Design and Synthesis of Highly-Dispersed WO3 Catalyst with Highly Effective NH3–SCR Activity for NOx Abatement

The development of high-efficiency catalysts, especially for selective catalytic reduction of NOx with NH3 (NH3–SCR) catalysts, with outstanding low-temperature catalytic reactivity and impressive lifetime remains a great challenge in the field of eliminating vehicle engine exhausts. Herein, we present a novel gas-bubbling-assisted dispersed hybrid nanocrystal-assisted hydrothermal deposition (GBD-HNHD) strategy to fabricate a W@CeZrAlOx catalyst with highly dispersed WO3 nanocrystals (10 wt %) (W@CZA-HNHD). Compared with the W/CeZrAlOx catalyst prepared with the impregnation method (W@CZA-IM), W@CZA-HNHD not only exhibits highly effective low-temperature deNOx activity (the light-off temperature being lowered 45 °C) but also shows an exceptional stability (100 h time-on-stream testing with seven measurement cycles) and long lifetime (compares well with 135 000 miles). This work not only provides a new route to prepare an advanced catalyst with high loading isolated active sites but also lays a foundation for optimizing the utilization efficiency of the catalytically active species in the practical applications.