Enhancement of Oxidation Efficiency of Elemental Mercury by CeO2/TiO2 at Low Temperatures Governed by Different Mechanisms.

ABSTRACT: This study aims to investigate the photothermal oxidation removal of Hg0 in simulated flue gases using photothermal catalysts at relatively low temperatures of 120-160 °C in two phases: the first phase applied the sol-gel method to prepare TiO2 and CeO2/TiO2 photothermal catalysts and characterized surface properties by specific surface area analysis, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and photoluminescence spectroscopy. The second phase investigated the effects of operating parameters on Hg0 oxidation efficiency at lower temperatures of 100-160 °C. The operating parameters included reaction temperatures and modified concentrations of CeO2. Experimental results indicated that TiO2 prepared by the sol-gel method was mainly in the anatase phase. XPS analysis showed that Ce mostly existed in the form of Ce4+. The content of surface-chemisorbed oxygen increased with the modification amount of CeO2. Photothermal catalytic oxidation results indicated that CeO2/TiO2 had a much higher oxidation efficiency of Hg0 at 120-160 °C than neat TiO2, which increased from 30-60 to >90%. 7%CeO2/TiO2 not only had the best photothermal performance but also maintained high efficiency at a relatively higher reaction temperature of 160 °C.

SUBMITTER: Shen H 

PROVIDER: S-EPMC7003208 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature