Provided is a semiconductor photoelectrode which maintains a light energy conversion efficiency for a long time. In the semiconductor photoelectrode, using a conductive substrate including a III-V group compound semiconductor, a semiconductor thin film including a III-V group compound semiconductor having a photocatalytic function is disposed on the substrate, and an oxygen generation co-catalyst layer having an oxygen generation co-catalytic function for the semiconductor thin film is disposed on the semiconductor thin film. Between the semiconductor thin film and the oxygen generation co-catalyst layer, a semiconductor thin film including a III-V group compound semiconductor having a lattice constant smaller than that of the semiconductor thin film in a plane perpendicular to a crystal growth direction is disposed.

The invention provides a process for preparing a methane oxidation catalyst, a methane oxidation catalyst thus prepared and a method of oxidizing methane.

A process for preparing a selective hydrogenation catalyst comprising nickel, copper and a support comprising at least one refractory oxide, comprising the following steps: bringing the support into contact with a solution containing at least one copper precursor and one nickel precursor; drying the catalyst precursor at a temperature of less than 250° C.; reducing the catalyst precursor by bringing said precursor into contact with a reducing gas at a temperature of between 150° C. and 250° C.; bringing the catalyst precursor into contact with a solution comprising a nickel precursor; a step of drying the catalyst precursor at a temperature of less than 250° C.; reducing the catalyst precursor by bringing said precursor into contact with a reducing gas at a temperature of between 150° C. and 250° C.

The present invention provides a catalyst comprising at least one first metal selected from the group consisting of Groups 3 to 6 of the periodic table, wherein an amount of Bronsted acid sites of the catalyst is 1.8 μmol/g or less.

The present disclosure relates to methods for selectively hydrogenating acetylene, to methods for starting up a selective hydrogenation reactor, and to hydrogenation catalysts useful in such methods. In one aspect, the disclosure provides a method for selectively hydrogenating acetylene, the method comprising contacting a catalyst composition with a process gas. The catalyst composition comprises a porous support, palladium, and one or more ionic liquids. The process gas includes ethylene, present in the process gas in an amount of at least 20 mol. %; acetylene, present in the process gas in an amount of at least 1 ppm; and 0 to 190 ppm or at least 600 ppm carbon monoxide. At least 90% of the acetylene present in the process gas is hydrogenated, and the selective hydrogenation is conducted without thermal runaway.

A composite oxide including an oxide of a metal element L and an oxide of a metal element N, and represented by a composition of general formula L.sub.nN.sub.1-n, wherein the metal element L is a Group 1 element, a Group 2 element, or a Group 1 element and a Group 2 element, the metal element N comprises a Group 1 or Group 2 element other than the metal element L, n is 0.001 or more and 0.300 or less, the oxide of the metal element L and the oxide of the metal element N form no solid solution, and oxide particles of the metal element L are deposited on surfaces of oxide particles of the metal element N. Also, a metal-carrier material and an ammonia synthesis catalyst having, supported on this composite oxide, particles of at least one metal M selected from the group consisting of cobalt, iron, and nickel.

The present invention relates to a selective catalytic reduction (SCR) catalyst comprising a support, vanadium and antimony, a catalytic article comprising the SCR catalyst, and an exhaust treatment system for an internal combustion engine comprising the SCR catalyst. In one embodiment, the invention provides an SCR catalyst for reduction of 5 nitrogen oxides, comprising: a support, and an active material on the support; wherein the support, calculated as its oxide, is present in the SCR catalyst in an amount of 40 to 99% by weight, relative to the total weight of the SCR catalyst; the active material comprises vanadium and antimony; the vanadium, calculated as V.sub.2O.sub.5, is present in the SCR catalyst in an amount of 1 to 15% by weight, relative to the total weight of the SCR catalyst; the 10 antimony, calculated as Sb.sub.2O.sub.3, is present in the SCR catalyst in an amount of 0.5 to 20% by weight, relative to the total weight of the SCR catalyst; wherein the SCR catalyst, after hydrothermally aged at 550° C. for 100 hours with 10% water, has a 200-300° C. denitrification efficiency of at least 60%, with 60,000h.sup.−1 space velocity and an ammonia to NOx molar ratio of 1:11

To provide a platinum-loaded alumina catalyst with an improved catalyst life.

A platinum-loaded alumina catalyst includes an alumina carrier, and platinum loaded on the alumina carrier, wherein the alumina carrier includes a γ-alumina carrier having a surface area of 200 m.sup.2/g or more, a pore volume of 0.50 m.sup.2/g or more, an average pore diameter in a range of 60 to 150 Å, with pores having a pore diameter in a range of ±30 Å from the average pore diameter occupying 60% or more of a total pore volume, platinum particles are loaded on γ-alumina carrier in a range of 0.1 to 1.5% by weight calculated as elemental platinum (Pt), and 70% or more of the platinum particles have a size of 8 to 15 Å by direct observation using a transmission electron microscope.

Disclosed are a photocatalyst and application thereof in environmentally friendly photocatalytic treatment of a power battery. The photocatalyst is obtained by loading Ag—TaON on a hollow glass microsphere, wherein a mass ratio of the Ag—TaON to the hollow glass microsphere is 1:5 to 10. According to the invention, the Ag—TaON and the hollow glass microsphere are compounded, the hollow glass microsphere has better light permeability, which avoids mutual shielding between catalysts, such that the photocatalyst filled in a reactor is fully excited, which is capable of effectively improving a light utilization rate, thus improving the catalytic conversion efficiency of the photocatalyst.

A method comprising a) contacting a solvent, a carboxylic acid, and a peroxide-containing compound to form an acidic mixture wherein a weight ratio of solvent to carboxylic acid in the acidic mixture is from about 1:1 to about 100:1; b) contacting a titanium-containing compound and the acidic mixture to form a solubilized titanium mixture wherein an equivalent molar ratio of titanium-containing compound to carboxylic acid in the solubilized titanium mixture is from about 1:1 to about 1:4 and an equivalent molar ratio of titanium-containing compound to peroxide-containing compound in the solubilized titanium mixture is from about 1:1 to about 1:20; and c) contacting a chromium-silica support comprising from about 0.1 wt. % to about 20 wt. % water and the solubilized titanium mixture to form an addition product and drying the addition product by heating to a temperature in a range of from about 50° C. to about 150° C. and maintaining the temperature in the range of from about 50° C. to about 150° C. for a time period of from about 30 minutes to about 6 hours to form a pre-catalyst.