Preformed precursor of microporous aluminophosphate coating on mesoporous SBA-15: synthesis, characterization, and catalytic property for selective O-methylation of catechol.
The synthesis of mesoporous SBA-15 coated with the preformed precursor of microporous aluminophosphate (AlPO) has been reported. The physicochemical properties of the coated samples were investigated by using XRD, FT-IR, N(2)-adsorption, ICP, (29)Si MAS NMR, NH(3)-TPD and CO(2)-TPD. The characterization results suggest that the nanometer-scaled zeolite units are present on the wall surface of SBA-15, thus bringing the weak acid-base characteristics to the resulting mesoporous materials, and that the acid-base properties of these materials can be modified by the aging treatment in glycol. Moreover, vapor-phase O-methylation of catechol with methanol has been studied on these coated samples as catalysts. It is found that the coated sample bearing suitable weak acid-base sites exhibits the relatively high activity and selectivity to guaiacol.
Liao
Xiangzhou
X
College of Chemistry, Jilin University, Changchun, 130023, China.
Zhou
Zhou
Z
Wang
Zhenlu
Z
Zou
Xiujing
X
Liu
Gang
G
Jia
Mingjun
M
Zhang
Wenxiang
W