Surface Properties of Texas Lignite Coal

摘要

The physicochemical structure of Texas lignite coal was characterized by examining N sub 2 , CO sub 2 , and H sub 2 O sorption and aqueous heats of immersion. BET surface areas developed from the isotherms were 1.12, 192.2, and 355.4 m exp 2 /g for N sub 2 , CO sub 2 , and H sub 2 O, respectively. Comparison indicated that Texas lignite behaved similarly to sub-bituminous Wyodak coal. Texas lignite char exhibited markedly different sorptions of N sub 2 and H sub 2 O, while CO sub 2 uptake in the char was nearly the same. Disparity in gas sorptions were attributed to elastic micropores and induced electronic effects. Heats of immersion of 108 J/g were found to be independent of outgassing temperature until plastic deformation of the coal structure occurred. (ERA citation 05:014707)