摘要
In this study,a catalyst was synthesized using a two-step in-situ molecular beam epitaxy method to grow H_(4)PMo_(11)VO_(40)(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(Cs_(3)PAV)-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.
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.
