Provided are a noble metal-transition metal complex catalyst supported on a carbon-coated silica-alumina support and a preparation method therefor, the catalyst being capable of obtaining a fast reaction rate and catalyst stability, as compared to a conventional catalyst, when cyclohexane dimethanol (CHDM) production is carried out by a cyclohexane dicarboxylic acid (CHDA) hydrogenation reaction in an aqueous solution by using a carbon-coated supported catalyst.

A method for the selective cleavage of a compound comprising an aromatic ring and a COC linkage in the presence of a heterogeneous catalyst is provided. The heterogenous catalyst may be a supported noble metal catalyst doped with a halogen selected from the group consisting of chlorine and bromine. By using this method, it is possible to increase the selectivity and/or yield (preferably both) of aromatic compounds.

A method for the selective cleavage of a compound comprising an aromatic ring and a COC linkage in the presence of a heterogeneous catalyst is provided. The heterogenous catalyst may be a supported noble metal catalyst doped with a halogen selected from the group consisting of chlorine and bromine. By using this method, it is possible to increase the selectivity and/or yield (preferably both) of aromatic compounds.

The present invention relates to a method for manufacturing a heterogeneous metal hydrogenation catalyst. More specifically, the present invention is characterized in that when the hydrogenation catalyst is reduced using a specific reducing gas in a proper reducing condition, the hydrogenation reaction of the catalyst is improved.

The present invention relates to a method for manufacturing a heterogeneous metal hydrogenation catalyst. More specifically, the present invention is characterized in that when the hydrogenation catalyst is reduced using a specific reducing gas in a proper reducing condition, the hydrogenation reaction of the catalyst is improved.

The present invention relates to a method for preparing high-purity 1,3-cyclohexanedimethanol capable of achieving a high conversion rate by allowing most of the reactant to participate in the reaction, and of increasing reaction efficiency and economic efficiency by further simplifying the reaction process, while minimizing by-products within a shorter period of time.

Specifically, the method for preparing 1,3-cyclohexanedimethanol includes reducing 1,3-cyclohexanedicarboxylic acid in the presence of a metal catalyst, which is fixed to a silica support and includes a ruthenium (Ru) compound, a tin (Sn) compound and a platinum (Pt) compound in a weight ratio of 1:0.8 to 1.2:1.2 to 2.4.

The present invention relates to a method for preparing high-purity 1,3-cyclohexanedimethanol capable of achieving a high conversion rate by allowing most of the reactant to participate in the reaction, and of increasing reaction efficiency and economic efficiency by further simplifying the reaction process, while minimizing by-products within a shorter period of time.

Specifically, the method for preparing 1,3-cyclohexanedimethanol includes reducing 1,3-cyclohexanedicarboxylic acid in the presence of a metal catalyst, which is fixed to a silica support and includes a ruthenium (Ru) compound, a tin (Sn) compound and a platinum (Pt) compound in a weight ratio of 1:0.8 to 1.2:1.2 to 2.4.

This invention relates to the continuous production of 1,4-cyclohexane dimethanol (CHDM) and optionally and additionally of 1,4-cyclohexane dicarboxylic acid (CHDA) directly using terephthalic acid (TPA) as the raw material. More specifically, this invention relates to a method and system for continuous production of CHDM and CHDA that features direct use of TPA as feedstock, promotes efficient use of solvent and energy, and provides products with the desired high trans isomer content, by exploiting unexpected features of the thermodynamic phase behavior and the reaction mechanisms.

This invention relates to the continuous production of 1,4-cyclohexane dimethanol (CHDM) and optionally and additionally of 1,4-cyclohexane dicarboxylic acid (CHDA) directly using terephthalic acid (TPA) as the raw material. More specifically, this invention relates to a method and system for continuous production of CHDM and CHDA that features direct use of TPA as feedstock, promotes efficient use of solvent and energy, and provides products with the desired high trans isomer content, by exploiting unexpected features of the thermodynamic phase behavior and the reaction mechanisms.

Iron-based homogeneous catalysts, supported by pincer ligands, are employed in the transfer hydrogenation of esters using C.sub.2-C.sub.12 alcohols as sacrificial hydrogen donors to produce corresponding alcohols from the esters. No external H.sub.2 pressure is required. The reaction can be carried out under ambient pressure.