期刊
ENVIRONMENTAL TECHNOLOGY
卷 40, 期 19, 页码 2577-2587出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2018.1491632
关键词
Antimony; SbOx; SO2 resistance; NH3-SCR; NOx removal; vanadium
资金
- CEFV (Center for Environmentally Friendly Vehicle) as Technologies related to eco-friendly cars and green vehicles of Global Top Environmental Technology Development in KEITI (Korea Environmental Industry Technology Institute) of KMOE (Ministry of Enviro [2016 0020 80004]
The effect of antimony on the selective catalytic reduction (SCR) performance and SO2 durability of V-Sb/Ti was investigated. The physicochemical characteristics of catalyst were characterized by various techniques, including Brunauer-Emmett-Teller (BET) surface area analysis, X-ray diffraction (XRD), NH3/SO2-temperature programmed desorption (TPD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), X-ray photoelectron spectroscopy (XPS), and H-2-temperature programmed reduction (H-2-TPR). The V-Sb/Ti catalyst showed excellent activity in the range 200-300 degrees C (compared with V/Ti), with an optimum achieved for 2 wt.% antimony. The total amount of acidic sites and NH3 adsorption characteristics did not affect the catalytic efficiency. The Sb5+ fraction was highest for V-2.0Sb/Ti and exhibited a positive correlation with the V4+ fraction. This phenomenon is related to the effect of synergistic between vanadium and antimony, promoting the conversion of V5+ to V4+ by Sb5+. Increasing the V4+ fraction in V-Sb/Ti increased the catalytic activity, which was mainly attributed to enhanced catalyst re-oxidation capability due to the addition of antimony. Furthermore, the addition of antimony delayed the adsorption of SO2 onto the V-Sb/Ti catalyst surface, improving the resistance to this gas. Therefore, the addition of antimony to V/Ti improved NOx conversion and SO2 durability. [GRAPHICS]
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