Experimental study of NO reduction over biomass char

Kinetics investigation on the reduction of NO using straw char based on physicochemical characterization

“…The previous results of Yin et al (2009) obtained an optimal char-preparation temperature of 973 K with the largest surface area for the phenol-formaldehyde resin. Dong et al (2007) also found an optimal biomass preparation temperature in the range of 1073-1253 K, with the specific surface area of biomass char prepared at 1073 K greater than that of char prepared at higher temperatures.…”

“…The phenol-formaldehyde resin char prepared at 973 K showed the best reactivity of NO reduction although there was little difference among the reactivity of the char prepared at 773, 873 and 1073 K. However, the results of Dong et al (2007) indicated the reactivity of NO reduction using biomass char decreased with the char-preparation temperature.…”

“…However, previous results have shown that there are still some obvious differences in the physicochemical characteristics and the reactivity of NO with biomass char and coal char (Dong et al, 2009b;Sahu et al, 2010;Vassilev et al, 2010;Wang et al, 2010a;Yin et al, 2009). Dong et al (2007Dong et al ( , 2009a determined the kinetics parameters for the reaction of NO and char in a fixed bed at 973-1173 K, which proposed the reaction order and the apparent activation energy to be, for straw-char, 0.66 and 114.40 kJ mol À1 , respectively, and for coal-char, 0.76 and 94.79 kJ mol À1 , respectively. However, the results of Garijo et al (2003) on the reaction of NO and biomass char indicated that the reaction order and the apparent activation energy were 0.45 and 92.22 kJ mol À1 , respectively, for straw-char and 0.3 and 77.37 kJ mol À1 , respectively, for wood-char.…”

“…However, there are a number of studies indicating that the heterogeneous reduction of NO using biomass char is also noteworthy (Dong et al, 2007(Dong et al, , 2009aGarijo et al, 2003;Lin et al, 2010;Sun et al, 2009;Yin et al, 2009).…”

Fuel-N Evolution during the Pyrolysis of Industrial Biomass Wastes with High Nitrogen Content

“…Nitrogen in coal mainly exists in heteroaromatic ring systems as pyrrolic and pyridinic N, while nitrogen in biomass mainly exists as proteins (and amino acids) together with some other forms such as DNA, RNA, alkaloids, porphyrin, and chlorophyll [13,14]. Moreover, some biomass fuels produce more NOx than coal on the basis of the heating value [15], especially for those typical industrial biomass wastes with high nitrogen content mentioned above. Owing to the differences of nitrogen amount and nitrogen functionalities between biomass and coal, those results for coal pyrolysis are not completely suitable to illustrate the behavior of nitrogen during the pyrolysis of biomass.…”