Active carbon precursors modified by nitrogen function incorporation

摘要

Lignite and subbituminous coal were treated with nitrogenating reagents, such as ammonia and some of its organic derivatives. In most cases, the amount of incorporated nitrogen corresponded to the carboxyl group content in the substrates. The reactions of coals with the urea appeared more efficient. The yields of the products and their nitrogen contents suggest the chemistry of these reactions involving not only urea itself but also its thermal transformation products.