Synthesis of Metal Modified Mesoporous Silicas and their Applications on Catalysis
Date Issued
2007
Date
2007
Author(s)
Chang, Ching-Fu
DOI
zh-TW
Abstract
Modified ordered mesoporous silicas were synthesized by the use of amphiphilic di-block copolymers as templates. The hydrophilic end of the copolymers was polyethylene glycol, whereas the hydrophobic end was polymethyl acrylate. By fixing the length of polyethylene glycol, polyacrylate end was constructed through the atom transfer radical polymerization(ATRP). With the use of copolymers PEO-PMA, we have synthesized Al or Ti modified silica mesoporous silicas successfully. With the different ratio of PEO and PMA, the mesostructure of the mesoporous silicas are variable. Due to the modification of Al and Ti into the -Si-O-Si- framework, these porous materials have the Lewis acidity. Modification of amine groups on the polyacrylate end allows the coordination of cobalt ions, which are grafted onto the di-block copolymers. Upon sol-gel process, cobalt oxide nanoparticles was also grouped into the mesoporous silicas. All of these modified mesoporous silicas show good catalytic activity for Friedel Crafts reaction、ammoximaiton of ketones or aldehydes and oxidation of aniline.
Subjects
中孔洞材料
鋁
鈦
鈷
聚乙二醇
聚丙烯酸甲酯
mesoporous
aluminum
coblat
titanium
PEO
PMA
Type
thesis