Research progress on catalytic oxidation technologies of gaseouselemental mercury in flue gases
Journal Title: Energy Environmental Protection - Year 2023, Vol 37, Issue 3
Abstract
Mercury catalytic oxidation technologies in recent studies are summarized in this study to highlight the present research development and future perspective of catalysts. The mercury oxidation catalysts are classified into V-based catalyst, noble metal catalyst and transition metal oxides catalyst. The mercury oxidation efficiency (MOE) of V-based catalyst strongly depends on HCl and Cl_2 concentrations in the flue gas. The noble metal catalyst (e.g., Au, Ag, Pt, Ru and Pd-based) is a promisingmercury oxidation catalyst because of its strong affinity toward mercury atom. The transition metal oxides (Cu, Mn, Fe, Mo, Ag, Pd, Cr, etc.) has also been used to develop low and middle temperature catalysts for Hg^0 oxidation. Most of these catalysts have very high mercury oxidation efficiencies at a certain temperature, but NH_3 and SO_2 in the flue gas seriously suppress the catalyst activity from 94.7%±3.9% and 83.9%±4.8% to 66.8%±16.8% and 57.1%±7.5%, respectively. It is concluded that puremetal oxides serving as single oxidation site would not be suitable mercury oxidation catalysts in the complex flue gas environment. The multicomponent metallic oxide catalysts generate more species oxidation reaction sites for NO reduction and Hg^0, which promotes the possibility of NO and Hg^0 synergic removal. This work also proposes the future challenge of highly efficient Hg0 oxidation catalyst.
Authors and Affiliations
LI Guoliang|School of Energy and Environmental Engineering, University of Science and Technology Beijing, China, YE Kaihang|School of Energy and Environmental Engineering, University of Science and Technology Beijing, China, GENG Mengda|School of Energy and Environmental Engineering, University of Science and Technology Beijing, China, ZHENG Yang|School of Energy and Environmental Engineering, University of Science and Technology Beijing, China, YUE Tao*|School of Energy and Environmental Engineering, University of Science and Technology Beijing, China
Keywords
Related Articles
- EP ID EP737960
- DOI 10.20078/j.eep.20230504
- Views 72
- Downloads 0
Research progress of carbon dioxide capture technology based on enzymatic reaction
At present, coal-fired power plants are still the main source of carbon dioxide (CO_2) emissions in China. The development and transformation of CO_2 capture technologies for coal-fired powerplants is an urgent problem t...
Application progress of machine learning in the whole chain disposal of organic solid waste
A series of complex thermochemical reactions occur in the thermal conversion process of organic solid waste, which brings challenges to the in-depth understanding of its mechanism, the optimization of technical parameter...
Research progresses of noble metal (Pt, Pd, and Ru)-based catalysts for catalytic decomposition of chlorine-containing volatile organic compounds
Chlorine-containing volatile organic compounds (CVOCs) have become a focus and difficulty in the field of catalytic combustion of VOCs due to their extensive sources, high biological/environmental toxicity, and easy inac...
Effects of hydrochar and co-substrate on phenol anaerobic degradation
Anaerobic digestion (AD) is a sustainable biotechnology, which has been applied in the treatment of organic waste. Refractory phenolic compounds, as the main toxic substances in the anaerobic digestion process, usually u...
Applications of photoelectrochemical sensors for the detection of emerging contaminants
In recent years,various emerging contaminants have caused serious threats to the ecological environment,organisms, and human health due to their potential toxicity, which have attracted more and more attention by researc...