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Renewable energy and fuels typically contain nitrogen compounds, which convert to ammonia (NH 3 ) during gasification. Hence, copper-based rare earth composite metal materials were tested for their activity in the selective catalytic oxidation (SCO) of NH 3  with O 2  in simulated biomass gasification stream. This study addresses the oxidation behavior of NH 3  at temperatures between 423 and 723 K by SCO over a Cu-La-Ce composite catalyst that was prepared by coprecipitating copper nitrate, lanthanum nitrate and cerium nitrate at a molar ratio of 6:2:2 and a calcination temperature of 773 K. The catalysts were characterized using cyclic voltammetry (CV), UV-Vis absorption spectra, dynamic light-scattering (DLS), zeta potential, excitationemission fluorescent matrix (EEFM) spectroscopy, X-ray powder diffraction (XRD) and environmental scanning electron microscopy with an energy dispersive X-ray spectrometer (ESEM-EDX). In this report, approximately 98% of the NH 3  was decreased by catalytic oxidation over the Cu-La-Ce composite catalyst. The synergetic interaction between the three metal components played an important role in the elevated activity of the NH 3  catalytic oxidation. In addition, N 2  was the primary product of this NH 3 -SCO process. The CV reversible redox ability may explain the significant activity of the catalysts. The UV-Vis absorption spectra observations indicate that the Cu 2+ -O 2-  species with a peak absorbance value at 230 nm accounted for the higher catalytic performance. The X-ray powder diffraction approach confirmed that copper (II), lanthanum (III) and cerium (IV) oxide active sites were formed on the Cu-La-Ce composite catalyst.

journal of advanced oxidation technologies

Catalytic Performance and Characterization of Copper-based Rare Earth Composite Materials for Selective Catalytic Oxidation Reaction with Simulated Synthetic Ammonia Stream