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首页> 外文期刊>Separation and Purification Technology >A sustainable environmentally friendly NO_x removal process using Ag(II)/Ag(I)-mediated electrochemical oxidation
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A sustainable environmentally friendly NO_x removal process using Ag(II)/Ag(I)-mediated electrochemical oxidation

机译：使用Ag（II）/ Ag（I）介导的电化学氧化进行可持续的环保NO_x去除工艺

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This paper presents the results of investigations related to the development of a mediated electrochemical oxidation (MEO) process-based wet scrubbing method for NO and NO2 abatement from a simulated NO-air flue gas mixture. The Ag(U) redox mediator in nitric acid medium generated in an electrochemical cell was circulated continuously through a packed-bed column by a closed loop, and the NO_x gas was oxidatively removed by absorption/oxidation. The outlet gas from scrubber-I was subsequently admitted into scrubber-Il for further continuous washings by 3 mol L~(-1) HNO3. Numerous experimental runs were carried out in order to observe the performance of the wet scrubber-electrochemical cell integrated system as a function of the operating conditions: the initial NO concentration in the feed (100-400 mg L~(-1)), gas flow rate (0.061-0.243 m s~(-1)), liquid flow rate (0.012-0.049 m s~(-1)), concentration of silver ion mediator (0,01-0.1 mol L~(-1) ), nitric acid concentration (3-6 mol L~(-1)), and the temperature (15-45 °C). Low initial NO feed, low gas flow rates, high liquid flow rates, high HNO3 acid concentration, Ag(I) concentration as low as 0.05 mol L~(-1) and low temperatures were most suitable for high removal performance. Total removal (100%) of NO and 80% removal of NO_x were achieved in the oxidation with electrogenerated Ag(II) in a single stage gas scrubbing in scrubber-I. But, interestingly, a second stage gas scrubbing by a simple HNO3 (3 mol L~(-1)) wash in scrubber-II led to a better removal of NO_x with overall efficiency reaching 90% as well. This is an alternative green treatment process for zero emission of waste gases. Some NO_x removal studies were also performed using Ce(lV)/Ce(III) redox mediator system, and the effect of nitric acid concentration and temperature examined, for a comparison with Ag(II)/Ag(I).
机译：本文介绍了与基于介导的电化学氧化（MEO）工艺的湿法洗涤技术发展有关的研究结果，该方法用于从模拟的NO-空气烟道气混合物中减少NO和NO2。在电化学电池中生成的硝酸介质中的Ag（U）氧化还原介体通过闭环连续循环通过填充床塔，并通过吸收/氧化氧化除去NO_x气体。随后将来自洗涤器-1的出口气体进入洗涤器-11中，以用3mol L〜（-1）HNO 3进一步连续洗涤。为了观察湿式洗涤器-电化学池集成系统的性能随操作条件的变化进行了许多实验运行：进料中的初始NO浓度（100-400 mg L〜（-1）），气体流速（0.061-0.243 ms〜（-1）），液体流速（0.012-0.049 ms〜（-1）），银离子介体浓度（0.01-0.1 mol L〜（-1）），硝酸酸浓度（3-6 mol L〜（-1））和温度（15-45°C）。低初始NO进料，低气体流量，高液体流量，高HNO3酸浓度，低至0.05 mol L〜（-1）的Ag（I）浓度和低温最适合高去除性能。在洗涤器-I的单级气体洗涤中，在用电生成的Ag（II）进行的氧化中，实现了NO的总去除（100％）和NO_x的80％去除。但是，有趣的是，通过在洗涤塔II中进行简单的HNO3（3 mol L〜（-1））洗涤进行第二阶段的气体洗涤可以更好地去除NO_x，总效率也达到90％。这是用于零废气排放的替代绿色处理工艺。还使用Ce（IV）/ Ce（III）氧化还原介体系统进行了一些NO_x去除研究，并研究了硝酸浓度和温度的影响，以便与Ag（II）/ Ag（I）进行比较。

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