Kinetic of Catalytic CO₂Gasification for Cyprus Coal by Gas-Solid Reaction Model

Abstract

− In general, the coal gasification has to be operated under high temperature (1300~1400 o C) and pressure (30~40 bar). However, to keep this conditions, it needs unnecessary and excessive energy. In this work, to reduce the temperature of process, alkali catalysts such as K 2 CO 3 and Na 2 CO 3 were added into Cyprus coal. We investigated the kinetic of Cyprus char-CO 2 gasification. To determine the gasification conditions, the coal (with and without catalysts) gasified with fixed variables (catalyst loading, catalytic effects of Na 2 CO 3 and K 2 CO 3 , temperatures) by using TGA. When catalysts are added by physical mixing method into Cyprus coal the reaction rate of coal added 7 wt% Na 2 CO 3 is faster than raw coal for Cyprus char-CO 2 gasification. The activation energy of coal added 7 wt% Na 2 CO 3 was calculated as 63 kJ/mol which was lower than raw char. It indicates that Na 2 CO 3 can improve the reactivity of char-CO 2 gasification.