期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 52, 期 20, 页码 11769-11777出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b03732
关键词
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资金
- Key Project of National Natural Science Foundation [21637005]
- National Natural Science Foundation of China [21777174, 51822811]
- National Key R&D Program of China [2017YFC0211105]
CeO2-WO3-ZrO2 mixed oxides were prepared by the homogeneous precipitation method for the selective catalytic reduction of NOx with NH3 (NH3-SCR). The effects of hydrothermal aging on the catalytic performances of CeO2-WO3-ZrO2 were investigated. The results showed that CeO2-WO3-ZrO2 catalyst exhibited excellent NH3-SCR activity for removal of NOx and hydrothermal stability. After hydrothermal aging at 850 degrees C for 16 h, the optimum CeO2-WO3-ZrO2 catalyst could still realize 80% NOx conversion at 300-500 degrees C even under a high gas hourly space velocity of 250 000 h(-1). The structural properties, redox ability, surface species, and acidity of fresh and hydrothermally aged CeO2-WO3-ZrO2 catalysts were characterized by N-2-physisorption, XRD, Raman, H-2-TPR, XPS, NH3-TPD, and in situ DRIFTS. The characterization results showed that decreases of 89% of the surface area and 71% of the NH3 storage capacity as well as new phase formation occurred for the CeO2-WO3-ZrO2 sample after hydrothermal aging at 850 degrees C for 16 h. The activity of hydrothermally aged CeO2-WO3-ZrO2 was mainly attributed to the retention of redox-acid sites and their interaction due to the formation of Ce-Zr solid solutions and Ce4W9O33.
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