HSO was thoroughly assessed as an alternative to CO as pH controller, as it allows for to a much precise dosage control. Catalytic nitrate reduction tests using a Pd-Cu catalyst supported on a carbon black were performed using both Milli-Q grade and real natural drinking waters spiked with NO in batch reactors. Conversion and selectivity results were equivalent to those obtained for CO use, obtaining total NO conversion and final NH selectivity around 30 % for a pH range of 5.5–6 using a 0.05 M HSO solution. Good stability of the catalyst in natural drinking water with the higher salt content studied was observed through reaction cycles, despite the presence of SO in the reaction medium, with total NO conversion after four reaction cycles and final NH concentration of less than 16 mg/L were obtained, making HSO a promising alternative to CO as pH controller in the catalytic NO reduction.

中文翻译：

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硫酸作为饮用水中硝酸盐催化还原 pH 控制剂的评估


HSO 被彻底评估为 CO 的 pH 控制剂替代品，因为它可以实现更精确的剂量控制。使用炭黑负载的 Pd-Cu 催化剂进行催化硝酸盐还原测试，使用 Milli-Q 级水和在间歇式反应器中添加 NO 的真实天然饮用水进行。转化率和选择性结果与使用 CO 获得的结果相当，使用 0.05 M HSO 溶液，在 pH 范围 5.5–6 下获得总 NO 转化率和最终 NH 选择性约为 30%。尽管反应介质中存在SO，但通过反应循环观察到催化剂在所研究的含盐量较高的天然饮用水中具有良好的稳定性，四个反应循环后总NO转化率和最终NH浓度低于16 mg/L的获得，使得 HSO 成为 CO 催化 NO 还原中 pH 控制剂的有前景的替代品。