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Recovery and Recycling of Ti Supported Bimodal Mesoporous Catalysts Prepared via ship-in-a-bottle method in the Epoxidation of Cyclohexene

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Chinese Journal of Chemical Engineering 2014年第8期22卷 914-920页

作者：白诗扬胡新涛孙继红任博王金鹏 Department of Chemistry and Chemical Engineering College of Environmental & Energy EngineeringBeijing University of Technology

Ti/BMMs （Ti supported bimodal mesoporous silica） catalysts have been prepared via self-assembly route com- bined with ship-in-a-bottle method. The recovery and recycling performances of Ti/BMMs were investigated in the epoxidation of cyclohexene. In order to the evaluate the regeneration methods and to examine the deactivation behaviors, the deactivated Ti/BMMs catalysts were washed in chloroform or calcinated at 450 ℃ for 6 h and then activity of the recovery catalysts were examined. Meanwhile, the structure features and surface properties of the regenerated catalysts were characterized by X-ray diffraction, N2-sorption analysis, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravi- metric analysis, UV visible spectroscopy and X-ray photoelectron spectroscopy. The results showed that the typical bimodal mesoporous structure of recycled Ti/BMMs catalysts was still maintained, and the phenomenon of Ti leaching during the catalytic process and recovery was negligible. In particular, spectroscopic observations indicated that the effects of the regeneration methods on the tetrahedrally-coordinated Ti species and catalytic deactivation were remarkable. The main reasons were related to the polarities of used solvents during recovery tests, the environment medium of adsorbed water inside mesopore channels and the deposition of bulky mole- cules of by-products on the mesoporous surface.

关键词： Ti/BMMs ship-in-a-bottle method Recovery Recycling Epoxidation of cyclohexene

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Oxidation of 4-chloro-3-methylphenol using zeolite Y-encapsulated iron(Ⅲ)-,nickel(Ⅱ)-,and copper(Ⅱ)-N,N'-disalicylidene-1,2-phenylenediamine complexes

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Chinese Journal of Catalysis 2016年第1期37卷 135-145页

作者： Solomon Legese Hailu Balachandran Unni Nair Mesfin Redi-Abshiro Isabel Diaz Rathinam Aravindhan Merid Tessema 中央皮革研究所化工实验室亚的斯亚贝巴大学化学系催化与石油化学研究所

The degradation of 4-chloro-3-methylphenol（PCMC）using zeolite-encapsulated iron（III）,nickel（II）,and copper（II）complexes of N,N’-disalicylidene-1,2-phenylenediamine as catalysts,in a heterogeneous Fenton-like advanced oxidation process,was *** physicochemical properties of the catalysts were determined using powder X-ray diffraction,thermogravimetric analysis,Brunauer–Emmett–Teller surface area analysis,Fourier-transform infrared spectroscopy,elemental analysis,and scanning electron *** effects of four factors,namely initial H2O2 concentration,catalyst dosage,temperature,and pH,on the degradation of a model organic pollutant were *** results show that at low acidic pH,almost complete removal of PCMC was achieved with the iron（III）,nickel（II）,and copper（II）catalysts after 120 min under the optimum reaction conditions：catalyst dosage 0.1 g,H2O2 concentration 75 mmol/L,initial PCMC concentration 0.35mmol/L,and 50 °*** reusability of the prepared catalysts in PCMC degradation was also studied and a possible catalyst deactivation mechanism is *** possible intermediate products,degradation pathway,and kinetics of PCMC oxidation were also studied.

关键词： ship-in-a-bottle method 4-Chloro-3-methylphenol Pseudo-first order Deactivation Hydroxyl radical

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