Abstract:
PURPOSE: The modified nickel-alumina catalyst for selective hydrogenation of diolefins of the present invention is manufactured by surface modifying gamma-alumina support with one element selected from zirconium, lanthanum and tin, and then it is further supported by nickel. CONSTITUTION: In a modified nickel-alumina catalyst for selective hydrogenation of diolefins that is manufactured by surface modifying gamma-alumina support with one element selected from zirconium, lanthanum and tin, and then it is further supported by nickel, the present invention is characterized in that gamma-alumina support is supported by one element selected from zirconium, lanthanum and tin in an amount of 0.2 to 10 wt.% and nickel in an amount of 0.5 to 10 wt.%, based on the weight of the gamma-alumina support. Before the modified nickel-alumina catalyst is used to convert diolefins to corresponding mono olefins through selective hydrogenation reaction, the modified nickel-alumina catalyst should undergo reduction stage at 400-500deg.C and pretreatment at 300-450deg.C in H2S gas atmosphere.
Abstract:
PURPOSE: Provided is a multifunctional oxidation catalysts, which can remove chlorinated volatile organic compounds at low temperatures of 20 to 220°C as well as minimize generation of another forms of chlorinated volatile organic compounds after reaction. CONSTITUTION: The present invention is characterized in that sulfated metal oxide support is impregnated with (i) as active species, 0.5-2.0 wt.% of one novel metal selected from Pt, Pd, Ir and Rh; (ii) as subsidiary active species, Cu 2.0-10.0 wt.%, Ni 0.1-1.0 wt.%. The sulfated metal oxide support is selected from zirconia, titania and ceria containing SO4 in an amount of 0.3 to 2.3 wt.%. And a porous molecular sieve material is used as support, together with the sulfated metal oxide support within the range of less than 50%. The porous molecular sieve material, such as protonic zeolite or ammonium zeolite, is selected from BEA, MFI, MOR and FAU zeolite with a Si/Al ratio within the range of 10 to 100.
Abstract:
PURPOSE: Title compounds are directly prepared by hydrogen and oxygen, not using perhydroxide in the presence of binary catalyst. CONSTITUTION: Title compounds are prepared by hydrogen and oxygen at -10- 60°C, atmospheric pressure in the presence of binary catalyst comprising zeolite catalyst including VIII-B transition metals and alkyl anthraquinone derivatives and zeolite catalyst containing the transition metal having tetrahedron coordinated structures. Thus, 15 ml benzene and 15 ml acetic acid are mixed in the velocity of 16 ml/min of hydrogen and oxygen at 60°C for 5 hours to give a phenol.
Abstract:
본 발명은 성분금속염에 유기산과 디히드록시 알콜 화합물을 첨가하여 얻어진 금속착염용액에 고표면적을 갖는 알루미늄 및 실리콘 함유 담체를 첨가하여 상온에서 액상으로 혼합하고 이를 70~150℃에서 감압증류 및 극초단파를 이용, 건조하여 겔화시킨 후에 300~700℃의 소성온도에서 열처리하여 혼합 금속산화물이 무정형으로 또 고표면적으로 담체에 균일하게 분산되어 있는 하기 식(Ⅰ)으로 표시되는 질소 산화물 제거 및 탄화수소 연소화반응에 촉매활성이 있는 혼합 금속산화물 담지촉매의 제조방법 : (A a O x ·B b O y )·(C c O z ·C' c' O Z' )/S (Ⅰ) 상기 식에서, A와 B는 란탄계열 금속 또는 알칼리금속 또는 알카리토금속이고, C와 C ' 는 제1주기 전이금속 또는 귀금속이고, a, b, c 및 c ' 는 양론적으로 0 내지 1의 값을 가지며, a+b=1, c+c ' =1이고 또〔a+b〕대 〔c+c ' 〕의 비율은 0.1~3.0:1.0의 범위이고, S는 제올라이트, 알루미나, 실리카, 알루미나-실리카 등의 알루미늄 및/또는 실리콘 함유 담체에 관한 것이다.
Abstract:
Synthetic gas is prepared by continuously reacting carbon dioxide with low grade hydrocarbon or natural gas containing methane and oxygen or steam in a mole ratio of 2:1-5:1 in the presence of a catalyst that comprises nickel, alkali and alkali earth metals supported on silicone such as zeolite, silica, silicate or silica-alumina at 600-1,000deg.C and 0.5-20 atms and a space velocity of 1,000-500,000. The ratio of carbon monoxide to hydrogen in the synthetic gas is 1:2-2:1.
Abstract:
본 발명은 술폰화 셀룰로오스, 이를 이용한 수소이온 전도성 고분자 전해질 막 및 이를 구비하는 연료전지에 관한 것으로, 더욱 구체적으로는 기계적 특성과 화학적 안정성이 우수한 셀룰로오스 백본에 화학적 기능화를 통해 술폰기를 말단에 도입함으로서 상용 고분자 전해질 막에 비해 향상된 이온전도도를 가지는 술폰화 셀룰로오스, 이를 이용한 수소이온 전도성 고분자 전해질 막 및 이를 포함하는 연료전지에 관한 것이다.