Abstract:
A process for producing an olefin oxide which comprises reacting an olefin with oxygen in the presence of a catalyst comprising a copper oxide and a ruthenium oxide on a porous support.
Abstract:
The present invention relates to a process of catalytic partial oxidation with a catalytic system comprising at least two catalytic zones of which at least one zone exclusively contains one or more noble metals selected from the group consisting of Rhodium, Ruthenium, Iridium, Palladium and Platinum and at least another zone contains Nickel, said catalytic system characterized in that at least one zone exclusively containing noble metals selected from the group consisting of Rhodium, Ruthenium, Iridium, Palladium and Platinum is always distinct but in contact with at least one zone containing Nickel. One or more metals selected from the group consisting of Rhodium, Ruthenium, Iridium, Palladium and Platinum are possibly added to the catalytic zone or zones comprising Nickel.
Abstract:
The present invention is directed to a method of carrying out Suzuki-Miyaura CC-coupling reactions, comprising reacting an aryl halide with an aryl boronic acid in an organic solvent in the presence of a carbon supported palladium catalyst and a base, wherein said reactions are carried out at constant pH. The invention is also directed to a palladium on carbon catalyst suitable for catalyzing Suzuki-Miyaura CC-coupling reactions.
Abstract:
This invention relates to a process of preparing a catalyst from zeolite having a relatively high content of sodium of 18.6 mug Na2O per zeolite surface area, or greater. The invention comprises adding yttrium compound to the zeolite, either prior to, during, or after its combination with precursors for catalyst matrix. This invention is suitable for preparing zeolite containing fluid cracking catalysts.
Abstract:
A hydrocarbon conversion catalyst composition which comprises ZSM-48 and/or EU-2 zeolite particles and refractory oxide binder essentially free of alumina in which the average aluminium concentration of the ZSM-48 and/or EU-2 zeolite particles is at least 1.3 times the aluminium concentration at the surface of the particles, processes for preparing such catalyst compositions and processes for converting hydrocarbon feedstock with the help of such compositions.
Abstract:
Disclosed are a silicon-containing cerium composite oxide which is capable of maintaining a large specific surface area even used in a high temperatures environment, and which has excellent heat resistance and reducibility, as well as a method for producing the composite oxide and a catalyst for exhaust gas purification employing the composite oxide . The composite oxide contains 2 to 20 mass% silicon in terms of SiO 2 , has properties of exhibiting a specific surface area of not less than 40 m 2 /g as measured by the BET method after calcination at 1000 °C for 5 hours, and a reducibility of not lower than 30 % as calculated from measurement of temperature-programmed reduction from 50 °C to 900 °C after calcination at 1000 °C for 5 hours, and is suitable for a co-catalyst for a catalyst for exhaust gas purification.
Abstract:
A silica-based material comprising: silicon; aluminum; at least one fourth period element selected from the group consisting of iron, cobalt, nickel and zinc; and at least one basic element selected from the group consisting of alkali metal elements, alkali earth metal elements and rare earth elements, wherein the silica-based material comprises 42 to 90 mol% of the silicon, 3 to 38 mol% of the aluminum, 0.5 to 20 mol% of the fourth period element and 2 to 38 mol% of the basic element, based on a total mole of the silicon, the aluminum, the fourth period element and the basic element.
Abstract:
The present invention provides an ammonia oxidation/decomposition catalyst including a support composed of an oxidizable and reducible metal oxide and a catalytically active metal supported thereon. By bringing the ammonia oxidation/decomposition catalyst including a support composed of an oxidizable and reducible metal oxide and a catalytically active metal supported thereon into contact with ammonia and air at ordinary temperature, the support in a reduced state reacts with oxygen to generate oxidation heat, and the temperature of the catalyst layer is increased in a moment. Once the temperature of the catalyst layer is increased to a temperature at which ammonia and oxygen react with each other, the ammonia oxidation reaction proceeds autonomously after that. The heat generated in this exothermic reaction is used in the course of decomposing ammonia in the presence of the catalytically active metal, thereby producing hydrogen. According to this, the need for pre-heating by an electric heater or the like can be eliminated, and the production costs of hydrogen can be reduced.
Abstract:
The present invention relates to a catalyst comprising a substrate and a catalyst coating, the catalyst coating comprising two or more layers, said layers comprising: (a) a first layer provided on the substrate, said first layer comprising Pt and/or Pd; and (b) a second layer provided on the first layer, said second layer comprising Pt; the first and second layers each further comprising: one or more particulate support materials; one or more oxygen storage component (OSC) materials; and one or more nitrogen oxide storage materials comprising one or more elements selected from the group of alkali and/or alkaline earth metals, wherein the total amount of alkali and alkaline earth metals comprised in the one or more nitrogen oxide storage materials contained in the catalyst ranges from 0.18 to 2.5 g/in³ calculated as the respective alkali metal oxides M 2 O and alkaline earth metal oxides MO, as well as to a method for the production of a catalyst, and to a process for the treatment of a gas stream comprising nitrogen oxide, in particular of an exhaust gas stream resulting from an internal combustion engine.