Article
Chemistry, Physical
Mengli Zhou, Yang Xu, Guangqian Luo, Qingzhu Zhang, Lin Du, Zehua Li
Summary: This study prepared Ce-Fe binary oxide modified bentonite for mercury removal from flue gas. The modified bentonite showed better removal performance and the removal mechanism was revealed. Furthermore, the deactivated modified bentonite can be effectively regenerated after thermal treatment.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Yongpeng Ma, Tengfei Xu, Ling Li, Jiandong Wang, Yu Li, Hongzhong Zhang
Summary: The study found that α-Fe2O3/SnO2 binary oxides have high efficiency in removing gaseous elemental mercury, especially at high temperatures, with involvement of O-2. SO2 and H2O vapor can reduce the removal efficiency, while the presence of HCl greatly enhances it. The mechanisms of removal involve catalytic oxidation and adsorption processes, with involvement of Fe3+, O2-, Sn4+, and Sn2+.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Wenjun Huang, Chenxi Zong, Zhisong Liu, Qinyuan Hong, Leipeng Ji, Haomiao Xu, Zan Qu, Naiqiang Yan
Summary: This paper investigates the removal of gaseous elemental mercury (Hg0) from industrial flue gas using Mn-based oxides modified SAPO-34 molecular sieve. The results show that deposition of 5% Mn on the surface of SAPO-34 enhances Hg0 removal efficiency, especially at lower temperatures. The surface MnOx particles enhance the oxidation of Hg0 and facilitate its adsorption.
Article
Engineering, Environmental
Lu Dong, Hai Wang, Yaji Huang, Hao Chen, Haoqiang Cheng, Lingqin Liu, Ligang Xu, Jianrui Zha, Mengzhu Yu, Sheng Wang, Yufeng Duan
Summary: Magnetic manganese-iron modified attapulgite sorbents were synthesized and shown to have optimal Hg-0 removal activity in coal-fired flue gas under certain conditions, which could potentially reduce costs and maximize the utilization of green energy sources.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Yifei Long, Zhong He, Xiaoyi Li, Yajie Yin, Yuan Wang, Honghu Li, Jiangjun Hu
Summary: The study focused on the removal of Hg-0 from coal-fired flue gas using attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP). It was found that NO and HCl could effectively improve the efficiency of mercury removal, while SO2 and H2O inhibited the oxidation of Hg-0. Introducing copper could enhance the sample's resistance to SO2, leading to a higher mercury removal efficiency.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Dong Ye, Xiaoxiang Wang, Runxian Wang, Senyuan Wang, Hui Liu, Haining Wang
Summary: This review discusses the progress in the application of MnO2-based materials for mercury removal, summarizing the fundamentals of MnO2, the properties of various adsorbents, and the effects of gas species on mercury capture capacity. The possible mercury adsorption mechanisms and regeneration methods are also explored, with a suggestion for the development of new MnO2-based adsorbents for future research.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Yang Xu, Guangqian Luo, Mengli Zhou, Qingzhu Zhang, Zehua Li, Shibo Zhang
Summary: This study investigated the use of NFM as a cost-effective sorbent for Hg-0 removal from flue gas, showing that untreated NFM had high efficiency over a broad temperature range, while calcination process might have negative effects on its performance. The research also revealed the Hg-0 removal mechanism and demonstrated the dominance of chemisorption in the process.
Article
Energy & Fuels
Hui Luo, Shilin Zhao, Anjun Ma, Kang Sun, Yanqun Zhu, Zhiqiang Sun
Summary: This study investigated the effects of flue gas components (O2, CO2, SO2, and NO) on the Hg-0 removal of mechanochemical S2Cl2-modified BC (S2Cl2-MC). It was found that O2 and CO2 promoted the escape of Hg2+ but inhibited the adsorption of Hg-0, while SO2 and NO had a certain promoting effect on the removal of Hg-0.
