Abstract:
A layered catalyst composite for controlling vehicular exhaust emissions is disclosed. The composite comprises a substrate such as cordierite, at least one bottom layer deposited on the substrate containing a precious metal component such as platinum and at least one NOx storage component present in the amount of about 0.3 to about 1.5 g/in3, and at least one top layer deposited on the bottom layer containing a precious metal component such as platinum and at least one NOx storage component present in the amount of about 0.0 to less than about 0.3 g/in3.
Abstract translation:公开了一种用于控制车辆废气排放物的层状催化剂复合材料。 复合材料包括诸如堇青石的基底,沉积在基底上的至少一个底层含有贵金属组分如铂和至少一种以约0.3至约1.5g / in 3的量存在的NOx储存组分, 并且沉积在底层上的含有贵金属组分如铂的至少一层顶层和至少一种以约0.0至小于约0.3g / in 3的量存在的NOx储存组分。
Abstract:
The present invention relates to porous layers, to a method for the production thereof and to the use of those layers in micro-electronics, in sensors, in catalytic reactions, in separation methods and in optical layers. The layers according to the invention are produced by application of a suspension of porous particles to a substrate by means of spin-coating.
Abstract:
A metal catalyst and a method of preparing the metal catalyst are disclosed. The metal catalyst consists essentially of a transition or noble metal supported by a ceria coating disposed on a ceramic monolith. Alternatively, a matrix structure can be provided on the ceramic monolith prior to the formation of the ceria coating. The use of the metal catalyst allows partial oxidation of hydrocarbons to be carried out at low initiation temperatures with high product yields and selectivities.
Abstract:
An gas generator is disclosed that generates gas from a pressure-producing reaction of reactant pieces and reactant fluid. The generator includes a pressure/reaction regulator for use with a reaction chamber. The regulator includes a reactant-fluid accumulator in communication with the reaction chamber via a reactant-fluid port for adjusting pressure in the chamber relative to a preselected threshold pressure. The regulator also includes at least one body extending substantially into the reaction chamber from the reactant-fluid port. The body is formed with holes for letting fluid under pressure into and out of the chamber. Also disclosed is such a regulator that is usable with a reaction chamber having plural reactant-fluid ports and includes plural bodies, one for each port. Certain bodies each have an associated check valve for allowing fluid into the reaction chamber, and certain other bodies each have an associated check valve with a counterweight for allowing fluid to exit the reaction chamber if pressure rises by a preselected increment above the preselected threshold pressure. The gas generator also includes a first and second condenser, with the latter being connected downstream of the former via a gas-exit port. The second condenser includes a spinner rotatably mounted in it for moving heavy, contaminant gases away from the gas-exit outlet under reaction pressure.
Abstract:
Supported coprecipitated cobalt-silica hydrogenation catalysts are disclosed. The catalysts are prepared by: preparing an aqueous reaction mixture containing cobalt cations, silicate anions and solid porous carrier particles under agitation to form a coprecipitate of the cobalt and silicate ions onto said solid porous support particles; heating the aqueous reaction mixture; and adding an alkaline precipitating agent to further precipitate the cobalt and silicate ions onto said solid porous carrier particles. The aqueous reaction mixture may additionally include copper cations.
Abstract:
There is provided a process for the production of ketones and a catalyst for increasing the proportion of ketone produced by the process, wherein an olefine, molecular oxygen and steam are passed over a catalyst containing discrete particles of tin oxide, a majority of such particles being of a size of at most 50 A, homogeneously distributed over a particulate supporting material, the tin oxide particles being covered by a substantially monomolecular layer of molybdenum oxide.
Abstract:
A CONTINUOUS PROCESS FOR THE PURIFICATION OF LIGHT PARAFFINIC FRACTION BOILING IN THE RANGE OF 25* TO 100*C. AND CONTAINING AS MAJOR PORTION STRAIGHT CHAIN PARAFFINS, BRANCHED PARAFFINS AND CYCLOPARAFFINS AND AS A MINOR PORTION AN IMPURITY SELECTED FROM THE GROUP CONSISTING OF AROMATIC HYDROCARBONS, SULPHUR-CONTAINING COMPOUNDS, NITROGEN-CONTAINING COMPOUNDS, AND OTHER NON--HYDROCARBON IMPURITIES, AND MIXTURES THEREOF, THE SULPHUR CONTENT BEING NO GREATER 500 P.P.M., SAID PROCESS COMPRISING: HYDROGENATION SAID LIGHT PARAFFINIC FRACTION AT A TEMPERATURE IN THE RANGE OF 150 TO 375*C., UNDER A PARTIAL PRESSURE OF HYDROGEN OF 10 TO 100 KG./CM.2, AT A S VELOCITY OF 0.5 TO 20 V./V./H. AND A HYDROGEN TO HYDROCARBON RATIO OF 100 TO 3,000 NM.3/M.3, IN THE PRESENCE OF A HYDROGENATING CATALYST CONTAINING BETWEEN 0.1 AND 2% OF PLATINUM ON A SILICA-ALUMINA CARRIER, SILICA BEING IN MAJOR QUANTITY, AND AT LEAST 30% OF THE PLATINUM BEING DISTRIBUTED ON THE CATALYST SURFACE WHICH IS ACCESSIBLE TO THE REACTANTS, FRACTIONATING THE PRODUCTS OF THE HYDROGENATION TO SEPARATE THE HYDROGENATED SULPHUR- AND NITROGEN-CONTAINING COMPOUNDS AND TO RECOVER A PARAFFINIC FRACTION SUBSTANTIALLY CONTAINING ONLY PARAFFINIC HYDROCARBONS WITH AN INCREASED CONTENT OF CYCLOPARAFFINS.
Abstract:
AN OLEFIN IS CONVERTED TO ONE OR MORE DIFFERENT OLEFINS BY CONTACT WITH A CATALYST COMPRISING SILICA AND RUTHENIUM OR A COMPOUND OF RUTHENIUM.
Abstract:
CATALYTIC REDUCTION OF ARALKYL KETONES TO ARALKYL ALCOHOLS WITH MINIMUM HYDROGENOLYSIS AND MINIMUM RING REDUCTION IS EFFECTED BY HYDROGENATION OF ARALKYL KETONES IN THE PRESENCE OF AN OSMIUM CATALYST.