| Abstract
| - The activity of potassium-containing char briquettes, for NOx reduction, has been investigatedat 350 °C, using a mixture of 0.2%NO/5%O2/N2. The samples have been prepared from a Spanishbituminous coal and a coal tar−formaldehyde resin (resole) as binder. The influence of a numberof variables relating to the preparation process, such potassium loading and pyrolysis temperature,on their reduction capacity has been analyzed. For comparative purposes, a set of binder-freesamples with different potassium contents has been prepared. Potassium contents highly affectthe selectivity of the briquettes. Samples prepared with high potassium loading exhibit satisfactoryselectivity values with very low burnoff. Lifetime tests, until complete consumption of the sample,have been performed with the samples exhibiting high selectivity values. The most importantfinding is that high selectivity values are maintained during the whole life of the briquette. Thebinder affects the reaction kinetic and the lifetime of the sample. A binder-free sample presentshigher activity with regard to binder samples.
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