Unravelling the impacts of sulfur dioxide on dioxin catalytic decomposition on V2O5/AC catalysts

Yatao Yang; Yaqin Hou; Xiaoxiao Ding; Jie Tian; Yifan Li; Zequan Zeng; Jiancheng Wang; Zhanggen Huang

doi:10.1016/j.scitotenv.2023.166462

Unravelling the impacts of sulfur dioxide on dioxin catalytic decomposition on V₂O₅/AC catalysts

Sci Total Environ. 2023 Nov 25:901:166462. doi: 10.1016/j.scitotenv.2023.166462. Epub 2023 Aug 21.

Authors

Yatao Yang¹, Yaqin Hou², Xiaoxiao Ding¹, Jie Tian¹, Yifan Li¹, Zequan Zeng³, Jiancheng Wang⁴, Zhanggen Huang⁵

Affiliations

¹ State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
² State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: houyaqin@sxicc.ac.cn.
³ State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China.
⁴ State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Taiyuan 030024, PR China.
⁵ State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China; Dalian National Laboratory for Clean Energy, Dalian 116023, PR China. Electronic address: zghuang@sxicc.ac.cn.

PMID: 37611722
DOI: 10.1016/j.scitotenv.2023.166462

Abstract

Dioxins are high chlorine, toxic, and persistent organic pollutants that exert significant pressure on both human and the environment. From the analysis of current pollutant removal of the whole life cycle, such as integrated removal of NOx, SO₂ and dioxins in a system, the dioxins oxidation activity as well as the distribution of oxidation products in the presence of SO₂ are still a challenge. In this study, dibenzofuran (DBF) was regarded as a model dioxin compound, and V₂O₅/AC was used as a catalyst to investigate the impact of SO₂ on degradation activity and the degradation path of DBF. Various characterization results showed that SO₂ could promote the transformation of DBF to intermediates through a reaction with lattice oxygen and lower the apparent activated energy of DBF catalytic oxidation on V₂O₅/AC catalysts. The density functional theory (DFT) calculations confirmed that SO₂ improved the oxidation ability of lattice oxygen on V₂O₅/AC. The ethyl hydrogen fumarate intermediate decreased and the small-molecule byproducts increased, providing further evidence that SO₂ accelerates the degradation of DBF and its intermediates. However, the formation of VOSO₄ would inevitably deteriorate the adsorption and oxidation abilities of V₂O₅/AC. A model is pioneered to describe the relationship between SO₂ promotion and VOSO₄ inhibition on DBF catalytic oxidation on a V₂O₅/AC catalyst. This study is expected to provide theoretical guidance for the collaborative abatement of multi-pollutants in flue gas.

Keywords: Byproducts distribution; Catalytic oxidation; Dioxins; SO(2); V(2)O(5)/AC.