期刊
ACS CATALYSIS
卷 9, 期 12, 页码 11557-11562出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b03503
关键词
tungsten; high density; high dispersion; selective catalytic reduction; NOx abatement
资金
- National Natural Science Foundation of China [21802099]
- National Key Research and Development Program of China [2016YFC0204901]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2017A06]
- Sichuan Science and Technology Program [2018GZ0401]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division
- China Scholarship Council
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 nano crystal-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 deNO(x) activity (the light-off temperature being lowered 45 degrees 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.
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