Abstract Photocatalytic selective catalytic reduction of nitrogen oxides (NOx SCR) is a green and effective method to eliminate NOx. But the natural sunlight-driven NOx SCR is not realized due to the low temperature under sparse sunlight irradiation and the lack of highly active catalysts. To solve those problems, we selected a commercial AlNx film which can heat the catalysts to 270 °C just under one standard solar irradiation because of its full sunlight absorption and low radiation characteristics, enabling to onset NOx SCR. Further, a polyvinyl alcohol assisted graphene oxides templated method was developed to synthesize the W doped Fe2O3 nanosheets on a large scale, which can be used as efficient NOx SCR catalysts with high N2 selectivity, excellent SO2 and H2O resistances. As a result, the AlNx assisted W doped Fe2O3 nanosheets showed 92% and 90% NO conversion rate under one solar irradiation and outdoor sunlight irradiation respectively without second energy input, first time of realizing natural sunlight-driven photothermal NOx SCR. This strategy demonstrates a great potential on second energy free industrialized NOx SCR.

中文翻译：

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AlNx辅助W掺杂Fe2O3纳米片实现高效自然光驱动光热选择性催化还原氮氧化物

摘要 光催化选择性催化还原氮氧化物(NOx SCR)是一种绿色有效的NOx去除方法。但由于阳光稀少照射下温度低且缺乏高活性催化剂，自然阳光驱动的NOx SCR未能实现。为了解决这些问题，我们选择了一种商用 AlNx 薄膜，由于其完全吸收阳光和低辐射的特性，可以在一次标准太阳辐射下将催化剂加热至 270°C，从而启动 NOx SCR。此外，还开发了聚乙烯醇辅助氧化石墨烯模板化方法来大规模合成 W 掺杂的 Fe2O3 纳米片，该纳米片可用作高效的 NOx SCR 催化剂，具有高 N2 选择性、优异的 SO2 和 H2O 耐受性。因此，AlNx 辅助 W 掺杂的 Fe2O3 纳米片在没有二次能量输入的情况下，在一次太阳光照射和室外太阳光照射下分别表现出 92% 和 90% 的 NO 转化率，首次实现了自然阳光驱动的光热 NOx SCR。该策略展示了二次无能源工业化 NOx SCR 的巨大潜力。