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) rhenium in elemental form or in the form of a compound characterised in that the rhenium metal is present in the composition in amount in the range 0.0001 to 2.00 % w/w. The compositions show improved activity over a wide temperature range than prior art compositions.
Abstract:
Increased yields of middle distillate and jet fuel and increased catalyst activity are obtained in a hydrocracking process by the use of a catalyst containing a beta zeolite and a Y zeolite having a unit cell size from 24.37 to 24.44 angstrom. The catalyst has a relatively high amount of Y zeolite relative to beta zeolite.
Abstract:
A catalytic composition comprising a catalytically active metal and a solid support, characterized in that said catalytically active metal is included into the core structure of said solid support, and said solid support is a refractory and ionic conductive oxide, process for their preparation and its use as a catalyst in synthesis gas production.
Abstract:
Die Erfindung beschreibt die Herstellung eines Katalysators zum Einsatz in der Oxydation und selektiven Reduktion mit Eigenschaften, die der katalytischen Eigenschaft der Edelmetallkatalysatoren ähneln, durch die Bildung einer Kristalloberfläche auf Katalysatorträgern aus einem mehrstufig hergestellten Synthesekristall derElemente der Seltenen Erden und der Metallkomponenten Kobalt und/oder Lanthan.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Katalysators, der formal 0,1 bis 20 Massen-% Alkali- und/oder Erdalkalimetalloxid, 0,1 bis 99 Massen-% Aluminiumoxid und 0,1 bis 99 Massen-% Siliziumdioxid aufweist, welches dadurch gekennzeichnet ist, dass es die Schritte Behandeln eines Alumosilikats mit einer wässrigen Alkali- und/oder Erdalkalimetallsalzlösung unter sauren Bedingungen und Kalzinieren des mit wässriger Alkali- und/oder Erdalkalimetallsalzlösung behandelten Alumosilikats, aufweist sowie ein durch dieses Verfahren erhältlicher Katalysator der formal Alkalimetall- und/oder Erdalkalimetalloxid, Aluminiumoxid und Siliziumdioxid aufweist, welcher dadurch gekennzeichnet ist, dass der Katalysator formal einen Anteil an Alkalimetall- und/oder Erdalkalimetalloxiden von 0,5 bis 20 Massen-%, einen Anteil an Aluminiumoxid von 4 bis 30 Massen-%, und einen Anteil an Siliziumdioxid von 60 bis 95 Massen-% aufweist, und die Verwendung dieses Katalysators in einem Verfahren zur Herstellung von Isoolefinen mit 4 bis 6 Kohlenstoffatomen durch katalytische Gasphascnspaltung von tertiären Alkoholen oder Alkyl-tcrt.-alkylethern.
Abstract:
The invention concerns the selective oxidation of propane into acrylic acid using highly selective catalysts and relates more particularly to a process for preparing these improved catalysts and their use for the production of acrylic acid from propane. The improved catalysts having the formula: Mo1Va(Te and/or Sb)b(Nb and/or Ta)cSidOx wherein a is between 0.006 and 1, b is between 0.006 and 1, c is between 0.001 and 0.5, d is between 0 and 3.5, and x is dependant on the oxidation state of the other elements, are obtained by adding a doping agent constituted by at least one component selected from Nb and Ta to a mainly orthorhombic phase prepared by hydrothermal method of a Mo-V-(Te and/or Sb)-O mixed metal oxide, optionally containing Nb and/or Ta and/or Si.
Abstract:
The invention relates to petroleum, gas and coal chemistry, and concerns a catalyst for C 5 -C 100 hydrocarbons synthesis in particular from CO and H 2 and method for producing the said catalyst. The proposed catalyst for synthesizing C 5 -C 100 hydrocarbons comprises an aluminum oxide-based support which is obtainable from a gibbsite structure aluminum hydroxide and cobalt which content ranges from 15 to 50 mass %. Method of the catalyst making consists in preparing the support by mixing cobalt composition with aluminum hydroxide and in annealing said mixture, impregnating in two or more steps the aluminum oxide-based support with a cobalt salt aqueous solution and in thermally treating it, wherein the gibbsite structure aluminum hydroxide is used, the cobalt compositions and the hydroxide are mixed in a dry forms thereof and the molar cobalt-aluminum ratio ranges from 1:1 to 1:30.
Abstract:
The invention relates to a process for producing a polymer membrane, the polymer membrane being produced from a solution, in particular a casting solution, comprising at least one first polymer. The invention further relates to a polymer membrane. The process of the invention is distinguished by the fact that a water-soluble second poIymer and/or oligomer that forms phases in the solution is part of the solution. The polymer membrane of the invention, preferably produced by the process of the invention, has an oil flow rate, in particular of a refined edible oil, of greater than 200 l/m2h bar at 60°C.
Abstract:
Supported catalysts which allow shortening of the production steps for supported catalysts useful for production of lower aliphatic carboxylic acids from lower olefins and oxygen, and which compared to supported catalysts of the prior art, can inhibit generation of carbon dioxide (CO2) gas by-product during the production of lower aliphatic carboxylic acids. A compound containing at least one element selected from Group 8, 9 and 10 elements of the Periodic Table is loaded on a carrier and then, before reduction treatment of the compound, it is subjected to alkali treatment with an alkaline substance, and a compound containing at least one element selected from gallium, indium, thallium, germanium, tin, lead, phosphorus, arsenic, antimony, bismuth, sulfur, selenium, tellurium and polonium is loaded.
Abstract:
A method of preparing, preferably recycling, a catalyst support material is disclosed and is particularly applicable to recycling a titania support. The invention includes crushing the used catalyst support that is obtained by leaching catalytic components from a used supported catalyst and preferably combining it with new catalyst support in order to provide the required average particle size and ratio of crystal phases. The invention has a number of benefits including making use of used catalyst support materials which have been conventionally disposed of and also providing a method to more efficiently recycle the active component. Where the support is recycled for a similar application, less promoter may be required.