The present invention provides a catalyst, comprising molybdenum; one or more first elements selected from a Group V, VI, VII, VIII, IX, X, and XI metal (e.g., silver, cobalt, nickel, copper, rhodium, ruthenium, iridium, palladium, niobium, and manganese); one or more second elements selected from sulfur, carbon, oxygen, phosphorus, nitrogen, and selenium; and optionally, one or more Group IA metals, wherein the molybdenum is present in an amount of 10-50 wt. % of the total amount of the one or more first elements, the molybdenum, the one or more second elements, and the Group IA metal, and methods of using said catalyst in the production of ethanol from carbon dioxide.

The present invention provides a catalyst, comprising molybdenum; one or more first elements selected from a Group V, VI, VII, VIII, IX, X, and XI metal (e.g., silver, cobalt, nickel, copper, rhodium, ruthenium, iridium, palladium, niobium, and manganese); one or more second elements selected from sulfur, carbon, oxygen, phosphorus, nitrogen, and selenium; and optionally, one or more Group IA metals, wherein the molybdenum is present in an amount of 10-50 wt. % of the total amount of the one or more first elements, the molybdenum, the one or more second elements, and the Group IA metal, and methods of using said catalyst in the production of ethanol from carbon dioxide.

The present invention relates to a monolith catalyst for carbon-dioxide/methane reforming and a method of manufacturing the same, and more particularly to a novel monolith catalyst for a reforming reaction having improved thermal durability, configured such that a sintering inhibiting layer is formed by coating the surface of a monolith support with at least one element selected from the group consisting of Group 2, 3, 6, 13, 15 and 16 elements among elements in Period 3 or higher and an active catalyst layer is formed on the sintering inhibiting layer, thereby preventing carbon deposition and catalyst deactivation due to deterioration even upon reaction at high temperatures.

The present invention relates to a monolith catalyst for carbon-dioxide/methane reforming and a method of manufacturing the same, and more particularly to a novel monolith catalyst for a reforming reaction having improved thermal durability, configured such that a sintering inhibiting layer is formed by coating the surface of a monolith support with at least one element selected from the group consisting of Group 2, 3, 6, 13, 15 and 16 elements among elements in Period 3 or higher and an active catalyst layer is formed on the sintering inhibiting layer, thereby preventing carbon deposition and catalyst deactivation due to deterioration even upon reaction at high temperatures.

The object of the present invention is to provide a method which provides a diaminobiphenyl compound in a high yield and in a short period of time by a benzidine rearrangement reaction of a hydrazobenzene having a bulky substituent group at the meta position. Specifically, the present invention provides a method for preparing a diaminobiphenyl compound represented by the following formula (1):

##STR00001##

wherein, X.sub.1 and X.sub.2 are, independently of each other, a group selected from the group consisting of a trifluoromethyl group and, optionally fluorinated, isopropyl, isobutyl, sec-butyl, tert-butyl and neopentyl groups, comprising a step of subjecting a diphenylhydrazine compound represented by the following formula (2)

##STR00002##

wherein X.sub.1 and X.sub.2 are as defined above,
to a benzidine rearrangement reaction in the presence of an organic solvent and an inorganic acid at a temperature of from −70° C. to −11° C.
to obtain the diaminobiphenyl compound represented by the formula (1).

The object of the present invention is to provide a method which provides a diaminobiphenyl compound in a high yield and in a short period of time by a benzidine rearrangement reaction of a hydrazobenzene having a bulky substituent group at the meta position. Specifically, the present invention provides a method for preparing a diaminobiphenyl compound represented by the following formula (1):

##STR00001##

wherein, X.sub.1 and X.sub.2 are, independently of each other, a group selected from the group consisting of a trifluoromethyl group and, optionally fluorinated, isopropyl, isobutyl, sec-butyl, tert-butyl and neopentyl groups, comprising a step of subjecting a diphenylhydrazine compound represented by the following formula (2)

##STR00002##

wherein X.sub.1 and X.sub.2 are as defined above,
to a benzidine rearrangement reaction in the presence of an organic solvent and an inorganic acid at a temperature of from −70° C. to −11° C.
to obtain the diaminobiphenyl compound represented by the formula (1).

A carbon-based solid acid catalyst, a preparation method of the catalyst, and a method to use the catalyst for hydrothermal conversion of biomass are provided. The preparation method of the carbon-based solid acid catalyst includes the following steps: S1. mixing pectin with water, adding concentrated sulfuric acid for activation, and adding a resulting mixture to an ionic resin with an aromatic ring matrix; S2. drying a material obtained in S1, crushing a dried material into a powder, and subjecting the powder to pyrolysis in a dry inert gas; S3. subjecting a solid obtained after the pyrolysis to sulfonation with concentrated sulfuric acid; S4. diluting a material obtained in S3 with water, filtering a resulting mixture, and washing a resulting filter residue with water until no sulfate ions are detected in washing water; S5. drying the filter residue.

A carbon-based solid acid catalyst, a preparation method of the catalyst, and a method to use the catalyst for hydrothermal conversion of biomass are provided. The preparation method of the carbon-based solid acid catalyst includes the following steps: S1. mixing pectin with water, adding concentrated sulfuric acid for activation, and adding a resulting mixture to an ionic resin with an aromatic ring matrix; S2. drying a material obtained in S1, crushing a dried material into a powder, and subjecting the powder to pyrolysis in a dry inert gas; S3. subjecting a solid obtained after the pyrolysis to sulfonation with concentrated sulfuric acid; S4. diluting a material obtained in S3 with water, filtering a resulting mixture, and washing a resulting filter residue with water until no sulfate ions are detected in washing water; S5. drying the filter residue.

Disclosed herein are methods for the preparation of porous metal oxide materials, including metal oxide xerogels and metal oxide aerogels. Methods for preparing porous metal oxide materials can comprise (i) reacting a metal alkoxide with water in the presence of a catalyst system to form a partially hydrolyzed sol, (ii) contacting the partially hydrolyzed sol with a base catalyst and a non-aqueous solvent to form a precursor gel; and (iii) drying the precursor gel to form the porous metal oxide material. The catalyst system employed in step (i) comprises a combination of a weak acid and a strong acid.

Disclosed herein are methods for the preparation of porous metal oxide materials, including metal oxide xerogels and metal oxide aerogels. Methods for preparing porous metal oxide materials can comprise (i) reacting a metal alkoxide with water in the presence of a catalyst system to form a partially hydrolyzed sol, (ii) contacting the partially hydrolyzed sol with a base catalyst and a non-aqueous solvent to form a precursor gel; and (iii) drying the precursor gel to form the porous metal oxide material. The catalyst system employed in step (i) comprises a combination of a weak acid and a strong acid.