Heteropolyacid hosted to nano-silica catalyst for the oxidation of methacrolein  

作　　者：Gang Hu Qinqin Wang Mingyuan Zhu Lihua Kang 

机构地区：[1]School of Chemistry and Chemical Engineering,Shihezi University,Shihezi 832003,China [2]College of Chemistry&Chemical Engineering,Yantai University,Yantai 264010,China

出　　处：《Chinese Journal of Chemical Engineering》2025年第2期150-162,共13页中国化学工程学报(英文版)

基　　金：supported by the Taishan Scholars Program of Shandong Province(tsqn202103051);Tianshan Talents Training Program of Xinjiang(Science and Technology Innovation Team,2022TSYCTD0021);the Science and Technology Project of Xinjiang Bingtuan Supported by Central Government(2022BC001);the project of scientific research in Shihezi University(CXFZ202205);special funds for over provincial level leading talent of Yantai City.

摘　　要：In this study,a catalyst was synthesized using a two-step in-situ molecular beam epitaxy method to grow H_(4)PMo11VO_(4)0(HPAV)on amination-treated SiO_(2) nanoparticles,which served as both dopant and host agents.SiO_(2) dopant was modified with(3-aminopropyl)triethoxysilane(APTS),facilitating the formation of ammonium ions that enhanced the overall positive charge.This modification enabled the effective dispersion and exposure of HPAV's active species and induced a structural transformation of HPAV from a triclinic to a cubic crystal phase.The two-step hosting growth process optimized the proportions of Cs^(+),H^(+)and NH_(4)^(+)antinuclear ions,thereby fine-tuning the synergistic catalysis of oxidation and acidity,as well as the oxidative sensitivity at HPAV catalytic interface.The resultant 8(HPAV)&4(Cs3PAV)-NH_(2)-SiO_(2) catalyst achieved a methacrolein(MAL)conversion rate of 84%and a methacrylic acid(MAA)selectivity of 71%.Even after 10.5 h of reaction time,the catalyst retained its high dispersion,cubic crystal structure,and Keggin configuration,demonstrating stable catalytic performance over a continuous 200-h reaction period.

关 键 词：CATALYST NANOMATERIAL Composite Heteropoly acid Dopant Synthesis 

分 类 号：O643.36[理学—物理化学]