Experimental and Kinetic Study at High Temperatures of the NO Reduction over Eucalyptus Char Produced at Different Heating Rates

Abstract

The NO reduction process over eucalyptus char has been studied in a laboratory-scale quartz reactor. Experiments were performed with char obtained from the pyrolysis of eucalyptus at a low heating rate (LHR) and high heating rate (HHR) and a final temperature of 900 °C. The LHR char sample was prepared in a fixed-bed reactor using a pyrolysis heating rate of 10 °C min−1, while a fluidized-bed reactor was employed to obtain chars at a HHR. The parameters considered in the study of the char/NO interaction comprise the inlet NO concentration, temperature, and pyrolysis heating rate. The inlet NO concentration was varied, ranging from 300 to 1100 ppm at a temperature of 900 °C. To analyze the temperature influence, char/NO interaction tests were also performed in the 750−900 °C temperature range for a given NO concentration of 900 ppm. It has been found that the NO reduction ability is significant for the eucalyptus chars considered, showing that temperature has a marked effect on the NO reduction process. Re...