Experimental study on Denitrification and in-situ reduction of NO with Fe2O3 catalyst during coke combustion

ABSTRACT

Fe₂O₃, as a cheap and readily available metal catalyst, can effectively reduce the emission of polluting gases in the combustion process, which is an encouraging way to realize the clean utilization of coke. This work focuses on the effect of Fe₂O₃ in denitration (deNO_X) and in-situ reduction of NO during civil clean coke combustion. The influence of catalyst addition and temperature on char-N migration was discussed. Results showed that the catalytic reduction activity is the best when the addition amount is 3%. The reaction is accelerated and the NO emission time is shortened with an increase of combustion temperature, which is mainly due to the enhanced promotion of Fe₂O₃. Fe reacted with NO, further reducing its releasing amount. Furthermore, char has more significant effects on the reduction of NO in the presence of CO and Fe₂O₃, up to 90%. Thus, the effect of Fe₂O₃ on reaction paths is determined. The reduction effect of Fe₂O₃ on NO was mainly due to the formation of reduced Fe⁰ during the pyrolysis process. This study can provide some theoretical guidance for the pollution control of loose coal combustion in rural areas.

KEYWORDS:

• Fe₂O₃
• coke
• catalytic combustion
• NO

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been republished with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by National Natural Science Foundation of China (21878210), the National Natural Science Foundation of China (51905496, 22169017), the Shanxi Provincial Science and Technology Achievement Transformation Guidence Special Program of China (202104021301052).