A particulate nanocomposite material comprising, as determined by X-ray diffraction (XRD): elemental carbon (C); an orthorhombic magnesium iron borate (MgFe(BO.sub.3)O) crystalline phase; an orthorhombic calcium diborate (CaB.sub.2O.sub.4) crystalline phase; and, a monoclinic magnesium diborate (Mg.sub.2B.sub.2O.sub.5) crystalline phase. The nanocomposite is further characterized in that, based on the total number of atoms in the particulate nanocomposite material and as determined by energy dispersive X-ray spectroscopy (EDX), the atomic concentration of carbon (C) is from about 0.1 atomic percent (atom %) to 5 atom %, the atomic concentration of calcium (Ca) is from about 5 to 15 atom %, the atomic concentration of boron (B) is from about 1 to 10 atom %, the atomic concentration of iron (Fe) is from about 5 to 15 atom %, and the atomic concentration of magnesium (Mg) is from about 5 to 15 atom %.

A catalyst molded body, a production method thereof and a method for preparing cyclic ketone using the same, including: (a) producing a mixed powder including a catalyst powder and a binder; (b) producing a slurry by mixing an aqueous alkali hydroxide solution with the mixed powder; and obtaining a catalyst molded body by molding and heat-treating the slurry.

A catalyst molded body, a production method thereof and a method for preparing cyclic ketone using the same, including: (a) producing a mixed powder including a catalyst powder and a binder; (b) producing a slurry by mixing an aqueous alkali hydroxide solution with the mixed powder; and obtaining a catalyst molded body by molding and heat-treating the slurry.

An integrated catalyst can be used in an olefin disproportionation reaction. The integrated catalyst contains a plurality of different integrated active phases. The relative positions among different active phases remain substantially unchanged during the olefin disproportionation reaction. The effective distance between respective bisecting planes of two adjacent different active phases is 0.5-5 mm, preferably 1-3 mm.

An integrated catalyst can be used in an olefin disproportionation reaction. The integrated catalyst contains a plurality of different integrated active phases. The relative positions among different active phases remain substantially unchanged during the olefin disproportionation reaction. The effective distance between respective bisecting planes of two adjacent different active phases is 0.5-5 mm, preferably 1-3 mm.

A method of hydrogen generation includes contacting sodium borohydride (NaBH.sub.4) and water in the presence of a nanocomposite comprising graphitic C.sub.3N.sub.4, V.sub.2O.sub.5, and MgAl.sub.2O.sub.4 in a mass relationship to each other in a range of from 5 to 15:2 to 7:75 to 95, at a temperature in a range of from 10 to 80 C., thereby catalyzing the hydrogen generation at a hydrogen generation rate in a range of from 2000 to 5000 mL/(min.Math.g).

A method of hydrogen generation includes contacting sodium borohydride (NaBH.sub.4) and water in the presence of a nanocomposite comprising graphitic C.sub.3N.sub.4, V.sub.2O.sub.5, and MgAl.sub.2O.sub.4 in a mass relationship to each other in a range of from 5 to 15:2 to 7:75 to 95, at a temperature in a range of from 10 to 80 C., thereby catalyzing the hydrogen generation at a hydrogen generation rate in a range of from 2000 to 5000 mL/(min.Math.g).

The disclosure relates to catalysts for dry reforming, methods of producing the catalysts, and methods of using the catalysts in dry reforming. The catalysts contain nickel, molybdenum and a metal oxide. The methods of producing the catalysts include adding a solvent to precipitate the catalyst, followed by removing the solvent. The solvent addition and removal steps can be repeated as desired.

The disclosure relates to catalysts for dry reforming, methods of producing the catalysts, and methods of using the catalysts in dry reforming. The catalysts contain nickel, molybdenum and a metal oxide. The methods of producing the catalysts include adding a solvent to precipitate the catalyst, followed by removing the solvent. The solvent addition and removal steps can be repeated as desired.

A method of producing hydrogen gas comprising: hydrolyzing sodium borohydride (NaBH.sub.4) with water at a temperature of from 20 to 75 C. in the presence of a nanocomposite catalyst. The method is characterized in that the ratio by weight of sodium borohydride to the nanocomposite catalyst is from 1:1 to 5:1. Further, the nanocomposite catalyst comprises graphite sheet particles on which are disposed nanorods of -MnO.sub.2 and nanoparticles of MgO.