Portal de Periódicos da CAPES

Catalytic activity of alkali and iron salt mixtures for steam-char gasification

1993; Elsevier BV; Volume: 72; Issue: 6 Linguagem: Inglês

10.1016/0016-2361(93)90083-e

1873-7153

Byung Ho Song, Sang Done Kim,

Chemical Looping and Thermochemical Processes

The catalytic activity of five different binary mixtures of alkali (K2CO3, K2SO4, Na2CO3) and iron salts (FeSO4, Fe(NO3)3) on steam-char gasification at 700–800 °C was measured in a thermobalance reactor. Under the same experimental conditions with 3 wt% catalyst loading, the catalytic activity of the pure salts is in the order K2CO3Na2CO3 ≈ FeSO4K2SO4Fe(NO3)3. For K2SO4 and Na2CO3 the gasification rate could be enhanced by addition of iron salt. A synergistic effect of alkali and iron salts on the gasification rate was observed and the mixtures K2SO4 + FeSO4 and K2SO4 + Fe(NO3)3 exhibited better catalytic activity than K2CO3 at 800 °C. A kinetic parameter is proposed as a simple measure of activity of various catalysts based on the grain model. On the basis of the kinetic parameters and melting behaviour, K2SO4 + FeSO4 in the temperature range 700–800 °C is an effective catalyst for steam-char gasification.