High temperature ammonia treatment of pitch particulates and fibers for nitrogen enriched microporous carbons

One step pyrolysis/activation of fine powder and fiber from anthracene oil-based pitch in ammonia atmosphere was successfully applied for producing microporous nitrogen enriched carbons. In the process, the preoxidized precursor was heat-treated in ammonia flow at 2 K/min to the final temperature in...

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Veröffentlicht in:Fuel processing technology 2014-03, Vol.119, p.211-217
Hauptverfasser: SWIETLIK, Urszula, GRZYB, Bartosz, TORCHAŁA, Kamila, GRYGLEWICZ, Grażyna, MACHNIKOWSKI, Jacek
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container_issue
container_start_page 211
container_title Fuel processing technology
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creator SWIETLIK, Urszula
GRZYB, Bartosz
TORCHAŁA, Kamila
GRYGLEWICZ, Grażyna
MACHNIKOWSKI, Jacek
description One step pyrolysis/activation of fine powder and fiber from anthracene oil-based pitch in ammonia atmosphere was successfully applied for producing microporous nitrogen enriched carbons. In the process, the preoxidized precursor was heat-treated in ammonia flow at 2 K/min to the final temperature in the range of 300-900 [degrees]C with 0.5 h soak. The intensive reaction of pitch powder with ammonia at 750-800 [degrees]C results in N uptake of -10 wt.% and generation of micropores of mean width 0.53-0.67 nm and very narrow pore size distribution (PSD). XPS analysis shows mostly pyridinic nitrogen. Not only increasing process temperature induces enhancement of micropore surface area (S sub(micro)) to 900 m super(2) g super(-1) but also widening PSD and reduction of nitrogen content. Similar behavior is observed on the ammonia activation of pitch fibers. The advantage of using fibrous precursor is a higher nitrogen uptake (12 wt.%) which can be combined with S sub(micro) of 880 m super(2) g super(1) and narrow PSD around 0.8 nm. The ammonia activation of stabilized pitch fibers seems to be a feasible route for producing nitrogen enriched microporous activated carbon fibers of narrow PSD and controllable pore width.
doi_str_mv 10.1016/j.fuproc.2013.11.009
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subjects Activation
Ammonia
Carbon
Chemistry
Colloidal state and disperse state
Enrichment
Exact sciences and technology
Fibers
General and physical chemistry
Heat treatment
Porosity
Porous materials
Precursors
title High temperature ammonia treatment of pitch particulates and fibers for nitrogen enriched microporous carbons
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