Abstract:
본 발명은 고성능 수성가스 전환 반응용 촉매와 이의 제조방법에 관한 것으로서, 더욱 상세하게는 세리아(CeO 2 ) 담체상에 활성성분으로서 구리(Cu), 니켈(Ni) 및 백금(Pt)이 담지된 조성을 이루고 있으며, 백금(Pt) 담지량을 1 중량% 미만으로 최소화하였음에도 불구하고 백금(Pt) 담지량이 5 중량%인 Pt/CeO 2 촉매는 물론 상용 LTS 촉매와 비교하여 촉매활성이 우수함은 물론 열주기(thermal cycling)에 대해 우수한 내구성을 갖는 고성능 수성가스 전환 반응용 촉매와 이의 제조방법에 관한 것이다.
Abstract:
본 발명은 에틸렌카보네이트와 메탄올의 에스테르 교환반응과 생성된 디메틸카보네이트의 증류가 동시에 이루어지는 반응증류탑 충진용 펠릿형 K/MgO 촉매의 제조방법에 관한 것으로서, 더욱 상세하게는 촉매 지지체로서 마그네시아(MgO)를 펠릿상으로 성형하여 소성하는 방법과 성형된 MgO 펠릿의 표면 및 기공에 칼륨(K) 성분을 담지하여 소성하는 방법을 특이성 있게 수행하여 제조됨으로써 반응증류탑 내의 고정층 충진물겸 촉매로서 우수한 성능을 보이는 펠릿형 K/MgO 불균일촉매의 제조방법에 관한 것이다.
Abstract:
본 발명은 탄화수소와 이산화탄소의 내부개질반응(Internal Reforming)용 고체산화물 연료전지에 관한 것으로서, 더욱 상세하게는 고체 산화물 전해질(YSZ)의 한쪽 면에 공기극(La 0.8 Sr 0.2 MnO 3 )이 부착되어 있고, 다른 한쪽 면에는 Ni-YSZ계 또는 페롭스카이트계 금속 산화물의 촉매전극(anode)이 부착되어 있는 고체산화물 연료전지로서, 전기화학적 전환반응시스템에 적용되어서는 상기 촉매전극(anode) 내부에서 탄화수소와 이산화탄소의 내부개질반응이 진행되고 동시에 전기화학적 전환반응에 의해 합성가스(syngas)와 전기에너지(electricity)를 동시에 생성시키게 되며, 특히, 탄소침적 현상이 억제되어 탄소침적에 의한 촉매의 비활성화 및 고에너지 소모의 문제점을 동시에 해결할 수 있는 장점을 가지고 있다.
Abstract:
PURPOSE: A cooling fluid composition for low temperature is provided, to obtain a novel cooling fluid composition which contains no CFC and HCFC and can replace R-502 destroying the ozone layer. CONSTITUTION: The cooling fluid composition comprises 10-60 wt% of difluoromethane (CH2F2, HFC-32); 5-75 wt% of pentafluoroethane (CHF2CF3, HFC-125); and 15-35 wt% of 1,1,2,2-tetrafluoroethane (CHF2CHF2, HFC-134). Also the cooling fluid composition comprises 10-70 wt% of difluoromethane (CH2F2, HFC-32); 10-82 wt% of pentafluoroethane (CHF2CF3, HFC-125); and 8-20 wt% of 1,1-difluoroethane (CH3CHF2, HFC-152a).
Abstract:
PURPOSE: A gasoline reforming catalyst for fuel cell automobiles is provided, which has high catalyst activity, high hydrogen selectivity and low CO selectivity and has improved durability against carbon deposition or sulfur poisoning, and a preparation method of the same is provided. CONSTITUTION: The gasoline reforming catalyst for fuel cell automobiles is characterized in that the catalyst is manufactured by supporting 5 to 15 wt.% of Mg as a base catalyst constituent and two or more transition metals selected from transition metal group consisting of 2 to 15 wt.% of Ni, 0.1 to 15 wt.% of Co, 2 to 15 wt.% of Fe, 2 to 15 wt.% of Mo, 0.1 to 1.0 wt.% of Cr, 0 to 0.005 wt.% of Ti and 0 to 0.005 wt.% of Zr as active catalyst constituents onto a porous support of γ-alumina or silica-alumina(Si-Al), wherein content of the porous support is 21 to 42 wt.% based on the metal weight.
Abstract:
The present invention relates to a catalyst for producing 1,1-difluoroethane (HCFC-152a) and producing method thereof. More particularly, it is to provide the catalyst prepared by impregnating palladium on the active carbon pretreated with an aqueous hydrogen fluoride solution and an aqueous hydrogen chloride solution in series and its use in the production of 1,1-difluoroethane (HCFC-142b) by dehydrochlorinating 1,1-difluoro-1-chloroethane at 240-300° C. in the supplying molar ratio of 2-6 (H2/HCFC-142b) with maximizing a selectivity toward the product of HCFC-152a.
Abstract:
PURPOSE: A method for preparing hexafluoropropylene and peroctafluorocyclobutane simultaneously and selectively is provided, by inhibiting the production of solid polymer and carbon and controlling the reaction temperature. CONSTITUTION: The method comprises the step of supplying tetrafluoroethylene prepared by the pyrolysis of difluorochloromethane and H2O in the molar ratio of 0.1-10 into a flow layer reactor equipped with a distributor for steam supply, to allow the dimerization of tetrafluoroethylene to be carried out. Tetrafluoroethylene is prepared at the difluorochloromethane pyrolysis device comprising a preheater(2), a super heating unit(4), a cooler and a tetrafluoroethylene distillation tower(12); is purified at the distillation tower after passing a HCl absorption tower(8), a NaOH column(9) and a dryer(10); and is supplied into the flow layer reactor from the center of the distillation tower. Preferably the reaction temperature of the dimerization of tetrafluoroethylene is 600-780 deg.C.
Abstract:
The catalyst for manufacturing chlorine is made by; (a) mixing the aqueous solution of CrO3 of 6 anions with ethanol; (b) heating and refluxing at above 90 deg.C; (c) calcinating at 400-500 deg.C for 3-10 hrs after seperating and drying the precipitate;(d) molding with 3-10 wt% stearic acid dissolved in chloroform added. Chlorine is prepared by reacting HCl and oxygen at the molar ratio of 4:1-4:4 at 350-375 deg.C under the catalyst Cr2O3.