n-Heptane hydroisomerization over Pt/MFI zeolite nanosheets: Effects of zeolite crystal thickness and platinum location

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Platinum was supported on MFI-type (ZSM-5) zeolites with various crystal thicknesses ranging from 300 to 2 nm (i.e., from bulk crystal to nanosheet). Two series of Pt/MFI were prepared by the ion exchange of Pt(NH3)(4)(2+) and the impregnation of colloidal Pt nanoparticles. The ion exchange yielded Pt nanoparticles that were supported inside zeolite pores, whereas the impregnation yielded Pt nanoparticles supported exclusively on the external crystal surfaces. The two series of Pt/MFI were used as catalysts for the hydroisomerization of n-heptane to investigate the effects of zeolite crystal thickness and Pt location. This research showed that the product selectivity to branched isomers could be significantly improved by decreasing zeolite crystal thickness to nanosheets. The selectivity improvement was attributed to short diffusion path lengths for branched products to escape before cracking. (C) 2013 Elsevier Inc. All rights reserved.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2013-05
Language
English
Article Type
Article
Keywords

MESOPOROUS SBA-15 SILICA; HEXANE HYDROISOMERIZATION; MOLECULAR-SIEVES; CATALYTIC-PROPERTIES; PARTICLE SIZE; CLUSTER-SIZE; SOLID ACIDS; ISOMERIZATION; NANOPARTICLES; SELECTIVITY

Citation

JOURNAL OF CATALYSIS, v.301, pp.187 - 197

ISSN
0021-9517
DOI
10.1016/j.jcat.2013.02.015
URI
http://hdl.handle.net/10203/174748
Appears in Collection
CH-Journal Papers(저널논문)
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