142052-71-9Relevant academic research and scientific papers
Preparation of Heterogeneous Mesoporous Silica-Supported 12-Tungstophosphoric Acid Catalyst and Its Catalytic Performance for Cyclopentene Oxidation
Yuan, Chengyuan,Chen, Jing
, p. 1191 - 1198 (2016/04/10)
Keggin-structured 12-tungstophosphoric acids were immobilized onto the surface of amine-modified mesoporous sieve SBA-15 as onium salts. All the catalyst materials were characterized by X-ray diffraction, N2 physisorption, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and X-ray photoelectron spectroscopy for their structural integrity and physicochemical properties. Characterization of the catalysts confirmed an ordered hexagonal mesostructure for SBA-15 and that the Keggin structure of the heteropolyanions on the amine-modified SBA-15 was preserved. The catalytic activities of the catalysts were evaluated for the liquid-phase oxidation of cyclopentene with 50% hydrogen peroxide as the oxidant in tert-butanol. A 100% conversion of cyclopentene and an 81% selectivity for glutaraldehyde were obtained and these were higher than that for the catalysts prepared by direct impregnation. The stability and reusability of the catalysts were studied and the catalysts could be reused at least five times, which indicates their excellent reusability. The influence of reaction temperature and reaction time was also investigated. In addition, a reaction mechanism was proposed.
Kinetics and mechanism of the catalytic oxidation of cyclopentene to glutaraldehyde with aqueous hydrogen peroxide
Dai, Weilin,Huang, Xiaojun,Chen, Haiying,Deng, Jingfa
, p. 583 - 589 (2007/10/03)
Kinetics and mechanism of the catalytic oxidation of cyclopentene to glutaraldehyde by aqueous hydrogen peroxide have been studied. In tungstic acid-t-butanol system, cyclopentene is first oxidized to cyclopentene oxide almost quantitatively, which is then transferred into an intermediate. The intermediate, which is separated and identified as β-hydroxycyclopentylhydroperoxide, can easily change into glutaraldehyde during purification. The study shows that during the formation of the intermediate two by-products are also formed. These three reactions are found to be of first-order parallel reactions. The effects of temperature and concentration of tungstic acid, hydrogen peroxide, water and t-butanol on the reaction rates have been studied. A suitable mechanism for the reaction has been proposed.
A new process for preparing dialdehydes by catalytic oxidation of cyclic olefins with aqueous hydrogen peroxide
Deng,Xu,Chen,Jiang
, p. 3503 - 3514 (2007/10/02)
Dialdehydes were prepared by the reaction between cyclic olefins and aqueous hydrogen peroxide catalyzed by tungstic acid. Glutaraldehyde and adipaldehyde were synthesized by this method with good yield. Several different conditions were tested.
