Article
Chemistry, Multidisciplinary
Qingshan Zeng, Hui Wang, Jingmao Wu, Hengyuan Ran, Kang Yang, Jianfei Wu
Summary: Experiments were conducted to investigate the effects of acid gases on the mercury removal efficiency of the adsorbent. The results showed that SO2 blocked the pore structure on the adsorbent surface, while HCl and NO promoted the oxidation of mercury. Under certain conditions, the optimum mercury removal efficiency of the adsorbent was nearly 100%.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Qixin Zhou, Jinsong Zhou, Hui Cao, Xinyu Xu
Summary: Coal gasification is a popular method for optimizing coal utilization and reducing environmental pollutant emissions, but the reducing atmosphere is disadvantageous for removing elemental mercury. This study used activated cokes for mercury capture in a reducing atmosphere, and found that high-temperature heating decreases the mercury-removal capability of carbon sorbents.
Article
Chemistry, Multidisciplinary
Yiming Zhu, Jingmao Wu, Hui Wang, Jiajun Wang, Haotian Shen, Zhanfeng Ying
Summary: This study investigated the adsorption of mercury by 1% NH4Cl-modified biomass char under oxy-fuel combustion conditions, and analyzed the effects of temperature, adsorption bed height, and initial mercury concentration on the adsorption process. The results demonstrated that higher temperature and initial mercury concentration led to better mercury adsorption performance, which was closely related to the progress of chemical adsorption and external mass transfer.
Article
Engineering, Chemical
Yuying Wei, Xiaopeng Zhang, Cheng Gao, Xinxin Wang, Ning Zhang, Junjiang Bao, Gaohong He
Summary: The organic-inorganic hybrid nanowires prepared by hydrothermal method can be used to prepare mesoporous Co3O4 nanotube sorbents, which have a well-defined tubular structure, abundant active sites, and high redox property, effectively removing Hg0 from flue gas.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Jingmao Wu, Hui Wang, Haotian Shen, Chang Shen, Yiming Zhu, Jianfei Wu, Hengyuan Ran
Summary: Experimental results showed that a low-level of H2O had a promoting effect on the adsorption of H-0, and high-level of H2O had an inhibiting effect. A high concentration of H2O would form a water film on the surface of sorbent traps to hinder the removal of external mass transfer on H-0.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Wei Zheng, Zequn Yang, Jiefeng Chen, Weizhen He, Ruiyang Qin, Hongxiao Zu, Wenqi Qu, Jianping Yang, Lijian Leng, Hailong Li
Summary: Ti3C2 MXene/Cu2Se sorbent synthesized via a Lewis acid etching route combined with room-temperature selenization pathway shows excellent Hg0 adsorption performance, with higher adsorption capacity and uptake rate compared to other metal selenides. It also maintains outstanding adsorption performance under high temperature and is applicable to various fuel gas situations.
Article
Engineering, Chemical
Xiaopeng Zhang, Yuying Wei, Lianhao Zhang, Xinxin Wang, Ning Zhang, Junjiang Bao, Gaohong He
Summary: Adsorption is an efficient method for removing Hg0 from coal flue gas. In this study, Co3O4 nanotubes were embedded into GO nanosheets to prepare a composite material with good dispersion. The GO-Co3O4-1-2 sorbent showed the best O beta/OT ratio and redox capacity, providing more active sites for O2 capture and activation. The Hg0 removal efficiency of GO-Co3O4-1-2 reached 94.67% with good stability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Yiming Wang, Bo Zhao, Weiwei Shan, Linbo Qin, Xi Sun, Qiang Zhang, Wangsheng Chen, Xiaowei Liu, Jun Han
Summary: A new type of tungsten-doped Mn-Mo/CNT catalyst has been prepared and its surface properties and mercury removal ability in simulated flue gas have been investigated. The addition of tungsten changes the surface structure, increases pore volume, and enhances the mercury removal ability of the catalyst.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Environmental
Abhishek Dwivedi, Ravindra Gudi, Pratim Biswas
Summary: This paper presents a tri-reforming coupled methanol production process, which has been improved to increase the potential for CO2 valorization and profitability. By modifying the process, optimizing oxygen and hydrogen inputs, and limiting oxygen input to achieve thermoneutrality, significant enhancements were achieved through simulation runs.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Ming-Xin Xu, Hai-Bo Wu, Ya-Chang Wu, Han-Xiao Wang, Hao-Dong Ouyang, Qiang Lu
Summary: The process of flue gas compression and purification plays a crucial role in determining the quality of CO2 product in oxy-fuel combustion. A novel system integrating partial CO2 recirculation with flue gas purification was proposed and evaluated, achieving a purity of 99.9% CO2 stream. Enhancing condensing pressure to 3.0-4.0 MPa improved CO2 recovery performance, while critical ratios between recycled CO2 liquid and raw flue gas were identified for efficient contaminant abatement. The efficiencies of SO2 and NO removal exceeded 99%, with critical molar ratios and reactions pressures determining the success of abatement.
