Silica-supported chitosan–platinum complex catalyst for hydrosilylation reactions

Zhao, Jianbo; Sun, Xiaoli; Xie, Bing; Wang, Guoqing; Song, Shiqiu; Sun, Yuan

doi:10.1007/s11164-009-0059-z

Cited by 7 publications

(1 citation statement)

References 17 publications

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“…Cr, Ti, Mo or P) on carriers (e.g. silica or alumina) or as bulk systems [5][6][7][8][9][10][11][12][13][14][15]. V-Cr-O based composite oxides are known to be highly e cient for selective gas-phase ammoxidation of various chloro-substituted toluenes.…”

Section: Introductionmentioning

confidence: 99%

Effect of metal oxide contents on the structure and performance of spray dried CrVO4/SiO2 catalysts for the ammoxidation of chlorotoluenes

Tong,

Huang,

Tang

et al. 2024

Preprint

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This work aims at developing a customized ammoxidation catalyst through optimizing the metal oxide content in CrVO4/SiO2 catalysts. Various amounts of Cr-V-O with 1:1 molar ratio of Cr/V were successfully loaded on SiO2 via spray drying method with colloidal silica as the binder. Polarized light microscope (PLM) illustrated that the CrVO4/SiO2 particles presented as well dispersed microspheres in the micro size (20-80 μm). X-ray diffraction spectroscopy (XRD) confirmed the formation of monoclinic CrVO4 phase wherein the metal oxide content was ranged from 30 to 70 weight percent. FT-IR spectra indicated that the introduction of metal oxide had no obvious effects on the skeletal structure of SiO2. X-ray photoelectron spectroscopy (XPS) analysis revealed that the valence state of V and Cr was hardly affected with increasing the metal oxide content. Performances of the obtained CrVO4/SiO2 catalysts with different metal oxide contents were investigated via the ammoxidation of a model compound namely; para-chlorotoluene. As a result of catalytic test, the CrVO4/SiO2 catalyst with 60% metal oxide content exhibited the best catalytic performance. In addition, this catalyst was an efficient and selective catalyst toward ammoxidation reactions of toluene, ortho- and meta-chlorotoluenes.

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