The present disclosure relates to a method for preparing a metal catalyst deposited with a layer film by ALD process and a metal catalyst thereof. More specifically, the present disclosure is intended to inhibit sintering of catalyst particles to prevent activity decrease, thus stably maintaining high activity, and simultaneously, providing heat stability, by layer-by-layer deposition of a layer film with alternation of different inorganic films on the surface of a metal catalyst in an ALD process.

Titania is a semiconductor and photocatalyst that is also chemically inert. With its bandgap of 3.2 and greater, to activate the photocatalytic property of titania requires light of about 390 nm wavelength, which is in the ultra-violet, where sunlight is very low in intensity. A method and devices are disclosed wherein stress is induced and managed in a thin film of titania in order to shift and lower the bandgap energy into the longer wavelengths that are more abundant in sunlight. Applications of this stress-induced bandgap-shifted titania photocatalytic surface include photoelectrolysis for production of hydrogen gas from water, photovoltaics for production of electricity, and photocatalysis for detoxification and disinfection.

A method for preparing copper-solver and copper-gold porous microsheets with specific pore sizes, the method including the steps of providing a solution of copper microsheets and adding a silver or gold solution under controlled temperature, the reaction conditions can be changed to determine pore sizes.

Methods of producing metal catalysts can include mixing two or more metal salts and an aluminum salt in water to produce a metal catalyst precursor solution; mixing the metal catalyst precursor solution and an alkali metal buffer solution to produce a precipitate; ion exchanging the alkali metal in the precipitate for a non-alkali cation to produce a low-alkali metal precipitate comprising 3 wt % or less alkali metal by weight of the precipitate on a dry basis; producing a powder from the low-alkali metal precipitate; and calcining the powder to produce a metal catalyst. Such metal catalysts may be useful in producing bifunctional catalyst systems that are useful in, among other things, converting syngas to dimethyl ether in a single reactor

The process for obtaining M.sup.1-BH.sub.4, the process comprising contacting M.sup.1-BO.sub.2 with a metal M.sup.2 in the presence of molecular hydrogen (H.sub.2) under conditions permitting the formation of M.sup.1-BH.sub.4 and M.sup.2-oxide, wherein the M.sup.1 is a metal selected from column I of the periodic table of elements or alloys of metals selected from column I of the periodic table of elements and M.sup.2 is a metal or an alloy of metals selected from column II of the periodic table of elements, provided that M.sup.2 is not Mg and M.sup.1 is different from M.sup.2.

A moisture and hydrogen adsorption getter is provided. The moisture and hydrogen adsorption getter includes a silicon substrate including a concave portion and a convex portion, a silicon oxide layer conformally provided along a surface of the concave portion and a surface of the convex portion and configured to adsorb moisture, and a hydrogen adsorption pattern disposed on the silicon oxide layer. A portion of the silicon oxide layer is exposed between portions of the hydrogen adsorption pattern.

The method allows to produce catalysts with nanoparticles of platinum and its alloys with metals of a given composition, with high values of catalytic activity in an oxygen electroreduction reaction, and with predetermined values of structural characteristics. The method comprises preparation of a solution of chloroplatinic acid or a mixture of chloroplatinic acid with metal salts, mixing thereof with dispersed carbon or non-carbon carriers, their mixtures and compositions with specific surface area of more than 60 m.sup.2/g, dispersion of the obtained mixture, chemical reduction of compounds of platinum and a metal salt with subsequent deposition of nanoparticles of metallic platinum or its alloys on a dispersed carrier being carried out by purging gases selected from: nitrogen oxides (N.sub.2O, NO, NO.sub.2), carbon oxides (CO, CO.sub.2), sulfur oxide (SO.sub.2), ammonia (NH.sub.3) or their mixtures through the solution at a temperature of the solution in the range from 5 to 98 C.

The present invention provides a method for preparing a transparent free-standing titanium dioxide nanotube array film. In the method, with the titanium foil as a substrate, the titanium dioxide nanotube array film is obtained by anode oxidation on the surface of the titanium foil. Upon high temperature annealing, the titanium dioxide nanotube array film naturally falls off to obtain the transparent free-standing titanium dioxide nanotube array film. The method according to the present invention features simple operations, saves time and cost. With the method, a completely strippable titanium dioxide nanotube array film may be prepared, and in addition, morphology of the titanium dioxide nanotube is not damaged. The free-standing and complete titanium dioxide nanotube array film facilitates transfer and post-treatment, has the feature of transparency and may be in favor of the applications to the studies such as photocatalysis and the like.

A metal porous body having a three-dimensional network structure, includes: a framework forming the three-dimensional network structure; and a coating layer having fine pores and coating the framework, the three-dimensional network structure including a rib and a node connecting a plurality of ribs, the framework including an alkali-resistant first metal, the fine pores having an average fine pore diameter of 10 nm or more and 1 m or less, the coating layer including an alkali-resistant second metal and optionally including an alkali-soluble metal, the alkali-soluble metal being contained at a proportion of 0% by mass or more and 30% by mass or less with reference to a total mass of the framework and the coating layer.

A hydrocracking catalyst for petroleum hydrocracking is provided, the hydrocracking catalyst provided in a form of at least one fiber, and the at least one fiber comprising at least one zeolite and at least one metal oxide. Methods are also provided to form the hydrocracking catalyst in the form of at least one fiber, particularly electrospinning.