Journal
APPLIED CATALYSIS A-GENERAL
Volume 190, Issue 1-2, Pages 93-105Publisher
ELSEVIER
DOI: 10.1016/S0926-860X(99)00265-3
Keywords
skeletal isomerization; isobutene; ferrierite; SiCl4
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Ferrierite zeolite modified by the deposition of SiCl4, was prepared and investigated as a catalyst for the skeletal isomerization of 1-butene. The prepared catalysts were characterized by XRD, atomic absorption spectroscopy, ammonia TPD, FT-IR, BET/pore size distribution and pyridine chemisorption. The deposition of SiCl4 preserved zeolite crystallinity although XRD and FT-IR analysis suggested a little framework de-alumination not evidenced by chemical analysis. This treatment narrowed pore size and diminished the strong/weak and Bronsted/Lewis acid sites ratio. As the SiCl4 amount increased, the conversion of 1-butene decreased and selectivity to isobutene increased. This may be attributed to the higher spatial constraints inside the pores which restrict undesired reactions, such as 1-butene dimerization followed by cracking. The effect of temperature, weight hour space velocity and partial pressure of 1-butene was studied over modified and parent catalyst, indicating that a unimolecular mechanism prevails on modified samples while bimolecular processes are present on fresh ferrierite specially at short times on stream. (C) 2000 Elsevier Science B.V. All rights reserved.
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