期刊
CHEMICAL ENGINEERING RESEARCH & DESIGN
卷 94, 期 -, 页码 648-659出版社
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.cherd.2014.10.006
关键词
NH3-SCR; Ce0.65Zr0.35O2; WO3; Catalyst; Monolith
资金
- National Natural Science Foundation of China [21173153, 20803049]
- National High Technology Research and Development Program of China (863 Program) [2013AA065304]
The carrier material Ce0.65Zr0.35O2 was prepared by the co-precipitation method and a series of Ce0.65Zr0.35O2-based monolith catalysts containing W, Fe or Cu were prepared for selective catalytic reduction (SCR) of NOx with NH3. The catalysts were characterized by ammonia oxidation, N2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and NH3 temperature-programmed desorption (NH3-TPD). Catalytic activity tests reveal that catalyst WO3/Ce0.65Zr0.35O2 has the best catalytic activity and a good resistance to hydrothermal aging. It is light-off at 200 degrees C and has the highest NOx conversion of 96% at 350 degrees C. The reaction window of 80% NOx conversion is in the temperature range of 241-457 degrees C with a gas hourly space velocity (GHSV) of 30,000 h(-1). Moreover, it has a good SO2 tolerance and good ability to fit the high GHSV, which suggests that it has a good prospect for real application. Characterization experiments show that WO3/Ce0.65Zr0.35O2 has a weaker property of ammonia oxidation, a larger surface area, strong oxidation property with the highest binding energy of Ce, Zr and O, and the most surface medium-strength acid. These characteristics are the main factors that lead to the increased SCR activity. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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