摘要:
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 Z 2 O 5 , one or more sources for X 2 O 3 , 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 Y0 2 , X 2 O 3 , and optionally Z 2 O 5 , 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 YO 2 are further provided in step (1 ).
摘要翻译:本发明涉及制备具有CHA骨架结构的沸石材料的方法,所述沸石材料包含具有核 - 壳结构的沸石晶体,其中所述方法包括以下步骤:(1) )提供一种混合物,该混合物包含用于Z 2 O 5 5的一种或多种来源,用于X 2 O 3 3的一种或多种来源, 任选的一种或多种结构导向剂和具有CHA骨架结构的晶种,其中晶种的CHA骨架结构包含Y0 2,X 2 O 其中所述晶种具有450nm或更大的直径;以及其中所述晶种具有450nm或更大的直径; (2)使(1)中提供的混合物结晶以得到包含步骤(1)中提供的晶种核和在晶种上结晶的壳的沸石晶体; 其中Z是五价元素,Y是四价元素,并且X是三价元素,并且其中优选在步骤(1)中进一步提供一种或多种YO 2的来源。 p>
摘要:
Zeolitic materials of the LEV-type structure and methods for their production are provided. The method for producing of the zeolitic material having an LEV-type structure comprising Y0 2 and optionally comprising X 2 O 3 comprises the steps of: (1) preparing a mixture comprising one or more sources for Y0 2 , one or more solvents, and optionally comprising seed crystals; and (2) crystallizing the mixture obtained in step (1), wherein Y is a tetravalent element, and X is a trivalent element, the mixture crystallized in step (2) contains 3 wt.-% or less of one or more metals M based on 100 wt-% of Y0 2 , even more preferably contains no metal M, wherein M stands for sodium or potassium.
摘要翻译:提供LEV型结构的沸石材料及其生产方法。 制备具有包含YO 2和任选地包含X 2 O 3的LEV型结构的沸石材料的方法包括以下步骤:(1)制备包含一种或多种用于Y02,一种或多种溶剂和任选包含晶种的源的混合物; 和(2)使步骤(1)中得到的混合物结晶,其中Y是四价元素,X是三价元素,在步骤(2)中结晶的混合物含有3重量%或更少的一种或多种金属M 基于100重量%的Y02,甚至更优选不含金属M,其中M代表钠或钾。
摘要:
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.
摘要:
A process for the preparation of a silicate compound, comprises (1) providing at least one layered silicate; and (2) mixing the layered silicate with water and at least one silicon containing compound according to formula R 4-m Si[-(SiR 2 ) n -R] m wherein at least one residue R is a leaving group and none of the residues R contains Si; m is 0, 1, 2, 3, 4; and n is an integer greater than or equal to 0.
摘要:
The present invention relates to a catalyst for the preparation of butadiene comprising Hf and two or more further catalytically active metals M1 and M2, wherein the two or more fur- ther 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; as well as to 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 theinventive catalyst, thereby obtaining a gas stream G-2 comprising butadiene; wherein the catalyst comprises Hf and two or more further catalytically active metals M and M2, wherein the twoor morefurther 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, as well as to the use of the catalyst comprises Hf and two or more further catalytically active 1 metals M1 and M2, wherein the twoor morefurther 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.
摘要:
Provided is a process for the preparation of a zeolitic material having a BEA framework structure comprising the steps of: (i) providing one or more zeolitic materials having a BEA framework structure, wherein the BEA framework structure comprises Y0 2 and X 2 O 3 , wherein Y is a tetravalent element, and X is a trivalent element; (ii) subjecting the one or more zeolitic materials provided in step (i) to a procedure for removing at least a portion of X, preferably tetrahedrally coordinated X, from the BEA framework structure; wherein the Y:X molar ratios of the one or more zeolitic materials provided in step (i) are respectively comprised in the range of from 1 to 50.
摘要:
The present invention relates to a process for the preparation of an isomorphously substituted RUB-36 silicate comprising (1) providing a mixture containing silica, preferably amorphous silica, and/or at least one silica precursor, water, at least one suitable structure directing agent, (2) heating the mixture obtained according to (1) under hydrothermal conditions to give a suspension containing an RUB-36 silicate, (3) separating the RUB-36 silicate, wherein (a) either the mixture according to (1) contains at least one element suitable for isomorphous substitution and/or (b) the separated RUB-36 silicate according to (3) is subjected to isomorphous substitution.
摘要:
A process for the preparation of a layered silicate containing at least silicon and oxygen, the layered silicate prepared by the process, and uses thereof are provided. The process comprises (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 a diethyldimethylammonium compound, a triethylmethylammonium compound, and a mixture of a diethyldimethylammonium compound 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 120 to 160 ℃ for a period in the range of from 5 to 10 days to give a suspension containing the layered silicate.
摘要:
The present invention relates to a process for the oxygen free conversion of methane to ethylene on zeolite catalysts and catalysts comprising a zeolite, a metal and a further component.
摘要:
The present invention relates to a process for the production of a pillared silicate comprising: (i) providing a layered silicate; (ii)interlayer expanding the layered silicate provided in step (i) comprising a step of treating the layered silicate with one or more swelling agents; (iii)treating the interlayer expanded silicate obtained in step (ii) with one or more hydrolyzable silicon containing compounds; (iv)treating the interlayer expanded compound obtained in step (iii) with an aqueous solution to obtain a pillared silicate; (v)removing at least a portion of the one or more swelling agents from the pillared silicate obtained in step (iv); (vi) impregnating the pillared silicate obtained in step (v) with one or more elements selected from the group consisting of Fe, Ru, Ir, and combinations of two or more thereof, as well as to a pillared silicate optionally obtainable from said process and its use, in particular in a process for the production of one or more olefins according to the invention.