Article
Energy & Fuels
Yongpeng Ma, Tengfei Xu, Xiaojing Zhang, Zihan Fei, Hongzhong Zhang, Haomiao Xu, Yunxia Ma
Summary: This study successfully prepared modified layered MCM-22 zeolite with highly dispersed Mn active sites for efficient removal of gaseous elemental mercury (Hg-0). The mechanism of Hg-0 removal mainly involves catalytic oxidation and chemisorption on Mn active sites, with Mn playing a bridging role between Hg and O in the pores of Mn/MCM-22 zeolite. The promising Mn/MCM-22 zeolite composite demonstrates high potential as a sorbent for Hg-0 removal from flue gas.
Review
Engineering, Environmental
Yu Guan, Yinhe Liu, Qiang Lv, Jiang Wu
Summary: Photocatalytic oxidation is a promising technology for addressing industrial flue gas mercury (Hg) pollution. Bi-based photocatalysts have attracted attention due to their unique structures and high performance, offering potential solutions to the issue.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Energy & Fuels
Zijian Zhou, Lei Liu, Xiaowei Liu, Yue Zhou, Changqing Wang, Jingying Xu, Guozhang Chang, Minghou Xu
Summary: MnOx-based oxides are efficient catalysts for elemental mercury oxidation in flue gas, and combining with CeO2 or CeO2-ZrO2 enhances their catalytic activity. The new MnOx-CeO2-ZrO2 solid solution catalyst showed better Hg-0 oxidation performance compared to the MnOx/CeO2-ZrO2 supported catalyst. Mn4+ and surface active oxygen were identified as the active species in Hg-0 oxidation reactions, and SO2 significantly inhibited the activity of MnOx/CeO2-ZrO2 but had less impact on MnOx-CeO2-ZrO2 solid solution.
Article
Energy & Fuels
Yang Xu, Mengli Zhou, Mantang Chen, Qingzhu Zhang, Lin Du, Guangqian Luo
Summary: Natural ferruginous manganese ore (FMO) was developed as an economical NH3-SCR catalyst for simultaneous elimination of NO and elemental mercury (Hg0) from coal-fired flue gas. The chemical composition, pore structure, crystal structure and surface chemistry of FMO were characterized and the effects of various parameters on the removal efficiency of NO and Hg0 were studied. The results showed that FMO exhibited high removal efficiency for both NO and Hg0 under optimal conditions.
Review
Engineering, Environmental
Ting Liu, Zhuo Xiong, Peng Ni, Zizhen Ma, Yan Tan, Zishun Li, Shengnan Deng, Yincui Li, Qirong Yang, Huawei Zhang
Summary: This review focuses on the current situation of Hg0 removal on different kinds of adsorbents in coal combustion flue gas, smelting flue gas, and natural gas. Hydrophobic groups, hydrophobic materials, and modification of sulfur/selenium pretreatment and metals loading can effectively overcome the problem of H2O and SO2. Additionally, separation, regeneration, and recovery aspects are explored and summarized, with thermal treatment accompanied by different components being widely adopted as an efficient approach to recover the adsorption ability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Engineering, Environmental
Wei Zheng, Hailong Li, Zequn Yang, Jianping Yang, Wenqi Qu, Fanyue Meng, Yong Feng, Zhengyong Xu, Xueyi Guo
Summary: This review highlights the global concerns over mercury contamination and the advantages of mineral chalcogenides in immobilizing gaseous elemental mercury. It provides an overview of research progress and application conditions of mineral chalcogenides for Hg-0 removal, as well as comparisons of their adsorption performance. Comprehensive discussions on influential factors and mechanisms for Hg-0 removal by different mineral chalcogenides are also presented to guide future research directions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Qiongdan Zhang, Chengcheng Zheng, Ke Zhang, Yong Zheng, Yihong Xiao, Lilong Jiang
Summary: A novel catalyst structure comprising Ce-Mn solid solution and amorphous CeO2 (50Ce-Mn) was synthesized, which exhibited high catalytic activity, stability, and sulfur selectivity. The high specific surface area of 50Ce-Mn facilitated reactant access and sulfur desorption, while the strong Ce-Mn interaction and abundant surface-active oxygen species contributed to the regeneration of active sites and inhibited sulfate accumulation.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Applied
Lin Yue, Zhihua Xu, Minghua Hu, Mingjiao Tian, Mudi Ma, Bijie Huang, Chi He
Summary: This study fabricates a series of PdCe/OMS-2 catalysts with different Pd/Ce molar ratios, and extensively characterizes their physicochemical properties. The results show that complete conversion of toluene can be achieved over PdCe2 at 207 degrees C with low activation energy. The synergistic effect between Pd and Ce enhances the catalytic activity of OMS-2, attributed to the abundant Mn3+-O bands and active surface oxygen species.