Article
Engineering, Environmental
Haomiao Xu, Qinyuan Hong, Zhao-Yang Zhang, Xiangling Cai, Yurui Fan, Zhisong Liu, Wenjun Huang, Naiqiang Yan, Zan Qu, Lizhi Zhang
Summary: A superstable Hg3Se2Cl2 compound is discovered and proven to be a promising solution for efficient and safe flue gas mercury removal. The compound exhibits high thermal stability and strong acid resistance, and laboratory experiments demonstrate its exceptional performance in removing mercury from flue gas. This study highlights the importance of stable demercury products in flue gas treatment and provides an efficient and practical demercury strategy.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Ziyao Yang, Yang Xu, Xuehui Sun, Cong Nie, Mantang Chen, Qingzhu Zhang, Guangqian Luo
Summary: In this study, novel S-doped sorbents were developed for Hg0 removal from coal-fired flue gas by one-step co-pyrolysis of biomass and scrap tires under SO2 atmosphere. The presence of SO2 improved the performance of S-doped sorbents and resulted in increased sulfur content and decreased carbon content. The activated sorbents had higher specific surface area, pore volume, and micropore content compared with raw sorbents. The S-doped sorbents showed excellent performance for Hg0 removal and good water-resistance due to the presence of ZnS. O2 and NO had positive effects on Hg0 removal and the behavior of Hg0 removal over S-doped sorbents followed a pseudo-second-order model.
Article
Engineering, Chemical
Xiaopeng Zhang, Yuying Wei, Lianhao Zhang, Xinxin Wang, Ning Zhang, Junjiang Bao, Gaohong He
Summary: Adsorption is an effective method for removing Hg0 from flue gas, and the morphology and active site of sorbents play a crucial role in the removal efficiency. By utilizing a hierarchical porous nanosheet-based nanotube structure, the mass transfer resistance can be reduced and more active sites can be provided. Organic-inorganic hybrid nanowires of Co-aspartic acid were used as a template to prepare CuCo2O4 sorbents with favorable physicochemical properties. The CuCo2O4-1-2 sorbent exhibited the best hierarchical porous nanosheet-based nanotube structure, excellent redox properties, high Hg0 removal efficiency of 89%, good poisoning resistance, and stability under specific conditions. The Cu-Co active site on the CuCo2O4 surface played a crucial role in capturing and activating O2.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Giorgia De Guido
Summary: This article focuses on the CO2 capture from oxy-combustion flue gas using a distillation-based hybrid process and analyzes the energy and economic aspects. The results show that the hybrid process has lower energy consumption compared to standalone cryogenic distillation, although it has higher capital costs.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Energy & Fuels
Shuaibo Cui, Yue Zhao, Yangxian Liu, Renkun Huang, Jianfeng Pan
Summary: Two types of straw porous biochars were prepared using microwave-assisted KOH activation to eliminate H2S in the gas phase. The physical structures of the biochars were improved, and the oxygen-containing functional group content was raised. The adsorbents exhibited high specific surface areas and good performance for eliminating H2S, with equilibrium adsorption capacities of 57.91 and 61.47 mg/g.
Article
Thermodynamics
Zhenghong Zhao, Zewu Zhang, Xiaojian Zha, Ge Gao, Xiaoshan Li, Fan Wu, Cong Luo, Liqi Zhang
Summary: In the MILD-oxy combustion process, the accumulation of H2O in the recycled flue gas, particularly under wet flue gas recirculation, has significant effects on combustion behavior and NOx emissions. Adding H2O reduces flame temperature and enhances radiative heat transfer. It also affects turbulent Damkohler and Karlovitz numbers, causing a slow-chemistry feature in the reaction zone. H2O addition promotes gasification reactions and inhibits in-furnace NO formation, resulting in low NOx emissions.
Article
Thermodynamics
Zewu Zhang, Zhenghong Zhao, Liqi Zhang
Summary: Compared with traditional air combustion, unconventional combustion technologies show significant changes in combustion mode and medium, as well as altered gasification behavior of coal char, leading to influences on flame temperature, heat transfer, char combustion, NOx emissions, and PM formation. This study reviews the progress in understanding coal char gasification behavior during unconventional combustion modes, including the combustion principle, effects of operating conditions, transformation between combustion and gasification regimes, and the influencing mechanisms of gasification on pulverized coal combustion. The study also discusses the challenges of these unconventional combustion technologies and their potential for achieving CO2 mitigation targets. It concludes that exploring the association between enhanced gasification and reduced NOx emissions is essential for C/N synergetic reduced emissions in the wide applications of carbon-based solid fuels.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Zhenghong Zhao, Zewu Zhang, Xiaojian Zha, Ge Gao, Wenchao Mao, Fan Wu, Xiaoshan Li, Cong Luo, Liqi Zhang
Summary: MILD-oxy combustion is a practical approach to control CO2 and NOx emissions. This study investigates the combustion characteristics and NO emissions of CH4/NH3 under MILD conditions with N-2, CO2, and H2O dilutions. It is found that CO2 dilution reduces flame temperature and radical pool level, while H2O dilution enhances OH radical formation. MILD-H2O combustion generates the lowest NO emissions, indicating its superiority in reducing NOx emissions.
