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.
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