Abstract:
A process for the post-treatment of a zeolitic material having a BEA framework structure, the process comprising (i) providing a zeolitic material having a BEA framework structure, wherein the framework structure of the zeolitic material comprises X203 and Y02, wherein Y is a tetravalent element and X is a trivalent element and wherein the molar ratio X203 : Y02 is greater than 0.02 : 1; (ii) treating the zeolitic material provided in (i) with a liquid solvent system thereby obtaining a zeolitic material having a molar ratio X203 : Y02 of at most 0.02 : 1, and at least partially separating the zeolitic material from the liquid solvent system; (iii) treating the zeolitic material obtained from (ii) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75 ?C.
Abstract:
A process for the post-treatment of a zeolitic material having an MWW framework structure, the process comprising (i) providing a zeolitic material having an MWW framework structure, wherein the framework structure of the zeolitic material comprises X2O3 and YO2, wherein Y is a tetravalent element and X is a trivalent element and wherein the molar ratio X2O3:YO2 is greater than 0.02:1; (ii) treating the zeolitic material provided in (i) with a liquid solvent system thereby obtaining a zeolitic material having a molar ratio X2O3:YO2 of at most 0.02:1, and at least partially separating the zeolitic material from the liquid solvent system; (iii) treating the zeolitic material obtained from (ii) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75° C.
Abstract:
A layered diesel oxidation catalyst (DOC) comprises: a) a carrier substrate; b) a diesel oxidation catalytic material comprising bl)a first layer located on the carrier substrate the first layer comprising palladium impregnated on a support material comprising ceria in an amount of at least 45 weight% based on the total weight of the support material and optionally comprising platinum; b2) a second layer located on the first layer the second layer comprising palladium and platinum each impregnated on a support material comprising a metal oxide; wherein the platinum to palladium weight ratio of the first layer is lower than the platinum to palladium weight ratio of the second layer.
Abstract:
A process for the post-treatment of a zeolitic material having an MWW framework structure, the process comprising (i) providing a zeolitic material having an MWW framework structure, wherein the framework structure of the zeolitic material comprises X2O3 and YO2, wherein Y is a tetravalent element and X is a trivalent element and wherein the molar ratio X2O3:YO2 is greater than 0.02:1; (ii) treating the zeolitic material provided in (i) with a liquid solvent system thereby obtaining a zeolitic material having a molar ratio X2O3:YO2 of at most 0.02:1, and at least partially separating the zeolitic material from the liquid solvent system; (iii) treating the zeolitic material obtained from (ii) with a liquid aqueous system having a pH in the range of 5.5 to 8 and a temperature of at least 75° C.
Abstract:
La presente invención se refiere a un catalizador para la oxidación de diesel (DOC) estratificado, que consiste en: a) un sustrato portador; b) un material catalítico para la oxidación de diesel que consiste en: b1) una primera capa colocada sobre el sustrato portador, la primera capa consistente en paladio impregnado sobre un material de soporte que contiene cerio en una cantidad de al menos 45% en peso, con base en el peso total del material de soporte, y como una opción contiene paladio; b2) una segunda capa colocada sobre la primer capa, la segunda capa consiste en paladio y platino cada uno impregnado sobre un material de soporte que consiste en un óxido metálico; en donde la relación en peso de platino a paladio de la primera capa es menor que la relación en peso de platino a paladio de la segunda capa.
Abstract:
A layered diesel oxidation catalyst (DOC) comprises: a) a carrier substrate; b) a diesel oxidation catalytic material comprising bl)a first layer located on the carrier substrate, the first layer comprising palladium impregnated on a support material comprising ceria in an amount of at least 45 weight% based on the total weight of the support material, and optionally comprising platinum; b2) a second layer located on the first layer, the second layer comprising palladium and platinum each impregnated on a support material comprising a metal oxide; wherein the platinum to palladium weight ratio of the first layer is lower than the platinum to palladium weight ratio of the second layer.
Abstract:
Un proceso para el postratamiento de un material zeolítico que tiene una estructura de armazón BEA, comprendiendo el proceso (i) proporcionar un material zeolítico que tenga una estructura de armazón BEA, en donde la estructura de armazón del material zeolítico comprende X2O3 y YO2, en donde Y es un elemento tetravalente y X es un elemento trivalente y en donde la relación molar X2O3:YO2 es mayor que 0.02:1, en donde Y se selecciona del grupo que consiste en Si, Sn, Ti, Zr, Ge, y combinaciones de dos o más de los mismos en donde X se selecciona del grupo que consiste en Al, B, In, Ga, Fe y combinaciones de dos o más de los mismos; (ii) tratar el material zeolítico provisto en (i) con un sistema de solvente líquido obteniendo así un material zeolítico que tiene una relación molar X2O3:YO2 de como máximo 0.02:1, y separando al menos parcialmente el material zeolítico del sistema de solvente líquido, en donde el sistema de solvente líquido se selecciona del grupo que consiste en agua, alcoholes monohídricos, alcoholes polihídricos y mezclas de dos o más de los mismos, en donde en (ii), el tratamiento se lleva a cabo a una temperatura en el intervalo de 50 a 125ºC; (iii) tratar el material zeolítico obtenido de (ii) con un sistema acuoso líquido con un pH en el rango de 5.5 a 8 y una temperatura de al menos 75°C, en donde el contenido de agua del sistema acuoso líquido es mayor que 50% en peso, en donde en (iii), el material zeolítico se trata con el sistema acuoso líquido durante un período en el intervalo de 0.5 a 24 h; en donde el pH del sistema acuoso usado en (iii) se determina usando un electrodo de vidrio sensible al pH.
Abstract:
Festkörper enthaltend (i) poröse Hülle auf der Basis mindestens eines Metalloxids, Kern (iii) auf der Basis von Kohlenstoff oder einem organischen Material, der von der Hülle umhüllt ist, sowie (ii) Metallpartikel, die sich auf und/oder in dem Kern befinden.