Catalytic wet air oxidation of ammonia over supported noble metals

Manipulating catalytic activity and durability of Pt-modified Cu–Fe–La/γ-Al2O3 ternary catalyst for catalytic wet air oxidation: effect of calcination temperature

“…Pt has been proven to be intrinsically more active than Ru in Pt and Ru supported on TiO 2Àx wt% CeO 2 for CWAO of phenol due to high OSC values and the presence of Lewis acid sites. 24 Lousteau et al 25 investigated the different noble metals enhanced the activity in the CWAO of ammonia in this descending order: Pt > Pd > Ir > Ru > Rh. The oxygen coverage on surface of the Pt-based catalysts plays a signicant role on both the activity and the selectivity.…”

Catalytic Wet Air Oxidation Using Supported Pt and Ru Catalysts for Treatment of Distillery Wastewater (Cognac and Sugarcane Vinasses)

“…In our previous work [44], the CWAO of aqueous solutions of melanoidin (TN0 = 20 mmol L -1 ) under similar reaction conditions yielded a selectivity to N2 over 80% over the same Ru/TiO2 catalyst. The differences in the selectivity observed can be explained in part by the high oxygen coverage at the catalyst surface that was the crucial factor for the selectivity, as demonstrated for ammonia oxidation [47]. A high amount of catalyst (500 mg 3% Ru/TiO2) and a low concentration of ammonium (<1.7 mmol L -1 ) are unfavorable conditions for a good selectivity to N2.…”

Catalytic wet air oxidation of phenol over metal catalyst (Ru,Pt) supported on TiO2–CeO2 oxides

“…For heterogeneous transition metal oxides, partial leaching of metal ions has been observed during the reaction, and a recovery step is necessary. Noble metal catalysts have proved their effectiveness for the CWAO of a wide range of pollutants, including carboxylic acids [5,6], phenol [7][8][9][10], and nitrogen compounds [11][12][13]. Thus, noble metals are still being used, despite their high price, because they show higher catalytic activity and high resistance to metal leaching.…”