Characterization of porosity via secondary reactions. Quarterly technical progress report, 1 July 1995--1 October 1995

Technical Report · Sun Dec 31 04:00:00 EST 1995

DOI:https://doi.org/10.2172/211425· OSTI ID:211425

Calo, J M; Zhang, L

The following was accomplished during the reporting period: The random pore model was extended to correlate the development of microporosity in resin and Wyodak coal char. Conclusions derived from this analysis include: the random pore model can be extended to microporosity development for chars which are initially (i.e., at zero burn-off) microporous, assuming a normal micropore volume distribution. The resultant mean pore radius and variance prior to oxidation were, respectively, 1.04 nm and 0.24 nm for Wyodak coal char, and 0.64 nm and 0.18 nm for resin char. Consequently, the pore size is larger, and the pore distribution is broader for Wyodak coal char than for resin char prior to activation. The rate of mean micropore radius decrease with burn-off at high conversion is slower for resin char than for Wyodak coal char. This result suggests that the percentage of micropores converted to larger pores is smaller for resin char than for Wyodak coal char; i.e., resin char remains more microporous with burn-off. The nonmicroporous surface area was estimated by difference from the total surface area as determined from nitrogen adsorption data. These values correlate reasonably well with nonmicroporous surface areas determined from the {alpha}{sub s}-plot method.

• Research Organization: Brown Univ., Providence, RI (United States). Div. of Engineering
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91305
• OSTI ID: 211425
• Report Number(s): DOE/PC/91305--16; ON: DE96008828
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ADSORPTION
CHARS
CHEMICAL REACTION KINETICS
COAL
COAL GASIFICATION
EXPERIMENTAL DATA
NITROGEN
OXYGEN
POROSITY
PROGRESS REPORT
RESINS
SURFACE AREA