Work

Mercury Adsorption/Oxidation Mechanisms on Fly Ash Under N2 Atmosphere

Year: 2025

Type: article

Abstract: Mercury adsorption/oxidation plays a crucial role in mercury transformation during coal combustion. To gain an intuitive understanding of the adsorption/oxidation mechanisms between mercury and fly ash, changes in mercury speciation of fly ash before and after Hg adsorption were investigated using temperature-programmed decomposition–atomic fluorescence spectroscopy (TPD-AFS). The results directly reveal that the primary adsorption/oxidation mechanism between mercury and fly ash is the heterogeneous oxidation reaction of Hg0 to HgCl2. The mercury adsorption capacity exhibits a strong positive correlation with both the unburned carbon (UBC) content and the specific surface area (SSA) of the fly ash, whereas the presence of metal oxides has a negligible effect on mercury adsorption. Higher inlet concentrations of Hg0 enhance mercury adsorption, while flue gas components such as N2, O2, and CO2 have minimal influence on mercury adsorption.

Source: Processes

DOI: 10.3390/pr13123830

Authors: Libing Gao, Yuanzhi Lei, Jianghao Wang, Hongyan Li, Lijuan Huo, Yiping Wang, Shaoqing Guo

Institutions: Taiyuan University of Science and Technology, Tianjin University

Language: English

Topic: Mercury impact and mitigation studies

Subfield: Health, Toxicology and Mutagenesis

Field: Environmental Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,896

Funders: National Natural Science Foundation of China, Tianjin University