Facultad de Ciencias, Universidad Autónoma de Madrid, C/Tomás y Valiente, 28049, Madrid, Spain.
Abengoa, Centro I+D+I Prolongación C/Don Remondo, s/n Barriada de Fuente del Rey, 41073, Dos Hermanas, Sevilla, Spain.
Environ Sci Pollut Res Int. 2020 Sep;27(26):33181-33191. doi: 10.1007/s11356-020-09459-9. Epub 2020 Jun 11.
This work presents a novel catalyst preparation method and the optimization of operation conditions for an effective NO conversion with a high selectivity and stability that guarantee water quality for human consumption. Catalytic reduction of NO and NO was carried out with Pd supported on InO under mild operation conditions (25 °C, 1 atm) with H and CO as reducing and acidifying agents, respectively. The catalyst was used in batch experiments showing the suppression of NO accumulation and low NH selectivity at acid pH. Long-term experiments were carried out with Pd on γ-AlO spheres covered with InO. This catalyst presented a high stability during more than 700 h. A concentration of NO below 50 mg/L was achieved, producing less than 0.5 mg/L of NH as reaction by-product by a strict limitation of the H fed and controlling several operating conditions.
本工作提出了一种新型催化剂制备方法，并对操作条件进行了优化，以实现高效、高选择性和高稳定性的 NO 转化，从而保证人类消费用水的水质。在温和的操作条件（25°C，1 大气压）下，采用 InO 负载的 Pd 作为催化剂，分别以 H 和 CO 作为还原和酸化试剂，进行了 NO 和 NO 的催化还原反应。该催化剂在批量实验中表现出抑制 NO 积累和在酸性 pH 下低 NH 选择性的特性。在γ-AlO 球体上覆盖 InO 的 Pd 催化剂进行了长期实验。该催化剂在超过 700 小时的时间内表现出高稳定性。通过严格限制进料 H 的浓度并控制多个操作条件，可以将 NO 的浓度降低到 50 mg/L 以下，同时产生的 NH 副产物反应产物小于 0.5 mg/L。
