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Characteristics of the Pd-Only Three-Way Catalyst Prepared by Sol-Gel Method
Noh, Jermim,Yang, O Bong,Kim, Do Heui,Woo, Seong Ihl 전남대학교 촉매연구소 1998 촉매학술발표회 Vol.- No.15
This study indicated that although hexylene glycol decreased the dispersion of active metal because of its steric hindrance effect, it considerably enhanced the thermal stability of single alumina gel catalyst. This resulted in the remarkably larger pore volume and mesoporosity that was kept even after aging at about 1,000℃. In the case of binary alumina gel catalysts, Zrpromoted catalyst showed the best activity in the NO removal after both calcination and aging. While Ce and Zrpromoted catalyst were poorly resistant to SO_2 poisoning at the temperature range below their lightoff temperature, vanadium of Vpromoted catalyst was acted as a promoter rather than an inhibitor. In particular, Pd catalysts prepared by solgel method was remarkably resistant to SO_2 poisoning, in contrast to impregnated Pd catalysts. The optimal Pd catalyst, which was a multicomponent alumina gel catalyst promoted by V and Zr, was much more resistant to SO_2 than model Pt/Rh TWC and its thermal sintering never happened to 800℃. Moreover, it was equivalent to ceriasupported Pd catalyst in oxygen storage capacity. After all, this study suggested a possibility of the sol-gel method as a novel preparation method for which could substitute the conventional impregnation method that was very poor resistant to SO_2 poisoning in the preparation of Pdonly catalysts.
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솔 - 젤법으로 제조한 Pd 계 삼원촉매 반응에서 Ceria 의 영향
소현수,이진만,노점임,양오봉,김도희,우성일 한국공업화학회 1998 응용화학 Vol.2 No.2
The effect of ceria on the catalytic performance of Pd-only three way catalysts prepared by sol-gel method was investigated by XRD, XPS and synthetic exhaust gas reaction with GHSV of 72,000 h^(-1). Optimum Ce:Zr mole ratio to stabilize ceria against thermal aging and enhance the catalytic performance was 7:3. It was found that the physical mixing of Pd catalyst, ceria stabilized with zirconium et al. and bulk ceria showed significant improvement in three way catalytic performance and thermal stability. Thermal stability of the catalysts prepared by sol-gel method were more superior than that of the catalysts prepared by impregnation method.
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우성일,김기웅,노점임,전민구,김태석 한국공업화학회 2003 공업화학 Vol.14 No.5
현재 화학공학은 생산설비 구축 및 R&D의 고비용화와 환경 및 에너지 측면의 문제의 중첩으로 인해 화학공업 자체의 저부가가치화를 가속화시켜 전자 산업 등 여타산업과의 경쟁력에서 뒤쳐지는 결과를 초래하였다. 이러한 화학공업의 문제에 대한 해결방안으로 초미세화학공정(process-on-chip) 이 새로운 대안으로 제시되고 있고, 이와 더불어 신소재 개발의 혁신적인 방법 중의 하나인 조합화학기법의 중요성이 부각되고 있다. 조합화학 기술은 한 번에 많은 조합 연구시료를 값싸게 제작하고 이들의 특성 및 성능을 고속으로 측정, 평가함으로써 "더 빨리, 더 싸게, 더 성공적으로" 첨단 기능성 화학재료를 개발할 수 있는 고속 R&D 기법과 이 기법을 이용하여 실제로 첨단 기능성 화학재료를 창출하는 응용연구로 구성되어 있다. 고속 R&D 기법은 최적 조합 시료의 작성, 고집적 조합 시료 합성, 합성된 고집적 시료의 고속 성능 평가, 고집적 시료의 고속 특성 분석의 4단계로 이루어진다. 초미세화학공정(Process-on-chip) 은 복잡한 촉매 화학 반응과 유독물질의 반응 등을 수행할 수 있는 초미세 유체 반응기를 분석 장비와 통합하여 신개념의 화학공정을 칩 상에 구현한 것을 의미하는 것이다. 이는 Lab-on-chip에서 확장된 개념으로서 단지 화학공학 분야에 국한된 것이 아니라, DNA sensor와 같은 생물분야부터 micro-fuel cell 같은 차세대 에너지원 개발분야까지 다양하게 접목할 수 있다. 특히, 이러한 기술은 최근에 시작한 미개척분야로서 우리나라로서는 충분히 도전해 볼 만한 분야이며 이로 인해 현재 낙후된 화학공업은 새로운 활력소를 가질 수 있을 것으로 예상된다. Nowadays, chemical engineering has faced fatal problems including the high cost of R&D, the environmental pollution, and high energy consumption. This is one of reasons that chemical industry is behind other industries such as electronic industry in competitive edge. To overcome these problems in chemical industry, process-on-chip is suggested as the counterproposal and combinatorial technology in discovering new materials has drawn an interest. Combinatorial technology is involved in high-throughput screening that can find novel high-performance materials and catalysts more quickly, less costly and more successfully by using rapid characterization of physical and chemical properties. This consists of four steps, (1) making optimal combinatorial samples, (2) synthesis of combinatorial chip or samples at one time, (3) primary screening for combinatorial chip or samples and (4) rapid characterization of physical and chemical properties of samples. Process-on-chip means the chemical factory built on the chip. Therefore, this combines the microfluidic reactor with analytic systems to carry out complex catalytic chemical reactions and the reaction of harmful materials that is impossible in conventional chemical process. This is the expansion of Lab-on-a-chip and can be applied into various fields from the DNA sensor to micro-fuel cell. In particular, it is challengeable in our country because process-on-chip is undeveloped field until now, and therefore it is expected that this technique can stimulate our chemical industry.
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CO2 를 이용한 에틸벤젠 탈수소반응에 미치는 지르코니아 촉매의 구조적 영향
박상언,장종산,박진남,노점임 한국공업화학회 1999 응용화학 Vol.3 No.1
It is already reported by our group that zirconia has good catalytic activity in the dehydrogenation of ethylbenzene with carbon dioxide as oxidant. Tetragonal and monoclinic zirconia are prepared by precipitation method. Tetragonal zirconia showed better ethylbenzene conversion and styrene selectivity than monoclinic zirconia. This can be ascribed by the difference of the amount of defects on zirconia surface and the difference of the surface basicity. Therefore, tetragonal zirconia is more efficient in this catalysis and there is more possibility of improvement in the modification of tetragonal zirconia.
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