Article
Engineering, Environmental
Bo Xu, Wan-Yuan Shi, Wan Sun, Liang-Ming Pan
Summary: This study proposes the use of CuCl2 to regulate the Hg0 chemisorption capacity of FeOCl, improving its efficiency and adaptability for mercury removal in complex flue gas environments.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Chang Wang, Qianqian Hong, Chen Ma, Jian Mei, Shijian Yang
Summary: The study showed that sulfuration improved the chemical adsorption and oxidation rates of Hg-0 on the V2O5-MoO3/TiO2 catalyst, enhancing its capability for Hg-0 removal and resistance to SO2 and H2O. Sulfureted V2O5-MoO3/TiO2 exhibited excellent performance in recovering Hg-0 from coal-fired power plants, which can then be converted to liquid Hg.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Energy & Fuels
Yue Cao, Fuyu Wang, Qinlei Peng, Chuanmin Chen, Songtao Liu, Wenbo Jia, Runlong Hao
Summary: Copper modified attapulgite (Cu3-ATP) catalyst can synergistically oxidize NH3 and Hg0, despite competition between the two reactions. Hg0 oxidation is sulfur resistant in the presence of HCl, but NH3 oxidation is partially inhibited after adding SO2.
Article
Engineering, Chemical
Runxian Wang, Yaolin Wang, Xin Liu, Haining Wang, Dong Ye
Summary: In this study, MnO2 hollow spherical adsorbents were synthesized and their physicochemical parameters and Hg-0 removal ability were investigated at different calcination temperatures. The results showed that the adsorbent calcined at 300 degrees C demonstrated the highest performance, with over 90% Hg-0 removal efficiency achieved at 200 degrees C. The presence of surface acid sites promoted the physisorption of Hg-0 and compensated for the weak oxidative ability, leading to superior Hg-0 capture capacity. The Mars-Maessen mechanism helped to understand the Hg-0 capture pathways over Mn300.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Environmental Sciences
Qi Yu, Jingyi Feng, Jie Li, Anfei He, G. Daniel Sheng
Summary: The presence of surface oxygen-containing functional groups (OFGs) on carbonaceous materials influenced the adsorption capacity at different sites, with OFGs on mesoporous surfaces inhibiting adsorption while those on external surfaces promoting it. Multiple linear relationships were established between monolayer adsorption capacity and the amounts of OFGs at different sites. Factors such as compound properties and molecular polarity influenced the inhibition or promotion effects of OFGs on adsorption behavior.
Article
Engineering, Environmental
Youcai Zhu, Caiting Li, Yue Lyu, Shanhong Li, Yindi Zhang, Xueyu Du, Yunbo Zhai
Summary: The experimental results revealed that SO2 has a dual effect on Hg removal, acting both as a promoter and an inhibitor. Under specific conditions, HCl was found to significantly promote Hg removal. The 1V-8Ce/AC sorbent exhibited good sulfur resistance and stability under high temperature and high SO2 concentration conditions.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Chan Zou, Shuai Li, Xuanzhou Huan, Hongyun Hu, Lu Dong, Haojie Zhang, Qiqi Dai, Hong Yao
Summary: The addition of phosphorous was found to effectively promote the activation and modification of carbonaceous sorbents, enhancing their capacity for arsenic fixation. Experimental and density functional theory methods were used to investigate the adsorption characteristics of arsenic over different carbon-based sorbents. The results showed that phosphoric acid modification generated functional groups on the surface of activated carbon, significantly improving its adsorption ability for gaseous arsenic.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Lina Sun, Ping Ning, Xiaomin Zhao, Xin Song, Kai Li, Chi Wang, Xin Sun, Lijuan Jia
Summary: The study found that the CuO surface plays a crucial role in the competitive adsorption and reaction mechanism for SO2, NO, and Hg-0 removal. Different surfaces have different adsorption preferences and optimal reaction temperatures. Additionally, the CuO surface can promote oxidation and reduction reactions, playing an important role in catalytic removal of gas pollutants.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Yiyang Xiao, Yingju Yang, Jing Liu, Aijia Zhang
Summary: The concentration of SO2 coupled with high temperature is the main factor affecting the removal performance of CuMn2O4 sorbent for Hg0. At high temperatures, the presence of SO2 significantly inhibits the removal of Hg0 by CuMn2O4 sorbent.
