Group-contribution theory for coadsorption of gases and vapors on solid surfaces

摘要

This paper reports on the development of a group contribution theory for adsorption of n-alkanes of various lengths and some of their binary mixtures on BPL activated carbon. The basis for the approach is contained in Russell and LeVan (1996). The theory is derived from Guggenheim's lattice theory of solutions. Molecules are broken into "elements," and interactions between elements of various molecules and between elements and a heterogeneous surface are considered. Pure component isotherms for methane, ethane, n-butane, and n-hexane are treated first to determine parameters for the elements and their interaction energies with the surface. Then, using only the parameters determined from the pure component isotherms, experimental results are analyzed for mixtures of methane and n-hexane and ethane and n-hexane.