Enhanced activity and SO2 resistance of Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas. (17th January 2020)

• Record Type: Journal Article
• Authors: Li, Honghu; Zhang, Jingdong; Cao, Yanxiao; Li, Fei; Liu, Chaoyang; Song, Yongwei; Hu, Jiangjun; Wang, Yuan
• Is Part Of: Applied organometallic chemistry. Volume 34:Number 4(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-01-17
• Subjects: flue gas -- mercury oxidation -- Co modified CeO2‐TiO2 -- redox ability -- SO2 resistance; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.5463
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : The Co‐modified CeO2 ‐TiO2 catalyst prepared by facile co‐precipitation was used for efficient elemental mercury oxidation in flue gas. Results indicated that Co doping greatly enhanced the activity and SO2 resistance of the CeO2 ‐TiO2 catalyst. In the presence of 5% O2, 500 ppm NO, 800 ppm SO2 and 3% H2 O at 200 °C, the Hg 0 removal efficiency of CeCo3 /Ti could maintain at about 87% for a relatively long time. Characterizations of catalysts (BET, XRD, Raman spectroscopy, TEM, H2 ‐TPR, O2 ‐TPD, XPS, TG‐MS and SO2 ‐DRIFTS) were carried out to reveal the mechanism of Co modification on the redox ability, SO2 resistance and resultant mercury oxidation removal performance of catalyst. It was found that an interaction of Ce with Co promoted the dispersion of CeO2, increased chemisorbed oxygen concentration, and improved the oxygen storage capacity and the reducibility of catalyst, which was beneficial to the improvement of Hg 0 oxidation removal. Hg 0 would adsorb onto the catalyst and react with surface active oxygen species replenished by gas‐phase O2 to be oxidized via Mars‐Maessen mechanism. SO2 consumed the surface active oxygen species and resulted in the reduction of Ce 4+ to Ce 3+, which induced the deactivation of catalyst. The introduced Co in CeO2 ‐TiO2 catalyst exerted the function of protecting Ce 4+ from being poisoned by SO2 and thus promoted the sulfur resistance and Hg 0 removal performance of the catalyst in the presence of SO2 . Abstract : Co‐modified CeO2 TiO2 catalyst exhibited excellent activity and tolerance to SO2 for Hg 0 oxidation removal. An interaction of Ce with Co greatly improved the redox properties of catalyst. The Introduced Co protected Ce active sites from being poisoned by SO2