High dispersion of heteropolyacid nanoparticles on hydrothermally Cs-modified three-dimensionally ordered macroporous SiO2 with excellent selectivity in methacrolein oxidation  

作　　者：Heng Zhang Junqi Liu Chenyuan Liu Tingting Wang Wancheng Zhu 

机构地区：[1]School of Chemistry and Chemical Engineering,Qufu Normal University,Qufu 273165,China

出　　处：《Chinese Journal of Chemical Engineering》2020年第11期2785-2791,共7页中国化学工程学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(21206179);the Natural Science Foundation of Shandong Province(ZR2018MB033)。

摘　　要：Heteropolyacid nanoparticles(NPs)were supported on Cs-modified three-dimensionally ordered macroporous(3DOM)SiO2 and used as the catalyst for the oxidation of methacrolein(MAL)to methacrylic acid(MAA).Hydrothermal treatment and incipient wetness impregnation were employed respectively for the Cs-modification.It was found that hydrothermal Cs-modification of 3DOM SiO2 promoted the dispersion of the supported heteropolyacid,which showed an average particle size of 5.2 nm,much smaller than that(17.6 nm)on the Csmodified 3DOM SiO2 prepared by incipient wetness impregnation.The effects of hydrothermal treatment on the structure and catalytic performance of the catalyst were investigated.Results showed that the ion exchange between Cs+and the surface silanol groups on 3DOM SiO2 was promoted with the increase of the hydrothermal temperature.Meanwhile,Cs-modification helped the heteropolyacid to retain intact Keggin structure,inhibiting the formation of MoO3.Highly dispersed heteropolyacid NPs with enhanced structural stability exhibited excellent selectivity to MAA in the oxidation of MAL.

关 键 词：Catalyst support HETEROPOLYACID NANOPARTICLES OXIDATION METHACROLEIN 

分 类 号：TQ225.131[化学工程—有机化工] TQ426