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( Ranjit Kulkarni ),박상언,서동우,최혜정 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
By the advantages of microwave synthesis metal loaded TUD-1(Ti-TUD-1, Cu-TUD-1 etc.) were successfully prepared by using triethanolamine (TEA) as both structure directing and chelating agents. Further this M-TUD-1 catalysts were investigated in the liquid-phase hydroxylation of phenol with H2O2. The enhanced hydroxylation activity and improved selectivity on the hydroxylated products were obtained under CO2 expanded system even at moderate pressures. It is known that CO2 expanded system contribute to the solubility enhancement of reactants and volume expansion as well, which result in activity enhancement. In this system, M-TUD-1 catalysts could be operated one-step hydroxylation of benzene under more greener than solvent used by replacing with gaseous CO2 together with hydrogen peroxide in water.
CO2 as promoter in the liquid-phase oxidation of aromatics
( Ranjit Kulkarni ),박상언,모용환,서동우 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In this study liquid phase solvent free catalytic oxidation of toluene was investigated over transition metal doped mesoporous carbon nitride (MCN) using O2 as a terminal oxidant. A series of metal-doped graphitic carbon nitride catalyst (Co-, Fe-, Mn-, (Co/Mn)-, and Ni-UF-MCN) were successfully synthesized by wet incipient impregnation method. It was found that the Fe (III)-doped graphitic UF-MCN catalyst was the most efficient catalytic system and exhibited a highest conversion of 6% with selectivity`s of (45%) Benzaldehyde and (45%) Benzoic acid. The Co-Presence of CO2 under analogous conditions showed enhancement in conversions (12%) and elevated selectivity`s (87%) towards Benzoic acid with minor product as Benzaldehyde. The quantification of the promotional effect of the synergism in the co-presence of CO2 was found to be 18-47 %. In situ FT-IR and GC studies revealed the CO formation of surface and the existence of CO in the gaseous mixture.
( Ranjit Kulkarni ),임청래,김중조,박상언 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Microwave mediated synthesis provides an efficient one pot approach for synthesis of microporous and hierarchically porous organic polymers in relative short time. Synthesized Porphyrin Porous Organic Polymer (P-POP) exhibited moderate surface area of 681 m2/g and high CO2 adsorption capacities of 9 wt % at 40℃. The synthesized P-POP purely consists of Porphyrin macrocycles and has shown to exhibit excellent activity towards N-H insertion reaction, with highest conversions of 60% with 85% selectivity towards mono insertion product.
Co-Activation of CH4 and CO2 for Acetic acid over Cu-Loaded catalysts
( Abdelrahman Rabie ),( Ranjitkulkarni ),최영주,박상언 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Cu nanoparticles were loaded onto NaZSM-5 and proven to form acetic acid by the co-feed of methane and carbon monoxide in a continuous flowed fixed-bed microreactor. Considerable yield on acetic acid were obtained via one-step reaction without cyclic or two-step reaction by feeding methane and CO2 alternatively in overall reaction temperatures between 425 to 525°C, and 5x10(4) μmol.gcat-1 of acetic acid was obtained at 525 °C with CO2/CH4 having molar ratio of 2.75, and 360 ml hr-1 of space velocity based on methane. Reduced Cu exchanged Na-ZSM5 catalyst exhibited superior formation rate of acetic acid than Cu ion exchanged NaZSM-5 and Cu-HZSM-5 catalysts. Hence, the supported Cu nanoparticles NaZSM-5 catalyst could enable activate both CO2 and CH4 simultaneously to give acetic acid in a continuous reaction mode.