摘要:
L'invention concerne une composition catalytique, caractérisée en ce qu'elle est constituée d'une zéolithe de type ferriérite sous forme acide contenant du fer. L'invention a aussi pour objet un système de traitement des gaz comprenant une telle composition catalytique et un moteur équipé d'un tel système.
摘要:
A catalyst for use in the production of a lower aliphatic carboxylic acid ester by reacting a lower olefin and a lower aliphatic acid ester in a gas phase, which catalyst has been decreased in activity through use, is regenerated by heating to be recovered in activity. The regenerated catalyst is reused for the production of a lower aliphatic carboxylic acid ester.
摘要:
An alkaline-earth metal compound-containing zeolite catalyst composed of a composite material comprising at least a first component, a second component, and a third component, wherein the first component is composed of at least one of zeolites selected from a group consisting of proton-type zeolites and ammonium type zeolites, the second component is composed of at least one of alkaline-earth metal compounds, and the third component is composed of at least one selected from a group consisting of aluminum oxides, aluminum hydroxides, silicon oxides, silicon hydroxides, and clay minerals. The first component has a molar ratio of Si/A1 of 10 or more and 300 or less. Content of the second component relative to the first component defined is 0.3 mass % or more and less than 10 mass % as alkaline-earth metal. Content of the third component relative to the first component is 15 mass % or more and 200 mass % or less.
摘要:
Process for the preparation of olefins comprisingreacting an oxygenate and/or olefinic feed in a reactor in the presence of a molecular sieve catalyst to form a mixture which comprises olefins and at least partially coked catalyst; separating olefins and at least partially coked catalyst as obtained; recovering olefins obtained; passing the at least partially coked catalyst to a regenerator; introducing into the regenerator an oxygen-containing gas to regenerate at least part of the at least partially coked catalyst, thereby producing a gaseous mixture and at least partially regenerated catalyst; recovering part of the at least partially regenerated catalyst; analysing the at least partially regenerated catalyst to control the burning rate of the coke present on the at least partially coked catalyst in the regenerator by adjusting one or more conditions of the regeneration of the at least partially coked catalyst on the basis of the analysis of the at least partially regenerated catalyst; separating at least partially regenerated catalyst and at least part of the gaseous mixture; and passing at least part of the at least partially regenerated catalyst to the reactor.
摘要:
The invention relates to a method for removing carbonaceous deposits from surfaces of catalysts and plant components by treating the deposits with a superheated steam flow at least temporarily containing an oxygenated gas, wherein by monitoring the CO 2 in the exhaust gas after condensing the steam at a temperature of at least 300 °C, (a) the carbonaceous deposits are treated with super-heated steam at a temperature of at least 300 °C until the CO 2 content of the exhaust gas has exceeded a maximum, (b) then with further introduction of super-heated steam the introduction of oxygen begins, wherein the amount of introduced oxygen is adjusted so that the CO 2 -content in the exhaust further reduces until it has sunk to a value
摘要:
L'invention concerne un procédé de réactivation d'un catalyseur de fluoration à base de chrome, notamment d'oxyde de chrome, en mettant en contact le catalyseur de fluoration à base de chrome désactivé avec une atmosphère contenant de la vapeur d'eau à température élevée, de préférence au-dessus de 300 °C.
摘要:
Present invention relates to a novel process for upgrading a residual hydrocarbon oil feedstock having a significant amount of Conradson Carbon Residue (concarbon), metals, especially vanadium and nickel, asphaltenes, sulfur impurities and nitrogen to a lighter more valuable hydrocarbon products by reducing or minimizing coke formation and by injecting fine droplets of oil soluble organo-metallic compounds at multiple elevations of the riser with varying dosing rates.
摘要:
La présente invention concerne un régénérateur de catalyseur en lit mobile (1), comprenant une enceinte (2) s'étendant selon une direction verticale, ladite enceinte étant divisée en au moins deux zones de régénération s'étendant le long de la hauteur verticale de ladite enceinte dans lesquelles circulent de façon gravitaire des particules de catalyseur, dans lequel chaque zone de régénération comprend successivement et dans l'ordre de circulation des catalyseurs: a) une section de combustion (CO); b) une section d'oxychloration (O) disposée sous la section de combustion et comportant des moyens d'amenée du catalyseur de la section de combustion (CO) dans la section d'oxychloration (O); c) une section de calcination (CA) disposée sous la section d'oxychloration, caractérisé en ce que les zones de régénération sont séparées les unes des autres par un moyen de séparation étanche aux catalyseurs et aux gaz de sorte que les catalyseurs de chacune des zones soient aptes à être régénérés dans des conditions opératoires différentes.
摘要:
Catalyst that is used in the catalytic pyrolysis of biomass is regenerated by oxidation and washing with a liquid to remove minerals and restore catalyst activity and selectivity to aromatics.