Article
Energy & Fuels
Xiaojian Zha, Zewu Zhang, Zhenghong Zhao, Xiaoshan Li, Cong Luo, Fan Wu, Liqi Zhang
Summary: This study investigates the catalytic effects of alkali and alkaline earth metals (AAEMs) on the combustion performance of coal char, and finds that K has a better promoting effect. Additionally, the kinetic parameters of coal char combustion catalyzed by K are obtained, providing new insights into the improvement of coal char oxy-fuel combustion.
Article
Biochemistry & Molecular Biology
Xiaobo Cui, Chao Zhang, Liqi Zhang, Huaqing Yan
Summary: This study verified MYB proto-oncogene as a transcription factor and found that its expression level is significantly higher in various human cancers, and it is related to prognosis, immune score, and immune cells. MYB may serve as a powerful biomarker for tumor screening, prognosis, and individualized treatment strategy.
BIOSCIENCE REPORTS
(2023)
Article
Energy & Fuels
Zhenghong Zhao, Zewu Zhang, Xiaojian Zha, Ge Gao, Xiaoshan Li, Fan Wu, Cong Luo, Liqi Zhang
Summary: This study evaluates the feasibility of direct steam injection for forming an H2O-rich environment in MILD oxy combustion. The results show that inner-steam injection is better in controlling temperature rise and fluctuation, and maintaining MILD combustion. Inner-steam injection also inhibits fuel-N oxidation and enhances NO-reburning, leading to lower NO emission concentration.
Article
Chemistry, Applied
Yongqing Xu, Chuangao Lu, Cong Luo, Guang Wang, Xiaopei Yan, Ge Gao, Bowen Lu, Fan Wu, Liqi Zhang
Summary: This article introduces a new CaLP-TCES system that utilizes CO2 power cycle and steam power cycle to make full use of energy. The effects of different raw materials and organic acid modifications on the thermochemical energy storage performance of the CaO heat carriers in CaLP-TCES system are investigated. The results show that limestone is the best option for CaLP-TCES and glycine-modified limestone has a higher carbonation conversion rate. The full-day time mode of CaLP-TCES has a higher overall system efficiency and is more applicable for concentrated solar power.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Environmental Sciences
Zhengshuai Sun, Dingding Yao, Huang Guo, Haodong Zhu, Wenbin Hua, Qiaoxia Yuan, Liqi Zhang, Qizhou Fan, Baojun Yi
Summary: In this study, N-containing biochar was prepared under different conditions, and the interaction between N-containing biochar and biomass pyrolysis volatiles was studied. The results showed that N-containing biochar can act as adsorbents, catalysts, and reactants simultaneously, and different N configurations have different catalytic effects.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Geochemistry & Geophysics
Liqi Zhang, Hongfei Zhang, He Yang, Huimin Su, Shasha Zhang
Summary: The study finds that mafic magmatic enclaves, host monzonitic granites, and quartz diorites have similar rock geochemical and isotopic compositions, indicating similar parental magmas. The high-silica biotite granites represent melts extracted from the same magma system. This study emphasizes the role of crystal-melt separation and fractional crystallization in the generation of silicic igneous rocks.
Article
Energy & Fuels
Zhenghong Zhao, Zewu Zhang, Xiaojian Zha, Ge Gao, Xiaoshan Li, Fan Wu, Cong Luo, Liqi Zhang
Summary: Moderate or intense low-oxy dilution oxy-fuel (MILD-oxy) combustion can synergistically reduce CO2 and NOx emissions. Numerical simulations show that increasing O2 concentration weakens flue gas recirculation and promotes combustion intensity. Dry recycle mode has a more uniform temperature distribution, while wet recycle mode achieves diffusion/kinetics-controlled MILD regime. Dry recycle mode slows down coal char burnout, while wet recycle mode has more potential in achieving low NOx emission.
Article
Chemistry, Applied
Dingshan Cao, Cong Luo, Tong Luo, Zhaowei Shi, Fan Wu, Xiaoshan Li, Ying Zheng, Liqi Zhang
Summary: The focus of this study is to develop highly active and stable catalysts for the dry reforming of methane (DRM) technology. Using crystalline oxides as catalyst precursors is an effective optimization scheme for DRM. This paper systematically studies the application of La2NiO4 perovskite in DRM, including preparation methods, characterization, carbon deposition properties, regeneration properties, and B-site doping. The results show that the sample prepared by the sol-gel method exhibits the highest conversion of CH4 and CO2 and the best carbon resistance in DRM, while the sample prepared by the solid-state method shows the lowest DRM performance due to the small amount of reduced amorphous NiO and the weak reducibility of the perovskite phase.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Environmental
Dingshan Cao, Cong Luo, Zengqiang Tan, Tong Luo, Zhaowei Shi, Fan Wu, Xiaoshan Li, Ying Zheng, Liqi Zhang
Summary: The reactivity and carbon deposition properties of La2NiO4 as a catalyst in DRM were studied, along with its regeneration performance. The results showed that La2NiO4 had good temperature stability and carbon deposition inhibition effects. However, air-regenerated samples exhibited a hysteresis time in DRM.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
