THERMAL-DESORPTION FROM DISCRETELY HETEROGENEOUS SURFACES WITH ACCOUNT FOR DIFFUSION BETWEEN VARIOUS SURFACE REGIONS

Authors
SAVCHENKO VI
Citation
Vi. Savchenko, THERMAL-DESORPTION FROM DISCRETELY HETEROGENEOUS SURFACES WITH ACCOUNT FOR DIFFUSION BETWEEN VARIOUS SURFACE REGIONS, Reaction kinetics and catalysis letters, 49(2), 1993, pp. 251-259
Citations number
15
Categorie Soggetti
Chemistry Physical
Journal title
Reaction kinetics and catalysis letters → ACNP
ISSN journal
01331736
Volume
49
Issue
2
Year of publication
1993
Pages
251 - 259
Database
ISI
SICI code
0133-1736(1993)49:2<251:TFDHSW>2.0.ZU;2-9
Abstract
Calculations for a discretely heterogeneous surface consisting of patc hes s1 and s2 with different adsorption heats of particles, A(ads) hav e been made. The calculated data show that under equilibrium distribut ion of particles between s1 and s2 the desorption rate over route II: s1 A(ads) --> s2 * A(ads) --> A(gas) considerably increases compared to the ''direct'' desorption over route I: s1 A(ads) --> A(gas). Th is effect is ascribed to the entropy variations of adsorbed,layers on patches s1 and s2.