Formation of carbon nanotubes on iron/cobalt-modified zeolites: Effect of zeolite framework/pore structure and method of modification

S. Karakoulia; L. Jankovic; K. Dimos; D. Gournis; K. Triantafyllidis

doi:10.1016/s0167-2991(05)80364-7

Formation of carbon nanotubes on iron/cobalt-modified zeolites: Effect of zeolite framework/pore structure and method of modification

S. Karakoulia, L. Jankovic, K. Dimos, D. Gournis, K. Triantafyllidis^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

The present study focuses on the effect of the metal-modification method (ion-exchange or impregnation) and of the type of dealumination procedure (steaming, AHFS) of zeolite-Y on the quantity, quality and properties of the carbon nanotubes that are formed on the supported iron or cobalt oxides. Severe dealumination of zeolite-Y by steaming, which induced secondary meso/macropores, resulted in significant decrease in the carbon nanotube formation activity of the metal-impregnated zeolite-Y catalysts, while moderate dealumination by ammonium hexafluorosilicate had a less pronounced effect. The micro-Raman spectra revealed the presence of high quality as-grown CNTs with low degree of disordered.

Original language	English
Pages (from-to)	391-398
Number of pages	8
Journal	Studies in Surface Science and Catalysis
Volume	158 A
DOIs	https://doi.org/10.1016/s0167-2991(05)80364-7
State	Published - 2005
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Condensed Matter Physics
Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Formation of carbon nanotubes on iron/cobalt-modified zeolites: Effect of zeolite framework/pore structure and method of modification",

abstract = "The present study focuses on the effect of the metal-modification method (ion-exchange or impregnation) and of the type of dealumination procedure (steaming, AHFS) of zeolite-Y on the quantity, quality and properties of the carbon nanotubes that are formed on the supported iron or cobalt oxides. Severe dealumination of zeolite-Y by steaming, which induced secondary meso/macropores, resulted in significant decrease in the carbon nanotube formation activity of the metal-impregnated zeolite-Y catalysts, while moderate dealumination by ammonium hexafluorosilicate had a less pronounced effect. The micro-Raman spectra revealed the presence of high quality as-grown CNTs with low degree of disordered.",

author = "S. Karakoulia and L. Jankovic and K. Dimos and D. Gournis and K. Triantafyllidis",

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doi = "10.1016/s0167-2991(05)80364-7",

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pages = "391--398",

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T1 - Formation of carbon nanotubes on iron/cobalt-modified zeolites

T2 - Effect of zeolite framework/pore structure and method of modification

AU - Karakoulia, S.

AU - Jankovic, L.

AU - Dimos, K.

AU - Gournis, D.

AU - Triantafyllidis, K.

PY - 2005

Y1 - 2005

N2 - The present study focuses on the effect of the metal-modification method (ion-exchange or impregnation) and of the type of dealumination procedure (steaming, AHFS) of zeolite-Y on the quantity, quality and properties of the carbon nanotubes that are formed on the supported iron or cobalt oxides. Severe dealumination of zeolite-Y by steaming, which induced secondary meso/macropores, resulted in significant decrease in the carbon nanotube formation activity of the metal-impregnated zeolite-Y catalysts, while moderate dealumination by ammonium hexafluorosilicate had a less pronounced effect. The micro-Raman spectra revealed the presence of high quality as-grown CNTs with low degree of disordered.

AB - The present study focuses on the effect of the metal-modification method (ion-exchange or impregnation) and of the type of dealumination procedure (steaming, AHFS) of zeolite-Y on the quantity, quality and properties of the carbon nanotubes that are formed on the supported iron or cobalt oxides. Severe dealumination of zeolite-Y by steaming, which induced secondary meso/macropores, resulted in significant decrease in the carbon nanotube formation activity of the metal-impregnated zeolite-Y catalysts, while moderate dealumination by ammonium hexafluorosilicate had a less pronounced effect. The micro-Raman spectra revealed the presence of high quality as-grown CNTs with low degree of disordered.

UR - https://www.scopus.com/pages/publications/30944436224

U2 - 10.1016/s0167-2991(05)80364-7

DO - 10.1016/s0167-2991(05)80364-7

M3 - Article

AN - SCOPUS:30944436224

SN - 0167-2991

VL - 158 A

SP - 391

EP - 398

JO - Studies in Surface Science and Catalysis

JF - Studies in Surface Science and Catalysis

ER -

Formation of carbon nanotubes on iron/cobalt-modified zeolites: Effect of zeolite framework/pore structure and method of modification

Abstract

ASJC Scopus subject areas

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