Abstract:
PROBLEM TO BE SOLVED: To provide an organotemplate-free synthetic process for the production of a zeolitic material having a BEA framework structure comprising YOand optionally comprising XO.SOLUTION: The process comprises the steps of: (1) preparing a mixture comprising seed crystals, at least one source for YOand at least one source for XO; (2) crystallizing the mixture; and (6) subjecting the zeolitic material having a BEA framework structure to an ion-exchange procedure, wherein Y is a tetravalent element, and X is a trivalent element. The seed crystals comprise zeolitic material having a BEA framework structure. In the step (6), at least one ionic non-framework element contained in the zeolitic material having a BEA framework is ion-exchanged against Fe and/or Cu.
Abstract:
A process for the preparation of butadiene comprising (i) providing a gas stream G-1 comprising ethanol; (ii) contacting the gas stream G-1 provided in (i) with a catalyst, thereby obtaining a gas stream G-2 comprising butadiene; wherein the catalyst comprises a crystalline material supporting one or more catalytically active metals M, as well as to the use of the crystalline material supporting one or more catalytically active metals M.
Abstract:
The present invention relates to a process comprising the step of converting methane to ethene under non-oxidative conditions in the presence of a catalyst comprising (a) a zeolite with a largest pore opening which is larger than 8; (b) a metal whereas the metal (b) is loaded onto the zeolite (a); and whereas the zeolite (a) is selected from zeolites -with a maximum diameter of a sphere that can be included of 4.5 A or smaller and/or -with a maximum diameter of a sphere which can diffuse along a of 4.4 A or smaller and/or -with a maximum diameter of a sphere which can diffuse along b of 4.4 A or smaller and/or -with a maximum diameter of a sphere which can diffuse along c of 4.4 A or smaller. Zeolite (a) is preferably a RRO catalyst, in particular RUB-41.
Abstract:
The present invention relates to a process for the preparation of a zeolitic material having a CHA framework structure, said zeolitic material comprising zeolite crystals having a core-shell structure, wherein said process comprises the steps of (1) providing a mixture comprising one or more sources for Z2O5, one or more sources for X2O3, optionally one or more structure directing agents, and seed crystals having a CHA framework structure, wherein the CHA framework structure of the seed crystals comprises Y02, X2O3, and optionally Z2O5, and wherein the seed crystals have a diameter of 450 nm or greater; (2) crystallizing the mixture provided in (1) to afford zeolite crystals comprising a core of seed crystal provided in step (1 ) and a shell crystallized on the seed crystal; wherein Z is a pentavalent element, Y is a tetravalent element, and X is a trivalent element, and wherein preferably one or more sources for YO2 are further provided in step (1 ).
Abstract:
The present invention relates to a process for the preparation of a layered silicate containing at least silicon and oxygen, comprising (1) providing a mixture containing silica and/or at least one silica precursor, water, at least one tetraalkylammonium compound selected from the group consisting of diethyldimethylammonium compound, a triethylmethylammonium compound, and a mixture of a diethyldimethylammonium and a triethylmethylammonium compound, and at least one base, and optionally at least one suitable seeding material; and (2) heating of the mixture obtained according to (1) under autogenous pressure (hydrothermal conditions) to a temperature in the range of from to 120 to 160 °C for a period in the range of from 5 to 10 days to give a suspension containing the layered silicate.
Abstract:
Providing a catalyst and a process for the preparation of butadiene, and the catalyst comprising Hf and two or more further catalytically active metals M1 and M2, wherein the two or more further catalytically active metals M1 and M2 are selected from the group consisting of Zr, Zn, Cu and combinations of two or more thereof, and wherein M1 is different from M2.
Abstract:
A process for the preparation of an isomorphously substituted layered silicate comprising (1) providing a mixture containing silica or a precursor thereof, at least one structure directing agent (SDA) allowing for the crystallization of the layered silicate, and water; (2) heating the mixture obtained according to (1) under hydrothermal conditions; (3) adding at least one source at least one element suitable for isomorphous substitution; (4) heating the mixture obtained according to (3) under hydrothermal conditions.
Abstract:
A process for the preparation of an isomorphously substituted layered silicate comprising (1) providing a mixture containing silica or a precursor thereof, at least one structure directing agent (SDA) allowing for the crystallization of the layered silicate, and water; (2) heating the mixture obtained according to (1) under hydrothermal conditions; (3) adding at least one source at least one element suitable for isomorphous substitution; (4) heating the mixture obtained according to (3) under hydrothermal conditions.
Abstract:
Un proceso para la producción de un material zeolítico que tiene una estructura de entramado MWW que comprende YO2 y B2O3, en donde Y es Si, dicho proceso comprende: (i) preparar una mezcla que comprende una o más fuentes de YO2, una o más fuentes de B2O3, una o más organoplantillas, y cristal germen, (ii) cristalizar la mezcla obtenida en (i) para obtener un precursor laminar de la estructura de entramado MWW, (iii) calcinar el precursor laminar obtenido en (ii) para obtener el material zeolítico que tiene una estructura de entramado MWW, en donde una o más organoplantillas tienen la fórmula (I) R1R2R3N (I) en donde R1 es ciclohexilo, y en donde R2 y R3 son, independientemente, H, y en donde la mezcla preparada en (i) y cristalizada en (ii) contiene 35 % en peso o menos de H2O basado en el 100 % en peso de YO2 contenido en la mezcla preparada en (i) y cristalizada en (ii), en donde el precursor laminar obtenido en (ii) es B-MCM-22(P). en donde el material zeolítico que tiene una estructura de entramado MWW obtenido en iii) es B-MCM-22, en donde la mezcla preparada en (i) y cristalizada en (ii) contiene 5 % en peso o menos de fluoruro calculado como elemento y basado en el 100 % en peso de YO2.
Abstract:
The present invention relates to a process for the preparation of a layered silicate containing at least silicon and oxygen, comprising (1) providing a mixture containing silica and/or at least one silica precursor, water, at least one tetraalkylammonium compound selected from the group consisting of diethyldimethylammonium compound, a triethylmethylammonium compound, and a mixture of a diethyldimethylammonium and a triethylmethylammonium compound, and at least one base, and optionally at least one suitable seeding material; and (2) heating of the mixture obtained according to (1) under autogenous pressure (hydrothermal conditions) to a temperature in the range of from to 120 to 160° C. for a period in the range of from 5 to 10 days to give a suspension containing the layered silicate.