Abstract:
PURPOSE: A direct interior-modified melt carbonate fuel cell is provided, which is provided with a carbonate blocking membrane to increase the lifetime and to improve the efficiency without the increase of internal resistance and the consumption of carbonate. CONSTITUTION: The melt carbonate fuel cell comprises a carbonate blocking membrane which is made of nickel or nickel-containing alloy and blocks the delivery of the hydroxide vapor converted from the carbonate vapor or the carbonates into a catalyst, between a fuel electrode and an interior-modified catalyst layer. Preferably the carbonate blocking membrane contains pores whose mean pore size is 0.01-10 micrometers, by the degree of 30-90 %, and has the thickness of 0.1-1 mm. The carbonate blocking membrane is prepared by coating nickel or nickel-containing alloy on the surface of porous inorganic carrier selected from the group consisting of Al2O3, SiO2, TiO2 and ZrO2.
Abstract:
PURPOSE: Provided are a process for producing a Li/Na electrolyte green sheet for a molten carbonate fuel cell(MCFC) and a method for pretreating and operating the MCFC containing the Li/Na electrolyte. CONSTITUTION: The Li/Na electrolyte green sheet is produced by the process comprising the steps of: ball-milling 100pts.wt. of a carbonate mixture powder comprising Li2CO3 and Na2CO3, 10-20pts.wt. of a binder, 10-20pts.wt. of a plasticizer, 1-2pts.wt. of a dispersing agent, 1-2pts.wt. of an antifoaming agent, and 50-100pts.wt. of ethanol solvent to prepare powdery slurry; tape-casting the powdery slurry; drying at a temperature of 40-90 deg.C. The method for pretreating and operating the MCFC containing the Li/Na electrolyte includes the steps of: supplying air at an ordinary temperature-300 deg.C, a mixture gas containing carbon dioxide and 5M of hydrogen at 300-650 deg.C, and a mixture gas comprising the hydrogen, the carbon dioxide, and steam after the temperature reaches 650 deg.C to an anode of the MCFC; supplying the air at an ordinary temperature-450 deg.C, inert gas or a mixture gas containing the inert gas and less than 10M of the hydrogen at 450-650 deg.C, and a mixture gas comprising the air and the carbon dioxide after the temperature reaches 650 deg.C to a cathode of the MCFC.
Abstract:
PURPOSE: A ceramic fiber-reinforced matrix for a molten carbonate fuel cell and a method for manufacturing the same are provided which restrains cracks of matrix due to the thermal cycling that can be generated during the long term running of the molten carbonate fuel cell and the resulting deterioration of the cell. CONSTITUTION: The method for manufacturing the fiber-reinforced matrix for a molten carbonate fuel cell comprises the steps of preparing a slurry by ball milling the mixture after mixing LiAlO2 powder, dispersant, antifoaming agent and solvent; adding binder, plasticizer and ceramic fiber to the prepared slurry, mixing the materials, and ball milling the mixture; degassing the ball milled slurry; and drying after molding the degassed slurry in a tape casting process, wherein the LiAlO2 powder is selected from the group consisting of γ-LiAlO2, β-LiAlO2 and α-Al2O3, the LiAlO2 powder is a mixture of LiAlO2 HSA (high surface area) having a size of 5 microns or less and LiAlO2 LSA (low surface area) having a size of 10 microns or less, and the LSA is 10 to 30 weight parts based on the 100 weight parts of fiber and powder, wherein the ceramic fiber is selected from the group consisting of α-Al2O3, γ-LiAlO2, β-LiAlO2, α-LiAlO2, LiZrO3, Y2O3 stabilized ZrO3, LiTaO3, LiNbO3 and CeO2, and used in an amount of 5 to 20 weight parts based on 100 weight parts of powder and fiber, and wherein 10 to 40 weight parts of binder, 10 to 40 weight parts of plasticizer, 1 to 5 weight parts of antifoaming agent, 1 to 2 weight parts of dispersant and 150 to 250 weight parts of solvent are used based on 100 weight parts of powder and fiber.
Abstract:
본 발명은 액상 화학 반응법을 이용한, 한외여과 또는 기체 분리 등에 사용가능한 미세 기공 무기막의 제조 방법에 관한 것으로서, 본 발명에 의한 방법은 다공성 지지체의 벽을 사이에 두고 한 쪽 면으로는 금속염 용액을, 반대 쪽 면으로는 알칼리 유체를 각각 흘려 보냄으로써, 상기 지지체의 표면이나 기공 내부에 이와 같이 생성된 무기층을 건조시킨 후에, 고온 소결시켜 금속 산화물층을 형성시키는 것으로 이루어진다. 본 발명에 의한 제조 방법은 단 한 번의 반응을 통해서 종래의 솔-젤법에 의한 미세 기공 무기막보다 안정한 박막을 제조할 수 있으므로, 제조 효율성을 증가시켰을 뿐만 아니라, 제조 비용 또한 절감할 수 있다. 또한, 본 발명의 제조 방법에 의해서는 기공 크기의 제어가 가능하고, 박막의 두께 및 박막 형성 위치 조절이 용이한 특징을 가짐으로써, 박막 제조에 있어서 재현성을 확보할 수 있다.
Abstract:
Process for coating nitride or silicone oxide on a graphite laboratory vessel for a high temperature by a chemical vapor deposition is described. Thus, the process is composed of i)building a graphite in a shape they want, ii)coating the formed graphite by using SiH4/H2 gas at 250-400 deg.C at 1-10 Torr in a low pressure chemical vapor deposition reactor to give silicon oxide film or by using SiH4/H2/NH3 gas at 300-400 deg.C in 0.1-0.5 Torr at 50-100 W of electric power in a plasma enhanced chemical vapor deposition reactor to give silicon nitride film, iii)heat processing in nitrogen or oxygen atmosphere at 600-900 deg.C for 1 hr.
Abstract:
본 발명은 음이온 교환막 막-전극 접합체를 이용한 전기화학적 암모니아 합성방법에 관한 것으로, 보다 상세하게는 애노드; 산화철이 코팅된 가스 확산층을 함유하는 캐소드; 및 음이온 교환막;을 포함하는 암모니아 합성용 음이온 교환막 막-전극 접합체를 이용한 암모니아 합성방법에 있어서, 상기 캐소드에 가습된 질소를 공급하는 단계; 상기 애노드에 수산화칼륨을 공급하는 단계; 및 상기 막-전극 접합체에 전압을 인가하는 단계;를 포함하는 것을 특징으로 하는 암모니아 합성방법을 통하여 암모니아의 생산 수율 및 합성속도를 향상시키는 기술에 관한 것이다.
Abstract:
AlNi 또는 AlNi 및 AlNi결정상을포함하는니켈-알루미늄합금을저온에서제조하고리칭함으로써레이니니켈(Raney nickel)과같이표면에기공을가지는다공성합금을제조할수 있는다공성니켈-알루미늄합금분말, 이를이용한탄화수소개질또는수소발생촉매, 펠릿과같은성형체및 반응기, 이를저온으로제조할수 있는방법등이개시된다. 상기다공성니켈-알루미늄합금분말은 BET 표면적, 전체기공부피, 평균기공지름등에서우수한특성을나타내며, 촉매활성저하가없어메탄과같은탄화수소개질또는수소발생촉매로서유용하다. 또한, 상기방법에의하면다공성니켈-알루미늄합금분말을용이하고간단하게저온에서저가로대량제조할수 있다.