Kwon Dong Wook, Kim Dong Ho, Hong Sung Chang
a Materials Architecturing Research Center, Korea Institute of Science and Technology , Seoul , Republic of Korea.
b Department of Environmental Energy Engineering, Graduate School of Kyonggi University , Gyeonggi-do , Republic of Korea.
Environ Technol. 2019 Aug;40(19):2577-2587. doi: 10.1080/09593330.2018.1491632. Epub 2018 Jul 4.
The effect of antimony on the selective catalytic reduction (SCR) performance and SO 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), NH/SO-temperature programmed desorption (TPD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs), X-ray photoelectron spectroscopy (XPS), and H-temperature programmed reduction (H-TPR). The V-Sb/Ti catalyst showed excellent activity in the range 200-300°C (compared with V/Ti), with an optimum achieved for 2 wt.% antimony. The total amount of acidic sites and NH adsorption characteristics did not affect the catalytic efficiency. The Sb fraction was highest for V-2.0Sb/Ti and exhibited a positive correlation with the V fraction. This phenomenon is related to the effect of synergistic between vanadium and antimony, promoting the conversion of V to V by Sb. Increasing the V 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 SO onto the V-Sb/Ti catalyst surface, improving the resistance to this gas. Therefore, the addition of antimony to V/Ti improved NO conversion and SO durability.
研究了锑对V-Sb/Ti选择性催化还原（SCR）性能及抗SO₂ 耐久性的影响。采用多种技术对催化剂的物理化学特性进行了表征，包括布鲁诺尔-埃米特-泰勒（BET）表面积分析、X射线衍射（XRD）、NH₃/SO₂程序升温脱附（TPD）、漫反射红外傅里叶变换光谱（DRIFTs）、X射线光电子能谱（XPS）以及H₂程序升温还原（H₂-TPR）。V-Sb/Ti催化剂在200-300°C范围内表现出优异的活性（与V/Ti相比），锑含量为2 wt.%时达到最佳效果。酸性位点的总量和NH₃吸附特性不影响催化效率。V-2.0Sb/Ti中Sb的含量最高，且与V的含量呈正相关。这种现象与钒和锑之间的协同作用有关，即锑促进V⁴⁺向V⁵⁺的转化。增加V-Sb/Ti中V的含量会提高催化活性，这主要归因于锑的添加增强了催化剂的再氧化能力。此外，锑的添加延迟了SO₂在V-Sb/Ti催化剂表面的吸附，提高了对这种气体的抗性。因此，向V/Ti中添加锑提高了NO转化率和抗SO₂耐久性。
