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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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Effects of metal cation on the skeletal isomerization of 1-butene over clinoptilolite

Cited 5 times inthomson ciCited 9 times inthomson ci
Title
Effects of metal cation on the skeletal isomerization of 1-butene over clinoptilolite
Other Titles
Effects of metal cation on the skeletal isomerization of 1-butene over clinoptilolite
Author
Lee, Hyun ChulWOO, Hee ChulChung, Soo HyunKim, Hae JinLee, Kyung HeeLee, Jae Sung
Keywords
clinoptilolite; skeletal isomerization; acidity; selectivity; cobalt; FT-IR; NMR
Issue Date
2002-10
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF CATALYSIS, v.211, no.1, pp.216 - 225
Abstract
Skeletal isomerization of I-butene to isobutene has been investigated over various metal-cation-exchanged natural clinoptilolite zeolites. The effects of metal cation exchange were examined by XRD, NH3-TPD, FT-IR, and solid-state NMR to elucidate the controlling factors affecting the selectivity to isobutene. Cobalt-cation-exchanged natural clinoptilolite zeolite (Co-HNZ) showed a higher selectivity to isobutene compared with that of HNZ at the same conversion of n-butenes under the same reaction conditions, while barium-cation-exchanged zeolite (Ba-HNZ) exhibited a higher activity but a very low selectivity to isobutene. It could be suggested that the high selectivity over the Co-HNZ catalyst was induced by selective removal of strong acid sites that were responsible for the side reactions of dimerization cracking as well as by imposing an effective constraint on zeolite channels. On the other hand, the high density and easy accessibility of acid sites mainly on the external surface in Ba-HNZ could increase the extent of the bilmolecular reaction pathway, leading to high yields of by-products. Thus, a selective catalyst for skeletal isomerization of 1-butene should satisfy multiple requirements regarding its acid site, namely, strength, type, concentration, and accessibility. (C) 2002 Elsevier Science (USA)
URI
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DOI
10.1006/jcat.2002.3732
ISSN
0021-9517
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ECHE_Journal Papers
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