Pd-Based Catalyst on Alumina with Perovskite (La0.67Fe0.83Cu0.17O3) to Reduce Ammonia Content in Natural Gas Exhaust

Significant Reduction of the Formation of N2O and NH3 on an Efficient Three-Way PtRh Catalyst Modified by LaFeCu Perovskite

“…Granger et al found that the formation of NH 3 was reduced over the Rh catalyst on La 0.67 Fe 0.83 Cu 0.17 O 3 perovskite in the exhaust of gasoline vehicles . Very recently, we investigated the formation of NH 3 on x Pd/Al-La 0.67 Fe 0.83 Cu 0.17 O 3 catalysts in simulated exhaust gases from stoichiometric NGVs . We conclude that catalysts containing the perovskite had significantly reduced the amount of NH 3 formed, but its performance was worse for CH 4 and NO conversion.…”

“…24 Very recently, we investigated the formation of NH 3 on xPd/Al-La 0.67 Fe 0.83 Cu 0.17 O 3 catalysts in simulated exhaust gases from stoichiometric NGVs. 9 We conclude that catalysts containing the perovskite had significantly reduced the amount of NH 3 formed, but its performance was worse for CH 4 and NO conversion. Moreover, a large amount of N 2 O was still formed over the catalysts.…”

“…The PtRh/La-Al 2 O 3 catalyst with a noble metal Pt loading of 1.35 wt % and a noble metal Rh loading of 0.15 wt % (Pt:Rh = 9:1) was prepared by the co-impregnation method. PtRh/LaAl was mechanically mixed with La 0.67 Fe 0.83 Cu 0.17 O 3 at a mass ratio of 3:1, and then, the catalyst slurry was coated onto the honeycomb cordierite. Then, the catalysts were dried at 100 °C for 12 h, and the overall catalyst was obtained by calcination at 550 °C for 3 h, which was denoted as PtRh/LaAl-LaFeCu.…”

“…In addition to the impact on the environment, N 2 O and NH 3 also have a greater impact on human health. To control NH 3 emissions from motor vehicle exhaust, the newly released National Phase VI Motor Vehicle Pollutant Emission Standards , and the latest EURO VI regulations , for heavy duty natural gas vehicles (NGVs) have set a limit of 10 ppm for NH 3 formation. N 2 O emissions from vehicles are regulated in the United States and China for light duty vehicles , and will soon be regulated in Europe VII for heavy duty NGVs.…”