The overall objectives of this project are to investigate reaction kinetics and develop simulation models for novel high temperature desulfurization sorbents tested were zinc ferrite and a zinc oxide- titanium oxide. The fractional conversion of sorbents selected by DOE will be measured during sulfidation and regeneration in a TGR over the temperature range of 1000 to 15000/degree/F and the pressure range of 1 to 20 atm. The chemical and physical property changes which occur in the sorbents during sulfidation and regeneration will be evaluated and their impact on the rate of reaction and sorbent capacity will be determined. Single particle and multiparticle models will be developed based on the TGR tests and used to simulate bench scale test results. Results are presented and discussed. 2 figs., 5 tabs.