High silica chabazite, its synthesis and its use in the conversion of oxygenates to olefins
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Abstract
A porous crystalline material is described having the chabazite framework type and having a composition involving the molar relationship:
X2O3:(n)YO2, wherein X is a trivalent element, such as aluminum, boron, iron, indium, and/or gallium; Y is a tetravalent element such as silicon, tin, titanium and/or germanium; and n is greater than 100 and typically greater than 200, such as about 300 to about 4000, for example from about 400 to about 1200. The material is synthesized in a fluoride medium and exhibits activity and selectivity in the conversion of methanol to lower olefins, especially ethylene and propylene.
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Citations
27 Claims
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1-21. -21. (canceled)
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22. A process for producing olefins comprising the step of contacting an organic oxygenate compound under oxygenate conversion conditions with a catalyst comprising a porous crystalline material having the structure of chabazite and having a composition involving the molar relationship:
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X2O3;
(n)YO2,wherein X is a trivalent element, Y is a tetravalent and n is greater than 100. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification