Promotional effect of antimony on the selective catalytic reduction NO with NH3 over V-Sb/Ti catalyst. Issue 19 (24th August 2019)

• Record Type: Journal Article
• Authors: Kwon, Dong Wook; Kim, Dong Ho; Hong, Sung Chang
• Is Part Of: Environmental technology. Volume 40:Issue 19(2019)
• Page Start: 2577
• Page End: 2587
• Publication Date: 2019-08-24
• Subjects: Antimony -- SbOx -- SO2 resistance -- NH3-SCR -- NOx removal -- vanadium; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2018.1491632
• Languages: English
• ISSNs: 0959-3330

Abstract

ABSTRACT: 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 H2 -temperature programmed reduction (H2 -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 NH3 adsorption characteristics did not affect the catalytic efficiency. The Sb 5+ fraction was highest for V-2.0Sb/Ti and exhibited a positive correlation with the V 4+ fraction. This phenomenon is related to the effect of synergistic between vanadium and antimony, promoting the conversion of V 5+ to V 4+ by Sb 5+ . Increasing the V 4+ 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 NO x conversion and SO2 durability. GRAPHICAL ABSTRACT: