Abstract: The present invention relates to a method for catalytic dehydrogenation of alkylaromatic hydrocarbons and more particularly, to a method for catalytic dehydrogenation of alkylaromatic hydrocarbons using carbon dioxide as a soft oxidant in the presence of a heterogeneous catalyst comprising both vanadium and iron, which allows operation at a lower reaction temperature due to improve thermodynamic equilibrium and provides an enhanced conversion of hydrocarbons and energy saving.

Abstract: The present invention relates to a composition of metal-incorporated VSB-5 molecular sieve with nanopores and its preparation method, in particular, to a composition of a metal-incorporated VSB-5 molecular sieve with a framework of VSB-5 molecular sieve comprising nickel, phosphorous, oxygen and metal, which is useful in various fields such as a hydrogen storage material, an optical and electric/electronic material, a sensor, a catalyst, a catalyst supporter and an adsorbent, and its preparation method performed in such a manner that a specific metal component is added in a predetermined mole ratio to a reaction mixture comprised of nickel and phosphorous compounds and the resultant mixture is crystallized in the presence of inorganic or organic base as a pH modifier to yield a metal-incorporated VSB-5 molecular sieves in an economical and efficient manner.

Abstract: The present invention relates to a process for preparing nanoporous VSB-5 molecular sieves, and more particularly, to a process for preparing nanoporous VSB-5 molecular sieves useful as a hydrogen storage material, a catalyst, a catalyst supporter and an adsorbent, performed in such a manner that low-cost inorganic base or monoamine instead of a template essential in the conventional process is, as a pH modifier, incorporated into raw materials comprised of nickel and phosphorous compounds and crystallized to give VSB-5 molecular sieves in an economical and efficient manner.

Abstract: A modified ⊖-Al2O3-supported nickel reforming catalyst and its use for producing synthesis gas from natural gas, more specifically to a nickel reforming catalyst expressed by the following formula 1, having improved coke resistance, high-temperature catalysis stability and catalytic activity, which is prepared by coating nickel or mixture of nickel and cocatalyst (M1-M2-Ni) on a Al2O3 support modified with metal (M3-M4-ZrO2/⊖-Al2O3), and its use for producing synthesis gas from natural gas through steam reforming, oxygen reforming or steam-oxygen reforming, M1-M2-Ni/M3-M4-ZrO2/⊖-Al2O3  (1) wherein M1 is an alkali metal; each of M2 and M3 is an alkaline earth metal; and M4 is a IIIB element or a lanthanide.

Abstract: The present invention relates to a modified &thgr;-Al2O3-supported nickel reforming catalyst and its use for producing synthesis gas from natural gas, more specifically to a nickel reforming catalyst expressed by the following formula 1, having improved coke resistance, high-temperature catalysis stability and catalytic activity, which is prepared by coating nickel or mixture of nickel and cocatalyst (M1-M2-Ni) on a &thgr;-Al2O3 support modified with metal (M3-M4-ZrO2/&thgr;-Al2O3), and its use for producing synthesis gas from natural gas through steam reforming, oxygen reforming, or steam-oxygen reforming,

Abstract: A modified &thgr;-Al2O3-supported nickel reforming catalyst and its use for producing synthesis gas from natural gas, more specifically to a nickel reforming catalyst expressed by the following formula 1, having improved coke resistance, high-temperature catalysis stability and catalytic activity, which is prepared by coating nickel or mixture of nickel and cocatalyst (M1—M2—Ni) on a &thgr;-Al2O3 support modified with metal (M3—M4—ZrO2/&thgr;-Al2O3), and its use for producing synthesis gas from natural gas through steam reforming, oxygen reforming or steam-oxygen reforming, M1—M2—Ni/M3—M4—ZrO2/&thgr;-Al2O3  (1) wherein M1 is an alkali metal, each of M2 and M3 is an alkaline earth metal; and M4 is a IIIB element or a lanthanide.

