Abstract:
Provided is a method for preparing a porous organic-inorganic hybrid material which has a nano-sized micropore and is used to encapsulate a small guest molecule or to separate a large molecule. The method comprises the steps of stirring a metal material and an organic material in the presence of a solvent with a velocity of 50-2,000 rpm for 1-600 min or irradiating an ultrasonic wave of 15,000 Hz to 30 MHz to the mixture for 1-600 min, to prepare a reaction solution where a crystal nucleus is formed; and irradiating a microwave of 1-30 GHz to the obtained reaction solution containing a crystal nucleus at a temperature of 100-250 deg.C. Preferably the organic material is an organic compound capable of coordinating with the metal material.
Abstract:
본 발명은 텅스텐산화물이 치환된 티타늄산화물 친수성 박막의 제조방법에 관한 것으로, 구체적으로 10 중량% 이하의 텅스텐 할로겐화물과 티타늄 알콕사이드로 이루어진 혼합물을 킬레이팅제에 용해시켜 졸 상태의 텅스텐-티타늄 전구체 용액을 제조하는 단계(단계 1), 상기 졸 용액을 기질의 표면 위에 코팅하는 단계(단계 2), 상기 코팅된 기질을 350∼500℃에서 열처리하여 무정형 WO 3 -TiO 2 복합산화물을 형성시키는 단계(단계 3)를 포함하는 것으로 이루어진 친수성 박막의 제조방법에 관한 것이다. 본 발명의 제조방법은 킬레이팅제를 이용함으로써 가수분해 속도를 조절하고, 열처리 온도를 낮추어 수십 나노미터의 입자 크기를 갖는 균일한 복합산화물 박막을 제조할 수 있으며, 낮은 온도에서 소결함으로써 유리 또는 세라믹 등 다양한 기질 표면에 코팅할 수 있을 뿐만 아니라 저렴한 가격으로 제조할 수 있다. 또한 상기 제조방법의 의해 제조된 박막은 자외선 조사 후 장시간 동안 친수성을 유지할 수 있다. 친수성, 초친수성, WO3, TiO2, 복합산화물, 안티포깅
Abstract:
PURPOSE: Provided are a selective hydrogenation catalyst and a selective hydrogenation process of diolefin compound using the catalyst. The above catalyst is tetragonal Ni/Zr type and is used in the selective hydrogenation of diolefin compounds that are contained in the carbohydrate mixtures into mono-olefin compounds. CONSTITUTION: The preparation method of the above catalyst comprises: 0.1-5wt.% (based on the hydrate) of Ni alone or having 0.1-5mol.% (based on Zr carrier) of a cocatalyst selected from Pd, Pt, Ag, Cu, Mo and B and its carrier of Zr alone or modified by one metal chosen from Ca, lanthanide metals such as Se and La, IIIB group metal(silicone) or IVB group metal(Al). The above selective hydrogenation is conducted in the temperature range of 80 to 250°C at a pressure of 1 to 12 atm. and at space velocity of 4 to 12/h (based on the volume of liquid reactant).
Abstract:
PURPOSE: Provided is a direct preparation method of hydrogen peroxide, which is characterized in that the hydrogen carrier quinone and its derivatives are fixed to the channels of zeolite by anchoring and grafting method and the product is made in aqueous solution. Usual process uses solvent dissolving quinone and hydroquinone and in the above process the quinones are fixed to the zeolite more than 2 times than the usual process, making the method improved in the stability and reactivity of the catalyst. CONSTITUTION: The method includes the steps of: making the catalyst by anchoring or grafting quinone or its derivatives into the zeolite which is ion-exchanged with VIII group transition metals and carries them; and directly synthesizing hydrogen peroxide at 0-90deg.C by introducing reducing agent and oxygen gas. The above anchoring and grafting is conducted by using as anchoring agent tetrahydrofuran and dicyclohexylcarbodiimide and pre-grafting to zeolite with 3-aminopropyltrimethoxysilane and trimethoxysilylpropyldiethylenetriamine. The above zeolite is selected from Y, Beta, L or MCM-41 structure and Si/Al ratio is 1-160. The cationic form of zeolite is selected from Na, K and H while VIII group transition metal is chosen from Rd, Pt, Rh, Ir, Fe, Cu and Ni. The reducing agent is selected from hydrogen, ammonia and alcohol. The catalyst is washed with benzene, alcohol and acetone, and the acid is added to the above aqueous solution, the acid being chosen from 0.001-1N sulfuric acid, acetic acid and hydrochloric acid.
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:
본 발명은 질화칼륨(Gallium Nitride, GaN)을 집광성 레이저광 여기(coherent laser aided vapour phase epitaxy, LVPE)방법에 의해 육방정계의 부루자이트(Wurtzite) 단결정 격자구조로 피복성장시키는 방법에 관한 것으로서 더욱 상세하게는 기판위에 질화알루미늄(Aluminum nitride, AIN)완충막을 인시츄(in-situ)방법에 의해 도입하고 갈륨 함유 반응물과 질소함유 반응물을 약 800℃의 낮은 온도와 0.1~3.8torr의 낮은 증기압하에서 공명적 에너지 광분해 증착법에 의해 단결정 두께 2~20μm를 갖는 청색 발광성 질화갈륨 적층막(epitaxial film)을 제조하는 방법에 관한 것이다.
Abstract:
본 발명은 알루미나, 티타니아, 실리카 등의 담체에 산화니켈 피막을 입히고 그 위에 루테늄을 나노입자로 담지한 촉매 및 이의 제조방법에 관한 것으로, 보다 상세하게는 알루미나, 티타니아, 실리카 등의 담체에 니켈의 양을 0.5~15 중량%이 되도록 담지하고 그 위에 루테늄의 양이 0.2~15 중량%가 되도록 담지한 담지촉매 및 이의 제조방법에 관한 것이다.
Abstract:
PURPOSE: A manufacturing method of sugar alcohols is provided to continuously manufacture sugar alcohols with high yield through a repeated catalytic hydrogenation of sugars without regeneration of a catalyst. CONSTITUTION: A manufacturing method of sugar alcohols comprises a step of preparing sugar alcohols through a hydrogenation of sugars by using a supported catalyst. The supported catalyst is that ruthenium is supported into a single support or a mixture support selected from silica, alumina, and titania. The support has a coating consisting of nickel metal oxide. The hydrogenation is conducted at the reaction temperature 60-200 °C and reaction pressure of 2-200 MPa. The comprised amount of the ruthenium is 0.2-15 weight% based on the total weight.