Abstract
The kinetics of the removal of ozone from air by granular activated carbon (GAC) has been investigated. Twenty GACs with different textural and chemical surface properties were used in this study. The kinetic experiments were carried out in an expanded bed reactor (EBR) and in a packed bed reactor (PBR). A rate equation that takes into account thermal ozone decomposition and removal of ozone by GAC due to chemisorption and catalytic decomposition has been proposed. Deactivation kinetics has also been considered in the reaction model. Intrinsic rate constants for thermal ozone removal (kT), chemisorption of ozone (k1), and GAC-catalyzed decomposition of ozone (k2), as well as deactivation rate constants (kd1 and kd2) have been evaluated from dynamic modeling. At the conditions used in this work, ozone was thermally stable only below 323 K. Above this temperature, ozone partially decomposed even in the absence of GAC. Temperature favored the rate of ozone removal by GAC following Arrhenius behavior while ai...
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