Catalytic reduction of nitrate with Pd-In2O3
2020
Pizarro, Alejandro Herrero | Torija, Irene | Moreno, Reyes | Arauzo, Jesús | Monsalvo, Victor M.
This work presents a novel catalyst preparation method and the optimization of operation conditions for an effective NO₃⁻ conversion with a high selectivity and stability that guarantee water quality for human consumption. Catalytic reduction of NO₃⁻ and NO₂⁻ was carried out with Pd supported on In₂O₃ under mild operation conditions (25 °C, 1 atm) with H₂ and CO₂ as reducing and acidifying agents, respectively. The catalyst was used in batch experiments showing the suppression of NO₂⁻ accumulation and low NH₄⁺ selectivity at acid pH. Long-term experiments were carried out with Pd on γ-Al₂O₃ spheres covered with In₂O₃. This catalyst presented a high stability during more than 700 h. A concentration of NO₃⁻ below 50 mg/L was achieved, producing less than 0.5 mg/L of NH₄⁺ as reaction by-product by a strict limitation of the H₂ fed and controlling several operating conditions.
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