Article
Engineering, Environmental
Wei Cui, Yang Xu, Guangqian Luo, Qingzhu Zhang, Zehua Li, Shibo Zhang
Summary: In this study, magnetic Cu-Fe binary oxide sorbents were modified by oxygen non-thermal plasma for efficient removal of elemental mercury from coal-fired flue gas. Plasma treatment improved the Fe3+, Cu2+, and lattice oxygen content in the sorbents, leading to higher Hg-0 removal efficiency. Both experimental results and kinetic model confirmed that chemisorption is the dominant factor for Hg-0 removal over the modified sorbents.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Qingyu Ji, Guangqian Luo, Mengting Shi, Renjie Zou, Can Fang, Yang Xu, Xian Li, Hong Yao
Summary: This study proposes a cost-effective and efficient method using non-thermal plasma (NTP) to accelerate the reactions between H2S and SO2 on activated carbon (AC) to improve elemental mercury (Hg0) removal performance. The NTP treatment was found to significantly increase the reaction rate between H2S and SO2 on AC, leading to improved Hg0 removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Wei Cui, Yang Xu, Guangqian Luo, Qingzhu Zhang, Zehua Li
Summary: In this study, non-thermal plasma (NTP) was used to improve the catalytic oxidation performance of Cu-Fe binary oxides (CFs) for simultaneous removal of NO and Hg-0 from coal combustion flue gas. The treated CF samples showed significantly better NO removal performance compared to the raw CF samples over a wide range of reaction temperatures. The effects of plasma discharge time, power, atmosphere, and reaction temperature on NO removal were analyzed. The presence of O-2 facilitated Hg-0 and NO removal, while H2O had adverse effects. The CF samples displayed better resistance to sulfur poisoning and the optimum reaction temperature for simultaneous NO and Hg-0 removal was determined to be 300 degrees C. The mechanism responsible for NO/Hg-0 removal was revealed, with CuO and Fe2O3 as active components.
Article
Energy & Fuels
Weiwei Shan, Bo Zhao, Linbo Qin, Yiming Wang, Qiang Zhang, Wangsheng Chen, Jun Han
Summary: In this study, iron-modified manganese oxide octahedral molecular sieve (Fex-OMS-2) was prepared through hydrothermal synthesis method to improve the sulfur resistance of OMS-2 for Hg0 oxidation. The Hg0 removal efficiency of Fe0.05-OMS-2 reached 98% at 150 degrees C. Even in the presence of 1500 ppm SO2, its mercury removal efficiency remained at 89.2%, while OMS-2 only achieved 54% under the same condition. Characterization results showed that Fe0.05-OMS-2 had a spinel structure with Fe2O3 wrapped on the catalyst surface.
Article
Chemistry, Analytical
Miao Shi, Bridget A. Bergquist, Anwen Zhou, Yaqiu Zhao, Ruoyu Sun, Jiubin Chen, Wang Zheng
Summary: The efficiency of cold vapor generation (CVG) method for sample introduction in mercury (Hg) isotope analysis and its impact on Hg isotope analysis have been investigated in this study. The efficiency of Hg CVG can be affected by the sample uptake rate, sample matrix, and the design of the gas-liquid separator (GLS). Matrix separation, optimal GLS design, and tuning the sample uptake rate are crucial for obtaining high accuracy and precision in Hg isotope analysis.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Engineering, Environmental
Miaomiao Qu, Zhuowei Cheng, Zhirong Sun, Dongzhi Chen, Jianming Yu, Jianmeng Chen
Summary: Volatile organic compounds (VOCs) emitted from industrial processes are harmful pollutants, and hybrid plasma-catalytic technology is an efficient method for their removal. The synergy between non-thermal plasma (NTP) and catalysts plays a key role in VOC abatement. Specific examples of VOCs removed using the NTP-catalyst technology are reviewed, with emphasis on controlling by-products and discussing future applications.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Green & Sustainable Science & Technology
Joo Chan Lee, Se-Won Park, Hyun Sub Kim, Tanvir Alam, Sang Yeop Lee
Summary: The study assessed the oxidation characteristics of elemental mercury based on the input gas environment, temperature, and particle size distribution of the steel slag. Experimental results showed that oxidation of elemental mercury rarely occurred in air environment, but a stronger oxidation reaction was observed in the HCl gas environment, especially with smaller particles of steel slag. The oxidation reactivity was significantly higher at temperatures between 100℃ and 200℃ compared to room temperature. Further research is needed to determine the precise temperature range for the oxidation reaction.