Article
Engineering, Chemical
Jiachun Su, Jiancheng Yang, Mingkai Zhang, Mengkai Gao, Yiqing Zhang, Mengyi Gao, Long Chen, Yuan Huang, Zhuozhi Wang, Boxiong Shen
Summary: In this study, the modified V/Ti catalyst and the VRu/Ti catalyst doped with RuO2 were used for the heterogeneous catalytic oxidation of Hg0 removal. It was found that the VRu/Ti catalyst exhibited higher activity and Cl2 yield compared to V/Ti catalyst. The doping of Ru species caused changes in oxygen vacancies and electronic structure, resulting in enhanced nucleophilicity and weakened electrophilicity. This led to more active dissociation of HCl on VRu/Ti catalyst and a lower energy barrier for the mixed reaction pathway, indicating that Ru species improves the oxidation activity through a special Semi-Deacon reaction. The conclusions of this study provide important support for future modification research.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Ran Ao, Liping Ma, Quxiu Dai, Zhiying Guo, Hongpan Liu, Wengang Li
Summary: Acid etching of LaCoO3 perovskite can improve its simultaneous oxidation activity towards NO and Hg-0 in coal-fired flue gas, by altering the surface properties and structure of the perovskite.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Ran Ao, Liping Ma, Quxiu Dai, Zhiying Guo, Hongpan Liu, Xiong Xiong, Qinghuan Pan
Summary: Perovskite catalysts LaBO3 (B = Co, Mn, Ni, and Cu) show promising simultaneous oxidation activity for NO and Hg-0 in coal-derived flue gas, with LaMnO3 and LaCoO3 exhibiting the best performance among the studied perovskites.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Kening Yao, Xiao Zhang, Boxiong Shen, Qiqi Shi, Shuhao Li, Feng Shen
Summary: This study aims to design an efficient adsorbent for high-efficiency removal of elemental mercury (Hg0) from coal-fired power plant emissions. By co-implanting porous TiO2 with inorganic-organic dual functional sites (-SH and MnOx), the 2SH-MnOx/TiO2 adsorbent achieved a Hg0 removal efficiency of 90% at 175 degrees C and a high gas hourly space velocity (GHSV) of 120,000 h-1. The co-existence of -SH and MnOx was found to promote Hg0 adsorption and enhance the transfer of electrons from Hg0 to the adsorbent surface.
Article
Engineering, Environmental
Ting Yao, Jisheng Long, Yufeng Duan, Rajender Gupta, Zhenghe Xu
Summary: In this study, alpha-MnO2 was supported onto silica coated magnetite nanoparticles (MagS-Mn) to investigate the adsorption and oxidation of Hg0 and the influence of SO2 and O2 on Hg0 removal. MagS-Mn exhibited a Hg0 removal capacity of 1122.6 mu g/g at 150 degrees C with the presence of SO2. The adsorption and oxidation efficiencies of Hg0 were 2.4% and 90.6%, respectively. The Hg0 removal capability decreased at higher temperatures.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Che-Jung Hsu, Yan-Ze Xiao, Hsing-Cheng Hsi
Summary: Seawater flue gas desulfurization is effective in controlling sulfur dioxide emissions and removing mercury from coal-fired power plant flue gases. However, issues such as environmental impact and re-emission of gaseous mercury need to be addressed. The study found that copper/sulfur co-impregnated activated carbon can capture aqueous mercury and inhibit gaseous mercury re-emission effectively.
