Name : The 37th Conference of Coal Science
Number : 37
Location : [in Japanese]
Date : September 28, 2000 - September 29, 2000
Pages 417-420
The objective of this work is to develop a novel hot gas cleanup method to remove ammonia from coal gasification products with inexpensive raw materials. The catalytic decomposition of 2000ppm NH_3 has been examined with a fixed bed quartz reactor. The Fe-or CaO-containing composites, prepared by carbonizing metal loaded brown coals, catalyze the present reaction and achieve complete decomposition of NH_3 at 750-850℃. Further, the perfect removal of NH_3 at 850℃ by use of a brown coal char with small amounts of inherent Fe and Ca is noteworthy in particular from a practical point of view. The mechanisms of the Fe- and Ca-catalyzed decomposition are discussed in term of formation of nitride intermediates.
