Korea Advanced Institute of Science and Technology

Lucky Limited

Seong-Ihl Woo

Young-soo Ko

Do-Kyoung Kim

Jong-Seob Kim

Won-Choon Choi

Ki-Su Ro

Kwang-Ho Park

Do-Heui Kim

Jin-Do Kim

The present invention relates to a catalyst for automotive lean-burn engine comprising platinum impregnated on a zeolite support and a process for preparing the same. In accordance with the invention, the catalyst comprising a platinum-impregnated zeolite support can be prepared by sublimation, where the zeolite support effectively eliminates hydrocarbons from automotive exhaust gases by adsorption, and platinum as an active component of the catalyst exerts its catalytic activity through the direct decomposition of nitrogen oxides contained in automotive exhaust gases. Furthermore, the catalyst of the invention provides a widened temperature window for maximum catalytic activity and improved catalytic activity, compared to those of the conventional catalysts. Accordingly, the invented catalyst for automotive lean-burn engine can effectively remove polluting substances such as nitrogen oxides and hydrocarbon present in lean-burn exhaust gases by selective reduction in a continuous reactor, and may be useful in the post-treatment of automotive exhaust gases.

Catalyst for automotive lean-burn engine and process for preparing the same

The present invention provides a process for preparing a highly active metallocene catalyst by which polyolefin having improved properties can be prepared with a small amount of cocatalyst. A process for preparing a metallocene catalyst of the invention comprises the steps of: modifying the surface of a zeolite or molecular sieve inorganic carrier possessing crystalline pores of 7 to 100 .ANG. size by the addition of an organic solvent and organic aluminum compound under an environment of inert gas and reacting at a constant temperature, and drying; and, impregnating a metallocene compound into the inorganic carrier by the addition of an organic solvent and said metallocene compound, whose diameter is smaller than the diameters of said pores of the inorganic carrier, to the inorganic carrier and reacting at a constant temperature, and drying. In accordance with the present invention, a highly active metallocene catalyst can be prepared in an economical and efficient manner.

Process for preparing metallocene catalyst for polyolefin polymerization

The present invention relates to a novel multicomponent oxide catalyst, more specifically, a highly active and selective catalyst composition which plays a vital role to produce unsaturated nitrile compounds by reacting paraffinoid hydrocarbons with ammonia and oxygen. The formula of catalyst composition of the present invention is represented as A.sub.a B.sub.b C.sub.c D.sub.d In.sub.e Ga.sub.f Bi.sub.g Mo.sub.i O.sub.x. wherein:

Multicomponent oxide catalyst

The present invention relates to a novel oxide catalyst, more specifically, a novel modified magnesium oxide catalyst which is highly active and selective for ortho-alkylation of phenol. The catalysts for phenol alkylation of the invention are represented as Mg.sub.a Mn.sub.b L.sub.c T.sub.d Q.sub.e O.sub.x .

Modified magnesium oxide catalyst

Olefins are hydroformylated to aldehyde in the presence of polymer immobilized rhodium catalysts. These catalysts are suit for the hydroformylation of olefins in the organic solvent or in the aqueous phase.

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Seoul, South Korea

Seong-Ihl Woo