Transition-Metal-Substituted Phosphomolybdates: Catalytic and Kinetic Study for Liquid-Phase Oxidation of Styrene

Abstract

Mono-transition-metal-substituted phosphomolybdates, PMo11M (M = Co, Mn, Ni), were synthesized and characterized by various physicochemical techniques. They were efficiently used for liquid-phase nonsolvent oxidation of styrene under mild reaction conditions. It was found that all of the catalysts are efficient in achieving higher conversions with high turnover numbers and are selective toward benzaldehyde. A detailed kinetic study was also carried out. Although all of the catalysts are homogeneous under the present oxidation conditions, they were regenerated and reused for up to two cycles.

Influence of peroxometallic intermediaries present on polyoxometalates nanoparticles surface on the adipic acid synthesis

“…Due to their solubility in the reaction medium, heteropolyacids were supported onto an activated carbon fiber A20 (PMo/A20) whose preparation procedure is described in previous work [14]. [15,16,17].…”

“…Thirdly, the use of POM with the addenda atom substituted by other transition metal (PCoMo, PNiMo, PFeMo, PVMo), usually employed in oxidation reactions due to the promoting effect of the catalytic activity [3,17,23,24], are inappropriate when H 2 O 2 is used as oxidant, because accelerate considerably this decomposition.…”

Metal Molybdate Catalysts for the Selective Oxidation of Olefins and Alcohols Using Hydrogen Peroxide as Oxidant

“…Melting points were measured on an X-5 microscopic melting-point (Yu Hua Instrument Company, Gong Yi). 1 H NMR and 13 C NMR spectra were recorded on a Bruker Avance III 500 MHz Digital NMR Spectrometer or 300 MHz NMR Spectrometer, using CDCl 3 or DMSO-d 6 as solvent. The conversion and selectivity were determined by a Shimadzu GC-2014C or column chromatography.…”

“…[1,2] Therefore, the synthetic methods of these aromatic aldehydes have been gradually becoming focus of the researchers. Most of reported synthetic methods involved controllable oxidation of aromatic olefins, alcohols and toluene as well as the hydrolysis of benzyl chloride.…”

Selective oxidative cleavage of terminal olefins into aldehydes catalyzed by copper(ii) complex

“…Although some studies on oxidative cleavage of olefins into aldehydes through Fe, [7][8][9][10][11] Pd, [12][13] Ru, [14][15][16] Os, [17][18] Au 19 catalysts, biphasic PEG-300/scCO 2 catalyst 20 and supported catalysts [21][22][23] with sodium periodate or other oxidants have been reported, the problems of low activity, low selectivity, environment unfriendly and severe reaction conditions are still not resolved. [24][25] In recent years, the development of a simple and effective, environmentally benign oxidation methods is attracting growing interest, 26 with protocols based on cheap and abundant metal catalysts in combination with clean oxidants being highly sought. Herein, we describe an effective method to achieve aldehyde from terminal olefin through using H 2 O 2 as an oxidant and a readily prepared copper complex LCu as catalyst, as illustrated in Scheme 1.…”