• Environmental Engineering Research
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• 제12권1호
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• pp.30-35
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• 2007

Fenton system using homogeneous iron catalyst is very powerful in the degradation of organic compounds, but has a disadvantage to remove Fe ions from water after wastewater treatment. Thus, iron catalyst was bounded to support such as inorganic and polymer materials. The PVP supporting iron catalyst showed a good catalytic performance in degradation of phenol contained in waste water and iron catalyst supported on ${SO_4}^{2-}$ type PVP (KEX 511) showed the best catalytic performance. Also, reaction kinetic study was carried out in this system. Reaction constants on various catalysts was obtained from the pseudo first order equation. Reaction rate constants with the heterogenized $FeCl_2/PVP$ catalyst is a three-fold smaller than that of $FeCl_2$ catalyst.

• 폴리머
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• 제29권4호
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• pp.321-330
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• 2005

1990년대에 우리나라의 폴리올레핀 산업이 급속히 성장하였으며, 이러한 석유화학 분야의 상업성은 올레핀 중합 촉매의 발전과 무관하지 않았다. 이러한 중합촉매의 연구개발에 대한 개괄적인 현황을 파악할 수 있도록, 현재 공업적으로 사용되고 있는 담지형 Ziegler-Natta촉매와 최근에 특수 grade의 폴리올레핀 제조에 도입되고 있는 메탈로센 촉매의 발전에 수반된 여러 관점의 연구 결과를 정리하였다. 또한 이들 새로운 중합촉매의 이용으로 고분자 신소재가 개발되었고, 촉매의 담지화 과정에서 얻은 연구결과가 고분자 나노복합체의 in-situ 제조에 응용될 수 있음을 보여 주었다.

• Bulletin of the Korean Chemical Society
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• 제28권11호
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• pp.2025-2028
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• 2007

Homogeneous zinc tetrahalide complexes, highly active catalysts for the coupling reactions of alkylene oxide and CO2 produce alkylene carbonates, were heterogenized due to their tendency to decompose produced alkylene carbonates during the distillation process. Heterogenization of homogeneous zinc tetrahalide complexes was achieved by polymerizing 1-alkyl-3-vinylimidazolium zinc tetrahalides. These polymerized zinc tetrahalide catalysts displayed similar activities to their corresponding monomeric analogues for the coupling reactions of carbon dioxide with ethylene oxide (EO) or propylene oxide (PO) to produce ethylene carbonate (EC) or propylene carbonate (PC). TGA studies showed that the polymer-supported zinc tetrahalide catalysts are thermally stable up to 320 oC. The catalyst recycle test showed that the supported catalysts could be reused over six times. After removal of the polymer-supported catalyst through a simple filtration, EC was able to be isolated without decomposition.