The surface complexes formed by the chemisorption of oxygen-containing gases (O 2 , CO 2 , and H 2 O) on Morwell coal char were investigated by using a temperature-programmed desorption (TPD) technique. TPD patterns of the chemisorbed chars indicated that there are many types of oxygen complexes both on carbon and mineral matter (Ca and Fe), and the amount and feature of these complexes strongly depends on the adsorption conditions. The study on Ca-derived surface complexes revealed that oxygen easily moved around over carbon and Ca. The Ca-catalyzed gasification mechanism is discussed in relation to the present TPD results. The solid-state reaction between CaCO 3 and C does not occur during the gasification, but Ca catalyst functions as the medium for oxygen transfer.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology