A novel coated catalyst having an outer shell which is composed of a catalyst material having high surface area and contains molybdenum, vanadium, tellurium and niobium, and the use of this catalyst for the oxidative dehydrogenation of ethane to ethene or the oxidation of propane to acrylic acid and also a process for producing the catalyst is disclosed.

Photoreduction of graphene oxide, by UV-generated ketyl radicals, to graphene. The photoreduction is versatile and can be carried out in solution, solid-state, and even in polymer composites. Reduction of graphene oxide can take place in various polymer matrixes. Methods for producing graphene-supported metal nanoparticles by photoreduction. Graphene oxide and a metal nanoparticle precursor are simultaneously reduced by the action of photogenerated ketyl radicals. Photoreduction is performed on polymer composite films in one embodiment.

Provided is a fabrication method of a photocatalytic material in which a single layer of a carbon-based participate is formed on a surface of each of titanium dioxide particle. The method includes (a) loading titanium dioxide particles into an electric furnace comprising a mechanism for rotating a core tube; (b) heating an inside of the core tube of the electric furnace into which the titanium dioxide particles have been loaded to a temperature of not less than 400 C. and not more than 800 C., while an inert gas is introduced into the inside of the core tube; (c) supplying a hydrocarbon gas to the inside of the core tube in addition to the inert gas; and (d) performing a thermal CVD on each of the titanium dioxide particles in a fluidized state inside the core tube, while the core tube is rotated, to form a single layer of a carbon-based precipitate containing graphene on a surface of each of the titanium dioxide particles. A photocatalyst material is provided.

The present invention discloses a preparation method of an alumina supported cerium oxide powder material. A cerium organometallic precursor is effectively decomposed into CeO.sub.2 nanoparticles at 500-700 C. in an oxygen atmosphere condition by using a chemical vapor deposition method, and the CeO.sub.2 nanoparticles are evenly dispersed on an Al.sub.2O.sub.3 support. The decomposition of the CeO.sub.2 precursor is accelerated by changing experimental parameters of reaction between organic materials and oxygen, so as to control the size and microstructure of powder, thereby achieving the preparation and even dispersion of cerium oxide nanoparticles, and avoiding the problem of generation of toxic waste liquor during reaction. The method of the present invention is simple, has a short preparation period, and the cerium oxide nanoparticles prepared are evenly dispersed, can be used as catalytic materials and functional materials, and have a broad application prospect in multiple fields.

An object of the present invention is to provide a method for regenerating a catalyst for butadiene production, for removing a coke-like substance which is generated by oxidative dehydrogenation of n-butene in the presence of a catalyst for butadiene production and which is attached to the catalyst and the inside of a reactor. After the catalyst is used in oxidative dehydrogenation of butenes, the catalyst regeneration method of the present invention removes a coke-like substance in a reactor which is charged with the catalyst for butadiene production, the catalyst having a prescribed composition before being used in the oxidative dehydrogenation.

A preparation method of an alumina-carbon nano tube composite powder material includes the steps of using an organometallic precursor as a raw material, using metal nanoparticles formed on the surface of the alumina powder as a catalyst, and simultaneously feeding a carbonaceous gas such as methane and acetylene, so as to grow a carbon nano tube in situ, and obtain an alumina-metal nanoparticle-carbon nano tube composite powder material through a chemical vapor deposition method under a temperature condition of 400 to 800 C. Through changing various parameters such as the weight of the organic raw material, the flow or constituent of reactant gases and reaction temperature, the decomposition of the organic raw material and the generation of the metal nanoparticles and the carbon nano tube are adjusted, and the size and the microstructure of the powder are controlled.

The present invention relates to a composite material including a porous titania thin film and a preparation method therefor. A composite material according to the present invention allows for a simple thin film formation process because of the use of cellulose crystals, makes it easy to control the structure of the titanium dioxide thin film provided therefor, has a large specific area, and is superior in terms of scratch resistance and photoactivity, thus finding useful applications in the various fields utilizing titanium dioxide as a photocatalyst.

The present invention relates to a photocatalyst nanomaterial comprising a solid substrate and a metal oxide/oxyhydroxide arranged on the solid substrate forming a coating having a thickness comprised between 1 nm and 1 micrometer and having an amorphous structure. The invention also relates to a nanometric coating which comprises the described photocatalyst material and metallic nanoparticles, as well as to the method for obtaining the catalyst material, to the use of the catalyst material as a photocatalyst in the ultrafast synthesis of metallic nanoparticles, and to the use of the nanometric coating in the manufacture of optical sensors, biocidal coatings and elimination of reactive oxygen species.

The purpose of the present invention is to provide a catalyst support with which it is possible to produce a high-quality fibrous carbon nanostructure. The purpose of the present invention is to provide a catalyst support used when producing a fibrous carbon nanostructure, the catalyst support comprising a carrier and a catalyst layer formed on the carrier, the catalyst layer including a metal-containing compound, and the difference ?YI in yellowness expressed by the formula being 3-20, where YI.sub.A is the yellowness of the carrier, and YI.sub.B is the yellowness of the catalyst support. ?YI=YI.sub.B?YI.sub.A

Provided are a catalyst that suppresses production of a coke-like material and improves the long-term stability of the reaction, and a method for producing the catalyst. A composite metal oxide catalyst for conjugated diolefin production is used for producing a conjugated diolefin from a mixed gas including a monoolefin having 4 or more carbon atoms and molecular oxygen by a catalytic oxidative dehydrogenation reaction, the catalyst having a relative intensity ratio of X-ray diffraction peaks represented by the following Formula (A):

0.9<Pr<3.0

Pr=Pi1/Pi2(A) (in the formula, Pi1 represents the maximum peak height at a 2 value in the range of 26.40.3 in the X-ray diffraction peaks; Pi2 represents the maximum peak height at a 2 value in the range of 28.50.3 in the X-ray diffraction peaks; and Pr represents the relative intensity ratio of Pi1 with respect to Pi2).