Char structural evolution characteristics and its correlation with reactivity during the heterogeneous NO reduction in a micro fluidized bed reaction analyzer: The influence of reaction atmosphere

Abstract

Experiments were conducted on chars prepared from R- and H- form sawdust (SD) and Shenmu coal (SM) to investigate NO reduction in different atmospheres, and physicochemical structures of chars after the reaction were analyzed. The effects of atmospheres on NO reduction reactivities and structural evolution characteristics of different chars were discussed. The NO reduction reactivity of SD chars was always better than that of SM chars, and there were some differences in the specific reactivity of four chars under different atmospheres. When NO, CO2 and O2 were sequentially involved, the char ordering degree tended to increase, which also had a clear positive impact on the pore development. With the participation of CO2 and O2 in the reaction, some N-6 and N-X in R SD char were converted into N-5 and N-Q, while N-6, N-5 and N-X in the other three chars were converted into N-Q.