Abstract:
Catalyst for use in the high temperature shift reaction comprising in its active form a mixture of zinc alumina spinel and zinc oxide in combination with an alkali metal selected from the group consisting of Na, K, Rb, Cs and mixtures thereof.
Abstract:
The invention relates to processes for producing supported gold catalysts on carbon supports, wherein the support is brought into contact with aqueous solution or suspension of a chlorogold acid precursor. The invention also relates to a carbon-supported gold catalyst and its use for the oxidation of alcohols, aldehydes, polyhydroxy compounds and carbohydrates.
Abstract:
Es wird ein Abgasreinigungssystem (Verfahren und Vorrichtung) zur Behandlung von Stickoxide und Kohlenwasserstoffe enthaltenden Dieselabgasen offenbart, das die Zugabe von Ammoniak oder einer zu Ammoniak zersetzlichen Verbindung in den Abgasstrom und die anschließende Überleitung des Abgasstroms über zwei nacheinander angeordnete SCR-Katalysatoren mit unterschiedlichen Eigenschaften und Zusammensetzungen umfaßt. Beide SCR-Katalysatoren sind frei von Vanadiumverbindungen und nur der abströmseitig angeordnete SCR-Katalysator enthält Zeolithverbindungen. Das erfindungsgemäße Abgasreinigungssystem zeichnet sich durch ein gutes Anspringverhalten bei tiefen Temperaturen und eine gleichzeitig hohe Konversionsleistung über einen breiten Temperaturbereich aus.
Abstract:
A composition for use as a catalyst or catalyst precursor for the conversion of synthesis gas to hydrocarbons said composition comprises (i) cobalt either as the elemental metal, oxide or a compound thermally decomposable to the elemental metal or oxide and (ii) zinc in the form of the oxide or a compound thermally decomposable to the oxide and (iii) platinum in elemental form or in the form of a compound characterised in that the platinum metal is present in the composition in amount in the range 0.0001 to 1.50 % w/w. The compositions show improved activity over a wide temperature range than prior art compositions and also exhibit improved methane selectivity.
Abstract:
To provide an oxidation catalyst capable of burning PM of diesel engine exhausts gas at a low temperature, and hardly subjected to poisoning due to sulfur oxide. A composite oxide contains Ce, Bi, and M (wherein M is one or more elements selected from Mg, Ca, Sr, and Ba) and oxygen, and is manufactured, with a molar ratio of Ce, Bi, M expressed by Ce:Bi:M = (1 - x - y):x:y, satisfying 0
Abstract:
The invention covers a process for obtaining an alkaline earth or rare earth metal-P-modified molecular sieve (M-P-modified molecular sieve) comprising the following steps: a). selecting a molecular sieve selected from one of: - a P-modified molecular sieve which contains at least 0.3 wt% of P - a molecular sieve which is modified with P prior to or during step b) thereby introducing at least 0.3 wt % of P
b). contacting said molecular sieve with an alkaline earth or rare earth metal-containing compound (M-containing compound) to introduce at least 0.05 wt% of the alkaline earth or rare earth metal to the molecular sieve. The invention also covers a catalyst composite comprising: a). at least 10 wt % of a M-P-modified molecular sieve comprising at least 0.05 % by weight of an alkaline earth or rare earth metal (M) and at least 0.3 wt% of P, b). optionally metal phosphate, c). optionally matrix material, and d). optionally binder. The catalyst of the invention can also be used in a process for making an olefin product from an oxygen-containing, halogenide-containing or sulphur-containing organic feedstock wherein said oxygen-containing, halogenide-containing or sulphur-containing organic feedstock is contacted in the XTO reactor with the catalyst composite according to the invention under conditions effective to convert the oxygen-containing, halogenide-containing or sulphur-containing organic feedstock to olefin products (the XTO reactor effluent). The catalyst composite of the invention can also be used in addition or alternatively in an OCP process.
Abstract:
A process for the conversion of propane to propene is disclosed wherein a silica chromium catalyst composition is contacted with a propane feed stream and a carbon dioxide. The silica chromium catalyst composition is further disclosed wherein the composition, optionally, includes a promoter component.
Abstract:
Disclosed is a method for economically forming a uniform titanium oxide film on the surface of a base. Specifically, an aqueous titanium tetrachloride solution having a Ti content of 0.1-17% by weight is applied over the surface of a heat-resistant base in a film form. The aqueous titanium tetrachloride solution in the liquid film form is then heated to a temperature not less than 300˚C, thereby volatilizing H2O and HCl in the liquid film and forming a titanium oxide film. In case where the base is composed of a material such as aluminum that is poor in acid resistance, an acid-resistant coating film such as an oxide film is formed in advance on the surface of the metal base.
Abstract:
The present invention relates to a process of impregnating a porous body (14) by a suspension (12) containing at least one part of particles, said body comprising many channels (16) bound by porous walls (22) extending from one (18) of the faces to the other (20) faces of said body, a part of said channels being blocked against one of the faces and the other part of the channels being blocked against the other face. According to the invention, the method consists in: - making a suspension whose particle size distribution has Dv90/Dpores ratio of less than 0.25 and whose viscosity is such that said suspension is brought inside the walls by putting a portion of the particles on the surface of the pores of the walls; - placing one (18, 20) of the faces of the body (14) in communication with an area (30) containing the suspension; - adding the suspension to the body; - exerting a force on the suspension added so that said suspension crosses the walls - make a liquid pass through the walls.