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Kinetics of catalyst loss during potassium-catalysed CO2 gasification of carbon

1985; Elsevier BV; Volume: 64; Issue: 9 Linguagem: Inglês

10.1016/0016-2361(85)90176-0

1873-7153

D. A. Sams, Tevan Talverdian, Farhang Shadman,

Thermochemical Biomass Conversion Processes

A significant fraction of the potassium catalyst can be lost by vaporization during catalysed carbon gasification. The extent of this loss depends primarily on the reaction start-up procedure. Temperature programmed experiments show that, under inert atmospheres, both KOH and K2CO3 react with carbon to give a reduced form of potassium-carbon complex. The formation of this complex appears to be a prerequisite for the vaporization of potassium. The rate of vaporization at 800 °C follows a first-order expression. Under gasification conditions, only a fraction of the catalyst is in this reduced form; therefore, the rate of catalyst loss during gasification is lower than that under inert atmospheres. The effect of catalyst loss on both the initial gasification rate and the variation in rate with conversion has been determined.