Bhawe, Yashodhan and Moliner-Marin, Manuel and Lunn, Jonathan D. and Liu, Yu and Malek, Andrzej and Davis, Mark (2012) Effect of Cage Size on the Selective Conversion of Methanol to Light Olefins. ACS Catalysis, 2 (12). pp. 2490-2495. ISSN 2155-5435 http://resolver.caltech.edu/CaltechAUTHORS:20130124-161852094
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Zeolites that contain eight-membered ring pores but different cavity geometries (LEV, CHA, and AFX structure types) are synthesized at similar Si/Al ratios and crystal sizes. These materials are tested as catalysts for the selective conversion of methanol to light olefins. At 400 °C, atmospheric pressure, and 100% conversion of methanol, the ethylene selectivity decreases as the cage size increases. Variations in the Si/Al ratio of the LEV and CHA show that the maximum selectivity occurs at Si/Al = 15–18. Because lower Si/Al ratios tend to produce faster deactivation rates and poorer selectivities, reactivity comparisons between frameworks are performed with solids having a ratio Si/Al = 15–18. With LEV and AFX, the data are the first from materials with this high Si/Al. At similar Si/Al and primary crystallite size, the propylene selectivity for the material with the CHA structure exceeds those from either the LEV or AFX structure. The AFX material gives the shortest reaction lifetime, but has the lowest amount of carbonaceous residue after reaction. Thus, there appears to be an intermediate cage size for maximizing the production of light olefins and propylene selectivities equivalent to or exceeding ethylene selectivities.
|Additional Information:||© 2012 American Chemical Society. Received: August 21, 2012; Revised: October 5, 2012; Published: October 18, 2012. The authors thank The Dow Chemical Company for financial support of this work. The authors also thank Chengli Zu and Suzanne Lehr of Analytical Sciences at The Dow Chemical Company for their assistance with the GC/MS work.|
|Subject Keywords:||methanol-to-olefins; zeolite; CHA; LEV; AFX|
|Official Citation:||Effect of Cage Size on the Selective Conversion of Methanol to Light Olefins Yashodhan Bhawe, Manuel Moliner-Marin, Jonathan D. Lunn, Yu Liu, Andrzej Malek, and Mark Davis ACS Catalysis 2012 2 (12), 2490-2495|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||25 Jan 2013 00:28|
|Last Modified:||25 Jan 2013 00:28|
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