54 results about "Γ alumina" patented technology

A hydrogenation catalyst is used for the catalytic hydrogenation of an ester-containing aldehyde mixture and the catalyst contains a γ-alumina having a BET surface area of from 70 to 350 m2 / g as support material, and at least one component having hydrogenation activity and being selected from the group consisting of nickel, cobalt and mixtures thereof.

An exhaust gas purification system that is equipped, from an upstream side toward downstream side through which an exhaust gas flows, with a plasma reactor and a NOx selective reduction catalyst unit having a NOx selective reduction catalyst layer acting on the exhaust gas, and which system provides a reducing agent adding means adding a reducing agent to the exhaust gas at an upstream side of the plasma reactor, wherein the NOx selective reduction catalyst layer comprises nickel and a NOx selective reduction catalyst or wherein the NOx selective reduction catalyst layer contains γ-alumina that supports magnesium or wherein the NOx selective reduction catalyst unit comprises a first purification unit where an exhaust gas via the plasma reactor is introduced, and a second purification unit where an exhaust gas via the first purification unit is introduced.

An apparatus for treatment of a waste gas, containing fluorine-containing compounds, comprises: a solids treating device for separating solids from the waste gas; an addition device for adding H2 and / or H2O, or H2 and / or H2O and O2, as a decomposition assist gas to the waste gas leaving the solids treating device; a thermal decomposition device that is packed with γ-alumina heated at 600-900° C., and which thermally decomposes the waste gas to which the decomposition assist gas has been added; an acidic gas treating device for removing acidic gases from the thermally decomposed waste gas; and channels or lines for connecting these devices in sequence. The apparatus preferably includes an air ejector which is capable of adjusting an internal pressure of the apparatus.

A member with alumina-based hard coating formed there-on wherein said hard coating contains nitrogen and has a composition represented by the formula (1) below:Al1-xMx(O1-yNy)z  (1)(0≦x≦0.5, 0<y≦0.5, z>0)where, M denotes at least one species of elements selected from those belonging to Group 4, Group 5, and Group 6 (excluding Cr), and such elements as Y, Mg, Si, and B.The hard coating based on γ-alumina, which is formed at temperatures no higher than 1000° C., is superior in wear resistance and heat resistance.

A hydrodesulfurization catalyst is produced by pre-sulfurizing a hydrodesulfurization catalyst Y including a support containing silica, alumina and titania and at least one metal component supported thereon and selected from VIA and VIII groups of the periodic table (comprising at least Mo), in which the total area of the diffraction peak area indicating the crystal structure of anatase titania (101) planes and the diffraction peak area indicating the crystal structure of rutile titania (110) planes in the support, measured by X-ray diffraction analysis being ¼ or less of the alumina diffraction peak area assigned to γ-alumina (400) planes. The molybdenum is formed into molybdenum disulfide crystal disposed in layers on the support by the pre-sulfurization, and having an average length of longer than 3.5 nm and 7 nm or shorter in the plane direction and an average number of laminated layers of more than 1.0 and 1.9 or fewer.

Disclosed is an organic photoreceptor, which is composed of a photosensitive layer and a protective layer, provided on an electric conductive support, and the protective layer contains a composition obtained by hardening reaction of γ-alumina particles treated with a compound having a reactive functional group with a hardenable compound. A manufacturing method thereof is also disclosed.

The invention discloses a preparation method of flaky nanometer gamma-aluminum oxide. The preparation method includes the steps that 1, inorganic aluminum salt and urea are dissolved in water to obtain a transparent solution, and the solution is transferred into a high-pressure reaction kettle; 2, hydrogen is injected into the high-pressure reaction kettle, and certain pressure and temperature are kept for a reaction; 3, after the reaction is ended, reaction materials are subjected to filtering, washing and drying to obtain a boehmite precursor, and the flaky nanometer gamma-aluminum oxide is obtained after calcining. The method has no neutralizing, ageing and other complex steps, and has the advantages of be simple in technology and having a few reaction steps. The gamma-aluminum oxide powder with a large specific surface area and the uniform flaky structure can be obtained, and is suitable for synthesis of a nanometer gamma-aluminum oxide carrier, for a metal supported catalyst, with a large specific surface area.