Kinetic study of steam gasification of two mineralogically different lignite chars: An active site/intermediate model

Lignite-char gasification mechanism in mixed atmospheres of steam and CO 2 at different pressures

“…(15) and (16) were compared with the experimental results. The parity plot is used to compare experimental data against predicted data, where abscissa is the predicted value based on specific mechanism, and ordinate is the corresponding experimental value.…”

“…such as homogenous reaction model, shrinking core model, mixing reaction model, active energy distribution model, and random pore model, et al [13,14], which are important to clarify physical aspects of the char conversion system. In the aspect of char surface reaction mechanism, a new active site/intermediate model intimately fit the kinetic profiles for both catalyzed and un-catalyzed gasification for varying chars [15]. In the mixture of H 2 O and CO 2 , char-H 2 O reaction was independent on char-CO 2 reaction, whereas the latter reaction was inhibited by the former reaction [16].…”

Effects of coal drying on the pyrolysis and in-situ gasification characteristics of lignite coals

“…Therefore, for the sake of illustrating these phenomena, CO 2 chemisorption experiments of chars were held to measure the amounts of catalytic active sites as the catalytic active sites in the coal char are key factors for determining the gasification rate [26,32].…”

THE KINETICS OF CaO ASSISTED PATTUKKU CHARCOAL STEAM GASIFICATION

“…The RPM was proposed by Bhatia and Perlmutter. This model assumes that the char consists of cylindrical pores with random size distributions (Bhatia and Perlmutter, 1980;Zhang et al, 2010;Tang et al, 2015). The reaction rate is then expressed in the form of…”