Noble metal-free V2O5/g-C3N4 composites for selective oxidation of olefins using hydrogen peroxide as an oxidant. Issue 38 (12th September 2018)

• Record Type: Journal Article
• Authors: Zou, Hui; Xiao, Guansheng; Chen, Kaihao; Peng, Xinhua
• Is Part Of: Dalton transactions. Volume 47:Issue 38(2018)
• Page Start: 13565
• Page End: 13572
• Publication Date: 2018-09-12
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt02765j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : A noble metal-free catalytic system for the oxidation of olefins to their corresponding aldehydes using H2 O2 as an oxidant. Abstract : Vanadium pentoxide modified graphitic carbon nitride (V2 O5 /g-C3 N4 ) composites were prepared through a method of wet impregnation and calcination. The obtained samples were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, photoluminescence, electron spin resonance and N2 adsorption/desorption isotherms. Oxidation of olefins was employed to evaluate the catalytic and photocatalytic activities of the prepared V2 O5 /g-C3 N4 composites. Different weight ratios (1%, 2%, 3%, 4% and 5%) of V2 O5 loaded composites were prepared and a 3% loaded composite was found to show optimal catalytic performance for the reaction. This noble metal-free catalyst showed excellent performance in the oxidation of styrene to benzaldehyde with high conversion (98.7%) and selectivity (88.4%) under visible light irradiation. A plausible mechanism was proposed for this oxidation reaction with hydrogen peroxide as an oxidant. Other styrene substrates were also selectively transformed to their corresponding aldehydes with high yields (up to 92%), using such a noble metal-free catalytic system.