• Title/Summary/Keyword: 팔라듐계열 촉매

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An Experimental Study on the Combustion Characteristics of a Catalytic Combustor for an MCFC Power Generation System (MCFC 발전시스템용 촉매연소기의 연소 특성에 관한 실험적 연구)

  • Hong, Dong-Jin;Ahn, Kook-Young;Kim, Man-Young
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.4
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    • pp.405-412
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    • 2012
  • In the MCFC power generation system, the combustor supplies a high temperature mixture of gases to the cathode and heat to the reformer by using the off-gas from the anode; the off-gas includes high concentrations of $H_2O$ and $CO_2$. Since a combustor needs to be operated in a very lean condition and avoid local heating, a catalytic combustor is usually adopted. Catalytic combustion is also generally accepted as one of the environmentally preferred alternatives for generation of heat and power from fossil fuels because of its complete combustion and low emissions of pollutants such as CO, UHC, and $NO_x$. In this study, experiments were conducted on catalytic combustion behavior in the presence of Pd-based catalysts for the BOP (Balance Of Plant) of 5 kW MCFC (Molten Carbonate Fuel Cell) power generation systems. Extensive investigations were carried out on the catalyst performance with the gaseous $CH_4$ fuel by changing such various parameters as $H_2$ addition, inlet temperature, excess air ratio, space velocity, catalyst type, and start-up schedule of the pilot system adopted in the BOP.

Composition Survey and Analysis of Non-Pt Oxygen Reduction Catalysts for Proton Exchange Membrane Fuel Cells (고체 고분자 연료전지용 비백금계 산소환원촉매 조성 조사 및 분석)

  • Kwon, Kyung-Jung
    • Journal of the Korean Electrochemical Society
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    • v.15 no.1
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    • pp.12-18
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    • 2012
  • The prohibitively high cost of Pt catalyst might be the biggest barrier for the commercialization of proton exchange membrane fuel cells (PEMFC) of which wide application is expected. Worldwide research efforts for the development of alternative to Pt oxygen reduction reaction (ORR) catalyst are made recently. One of the important considerations in the catalyst development is durability issue as well as economic aspect. From this point of view, platinum group metals (PGM) except Pt can be a candidate for replacing Pt catalyst because the material properties and the catalytic activity of PGM are expected to be similar to Pt. In contrast to Ir, Rh and Os to which not so much attention has been paid as an ORR catalyst, Pd that is most similar to Pt in terms of material properties and catalytic activity and Ru that is in the form of chalcogenide have been studied intensively. Activity comparison between non-Pt and Pt oxygen reduction catalysts by half cell test using RDE (rotating disk electrode) or PEMFC MEA (membrane electrode assembly) operation indicates that Pd-based catalysts show the most similar activity to Pt. In this paper we analyze the composition of PGM ORR catalyst in literature to promote the development of non-Pt ORR catalyst.