Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Acrylsäure umfassend (i) Bereitstellen eines Stoffstroms enthaltend eine Formaldehyd-Quelle und Essigsäure und (ii) Inkontaktbringen dieses Stoffstroms mit einem Aldolkondensationskatalysator enthaltend ein zeolithisches Material, wobei die Gerüststruktur des zeolithischen Materials gemäß (ii) Si, O, und ein molares Verhältnis AI : Si von von 0 : 1 bis 0,001 : 1 aufweist; und wobei die Gerüststruktur des zeolithischen Materials gemäß (ii), zusätzlich zu Si und gegebenenfalls AI, ein oder mehrere Elemente, ausgewählt aus der Gruppe bestehend aus von Si verschiedenen tetravalenten Elementen Y und von AI verschiedenen trivalenten Elementen X, enthält.
Abstract:
The present invention relates to a process for the production of a zeolitic material having a BEA-type framework structure comprising YO 2 and X2O 3 , wherein said process comprises the steps of (1)preparing a mixture comprising one or more sources for YO 2 and one or more sources for X 2 O 3 ; (2)crystallizing the mixture obtained in step (1); (3)subjecting the zeolitic material having a BEA-type framework structure obtained in step (2) to an ion-exchange procedure with Cu; and (4) subjecting the Cu ion-exchanged zeolitic material obtained in step (3) to an ion-exchange procedure with Fe; wherein Y is a tetravalent element, and X is a trivalent element, wherein the mixture provided in step (1) and crystallized in step (2) further comprises seed crystals comprising one or more zeolitic materials having a BEA-type framework structure, and wherein the mixture provided in step (1) and crystallized in step (2) does not contain an organotemplate as a structure-directing agent, as well as to the zeolitic material having a BEA framework structure per se, and to its use, in particular in a method for the treatment of NO x by selective catalytic reduction (SCR).
Abstract:
The present invention relates to a catalyst for the conversion of oxygenates to olefins, wherein the catalyst comprises one or more zeolites of the MFI, MEL and/or MWW structure type and particles of one or more metal oxides, the one or more zeolites of the MFI, MEL and/or MWW structure type comprising one or more alkaline earth metals selected from the group consisting of Mg, Ca, Sr, Ba and combinations of two or more thereof, wherein the catalyst displays a water uptake of 9.0 wt.-% or less, as well as to a process for the production thereof and to its use, in particular in a process for converting oxygenates to olefins.
Abstract:
A process for the production of a powder or granulate, comprising (I) providing a zeolitic material; (II) suspending the zeolitic material provided in step (I) in a solvent system; (III) mixing the suspension obtained in step (II) with one or more binders; (IV) drying the suspension obtained in step (III); and (V) calcining of the dried material obtained in step (IV); wherein the zeolitic material provided in step (I) has an MFI-type framework structure comprising YO 2 and optionally comprising X 2 O 3 , wherein Y is a tetravalent element, and X is a trivalent element, said material having an X-ray diffraction pattern comprising at least the following reflections: (I) wherein 100% relates to the intensity of the maximum peak in the X-ray powder diffraction pattern, as well as to a powder or granulate per se and to its use.
Abstract:
The present invention relates to a process for the oxygen free conversion of methane to ethylene on zeolite catalysts and catalysts comprising a small-pore a small-pore zeolite, a metal and a further component.
Abstract:
The present invention relates to a gas-phase process for the preparation of butadiene comprising (i) providing a gas stream G-1 comprising ethanol; (ii) contacting the gas stream G-1 comprising ethanol with a catalyst, thereby obtaining a gas stream G-2 comprising butadiene, wherein the catalyst comprises a zeolitic material having a framework structure comprising YO 2 , Y standing for one or more tetravalent elements, wherein at least a portion of Y comprised in the framework structure is isomorphously substituted by one or more elements X, as well as to a zeolitic material having a framework structure comprising YO 2 , Y standing for one or more tetravalent elements, wherein at least a portion of Y comprised in the framework structure is isomorphously substituted by one or more elements X, wherein the zeolitic material displays a specific X-ray powder diffraction pattern, and to its use.
Abstract:
The present invention relates to a process for the preparation of a zeolitic material comprising the steps of: (1) providing a mixture comprising one or more sources for YO 2 and one or more alkenyltrialkylammonium cation R 1 R 2 R 3 R 4 N + -containing compounds as structure directing agent; and (2) crystallizing the mixture obtained in step (1) to obtain a zeolitic material; wherein Y is a tetravalent element, and wherein R 1 , R 2 , and R 3 independently from one another stand for alkyl; and R 4 stands for alkenyl, as well as to zeolitic materials which may be obtained according to the inventive process and to their use.
Abstract translation:本发明涉及一种制备沸石材料的方法,包括以下步骤:(1)提供包含一种或多种YO 2源和一种或多种烯基三烷基铵阳离子R 1 R 2 R 3 R 4 N +化合物作为结构导向剂的混合物; 和(2)使步骤(1)中获得的混合物结晶以获得沸石材料; 其中Y是四价元素,并且其中R 1,R 2和R 3彼此独立地代表烷基; 并且R4代表烯基,以及可以根据本发明方法获得的沸石材料及其用途。
Abstract:
The invention concerns a method of producing a passivated catalyst containing a zeolite and at least one active metal, characterized in that the catalyst is held in a fluidized bed where it is passivated with a silicon compound.