Production of Copper-Based Rare Earth Composite Metal Materials by Coprecipitation and Applications for Gaseous Ammonia Removal

Figures & data

Figure 1. Dependence of NH3 content on the temperature of the Cu-La-Ce ternary catalyst. Test conditions: 1000 ppm NH₃, 4% O₂, and GHSV = 92,000 hr⁻¹.

Figure 2. BET specific surface area as a function of catalyst metal molar ratio.

Figure 3. FTIR patterns for the various catalysts tested: molar ratios of (a) 6:1:3, (b) 6:2:2, (c) 7:1:2, and (d) 7:2:1.

Figure 4. XRD patterns for the various catalysts tested: molar ratios of (a) 6:1:3, (b) 6:2:2, (c) 7:1:2, and (d) 7:2:1.

Figure 5. UV-Vis absorption spectra for the various catalysts tested.

Figure 6. Cyclic voltammograms of the tested catalysts in a 0.5 M H₂SO₄ electrolyte solution, recorded at a scan rate of 10 mV/sec.

Figure 7. Relationship between NH₃ conversion, N₂ yield, and NO yield at various temperatures using the 6:1:3 Cu-La-Ce catalyst. Test conditions: 1000 ppm NH₃, 4% O₂, 423–673 K, and GHSV = 92,000 hr⁻¹.

Figure 8. SEM photographs showing (a) fresh and (b) used 6:1:3 Cu-La-Ce catalyst. Test conditions: 1000 ppm NH₃, 4% O₂, 673 K, and GHSV = 92,000 hr⁻¹.