The Effects of Temperature and Gas Species on Ammonia Removal in the Simulated Producer Gas of Biomass Gasification by H2-Reduced Titanomagnetite

Abstract

In this study, catalytic removal of NH3 in simulated producer gas from biomass gasification has been experimentally investigated using H2-reduced titanomagnetite (Fe2.9Ti0.1O4) in a lab-scale fluidized bed reactor at temperatures of 500 and 750 °C, respectively. Effects of gaseous species and their combination on the NH3 removal were examined by using seven gas mixtures: (1) Simulated producer gas (H2, CO, CO2, and CH4); (2) H2 in Ar; (3) CO in Ar; (4) CO2 in Ar; (5) CH4 in Ar; (6) H2, CO, and Ar; and (7) H2, CO, CO2, and Ar. In these test gases, the NH3 concentration was 2300 ± 200 ppmv. The experimental results show that temperature has a significant effect on NH3 decomposition in all of the tested gases, and the reduced titanomagnetite had a much higher activity at 750 °C than at 500 °C. In the simulated producer gas, the NH3 decompositions were 28.4 and 94.7% at 500 and 750 °C, respectively. Side reactions including the reverse water–gas shift reaction, the (reverse) Boudouard reaction, the (reverse) ...