Chemical vapor deposition: Stable carbons from low-rank coals

Journal Article · Tue Dec 31 04:00:00 EST 1996 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry

OSTI ID:430323

Sharma, R K; Kulas, R W; Olson, E S ^[1]

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1. Univ. of North Dakota, Grand Forks, ND (United States)

A chemical vapor deposition (CVD) technique has been used to increase the oxidative stability of activated carbons. Activated carbons prepared from Gascoyne lignite (North Dakota) by thermal or potassium hydroxide activations were subjected to BCI, in helium at 727{degrees}C with or without benzene for a limited period of time, followed by annealing in helium at 900{degrees}C for three days. Untreated and acid-washed coal samples were used to assess the magnitude of the effect of mineral matter in the coal on the boron coating. The oxidative stability of the boron-modified carbons was determined from the decomposition curves obtained from the thermogravimetric analysis. Modification of the as-received, KOH-treated carbon yielded oxidatively stable carbons up to an initial temperature of 520{degrees}C, compared to about 350{degrees}C for the starting material. Similar results were obtained for the carbonized Gascoyne lignite. Sulfurous acid washing of the Gascoyne significantly enhanced the thermal stability (600{degrees}C) of the boron-modified carbon.

• OSTI ID: 430323
• Report Number(s): CONF-960807--
• Journal Information: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry Journal Issue: 4 Vol. 41; ISSN 0569-3772; ISSN ACFPAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ACTIVATED CARBON
ANNEALING
BORON CARBIDES
CHEMICAL VAPOR DEPOSITION
HEAT TREATMENTS
LIGNITE
MINERALS
OXIDATION
POTASSIUM HYDROXIDES
STABILITY
SULFUROUS ACID
SURFACE AREA
THERMAL GRAVIMETRIC ANALYSIS