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Methanol-tolerant PdPt/C alloy catalyst for oxygen electro-reduction reaction
주지봉,You Jung Kim,Wooyoung Kim,김남동,김필,김영훈,이종협 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
A carbon-supported Pd-based PdPt catalyst (PdPt/C) with a small amount of Pt was prepared by borohydride reduction method and its activity in the oxygen electro-reduction reaction (ORR) was investigated in acidic conditions both with and without methanol. For comparison, carbon-supported Pt (Pt/C) and Pd (Pd/C) catalysts were prepared and the ORR activities were compared. Results revealed that the PdPt/C catalyst showed slightly lower ORR activity in terms of onset potential of oxygen reduction than Pt/C catalyst in 0.1M HClO4. However, PdPt/C catalyst exhibited enhanced activity toward selective ORR with methanol-tolerant characteristics in 0.1M HClO4 in the presence of methanol. The PdPt/C catalyst prepared here is suitable for use as a cathodic electrocatalyst in direct alcohol fuel cells after addition of small amount of expensive Pt metal.
Simple preparation of hollow carbon sphere via templating method
주지봉,김우영,김종식,김남동,이종협,김필 한국물리학회 2008 Current Applied Physics Vol.8 No.6
The hollow carbon sphere (HCS) was synthesized using silica particle and sucrose as a template and carbon precursor, respectively, under a hydrothermal condition. The prepared HCS were characterized by SEM, TEM and N2 adsorption. The prepared HCS showed uniforms size and high mesoporosity. It was found that the presence of acidic site on the silica particle templates would be crucial for the preparation of the HCS. Without the acidic site on silica particles, the macroporous carbon with high microporosity was prepared. It was found that the method employed in this work was highly suitable for the preparation of monodisperse HCS. The hollow carbon sphere (HCS) was synthesized using silica particle and sucrose as a template and carbon precursor, respectively, under a hydrothermal condition. The prepared HCS were characterized by SEM, TEM and N2 adsorption. The prepared HCS showed uniforms size and high mesoporosity. It was found that the presence of acidic site on the silica particle templates would be crucial for the preparation of the HCS. Without the acidic site on silica particles, the macroporous carbon with high microporosity was prepared. It was found that the method employed in this work was highly suitable for the preparation of monodisperse HCS.
주지봉,You Jung Kim,Wooyoung Kim,김남동,김필,김영훈,이윤우,이종협 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
Mesoporous carbon (MC)-supported PtCo catalysts were prepared by a sodium borohydride (NaBH4) reduction method. To increase the alloy degree of PtCo catalyst, the heat treatment was carried out at various temperatures (300-700 oC). The heat-treated PtCo catalysts (PtCo/MC-x) had the higher degrees of Pt-Co alloy than that of as-synthesized PtCo catalyst (PtCo/MC). MC supported-PtCo catalyst (PtCo/MC-500) that was treated at 500 oC, had the highest activity and lowest overpotential in oxygen electro-reduction (ORR) among the prepared PtCo catalysts. The high alloy degree and favorable chemical states of PtCo/MC-500 are believed to be responsible for the superior activity in oxygen electroreduction compared to the other PtCo catalysts.
가스화 공정에서 발생하는 타르 촉매 제거를 위한 니켈 촉매 합성
주지봉,최동섭,김지율,장세진,김나연 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
플라스틱은 유기화학 고분자 물질로, 기능적으로 우수하고, 경제성이 뛰어나며, 기존재료 대체재로 이용도가 높아 전세계적으로 꾸준히 그 사용범위와 사용량이 늘어나고 있다. 우리나라에도 플라스틱 산업이 크게 성장하고 있으며, 이로 인한 사용된 폐플라스틱 양도 지속적으로 증가하고 있다. 최근, 소각 처리에 대한 국민적 정서로 인하여, 폐플라스틱의 재활용 에 대한 관심이 매우 높아지고 있다. 폐플라스틱을 가스화 연료로 사용할 경우, 수소 및 일산화탄소의 합성가스를 생산할 수 있어 그 경제적 이익 매우 크다. 하지만 공정에서 발생하는 타르로 인하여 후단 공정에 무리를 주게 되어 설비 가동에 문제가 생긴다. 본 연구에서는 가스화공정에서 발생되는 타르를 효과적으로 제거하기 위한 금속 촉매를 제조하는 전략과 결과에 대해서 발표하고자 한다. 니켈 촉매를 이용하는 타르 제거 반응에서 가장 문제가 되는 코킹 문제와 열적 소결 현상을 방지하기 위해 조촉매 도입 및 코어-쉘 구조의 촉매를 제조하고자 한다.
주지봉,박종철,이종협 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
Wastewater from textile processes is highly contaminated with refractory organic pollutants such as dyes, polymers and aromatic compounds. Advanced oxidation processes have been successfully used for the textile wastewater treatment instead of conventional technologies. Catalytic wet oxidation (CWO) has attracted much attention due to their mild operating conditions and high efficiencies in the removal of refractory pollutants. In this study, perovskite-type crystalline metal oxides were supported on mesoporous silica SBA-15 (LaFeCu/SBA-15), followed by coating on secondary support ceramic honeycomb (LaFeCu/SBA/HC) for the development of continuous CWO process. Both powder and honeycomb supported catalysts were characterized by N2 adsorption, SAXS, SEM, XRD and ICP-AES. catalytic activities were examined in a continuous reactor at an ambient pressure and 90℃ using hydrogen peroxide as an oxidizing agent. LaFeCu/SBA/HC catalysts showed more than 73% TOC and 80% COD removal percentages. Experimental results showed that honeycomb catalyst is one of promising candidates for catalytic wet oxidation of textile wastewater.
주지봉,박종철,이종협 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
Perovskite structured crystalline LaFeO3 catalysts supported on the mesoporous silica were prepared. Modified polymerizable complex method was used as a novel catalyst preparation method. The synthesized catalysts were characterized by N2 adsorption, SAXS, TEM, SEM, ICP-AES, XRD, TPR and TPD. XRD results showed that the supported LaFeO3 had perovskite-type crystalline structure with high crystallinity. Catalytic wet oxidation of organic compounds was performed in a batch reactor at ambient pressure and 90℃ using hydrogen peroxide as oxidizing agent. EG(Ethylene Glycol), PVA (polyvinyl alcohol) and phenol were tested as target organic compounds and TOC (Total Organic Carbon) and hydrogen peroxide concentrations in reacting medium were measured. Catalysts synthesized in this study showed over 80% TOC removal efficiencies for each reactants. Experimental results showed that the LaFeO3 on the mesoporous silica catalysts are a promising candidate for the catalytic wet oxidation of refractory organic compounds.