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공업화학 촉매 / 반응공학 : Keggin 및 Dawson 형 헤테로폴리산에 의한 MTBE 합성
박교익(Gyo Ik Park),이화영(Wha Young Lee),송인규(In Kyu Song) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.2
A Dawson-type heteropolyacid, H_6P₂W_(18)O_(62), was successfully prepared and characterized in this work, and the catalytic properties of H_6P₂W_(18)O_(62) were compared with those of Keggin-type heteropolyacid, H₃PW_(12)O_(40). The single or the mixed catalyst of H_6P₂W_(18)O_(62) and H₃PW_(12)O_(40) was applied to the vapor-phase MTBE(methyl tert-butyl ether) synthesis from TBA(tert-butyl alcohol) and methanol. TBA dehydration was independently carried out in order to ensure the reaction characteristics of MTBE synthesis. It was found that H₃PW_(12)O_(40) retained the higher acid strength than H_6P₂W_(18)O_(62), and H₃PW_(12)O_(40) was more efficient than H_6P₂W_(18)O_(62) in the TBA dehydration. It was also observed that the Dawson-type heteropolyacid was much more efficient than the Keggin-type heteropolyacid in the MTBE synthesis. The mechanical mixture of H₃PW_(12)O_(40) and H_6P₂W_(18)O_(62) didn`t show a synergy effect in the catalytic reactions, but only showed the independent catalytic functions of each component itself.
헤테로폴리산과 고분자가 혼성된 필름촉매의 활성에 용매가 미치는 영향
이종국(Jong Koog Lee),송인규(In Kyu Song),박교익(Gyo Ik Park),이화영(Wha Young Lee) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
Membrane-like 12-molybdophosphoric acid-blended polymer(polysulfone or polyphenylene oxide) film catalysts were prepared by blending two materials using common solvent(dimethyformamide) or using mixed solvent(methanol-chloroform). and the effects of solvent on the catalytic activities of the film catalysts were examined for ethanol conversion and 2-propanol conversion reaction. The film catalyst prepared by using common solvent showed a lower acidic activity and a higher redox activity than l2-molybdophosphoric acid, whereas the film catalyst prepared by using mixed solvent showed a lower or similar acidic function and a higher redox function than 12-molybdophosphoric acid. It was found that the enhanced redox activity of the film catalysts was mainly due to the fine dispersion of the catalyst through polymer films. The acidic function of the film catalysis was strongly affected by solvent, polymer material, and blending pattern(physical blending or physicochemical blending). It is concluded that heteropoly acid-blended polymer film catalyst can be designed to meet the need for the selective oxidation reaction by using basic common solvent or by using mixed solvent.