Abstract
The skeletal isomerization of n-butenes to isobutene has been carried out over ferrierite catalysts (Si/Al ~ 15) containing different acid sites distribution and different amount of defects. The zeolite crystals were synthesized under hydrothermal conditions in fluoride medium in the absence of alkaline cations by using suitable combinations of structure directing agents. Template-driven low density of acid sites in 10-membered-ring channels enhances the isobutene selectivity and decreases catalyst deactivation. The presence of high amount of silanol groups and Lewis acid sites increases the yields of by-products and catalysts decay.
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Acknowledgments
We are thankful for the financial support of the Spanish Ministry of Science and Innovation (MICINN, former MEC), project CTQ2006-06282. A.B·P. acknowledges the Spanish MICINN for a predoctoral grant. R.G. acknowledges the J.A.E. contract (CSIC).
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Márquez-Alvarez, C., Pinar, A.B., García, R. et al. Influence of Al Distribution and Defects Concentration of Ferrierite Catalysts Synthesized From Na-Free Gels in the Skeletal Isomerization of n-Butene. Top Catal 52, 1281–1291 (2009). https://doi.org/10.1007/s11244-009-9273-6
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DOI: https://doi.org/10.1007/s11244-009-9273-6