A new low temperature approach to developing mesoporosity in metal-doped carbons for adsorption and catalysis

H. M. Williams, E. A. Dawson, P. A. Barnes, G. M.B. Parkes, L. A. Pears, C. J. Hindmarsh

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Key factors in achieving effective adsorption are the size of the pores relative to those of the adsorbate molecules and often the presence of small metal particles which can confer catalytic activity. While microporous carbons are excellent adsorbents for small molecules they are not as effective for larger species. A new low temperature approach to activation using an oxygen gas pulsing technique to achieve a carbon with controllable meso/micropore structure is described which also minimises metal sintering. The porosity of the samples was analysed by nitrogen adsorption at 77 K. Microporous metal-doped ASC carbon showed significant increases in the level of mesoporosity, its mesopore volume increasing from 0.06 to 0.24 cm3 g-1. However, undoped BPL carbon treated under the same conditions remained unchanged. The catalytic effect of the metals in the ASC carbon is thought to account for the observed mesopore development. At the temperatures used, a continuous oxidative activation yielded no pore widening in either carbon, suggesting that the gas pulsing method is far more effective in increasing mesopore sizes.

Original languageEnglish
Pages (from-to)557-564
Number of pages8
JournalJournal of Porous Materials
Volume16
Issue number5
DOIs
Publication statusPublished - Oct 2009

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Catalysis
Carbon
Metals
Adsorption
Gases
Chemical activation
Temperature
Molecules
Adsorbates
Adsorbents
Catalyst activity
Nitrogen
Sintering
Porosity
Oxygen
Whetlerite

Cite this

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title = "A new low temperature approach to developing mesoporosity in metal-doped carbons for adsorption and catalysis",
abstract = "Key factors in achieving effective adsorption are the size of the pores relative to those of the adsorbate molecules and often the presence of small metal particles which can confer catalytic activity. While microporous carbons are excellent adsorbents for small molecules they are not as effective for larger species. A new low temperature approach to activation using an oxygen gas pulsing technique to achieve a carbon with controllable meso/micropore structure is described which also minimises metal sintering. The porosity of the samples was analysed by nitrogen adsorption at 77 K. Microporous metal-doped ASC carbon showed significant increases in the level of mesoporosity, its mesopore volume increasing from 0.06 to 0.24 cm3 g-1. However, undoped BPL carbon treated under the same conditions remained unchanged. The catalytic effect of the metals in the ASC carbon is thought to account for the observed mesopore development. At the temperatures used, a continuous oxidative activation yielded no pore widening in either carbon, suggesting that the gas pulsing method is far more effective in increasing mesopore sizes.",
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A new low temperature approach to developing mesoporosity in metal-doped carbons for adsorption and catalysis. / Williams, H. M.; Dawson, E. A.; Barnes, P. A.; Parkes, G. M.B.; Pears, L. A.; Hindmarsh, C. J.

In: Journal of Porous Materials, Vol. 16, No. 5, 10.2009, p. 557-564.

Research output: Contribution to journalArticle

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T1 - A new low temperature approach to developing mesoporosity in metal-doped carbons for adsorption and catalysis

AU - Williams, H. M.

AU - Dawson, E. A.

AU - Barnes, P. A.

AU - Parkes, G. M.B.

AU - Pears, L. A.

AU - Hindmarsh, C. J.

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AB - Key factors in achieving effective adsorption are the size of the pores relative to those of the adsorbate molecules and often the presence of small metal particles which can confer catalytic activity. While microporous carbons are excellent adsorbents for small molecules they are not as effective for larger species. A new low temperature approach to activation using an oxygen gas pulsing technique to achieve a carbon with controllable meso/micropore structure is described which also minimises metal sintering. The porosity of the samples was analysed by nitrogen adsorption at 77 K. Microporous metal-doped ASC carbon showed significant increases in the level of mesoporosity, its mesopore volume increasing from 0.06 to 0.24 cm3 g-1. However, undoped BPL carbon treated under the same conditions remained unchanged. The catalytic effect of the metals in the ASC carbon is thought to account for the observed mesopore development. At the temperatures used, a continuous oxidative activation yielded no pore widening in either carbon, suggesting that the gas pulsing method is far more effective in increasing mesopore sizes.

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