Abstract:
The present invention relates to synthetic peptides having selectively protected amines of untargeted sites and to methods for production thereof and for specifically conjugating PEG to targeted sites of the synthetic peptides using the same. The present invention provides a much higher yield of PEG conjugated peptides in which PEG is specifically combined to amines at targeted sites.
Abstract:
The present invention relates to a structured catalyst for reforming of gasoline and a method of preparing the same, more particularly to a structured catalyst for reforming of gasoline for fuel-cell powered vehicles prepared by wash-coating the transition metal based reforming catalyst on the surface of the ceramic honeycomb support wash-coated with sub-micron sized alumina or its precursor to sufficiently increase the effective surface area and the performance of the catalyst and a method of preparing the same.
Abstract:
The present invention relates to a structured catalyst for reforming of gasoline and a method of preparing the same, more particularly to a structured catalyst for reforming of gasoline for fuel-cell powered vehicles prepared by wash-coating the transition metal based reforming catalyst on the surface of the ceramic honeycomb support wash-coated with sub-micron sized alumina or its precursor to sufficiently increase the effective surface area and the performance of the catalyst and a method of preparing the same.
Abstract:
The present invention relates to a solid oxide fuel cell for internal reforming of hydrocarbons and carbon dioxide, in particular, to a solid oxide fuel cell in which one side of solid oxide electrolyte (YSZ) is attached to an air electrode (La0.8Sr0.2MnO3) and its other side is attached to a catalyst electrode of Ni-YSZ type or perovskite type metal oxide. The electrochemical conversion system using the solid oxide fuel cell permits the occurrence of internal reforming of hydrocarbons and carbon dioxide concomitantly with the coproduction of a syngas and electricity, and overcomes the shortcomings associated with the catalytic deactivation due to carbon deposition and the high-energy consumption.
Abstract:
The present invention relates to a solid oxide fuel cell for internal reforming of hydrocarbons and carbon dioxide, in particular, to a solid oxide fuel cell in which one side of solid oxide electrolyte (YSZ) is attached to an air electrode (La0.8Sr0.2MnO3) and its other side is attached to a catalyst electrode of Ni-YSZ type or perovskite type metal oxide. The electrochemical conversion system using the solid oxide fuel cell permits the occurrence of internal reforming of hydrocarbons and carbon dioxide concomitantly with the coproduction of a syngas and electricity, and overcomes the shortcomings associated with the catalytic deactivation due to carbon deposition and the high-energy consumption.
Abstract translation:本发明涉及一种用于碳氢化合物和二氧化碳的内部重整的固体氧化物燃料电池,特别涉及一种固体氧化物燃料电池,其中固体氧化物电解质(YSZ)的一侧连接到空气电极(La 0.8 Sr 2 O 2 MnO 3 3),其另一面与Ni-YSZ型或钙钛矿型金属氧化物的催化剂电极连接。 使用固体氧化物燃料电池的电化学转化系统允许在合成气和电力的共同生成的同时发生碳氢化合物和二氧化碳的内部重整,并且克服了由于碳沉积和高能量消耗引起的催化失活相关的缺点 。
Abstract:
Nitrogen trifluoride is produced with a high yield by the method comprising forming a fast stream of micro droplets of a fused ammonium fluoride salt by rapidly ejecting the fused ammonium fluoride salt into a reactor through a nozzle while circulating the fused ammonium fluoride salt in the reactor from a lower portion to an upper portion; and contacting micro droplets of the fused ammonium fluoride salt with fluorine gas sucked in the reactor through a suction pipe for fluorine by a negative pressure formed around the nozzle due to an ejection of the fused ammonium fluoride salt, whereby excessive generation and regional accumulation of the heat of reaction are prevented, reducing the reaction temperature by 10˜30° C. compared with those of the existing methods, and a side reaction occurs only to a slight extent according to the lowered reaction temperature.
