52.固定床熱分解における低炭化度炭からのN_2の生成とメカニズム

概要

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Conversion of coal nitrogen to N_2 during the fixed bed pyrolysis of low rank coals increases with increasing temperature in the range of 600〜1200℃, and reaches 65〜70% at 1200℃, but contrarily char nitrogen decreases with temperature. Demineralization by HCl washing drastically suppresses N_2 formation with the corresponding increase in char nitrogen, and removes mainly Fe- and/or Ca-containing species from these coals. The addition of a nanophase iron catalyst promotes N_2 formation from the demineralized coals. These observations show that Fe species inherently present in the ion-exchangeable forms are responsible for the remarkable formation of N_2, and that N_2 arises mostly from iron-catalyzed solid-phase reactions of char nitrogen and precursors.
一般社団法人日本エネルギー学会の論文
1996-10-28