Abstract: Disclosed is a plate type steam reformer comprising a plate type burner capable of heating a broad area of a reactor as a heat source, positioned on a bottom of the reformer; a reforming reactor requiring a relatively high temperature, positioned over the burner; a high temperature water gas shift reactor requiring a relatively moderate temperature, positioned over the reforming reactor; a low temperature water gas shift reactor requiring a relatively low temperature, positioned over the high temperature water gas shift reactor; and dividing plates positioned between the above three reactors and between the reforming reactor and the burner such that combustion exhaust gas produced in the burner supplies heat to the above reactors.

Abstract: The present invention relates to a method for catalytic dehydrogenation of alkylaromatic hydrocarbons and more particularly, to a method for catalytic dehydrogenation of alkylaromatic hydrocarbons using carbon dioxide as a soft oxidant in the presence of a heterogeneous catalyst comprising both vanadium and iron, which allows operation at a lower reaction temperature due to improved thermodynamic equilibrium and provides an enhanced conversion of hydrocarbons and energy saving.

Abstract: The present invention relates to a novel titania photocatalyst and its manufacturing method. More specifically, the present invention is to provide the quantum-sized novel titania photocatalyst prepared the steps comprising: (a) titanium tetraisopropoxide is encapsulated in zeolite support by adding citric acid to isopropyl alcohol; (b) ethylene glycol is dissolved herein to obtain a uniformly dispersed mixture solution; and (c) it is encapsulated in zeolite cavities.

Abstract: The present invention provides a method for preparing a catalyst for the reduction of nitrogen oxides by the use of natural gas as a reducing agent in an excess oxygen atmosphere, which comprises of filling zeolite with an organic compound having molecular weight of 100˜250 prior to loading catalytically active noble metal components on a zeolite. Since the method according to the present invention supports catalytic active noble metal components on a zeolite under the condition that the pores of zeolite are filled with organic compounds, the noble metal component, which is essential for forming highly active NOx reduction catalyst, can be supported precisely on the desired positions of zeolite pores. Therefore, the NOx reduction catalysts prepared by the present invention are very useful for the purification of exhaust gas in an excessive oxygen atmosphere such as gas turbines, boilers or lean-burn automobiles.

Abstract: The present invention relates to a modified &thgr;-Al2O3-supported nickel reforming catalyst and its use for producing synthesis gas from natural gas, more specifically to a nickel reforming catalyst expressed by the following formula 1, having improved coke resistance, high-temperature catalysis stability and catalytic activity, which is prepared by coating nickel or mixture of nickel and cocatalyst (M1—M2—Ni) on a &thgr;m-Al2O3 support modified with metal (M3—M4—ZrO2/&thgr;-Al2O3), and its use for producing synthesis gas from natural gas through steam reforming, oxygen reforming or steam-oxygen reforming,

Abstract: The present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by liquid-phase oxidation. More particularly, the present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by oxidation in acetic acid as solvent with oxygen-containing gas in the presence of cobalt/manganese/bromine complex catalyst, wherein nickel and carbon dioxide in an appropriate amount are added to increase an activity of cobalt/manganese/bromine complex catalyst. Especially nickel has a synergistic effect with carbon dioxide and maximize the formation of the desired product having the corresponding carboxylic groups to the number of alkyl groups in a reactant.

Abstract: The present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by liquid-phase oxidation. More particularly, the present invention relates to a method for preparing aromatic carboxylic acid from alkylaromatics by oxidation in acetic acid as solvent with oxygen-containing gas in the presence of cobalt/manganese/bromine complex catalyst, wherein nickel and carbon dioxide in an appropriate amount are added to increase an activity of cobalt/manganese/bromine complex catalyst. Especially nickel has a synergistic effect with carbon dioxide and maximize the to formation of the desired product having the corresponding carboxylic groups to the number of alkyl groups in a reactant.

Abstract: Disclosed is a compact steam reformer which integrally comprises a housing; a reforming reactor having an upper mixing compartment for mixing natural gas and steam and a lower compartment for accommodating a catalyst bed; a natural gas feeding coiled pipe through which natural gas is introduced while being heated; a steam generating coiled pipe in which pure water is converted to steam by the exhaust; a metal fiber burner for heating the reforming reactor; a high-temperature converter for primarily removing carbon monoxide from a synthetic gas; a low-temperature converter for secondarily reducing the carbon monoxide level of the synthetic gas; and a heat exchanger, provided between the high-temperature converter and the low-temperature converter, for cooling the gas effluent from the high-temperature converter. The steam reformer enjoys the advantage of being easy to install in situ and being fabricated at low cost.

