The development of efficient technologies for the synergistic catalytic elimination of NO_x and chlorinated volatile organic compounds (CVOCs) remains challenging. Chlorine species from CVOCs are prone to catalyst poisoning, which increases the degradation temperature of CVOCs and fails to balance the selective catalytic reduction of NO_x with the NH₃ (NH₃–SCR) performance. Herein, synergistic catalytic elimination of NO_x and chlorobenzene has been originally demonstrated by using phosphotungstic acid (HPW) as a dechlorination agent to collaborate with CeO₂. The conversion of chlorobenzene was over 80% at 270 °C, and the NO_x conversion and N₂ selectivity reached over 95% at 270–420 °C. HPW not only allowed chlorine species to leave as inorganic chlorine but also enhanced the Bro̷nsted acidity of CeO₂. The NH₄⁺ produced in the NH₃–SCR process can effectively promote the dechlorination of chlorobenzene at low temperatures. HPW remained structurally stable in the synergistic reaction, resulting in good water resistance and long-term stability. This work provides a cheaper and more environmentally friendly strategy to address chlorine poisoning in the synergistic reaction and offers new guidance for multipollutant control.

中文翻译：

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磷钨酸作为脱氯剂与 CeO2 协同催化消除 NOx 和氯苯

开发协同催化消除氮_氧化物和氯化挥发性有机化合物 (CVOC) 的高效技术仍然具有挑战性。 CVOCs中的氯物种容易引起催化剂中毒，这会增加CVOCs的降解温度，并且无法平衡NO _x的选择性催化还原与NH ₃ (NH ₃ –SCR)性能。在此，最初通过使用磷钨酸(HPW)作为脱氯剂与CeO ₂协同催化消除NO _x和氯苯。氯苯在270 ℃时的转化率超过80%，NO _x转化率和N ₂选择性在270~420 ℃时达到95%以上。 HPW 不仅使氯物质以无机氯的形式离开，而且还增强了 CeO ₂的布朗斯台德酸度。NH ₃ –SCR工艺中产生的NH ₄ ⁺可以有效促进氯苯的低温脱氯。 HPW在协同反应中保持结构稳定，从而具有良好的耐水性和长期稳定性。这项工作提供了一种更便宜、更环保的策略来解决协同反应中的氯中毒，并为多污染物控制提供了新的指导。