Article
Engineering, Environmental
Can Li, Vishnu Sriram, Joo-Youp Lee
Summary: In this study, the impact of HCl and NH3 on Hg(0) oxidation catalytic reaction was investigated through real-time Hg(0) oxidation experiment and X-ray Absorption Near-Edge Structure analysis. The research revealed that Hg(0) oxidation is influenced by the combined action of HCl and O-2. HgCl2 was identified as the major mercury species formed on the spent catalyst under typical flue gas conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
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, 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
Min-Ryeong Kim, Woojin Jeon, Suhan Kim
Summary: In this study, a process combining non-thermal plasma (NTP) and wet scrubber (WS) system was developed to efficiently remove odorous volatile organic compounds (VOCs). The NTP + WS system showed significantly improved removal efficiency of ethyl acrylate (EA) and reduced ozone emissions compared to using WS and NTP separately. The system achieved a maximum EA removal efficiency of 99.9% and a 100% ozone removal efficiency, even at low discharge voltages. This study demonstrates the NTP + WS system as a green technology for the removal of odorous VOCs.
Article
Engineering, Environmental
Xiaopeng Zhang, Xiangkai Han, Yuying Wei, Xinxin Wang, Ning Zhang, Junjiang Bao, Gaohong He
Summary: The Co-based catalyst Co-2.5-SAs@NC, with single Co atoms in an aggregation state, has shown promising results in efficiently converting gaseous oxygen into chemisorbed oxygen and achieving nearly 100% Hg-0 oxidation efficiency at low temperatures. This catalyst has the potential to be a viable option for Hg-0 oxidation from flue gas due to its highly coordinated unsaturated state and excellent ability to transform gaseous oxygen into chemisorbed oxygen.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Analytical
Yihuan Song, Qingfang Ma, Heyong Cheng, Jinhua Liu, Yuanchao Wang
Summary: A method utilizing online solid-phase extraction coupled with high performance liquid chromatography and inductively coupled plasma mass spectrometry was developed for simultaneous enrichment and analysis of ultra-trace lead and mercury species in water. This method allows for efficient and accurate determination of lead and mercury species in water samples, with high enrichment factors and low LODs and LOQs. The method was successfully applied to analyze trace lead and mercury species in various types of water samples, showing promising results for unstable sample analysis.
ANALYTICA CHIMICA ACTA
(2021)
Article
Engineering, Environmental
Jianqiang Shi, Zhen Wang, Jinxing Mi, Hao Liu, Bing Wang, Haiyan Liu, Jiancheng Wang, Jianjun Chen, Junhua Li
Summary: Ce-modified commercial vanadium-based catalysts are still being rapidly developed to optimize Hg0 oxidation performance. The introduction mode of Ce on Hg0 oxidation is still unclear. Introducing Ce as a promoter (VCe/Ti) to vanadium-based catalysts plays a more effective role in Hg0 oxidation than doping Ce into TiO2 support (V/CeTi). The excellent performance of the VCe/Ti catalyst is attributed to its redox ability, HCl adsorption capacity, surface oxygen vacancies, and redox equilibrium, which improve electron transfer and catalytic activity. This work offers the potential application of Ce-modified V-based catalysts for simultaneous control of NOx and Hg0 in stationary sources.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
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)
