selective oxidation of benzyl alcohol to benzaldehyde using 30 % H2O2 as the oxidant, and they all exhibited much better catalytic performance than their homogeneous analogues. Simultaneously, the catalytic performance of the heterogeneous complexes was also closely related to the used supports, and the complex Cr（salen）/MCM-41 exhibited the best catalytic performance. Under the optimal reaction conditions, the conversion of benzyl alcohol could reach 52.5% with 100% of selectivity for benzaldehyde. In addition, the catalytic performance was remained after being reused 4 times.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2007年第12期1101-1106,共6页
基金
国家重点基础研究发展计划(2005CB221402)
国家科技支撑计划重大项目(2006BAC2A08)
关键词
铬
N
N-双水杨醛缩乙二胺配体
介孔载体
非均相配合物
席夫碱
苯甲醇
选择性氧化
苯甲醛
chromium
N, N-bis（salicylideneamino）ethane （salen） ligand
mesoporous support
heterogeneous complex
Schiff base
benzyl alcohol
selective oxidation
benzaldehyde
