Kinetics and Mechanisms of NO(x) - Char Reduction.

Technical Report · Wed Dec 31 04:00:00 EST 1997

OSTI ID:600528

Suuberg, E M; Lilly, W D; Aarna, I

Variations in the pore structure of coal and coal char particles that occur during heat treatment and gasification are important in evaluating mass transfer behavior and available reactive surface areas within individual particles. Coals and coal chars exhibit complex and unique pore structure, with a wide distribution of sizes. Most of the surface area of coals is found in the micropores. The microporous structure of the precursor coal can sometimes apparently be preserved in chars that are not heated to a very high temperature. At very high temperatures, however, microporosity rapidly decreases presumably due to thermal breakage of the cross-links between planar regions in the char which can then pack more effectively. To efficiently use the active sites located in the micropores for reaction, a large number of feeder pores, to which the micropores are connected, is required. This is needed to limit the diffusion length within micropores. The pore structures of coals and chars have been shown to have an important effect on the combustion and oxidation of carbon particles.

• Research Organization: Brown Univ., Providence, RI (United States). Div. of Engineering
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
• DOE Contract Number: FG22-94PC94218
• OSTI ID: 600528
• Report Number(s): DOE/PC/94218--T2; ON: DE98051692
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON DIOXIDE
CHARS
COAL
EXPERIMENTAL DATA
GASIFICATION
NITROGEN OXIDES
PARTICLES
POROSITY
PROGRESS REPORT
TEMPERATURE DEPENDENCE