含环氧基团的聚合物微球固载2,2,6,6-四甲基哌啶氮氧自由基催化剂的制备及其催化分子氧氧化苯甲醇

以甲基丙烯酸缩水甘油酯(GMA)为单体,以乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,采用悬浮聚合法制得交联聚甲基丙烯酸缩水甘油酯(CPGMA)微球,然后以4-羟基-2,2,6,6-四甲基哌啶氮氧自由基(4-OH-TEMPO)为试剂,使CPGMA微球表面的环氧基团发生开环反应,从而制得了TEMPO固载化微球TEMPO/CPGMA,考察了制备条件对固载化反应的影响,并采用多种方法对微球TEMPO/CPGMA进行了表征.将微球TEMPO/CPGMA与CuCl组成共催化体系,用于分子氧氧化苯甲醇,考察了反应条件对催化体系性能的影响.结果表明,以含环氧基团的聚合物微球CPGMA为载体,通过开环反应,可...

Full description

Saved in:
Bibliographic Details
Published in催化学报 Vol. 34; no. 9; pp. 1776 - 1786
Main Author 余依玲 高保娇 李艳飞
Format Journal Article
LanguageChinese
Published 中北大学化学工程系,山西太原,030051 2013
Subjects
分子氧
固载
氮氧自由基
聚甲基丙烯酸缩水甘油酯
醇氧化
分子氧
Molecular oxygen
Nitroxide free radical
氮氧自由基
固载
Immobilization
醇氧化
Poly(glycidyl methacrylate)
Alcohol oxidation
聚甲基丙烯酸缩水甘油酯
Online AccessGet full text
ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(12)60651-2

Cover

More Information
Summary:以甲基丙烯酸缩水甘油酯(GMA)为单体,以乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,采用悬浮聚合法制得交联聚甲基丙烯酸缩水甘油酯(CPGMA)微球,然后以4-羟基-2,2,6,6-四甲基哌啶氮氧自由基(4-OH-TEMPO)为试剂,使CPGMA微球表面的环氧基团发生开环反应,从而制得了TEMPO固载化微球TEMPO/CPGMA,考察了制备条件对固载化反应的影响,并采用多种方法对微球TEMPO/CPGMA进行了表征.将微球TEMPO/CPGMA与CuCl组成共催化体系,用于分子氧氧化苯甲醇,考察了反应条件对催化体系性能的影响.结果表明,以含环氧基团的聚合物微球CPGMA为载体,通过开环反应,可成功地实现TEMPO的固载化,开环反应属SN2亲核取代反应,适宜采用溶剂N,N′-二甲基甲酰胺和反应温度85℃.非均相催化剂TEMPO/CPGMA与助催化剂CuCl构成共催化体系,在室温、常压O2条件下可高效地将苯甲醇氧化为苯甲醛,产物选择性和产率分别为100%和90%.主催化剂TEMPO与助催化剂CuCl适宜的摩尔比为1:1.2;主催化剂适宜用量为0.90g.此外,TEMPO/CPGMA固体催化剂具有良好的循环使用性能.
Bibliography:Crosslinked polymer (glycidyl methacrylate) microspheres (CPGMA) were prepared with glycidyl methacrylate as monomer and ethylene dimethacrylate as crosslinker by suspension polymerization. The ring opening reaction between the epoxy groups on the CPGMA microspheres and 4-hydroxy-2,2,6,6-tetramethyl-piperidinyl-1-oxy (4-OH-TEMPO) was carried out to immobilize TEMPO on the polymer microspheres. TEMPO-immobilized microspheres (TEMPO/CPGMA) were obtained and were characterized by several methods. The effects of the main factors in the immobilization were examined so that the reaction conditions were optimized. On this basis, a co-catalyst system was constituted with TEMPO/CPGMA and CuCl and was used in the oxidation reaction of benzyl alcohol by molecular oxygen. The catalytic activity of the co-catalyst system and the effects of the main factors were examined. The experimental results showed that the ring opening reaction of the epoxy group allowed the immobilization of TEMPO to be smoothly realized on the CPGM
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(12)60651-2