Abstract A novel TiO 2 -supported vanadium-substituted tungstophosphoric acid (PW 11 V/TiO 2 ) catalyst was designed and applied for selective catalytic reduction of NO x by NH 3 . Compared with the commercial tungstophosphoric acid (PW 12 /TiO 2 ), PW 11 V/TiO 2 displayed a nearly 90% activity improvement at 300 °C. In addition, the favorable resistance and stability to SO 2 were also obtained over PW 11 V/TiO 2 catalyst. Phase analysis and spectroscopy results indicated the vanadium was successfully incorporated into the molecular structure of PW 12 , and the Keggin framework still keep stable over the TiO 2 support. H 2 -TPR test proved the incorporation of vanadium promoted the redox ability of PW 11 V. The present study provides us an effective way to improve the performance of catalytic removal of NO x through tungstophosphoric acid catalyst. Graphic Abstract After introduction of V species, the obtained PW 11 V/TiO 2 catalyst show better NH 3 -SCR performance and N 2 selectivity than PW 12 /TiO 2 catalyst.

中文翻译：

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钒取代是提高磷钨酸氧化还原能力和应用NH3-SCR的有效途径

摘要 设计了一种新型TiO 2 负载钒取代磷钨酸(PW 11 V/TiO 2 )催化剂，用于NH 3 选择性催化还原NO x 。与商业磷酸钨酸 (PW 12 /TiO 2 ) 相比，PW 11 V/TiO 2 在 300 °C 下的活性提高了近 90%。此外，PW 11 V/TiO 2 催化剂也获得了良好的抗SO 2 性能和稳定性。相分析和光谱结果表明钒成功地结合到PW 12 的分子结构中，并且Keggin 骨架在TiO 2 载体上仍然保持稳定。H 2 -TPR 试验证明钒的掺入促进了 PW 11 V 的氧化还原能力。本研究为我们提供了一种有效的方法来提高磷钨酸催化剂催化去除 NO x 的性能。