Covalent immobilization of Dawson polyoxometalates on hairy particles and its catalytic properties for the oxidation desulfurization of tetrahydrothiophene. (20th November 2020)

• Record Type: Journal Article
• Authors: Liu, Yefeng; Zuo, Peng; Wang, Ruixin; Liu, Yaqing; Jiao, Weizhou
• Is Part Of: Journal of cleaner production. Volume 274(2020)
• Publication Date: 2020-11-20
• Subjects: Dawson polyoxometalates -- Hairy particles -- Covalent immobilization -- Oxidative desulfurization; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.122774
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Poly (glycidyl methacrylate) (PGMA) was grafted onto the SiO2 surface to prepare the hairy particles PGMA/SiO2 using the "grafting from" method, and then vacant Wells-Dawson-type polyoxometalates (POMs) was covalently bonded to PGMA/SiO2 using the silane coupling agent to prepare heterogeneous catalyst POM-PGMA/SiO2 . It is highly efficient and selective for tetrahydrothiophene (THT) oxidation. The oxidation process of THT catalyzed by POM-PGMA/SiO2 using H2 O2 presented some special characters. POM-PGMA/SiO2 showed a certain microenvironment effect of the carrier, and effectively promoted the THT oxidation. There are optimal values for both the amount of POM-PGMA/SiO2 and the bonding amount of POM for THT oxidation, and the excessive catalyst and too high density of catalytic active sites can both decrease the catalytic activity. Alkalinity is not conducive to oxidation of THT with H2 O2 . More attractively, POM-PGMA/SiO2 could be well reused several times, stemming from the strong covalent bonding between the POM clusters and the polymers on SiO2 surface. Graphical abstract: Image 1 Highlights: Hairy particles covalently supported catalysts (POM-PGMA/SiO2 ) are designed and prepared. The catalytic oxidation of THT by P2 W17 -PGMA/SiO2 presented some special characters. P2 W17 -PGMA/SiO2 showed a certain microenvironment effect for the oxidation of THT. The desulfurization rate of THT reached 100% at room temperature for a short time (60 min). P2 W17 -PGMA/SiO2 could be recycled several times with little loss of detectable catalytic activity.