Methanol-to-Olefins Catalysis with Hydrothermally Treated Zeolite SSZ-39
Abstract
Zeolite SSZ-39 is evaluated for catalyzing the methanol-to-olefins (MTO) reaction. By steaming NH_4–SSZ-39, Al can be removed from framework positions, resulting in an increase in framework-Si/AlT and thus a lowered active acid site density. The Si/Al_T ratios can be controlled by the steaming temperatures. SSZ-39 steamed at 750 °C, with preserved pore volume and morphology, is an excellent MTO catalyst, as high, stable olefin selectivities, long time-on-stream activity, and low alkane production are observed. Moreover, interesting propylene/ethylene/butylene ratios of 2.8/1/1.1 are obtained, likely related to the shape of the AEI cage. By Cu^(2+)-exchanging SSZ-39, evidence is provided to show that Al_T sites in close proximity (high AlT density) produce the unwanted effects (higher alkane-make and carbonaceous deposits) in nonsteamed materials during MTO.
Additional Information
© 2015 American Chemical Society. ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Received: July 23, 2015; Revised: September 8, 2015; Publication Date (Web): September 17, 2015. M.D. acknowledges Research Foundation − Flanders, Belgium (FWO) for his postdoctoral funding and the Belgian American Educational Foundation (honorary fellow, boat of 2014). M.A.D. thanks The Dow Chemical Company for financial support. J.E.S. would like to thank the NDSEG for their support through a fellowship. PQ Corporation is thanked for providing us with sodium silicate and SACHEM inc. is thanked for providing the OSDAs.Attached Files
Published - acscatal_2E5b01577.pdf
Supplemental Material - cs5b01577_si_001.pdf
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Additional details
- Eprint ID
- 60564
- DOI
- 10.1021/acscatal.5b01577
- Resolver ID
- CaltechAUTHORS:20150928-091254944
- Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)
- Belgian American Educational Foundation
- Dow Chemical Company
- National Defense Science and Engineering Graduate (NDSEG) Fellowship
- Created
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2015-09-29Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field