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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Skeletal isomerization of n-butenes to isobutene over acid-treated natural clinoptilolite zeolites

Cited 14 times inthomson ciCited 18 times inthomson ci
Title
Skeletal isomerization of n-butenes to isobutene over acid-treated natural clinoptilolite zeolites
Other Titles
Skeletal isomerization of n-butenes to isobutene over acid-treated natural clinoptilolite zeolites
Author
Lee, Hyun ChulWoo, Hee ChulRyoo, RyongLee, Kyung HeeLee, Jae Sung
Keywords
clinoptilolite; skeletal isomerization; acidity; selectivity; coke deposition
Issue Date
2000-03
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED CATALYSIS A-GENERAL, v.196, no.1, pp.135 - 142
Abstract
The proton form of the natural clinoptilolite zeolite (HNZ) was modified by treatment with various acids. Effects of modification on catalytic performance were investigated for the skeletal isomerization of n-butenes to isobutene. Among HNZs treated with various acids, only those modified with boric acid (B-HNZ) showed an improved catalytic performance of skeletal isomerization in terms of activity and stability. Furthermore, B-HNZ exhibited higher isobutene selectivity compared to unmodified HNZ at the same conversion of n-butenes. The performance was comparable to that of a widely known ferrierite catalyst at the same reaction conditions. The main effect of boric acid treatment on HNZ was the selective increase in the number of acid sites of moderate strength required for efficient catalysts in skeletal isomerization without collapse of its framework. These acid sites of moderate strength were considered to be selective and stable reaction sites for skeletal isomerization of n-butenes. Coke deposition poisoned non-selective strong acid sites and imposed a spatial restriction on zeolite channels, leading to suppression of undesired dimerization reactions. Factors affecting selectivity to isobutene an discussed. (C) 2000 Elsevier Science B.V. All rights reserved
URI
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DOI
10.1016/S0926-860X(99)00458-5
ISSN
0926-860X
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ECHE_Journal Papers
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