[논문]수소 제조 촉매 개발을 위한 조합 촉매 기법의 활용

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수소 제조 촉매 개발을 위한 조합 촉매 기법의 활용
Application of Combinatorial Catalysis Techniques for Hydrogen Generation Catalysts 원문보기

한국수소 및 신에너지학회 논문집 = Transactions of the Korean Hydrogen and New Energy Society, v.18 no.3, 2007년, pp.309 - 316

초록
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조합 및 고속탐색 실험 기법을 촉매 성분의 선정에 활용하였다. 소형 연료전지 작동을 위한 수소 생산에 가장 적합한 것으로 알려진 메탄을 산화 분해용 촉매의 특성을 적외선 화상 및 병렬형 반응 시스템으로 조사하였다. 반응의 모델을 먼저 제시하고 이를 근거로 Cu-Zn-Pd계 촉매를 선정하였다. 먼저 적외선 화상을 이용한 스크리닝을 위해서는 발열 효과라는 촉매 활성의 간접적인 현상을 보여줄 수 있는 적외선 민감 카메라를 이용하여 한 번에 50개의 시료 측정이 가능한 촉매 시료 배열을 설계하였다. 적외선 화상 결과로 높은 활성을 보이는 촉매 시료를 선정한 다음, 병렬형 반응 시스템과 단일 흐름 고정층 반응 시스템으로 선정된 촉매의 활성 특성을 조사 확인하였다. 본 연구에서 제시한 것과 같은 접근 방법으로 지속적으로 얻어진 결과를 반영하여 최적의 활성을 보이는 촉매 성분을 단기간에 찾아내고자 한다.

주제어

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문제 정의

It is clearly demonstrated from Table 1, however, that a Ce containing quaternary catalyst is the most active and selective of all the catalysts studied. Further work using multiple characterizatiien techniques will help to optimize the catalysts needed for attaining the objective of this work.

가설 설정

3) Addition of Ce or Zr to Cu/Zn/Pd increased the conversion of methanol and selectivity to hydrogen.

제안 방법

As shown in Fig. 1, we first start with an exhaustive search of the existing literature of the reaction under study to formulate a hypothetical model of the reaction that guides us to search for families of materials that might be active. This approach differs with a more intensive approach for searching every material throughout the periodic table without guidance on materials that have a chance to be active or selected for the reaction under investigation.
Further work proceeded using the parallel flow COMBI reactor to verify the IRT results under conditions typical of catalytic exploratory results. The results for methanol conversion and selectivity to hydrogen obtained in the parallel flow COMBI reactor for various catalysts selected from IRT results are presented in Fig.
However, none of them including the traditional catalyst for methanol synthesis Cu/ZnO is robust enough for on-board hydrogen production in a variety of conditions. In this work, we have prepared a series of Cu/Zn/Pd and Cu/Zn/Pd/M catalysts with different compositions and metal combinations by the coprecipitation method and evaluated their reaction characteristics by the selective combinatorial catalysis experimentation.
There are some differences between the two types of reactors in quantitative data probably due to the fact that heat and mass transfer of the fixed-bed plug flow is different from that of the parallel reactor. It should be emphasized that the results presented here were obtained in a fast track experimental program comprising four weeks of experiments. A similar program using a sequential approach would have taken several months.
Finally, the best catalyst is studied in a single flow fixed-bed reactor to get the reaction rate parameters and is characterized to determine its bulk and surface structure. The knowledge gained from these results is then used to formulate a revised model of the surface and the reaction. The revised model is used in a second round of experiments to optimize the catalyst.
temperature constant. The most active catalyst from the COMBI studies is then studied in detail in a single flow micro-reactor to obtain kinetic results and compare their consistency with the proposed model. The model is then modified accordingly and new formulations/preparations are chosen to optimize the activity of the materials.
The knowledge gained from these results is then used to formulate a revised model of the surface and the reaction. The revised model is used in a second round of experiments to optimize the catalyst. The final model in this approach will give the best catalyst.

대상 데이터

only four experiments. The IRT images of Cu/Zn, Cu/Zn/Pd, and Cu/Zn/Pd/M catalysts were obtained at various temperatures in the IR cell with an array of nine spots(one blank spot). Fig.

후속연구

4) Further work is needed to characterize and verify the working hypothesis of the selected groups of catalysts.

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