TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (Claimed): Preparing the mesoporous oxide-catalyst complex comprises: contacting a catalyst metal precursor, a metal oxide precursor, and a solvent to obtain a mixture; forming a mesoporous structure in which a catalyst metal is included in a lattice structure of a metal oxide; calcining the mesoporous structure to obtain a mesoporous metal oxide complex; and selectively reducing a catalyst metal oxides of the mesoporous metal oxide complex. Preferred Components: The catalyst metal comprises a transition metal of nickel (preferred), iron, copper, cobalt, chromium, platinum, palladium, ruthenium or iridium. The mesoporous metal oxide is crystalline. The catalyst metal is contained in an amount of 0.1-40 mass%. The mesoporous metal oxide has: an average mesopore diameter of 1-50 (preferably 4-15) nm; and a surface area of 20 m2/g or greater. The catalyst metal precursor comprises: an alkoxide, a halide, a nitrate, a hydrochloride, a sulfate or an acetate of a transition metal; and a metal ion substituted in the lattice structure of the metal oxide. The catalyst precursor comprises at least one of nickel, iron, copper, cobalt, chromium, platinum, palladium, ruthenium or iridium. The metal oxide precursor comprises an alkoxide, a halide, a nitrate, a hydrochloride, a sulfate or an acetate of at least one metal of a Group 4 element, a Group 5 element, a Group 6 element, aluminum, gallium, indium, thallium, silicon, germanium, tin, lead, phosphorus, arsenic, antimony or bismuth. The mesoporous metal oxide complex comprises a complex comprising nickel(II) oxide and silicon dioxide. The mesoporous oxide-catalyst complex comprises nickel and a complex comprising silicon dioxide. The mesoporous metal oxide comprises: at least one oxide of a metal of a Group 4 element, a Group 5 element, a Group 6 element, aluminum, gallium, indium, thallium, silicon, germanium, tin, lead, phosphorus, arsenic, antimony or bismuth; at least one oxide of at least one of silicon, aluminum, titanium, zirconium, tungsten, molybdenum, vanadium, tantalum, niobium or phosphorus; and at least one of zirconium oxide, silicon dioxide-aluminum oxide, silicon dioxide-zirconium oxide, aluminum oxide-zirconium oxide, or cerium oxide-zirconium oxide. Preferred Method: The calcining is performed at a temperature of 300-1000 degrees C in air for 0.1-30 hours. The reducing is performed at a temperature of 300-1000 degrees C in a gas comprising hydrogen for 0.01-10 hours.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The solvent comprises an alcohol and an aqueous acid. EXAMPLE - Triblock copolymer (4.6 g), hydrochloric acid (1.97 ml), and acetic acid (2.4 g) were added to ethanol (300 ml) at room temperature, and the mixture was stirred to obtain a uniform, mixed solution. Then nickel(II) nitrate hexahydrate precursor (5 mmol) was added to the mixed solution to obtain a uniform, mixed solution. Then the silica precursor tetraethyl orthosilicate (17.5 mmol) and aluminum precursor aluminum tri-sec-butoxide (17.5 mmol) were added to the resulting mixture and the mixture stirred at a rapid speed for 2 hours. The resulting mixture was put in a Petri dish, and the ethanol was evaporated at room temperature at atmospheric pressure for 24 hours. Then, an aging process was performed on the resulting product at 65 degrees C in an air atmosphere for 12 hours and worked up to afford mesoporous oxide-catalyst.