JOURNAL OF RARE EARTHS
(2023)
Article
Energy & Fuels
Jinxiu Wang, Yuqiu Liu, Xianfang Yi, Yanting Chen, Yanke Yu, Jinsheng Chen
Summary: Researchers have developed a novel NH3-SCR catalyst to control NOx emissions from fossil fuel combustion. By doping CeO2 catalysts with Fe and conducting sulfation treatment on porous nanorods, the catalysts showed improved conversion of NOx. The introduction of Fe and sulfation treatment resulted in changes in morphology, surface area, and acidity of the catalysts, contributing to enhanced catalytic activity.
Article
Chemistry, Multidisciplinary
Lu Li, Jingjie Zhang, Han Xu, Mingjiao Tian, Chi He
Summary: This study conducts a systematic comparison of various typical noble metal catalysts and explores the potential for CVOC destruction, providing an overall view of their universal applicability for practical use.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Environmental
Lei Chen, Xiaoke Hou, Jinping Zhang, Chen Zhang, Chao Li, Zaoxiao Zhang, Li Tian, Guowei Guan, Zhenyu Zhang, Renyi Shi, Chi He
Summary: In this study, a chelating agent-assistant strategy was employed to regulate the content of oxygen vacancy over gamma-MnO2 catalysts, which were used for NO oxidation. The use of chelating agents effectively enhanced the formation of oxygen vacancies, leading to an increase in the amount of surface-active oxygen species and resulting in remarkable low-temperature catalytic activity. This study demonstrates the potential of chelating agents in the design of high-efficient catalysts for environmental remediation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Zishen Lin, Fobang Liu, Chunli Zheng, Aibin Zhu, Xiaowei Ma, Yuanzhe Peng, Chi He
Summary: This study investigated the effect of different ratios of EDA/Fe(II) on the physicochemical properties of AZVI. The results showed that increasing the EDA/Fe(II) ratio improved the reduction ability and Cr(VI) removal efficiency of AZVI. However, when the ratio exceeded 3/1, severe oxidation of the AZVI surface occurred, leading to a decrease in reduction ability.
Article
Engineering, Chemical
Aihua Cheng, Xingwen Wang, Xiaohe Liu, Chi He
Summary: Iron-modified biochar modified in a wet process by K2FeO4 shows well-distributed iron oxide on the surface, leading to an improved adsorption capacity for Cr(VI) removal.
Article
Chemistry, Physical
Yanke Yu, Mengqiao Geng, Jiahang Li, Jingjing Wang, Desheng Wei, Chi He
Summary: Commercial V2O5-WO3/TiO2 (VWTi) catalysts with varied Zn loading were used in NH3-SCR reaction, and the effect of SO2 on Zn-poisoned VWTi catalysts was investigated. Zn caused deactivation of VWTi catalysts, but the effect of SO2 varied with Zn loading. Low Zn-content catalyst (1.0 wt.%, ZnL) showed activity recovery with SO2, while high Zn-content catalyst (4.0 wt.%, ZnH) showed no influence. Characterization of the catalyst was done using N2 adsorption-desorption, XRD, XPS, SO2-TPD, NH3-TPD, H2-TPR, and in situ DRIFTS. Tri-coordinated sulfate species formed on ZnL sample in the presence of SO2, creating new Bronsted acid sites and promoting activity recovery, while ZnSO4 appeared on ZnH sample under SO2 without forming Bronsted acid sites, resulting in little change in activity.