Abstract:
The present invention relates to a process for simultaneously preparing tetrafluoroethylene and hexafluoropropylene by the pyrolysis of difluorochloromethane mixed in the molar ratio of super-heated steam/pre-heated difluorochloromethane ([H2O]/[R22]) of 5-10 under the conditions such as a temperature of 730° C. to 760° C. and a residence time of 0.01 to 0.2 seconds, where the unreacted R22 and produced HFP are recycled and controlled to have an appropriate molar ratio of HFP/R22 of 0.01 to 0.1 in order to obtain a high yield of HFP. Thus, the pyrolysis process of the present invention is efficient for preparing TFE and HFP, which are essential monomers in fluorinated resin industry.
Abstract:
The present invention relates to novel refrigerant mixtures as a substitute for chlorodifluoromethane (CHClF2, HCFC-22). More specifically, the invention is directed to refrigerant mixtures that comprise: difluoromethane (CH2F2, HFC-32) as the first component; pentafluoroethane (CHF2CF3, HFC-125) as the second component; 1,1,1,2-tetrafluoroethane (CH2FCF3, HFC-134a) as the third component; any one of cyclopropane (C3H6, RC-270), 1,1-difluoroethane (CH3CHF2, HFC-152a), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), octafluorocyclobutane (C4F8, RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea), bis(difluoromethyl)ether (CHF2OCHF2, HFE-134), pentafluoroethylmethylether (CF3CF2OCH3, HFE-245), n-pentane (C5H12, R-601) and isopentane ((CH3)2CHCH2CH3, R-601a) as the fourth component. The refrigerant mixtures of the invention have working effects equal to that of HCFC-22 but does not have the risk of causing destruction to the ozone layer and can therefore be used as alternative refrigerants to HCFC-22.
Abstract:
A process is disclosed for preparing N,N'-disubstituted urea by reacting an amine and CO/O.sub.2 mixture gas in the presence of a catalyst system comprising at least one selenium compound selected from SeO.sub.2, (CH.sub.3 O)Se(O)(OH) and (CH.sub.3 CH.sub.2 O)Se(O)(OH), and M.sub.2 CO.sub.3 (M=alkali metal) as a co-catalyst. The process enables less active aromatic amine with a low reactivity as well as an aliphatic amine to be easily transformed into disubstituted urea avoiding the use of expensive precious metal catalysts.
Abstract:
A method of preparing carbamates by reacting amine with alcohol and mixed gas of CO/O.sub.2 in the presence of one or more catalyst selected from the group consisting of monovalent copper halide having the structural formula of Cu�NCMe.sub.4 !X, K�CuX.sub.2 !, �CuX(S)! (wherein X=Cl, Br, or I; S=solvent) or monovalent copper compound having carbonyl group having the structural formula of �Cu(CO)X.sub.a L.sub.b !.sub.m Y.sub.n (wherein, X=CF.sub.3 CO.sub.2, Cl, HB(pz).sub.3 (wherein, pz=pyrazoyl,C.sub.3 H.sub.3 N.sub.2), LBF.sub.2, {LBF.sub.2 =difluoro-3,3'-(trimethylenedinitrilo)bis(2-butanone oximato)borate}; L=en, diene; Y=BPh.sub.4, AsF.sub.6 ; a,b=0,1; m=1-4; n=0,1).
Abstract translation:在一种或多种催化剂存在下,通过使胺与醇和CO 2 O 2的混合气体反应制备氨基甲酸酯的方法,所述催化剂选自具有结构式为Cu [NCMe4] X,K [CuX2], [CuX(S)](其中X = Cl,Br或I; S =溶剂)或具有结构式为[Cu(CO)XaLb] mYn的羰基的一价铜化合物(其中,X = CF 3 CO 2, HB(pz)3(其中,pz =吡唑基,C3H3N2),LBF2,{LBF2 =二氟-3,3' - (三亚甲基二亚硝基)双(2-丁酮肟基)硼酸酯}; L =烯,二烯; Y = BPh4, AsF6; a,b = 0,1; m = 1-4; n = 0,1)。