Abstract: The present invention relates to a novel titania photocatalyst and its manufacturing method. More specifically, the present invention is to provide the quantum-sized novel titania photocatalyst prepared the steps comprising: (a) titanium tetraisopropoxide is encapsulated in zeolite support by adding citric acid to isopropyl alcohol; (b) ethylene glycol is dissolved herein to obtain a uniformly dispersed mixture solution; and (c) it is encapsulated in zeolite cavities.

Abstract: This invention relates to a continuous microwave synthesis process of inorganic materials and its apparatus and more particularly, to the process of synthesizing inorganic materials prepared in a manner such that after preparing a mixed solution of precursor materials for various inorganic materials such as porous molecular sieve, layered compounds and ceramics, this mixed solution is continuously added to a tube-type microwave reactor using a slurry pump for the synthesis and crystallization of inorganic materials.

Abstract: A process for preparing supported nickel catalyst consisting of supporting nickel or metal salt of nickel, alkali metal, alkaline earth metal having low melting point on silicon and aluminum-containing support having high surface area such as zeolite, silica and alumina as an oxide by melting effectively nickel or metal salt of nickel, alkali metal and alkaline earth metal having low melting point is disclosed. This process is characterized in that the supported nickel catalyst prepared by the present invention can be used in reforming reaction of hydrocarbons by using carbon dioxide, steam and oxygen as an oxidant. Metal salts used in the preparation of supported nickel catalyst is generally nitrate, chloride, acetate and carbonate having low melting point of 500° C. or less. The contents of nickel, alkali metal and alkaline earth metal of the catalyst are 1 to 20% by weight, 10% by weight or less and 20% by weight or less, respectively.

Abstract: The present invention relates to a process for preparing hydroxylated aromatics by using hydrogen and oxygen and more particularly, to a process for preparing hydroxylated aromatics by using hydrogen and oxygen with a two-component heterogeneous catalyst. One component consists of porous catalyst containing one of Group VIII B transition metals such as Pd, Pt, Au and Cu, and hydrogen transfer organic compounds such as anthraquinone. The other component consists of a catalyst containing a transition metal selected from Ti, V, and Sn with tetrahedral coordination geometry. The main advantages of this new catalytic system are to 1) overcome the drawbacks of liquid phase oxidation using conventional homogeneous catalysts, 2) avoid use of expensive hydrogen peroxide as an oxidant, and 3) improve the selectivity of the reaction.

Abstract: The invention herein relates to a catalyst for enhancing the conversion of the dehydrogenation reaction of aromatic hydrocarbons such as ethylbenzene under a flow of carbon dioxide, which is expressed by the following formula I, wherein a catalyst in which an active component of iron oxides is highly dispersed onto a zeolite, activated charcoal, .gamma.-alumina or silica carrier. Further, the invention relates to a dehydrogenation method of aromatic hydrocarbons by means of using said catalyst:(Fe.sup.II.sub.x Fe.sup.III.sub.y O.sub.z)/S (I)wherein S denotes a zeolite, activated charcoal, .gamma.-alumina or silica carrier, and the initial state of iron oxide is as follows:x=0.

Abstract: The invention herein relates to a catalyst for enhancing the conversion of the dehydrogenation reaction of aromatic hydrocarbons such as ethylbenzene under a flow of carbon dioxide, which is expressed by the following formula I, wherein a catalyst in which an active component of iron oxides is highly dispersed onto a zeolite, activated charcoal, .gamma.-alumina or silica carrier. Further, the invention relates to a dehydrogenation method of aromatic hydrocarbons by means of using said catalyst:(Fe.sup.II.sub.x Fe.sup.III.sub.y O.sub.z)/S (I)wherein S denotes a zeolite, activated charcoal, .gamma.-alumina or silica carrier, and the initial state of iron oxide is as follows:x=0.