Abstract: New types of photocatalyst materials are disclosed together with methods for preparing and using these materials, as well as air treatment systems incorporating such materials. The photocatalyst materials of this invention consist essentially of very small particles of a first-metal oxide, the first-metal being a metal that exhibits photo-induced semiconductor properties, having ions of a second-metal dispersed throughout its lattice structure, the second-metal being selected from the group of dopant metals. Such photocatalyst materials are prepared by the steps of mixing first-metal and second-metal precursors, removing nonessential ions from the mixture, drying the resulting product, and calcinating the dried product to produce the completed photocatalyst material.

Abstract: New types of photocatalyst materials are disclosed together with methods for preparing and using these materials, as well as air treatment systems incorporating such materials. The photocatalyst materials of this invention consist essentially of very small particles of a first-metal oxide, the first-metal being a metal that exhibits photo-induced semiconductor properties, having ions of a second-metal dispersed throughout its lattice structure, the second-metal being selected from the group of dopant metals. Such photocatalyst materials are prepared by the steps of mixing first-metal and second-metal precursors, removing nonessential ions from the mixture, drying the resulting product, and calcinating the dried product to produce the completed photocatalyst material.

Abstract: The present invention relates to a process for preparing a highly active metallocene catalyst supported on polymer bead for olefin polymerization, a metallocene catalyst prepared by the said process and a method for alkylene polymerization by employing the said catalyst. The process for preparing a highly active metallocene catalyst supported on polymer bead for olefin polymerization which comprises the steps of: dissolving divinylbenzene, vinylbenzylchloride, and an initiator in an organic solvent, mixing it with a suspension stabilizer of aqueous phase, and carrying out suspension-polymerization at the temperature of 40 to 80° C. to obtain polystyrene; swelling the polystyrene in dialcoholamine dissolved in an organic solvent at ambient temperature for 1 to 3 days, to give a polymer having a functional group of dialcoholamine; and, reacting the polymer with a metallocene compound (CpM*Cl3) dissolved in an organic solvent.

Abstract: The present invention relates to a process for preparing a highly active metallocene catalyst supported on polymer bead for olefin polymerization, a metallocene catalyst prepared by the said process and a method for alkylene polymerization by employing the said catalyst. The process for preparing a highly active metallocene catalyst supported on polymer bead for olefin polymerization which comprises the steps of: dissolving divinylbenzene, vinylbenzylchloride, and an initiator in an organic solvent, mixing it with a suspension stabilizer of aqueous phase, and carrying out suspension-polymerization at the temperature of 40 to 80° C. to obtain polystyrene; swelling the polystyrene in dialcoholamine dissolved in an organic solvent at ambient temperature for 1 to 3 days, to give a polymer having a functional group of dialcoholamine; and, reacting the polymer with a metallocene compound (CpM*Cl3) dissolved in an organic solvent.

Abstract: The present invention relates to a process for preparing post-crosslinked polymer bead with increased surface area and pore volume, and suitable pore size, allowing the separation of organic compounds by post-crosslinking gel-type copolymer bead whose crosslinking degree is low and initial surface area is small, or macroporous-type copolymer bead whose crosslinking degree is high and initial surface area is intermediate in the presence of a Friedel-Crafts catalyst, and polymer beads produced thereby. Though the surface area and pore volume of polymer beads may be varied depending on physical properties of copolymer beads and Friedel-Crafts reaction conditions, the present invention provides polymer beads with larger surface area than that of commercially available polymeric adsorbents produced by the conventional method employing a porogen only.

Abstract: The present invention relates to a process for preparing metal containing bi-functional catalyst for dewaxing and metal containing bi-functional catalysts prepared by the process. The process for preparing metal containing bi-functional catalyst of the invention comprises the steps of: reacting silica with aqueous alkali metal solution to obtain aqueous alkali metal silicate solution, adding the aqueous alkali metal silicate solution to a template in a dropwise, followed by hydrothermal synthesis to obtain MCM-41 support, calcining precipitate formed by mixing the MCM-41 support with Al precursor to obtain Al-MCM-41 and, incorporating metal followed by calcination. The metal containing bi-functional catalyst catalyzes isomerization rather than cracking in the conversion of n-hexadecane, which makes possible its practical usage as a dewaxing catalyst of lubricating oil and diesel oil.

Abstract: The present invention provides a hybrid catalyst which is prepared by mixing a methanol synthesis catalyst with SAPO-type zeolite as a methanol conversion catalyst, and a process for the preparation of hydrocarbons from carbon dioxide by using the hybrid catalyst. The hybrid catalyst of the invention can be used for preparing hydrocarbons having a carbon number of more than 2 from carbon dioxide under a relatively on the hydrocarbons produced. Therefore, the hybrid catalyst may be used for preparing various high-valued hydrocarbons from an ubiquitous carbon source of carbon dioxide.

Abstract: The present invention relates to a heterogeneous polyimide-supported transition metal complex catalyst for epoxidation of olefin, which is prepared by impregnating a heat- and acid-resistant polyimide resin with a homogeneous metal catalyst of molybdenum, vanadium, tungsten or titanium, and a process for preparing epoxy compounds using the same. The heterogeneous polyimide-supported transition metal complex catalyst of the invention provides superior catalytic activity, selectivity and stability in the epoxidation of higher olefin. Further, the catalyst of the invention has strong resistance against heat and acid. Besides, the catalyst of the invention may provide the following advantages which are critical in industrial use: it permits relatively high yield of epoxy compounds; and, it can be easily separated from the reaction product, which eases recycling of the catalyst.

Abstract: The present invention relates to a process for preparing cobalt metals by reducing cobalt oxides with ammonia or nitrogen/hydrogen gas mixtures. In accordance with the present invention, a cobalt metal is economically prepared by reacting a cobalt oxide with a nitrogen reductant at a temperature of 300 to 550.degree. C. for 3 to 7 hours, where the nitrogen reductant is injected into a reactor containing the cobalt oxide at a flow rate of 300 to 700 cc/min, preferably 500 cc/min per 1 g of cobalt oxide, while continuously elevating the temperature of the reactor at a rate of 3 to 7.degree. C./min, most preferably 5.degree. C./min.

Abstract: A method for preparing an improved porous polymer bead which comprises the following steps: introducing a mixture comprising a purified monomer, initiator and pore-forming agent into a 4-necked reactor with a suspension stabilizer and aqueous solution, suspending the mixture to provide homogeneous organic droplets at a temperature sufficiently low so as not to decompose the initiator, increasing the temperature gradually to a final reaction temperature and maintaining the temperature at the final temperature to react completely by suspension-polymerization the monomers in the individual organic droplet to provide the porous polymer bead, separating the bead, washing the bead with water, acetone and tetrahydrofuran, successively, and drying the bead, precipitating the bead in a solution mixed with monomer nd thinner to fill the pores of the porous bead with the diluted monomers, and introducing in a 4-necked reactor with a suspension stabilizer and aqueous solution, and by suspension-polymerization again, to c