摘要:
Die vorliegende Erfindung betrifft einen Katalysator, der mindestens ein Oxid des Vanadiums, mindestens ein Oxid des Wolframs, mindestens ein Oxid des Cers, mindestens ein Oxid des Titans und mindestens ein Oxid des Niobiums enthält, sowie ein diesen enthaltendes Abgassystem.
摘要:
La présente invention concerne un procédé de fluoration d'un composé chloré comprenant les étapes de (a) mise en contact, dans un réacteur, dudit composé chloré avec du fluorure d'hydrogène en phase gazeuse en présence d'un catalyseur de fluoration pour produire un composé fluoré, et (b) régénération du catalyseur de fluoration utilisé à l'étape a), l'étape de régénération du catalyseur de fluoration comprenant (c) le traitement dudit catalyseur de fluoration avec un oxydant pour former un catalyseur de fluoration oxydé, et (d) le traitement du catalyseur de fluoration oxydé obtenu à l'étape (c) avec un mélange gazeux comprenant un agent réducteur.
摘要:
Die vorliegende Erfindung betrifft neuartige Katalysatoren für die oxidative Veresterung, mittels derer beispielsweise (Meth)acrolein zu Methyl(meth)acrylat umgesetzt werden kann. Die erfindungsgemäßen Katalysatoren zeichnen sich dabei insbesondere durch eine hohe mechanische und chemische Stabilität auch über sehr lange Zeiträume aus. Dies betrifft insbesondere eine Verbesserung der Katalysatorstandzeit, der Aktivität und der Selektivität gegenüber Katalysatoren des Standes der Technik, die in Medien mit auch geringem Wassergehalt im kontinuierlichen Betrieb relativ schnell Aktivität und/oder Selektivität verlieren.
摘要:
A process for preparing a catalyst comprising (A) selecting a catalyst support selected from the group consisting of gels of silica, silica alumina, alumina, aluminum phosphate, aluminaphospate, and combinations of two or more thereof; (B) mixing the catalyst support with one or more chromium containing compound, wherein the chromium containing compound is selected from the group consisting of chromium containing compounds which are oxidizable to a Cr +6 state and chromium containing compounds wherein the chromium is in a Cr +6 state; (C) mixing the catalyst support with one or more transition metal catalyst component; (D) calcining the catalyst support; and (E) optionally for the chromium containing compound which is oxidizable to a Cr +6 state, converting the chromium in the chromium containing compound to Cr +6 ; and (F) spray drying the catalyst support to form catalyst particles; wherein steps (B) - (F) may occur separately in any order or wherein any one or more of steps (B) - (F) may be combined together; and wherein the catalyst support gels are characterized by a surface area greater than 50 m 2 /gram and a pore volume greater than 0.5 cc/gram at the time of mixing the catalyst support gels with the chromium containing compound is provided.
摘要:
The present invention provides a process for preparing 2,3,3,3-tetrafluoropropene from 1,1,1,2,3- pentachloropropane and/or 1,1,2,2,3-pentachloropropane, comprising the following steps: (a) catalytic reaction of 1,1,1,2,3- pentachloropropane and/or 1,1,2,2,3-pentachloropropane with HF into a reaction mixture comprising HC1, 2-chloro-3,3,3- trifluoropropene, 2,3,3,3-tetrafluoropropene, unreacted HF, and optionally 1,1,1,2,2-pentafluoropropane; (b) separating the reaction mixture into a first stream comprising HC1 and 2,3,3,3-tetrafluoropropene and a second stream comprising HF, 2-chloro-3,3,3- trifluoropropene and optionally 1,1,1,2,2- pentafluoropropane; (c) catalytic reaction of the second stream into a reaction mixture comprising 2,3,3,3-tetrafluoropropene, HC1, unreacted 2-chloro-3,3,3-trifluoropropene, unreacted HF and optionally 1,1,1,2,2-pentafluoropropane and (d) feeding the reaction mixture of step (c) directly without separation to step (a).
摘要:
A process for the preparation of a catalyst useful for the vapor phase production of ethylene oxide from ethylene and oxygen comprising the steps of providing a catalyst precursor comprising an inert support having a catalytically effective amount of a silver containing compound, a promoting amount of an alkali metal containing compound, and a promoting amount of a transition metal containing compound disposed thereon; and heating the catalyst precursor in a gas atmosphere for a first period of time and a second period of time, wherein for the first period of time the gas atmosphere is an inert gas atmosphere and the temperature range is from about 25°C to about 600°C, and then in a second period of time the gas atmosphere is an oxygen-containing atmosphere and the second period temperature range is from about 350°C to about 600°C.
摘要:
The invention is for a method for making a heteropoly acid compound catalyst from compounds containing molybdenum, vanadium, phosphorus, cesium, copper, bismuth, antimony and boron in which molybdenum, vanadium, phosphorus, cesium, copper, bismuth and boron are at their highest oxidation states and antimony has a 3+ oxidation state. The catalyst contains oxides of molybdenum, vanadium, phosphorus, cesium, copper, bismuth, antimony, boron and, optionally, other metals. The catalyst has the formula: Mo 12 V a P b Cs c Cu d Bi e Sb f B g O x where Mo is molybdenum, V is vanadium, P is phosphorus, Cs is cesium, Cu is copper, Bi is bismuth, Sb is antimony, B is boron, O is oxygen, a is 0,01 to 5.0, b is 0.5 to 3.5, c is 0.01 to 2.0, d is 0.0-1.5, e is 0.0-2.0, f is 0.01-3.0, g is 0.0-4.0 and x satisfies the valences. Molybdenum is reduced by antimony and reoxidized during catalyst synthesis.