CHEMICAL PHYSICS IMPACT
(2023)
Article
Engineering, Environmental
Jian-Rong Li, Jie Zheng, Kun Wu, Mengmeng He, Junyi Zhao, Yang Meng, Jun He, Hong-Yun Ren, Hang Xiao, Chi He
Summary: The study fabricated Mn-Al oxides with strengthened synergistic effects of Mn and Al species by adjusting the calcination temperature. Different temperatures effectively controlled the surface Mn/Al ratio and KMn8O16 phase, leading to significant changes in CO2 selectivity, reaction rate, and stability for catalytic oxidation. Mn5Al-350 catalyst exhibited the best performance with a high CO2 selectivity and superior catalytic stability. Reaction intermediates and theoretical calculations provided insights into the reaction mechanism.
ACS ES&T ENGINEERING
(2023)
Article
Engineering, Environmental
Changwei Chen, Mohammadreza Kosari, Shibo Xi, Alvin M. H. Lim, Chi He, Hua Chun Zeng
Summary: Achieving high catalytic activity and selectivity in CO2 hydrogenation to methanol using nonprecious metals remains a challenge. Here, we spatially sequestered the ternary Cu-ZnO-ZrO2 on an engineered mesoporous silica sphere, resulting in an enhanced methanol yield under moderate conditions. The confined interface and optimized interfacial environment of the catalyst inside mesoporous silica contribute to the improved performance and stability.
ACS ES&T ENGINEERING
(2023)
Article
Chemistry, Physical
Junwei Xu, Qiyuan Liu, Zhaohui Chen, Lu Li, Yanfei Jian, Reem Albilali, Chi He, Mudi Ma
Summary: In this study, a series of Cu-Mn modified hierarchial SAPO-34 zeolite catalysts were synthesized and their physicochemical properties and catalytic performance were investigated. Among them, CuMn/S-1 showed the highest activity and selectivity, as well as high stability and water resistance.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Multidisciplinary
Zishen Lin, Jiang Xu, Aibin Zhu, Chi He, Changzhao Wang, Chunli Zheng
Summary: This study synthesizes sulfidated amorphous zerovalent iron (SAZVI) with an amorphous structure using various sulfur precursors, resulting in increased specific surface area and hydrophobicity. The removal efficiency of SAZVI-Na2S for Cr(VI) is 8.5 times higher than that of amorphous zerovalent iron (AZVI). The water contact angle, free corrosion potential, and surface Fe(II) proportion play crucial roles in Cr(VI) removal. The enhanced elimination ability of SAZVI-Na2S is attributed to the adsorption of Cr(VI) by the FeS x shell, followed by the rapid release of internal electrons to reduce Cr(VI) to Cr(III), resulting in the precipitation of FeCr2O4 and Cr2S3 on the surface of SAZVI-Na2S.
Review
Chemistry, Physical
Yang Yang, Shenghao Zhao, Lifeng Cui, Fukun Bi, Yining Zhang, Ning Liu, Yuxin Wang, Fudong Liu, Chi He, Xiaodong Zhang
Summary: This review systematically reviews the recent research progress in photothermal catalytic removal of volatile organic compounds (VOCs) using nano-catalysts. It describes the fundamentals of photothermal catalysis, catalyst fabrication, and proposes a design strategy for optimizing photothermal catalysis performance. The performance of VOC degradation with photothermal catalysis is evaluated and compared, and the catalytic mechanism of VOC oxidation is introduced. The limitations, challenges, and potential research directions in this field are also discussed.
GREEN ENERGY & ENVIRONMENT
(2023)
Article
Chemistry, Physical
Yanke Yu, Mengqiao Geng, Desheng Wei, Chi He
Summary: Due to its renewability, abundance, and low environmental impact, biomass is considered a viable eco-friendly fuel. This study investigates the effect of potassium (K) on the NH3-SCR performance of CuSO4/TiO2 catalyst and compares it with the effect on a commercial V2O5-WO3/TiO2 (VWTi) catalyst. The presence of K was found to enhance the oxidation of NH3 to N2O, NO, and NO2 during NH3-SCR, thereby decreasing the NOx conversion over CuSO4/TiO2.
ACTA PHYSICO-CHIMICA SINICA
(2023)
Meeting Abstract
Chemistry, Physical
Ting Zhang, Yu-jing Wang, Ling-min Yu, Li-min Shi, Shou-ning Chai, Chi He
