液体アンモニア中でニッケル触媒を担持した石炭の水蒸気ガス化

抄録

A new method of catalyst addition on coal has been developed in. order to increase the contact area between catalyst and coal. Four coals were immersed into liquid ammonia solution of nickel thiocyanate at 120°C and 90 kg/cm₂. Upon the evaporation of ammonia, we obtained coals impregnated with the nickel salt. A remarkable increase in reactivity for the steam gasification was observed for all coals. For example, , when 2.0% of nickel was impregnated on Leopold coal by this method, the char conversion at 750°C after 2h was 73%. This value was 2 times as large as one observed for the con-ventional impregnation method. The observation of nickel particles on coal by a scanning electron microscope showed that nickel particles were well dispersed not only on the external surface of coal but also on the internal surface. The higher reactivity for the steam, gasification with the present method might be due to a better dispersion of nickel catalysts. on coal particles.