Rare Earth Composite Materials for the Reduction of Ammonia in Biomass Gasification. Part 2. Reactivity and Characterization in Selective Catalytic Oxidation Processes

摘要

This study addresses the oxidation of ammonia (NH3) at temperatures between 423 and 673 K by selective catalytic oxidation (SCO) over a copper-based, rare earth composite metal material that was prepared by coprecipitating copper nitrate, lanthanum nitrate and cerium nitrate at various molar ratios. The catalysts were characterized using FTIR and SEM. At a temperature of 673 K and an oxygen content of 4%, around 99% of the NH3 was reduced by catalytic oxidation over the 6:1:3 CuLaCe (molar ratio) catalyst from biomass gasification. N2 was the main product of this NH3-SCO process. Results from the activity and selectivity tests revealed that the optimal catalyst for catalytic performance had the highest possible cerium content. The FTIR spectra confirms the presence of a CuO-like phase and a CeO2 phase on the surface of the CuLaCe ternary catalyst.