High silica chabazite, its synthesis and its use in the conversion of oxygenates to olefins

• US 7,435,863 B2
• Filed: 10/31/2006
• Issued: 10/14/2008
• Est. Priority Date: 03/15/2002
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: ExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Reyes, Sebastian C., Levin, Doron, Strohmaier, Karl G.
• Primary Examiner(s): Wood; Elizabeth D
• Application Number:
  US11/590,230
• Publication Number:
  US 20070043251A1
• Time in Patent Office: 714 Days
• Field of Search: 585/638, 585/639, 585/640
• US Class Current: 585/640
• CPC Class Codes: B01J 29/7015 CHA-type, e.g. Chabazite, LZ-218
• CPC Class Codes: C01B 39/46 Other types characterised by their X-ray diffraction pattern and their defined composition C01B39/023, C01B39/026, C01B39/06 take precedence
• CPC Class Codes: C01B 39/48 using at least one organic template directing agent
• CPC Class Codes: C07C 1/20 starting from organic compounds containing only oxygen atoms as heteroatoms
• CPC Class Codes: C07C 11/02 Alkenes
• CPC Class Codes: Y02P 30/20 using bio-feedstock
• CPC Class Codes: Y02P 30/40 Ethylene production

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.

Claims

1. 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, as synthesized, involving the molar relationship:

X₂O₃;

(n)YO_2,

wherein X is a trivalent element, Y is a tetravalent, and n is from greater than 100 to about 4000.

2. The process of claim 1 wherein n is greater than 200.

3. The process of claim 1 wherein n is from about 150 to about 2000.

4. The process claim 1 wherein n is from about 200 to about 600.

5. The process of claim 1 wherein X comprises aluminum and Y comprises silicon.

6. The process of claim 1 wherein said organic oxygenate compound is selected from methanol, dimethyl ether, and mixtures thereof.

7. The process of claim 1 wherein said organic oxygenate compound comprises methanol, dimethyl ether, and mixtures thereof.

8. The process of claim 1, wherein X is selected from aluminum, boron, indium, and/or gallium, and wherein Y is selected from silicon, tin, titanium, and/or germanium.

9. The process of claim 1, wherein the porous crystalline material, as synthesized, consists essentially of an oxide of trivalent element X and an oxide of tetravalent element Y.