期刊
ACS CATALYSIS
卷 5, 期 10, 页码 6078-6085出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b01577
关键词
zeolite; SSZ-39; methanol-to-olefins; heterogeneous catalysis; steaming; AEI
资金
- Research Foundation - Flanders, Belgium (FWO)
- Belgian American Educational Foundation
- Dow Chemical Company
- NDSEG
Zeolite SSZ-39 is evaluated for catalyzing the methanol-to-olefins (MTO) reaction. By steaming NH4-SSZ-39, Al can be removed from framework positions, resulting in an increase in framework-Si/Al-T 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 degrees 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 Cu2+-exchanging SSZ-39, evidence is provided to show that Al-T sites in close proximity (high Al-T density) produce the unwanted effects (higher alkane-make and carbonaceous deposits) in nonsteamed materials during MTO.
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