Studies on reactivity and porosity development in chars, and the carbon - carbon dioxide reaction via temperature-programmed desorption.

摘要

A new approach to the study of porosity and porosity development of chars during gasification was investigated. This approach involves the establishment of the relationships among the reaction rate, the amount of surface complexes evolved during post-activation temperature programmed desorption (TPD), and the porosity, as measured by gas adsorption techniques. In this method, the total surface area and micropore volume are determined by the interpretation of TPD spectra. Using an extended random pore model, additional information concerning the development of the micropore surface area, the nonmicroporous surface area, and the mean micropore radius as a function of burn-off can be determined. The combination of the TPD technique and the extended random pore model provides a new method for the characterization of char porosity.The effects of CO