Junying Zhang

Xi'an Technological University

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Yongchun Zhao

Huazhong University of Science and Technology

113

Chuguang Zheng

Huazhong University of Science and Technology

Zhuo Xiong

Huazhong University of Science and Technology

Yongchun Zhao

Huazhong University of Science and Technology

Jianping Yang

Central South University

Hailong Li

Central South University

Haibin Chen

Xi'an Technological University

Bengen Gong

Huazhong University of Science and Technology

Chong Tian

Dalian Medical University

Rihong Xiao

Huazhong University of Science and Technology

Cooperative Institutions

Huazhong University of Science and Technology

147

Chinese Academy of Sciences

China University of Mining and Technology

University of Chinese Academy of Sciences

Beijing Normal University

Central South University

Xi'an Technological University

Peking University

Chinese Academy of Medical Sciences & Peking Union Medical College

Shanghai Jiao Tong University

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Chemical agglomeration of fine particles in coal combustion flue gas: Experimental evaluation

Fuel (2017)

Yiquan Guo Junying Zhang Yongchun Zhao Shaolong Wang Cheng Jiang

Zeta potential

10.1016/j.fuel.2017.05.008

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Citations (57)

Synergistic Mercury Removal over the CeMnO₃ Perovskite Structure Oxide as a Selective Catalytic Reduction Catalyst from Coal Combustion Flue Gas

Energy & Fuels (2018)

Shibo Zhang Yongchun Zhao Mercedes Díaz‐Somoano Jianping Yang Junying Zhang

The LaMnO3, CeMnO3, and PrMnO3 perovskite oxides were synthesized by the sol–gel method and employed as the catalyst of selective catalytic reduction (SCR) for NO removal and synergistic mercury removal from coal combustion flue gas. The experimental results indicated that CeMnO3 exhibited the best NO and Hg0 removal activity among the three catalysts. NO conversion over CeMnO3 could reach a maximum value of 89.2% in the atmosphere of 4% O2 + 400 ppm NO + 400 ppm NH3, and the optimal reaction temperature for the NO removal was 200–250 °C, demonstrating good low-temperature catalytic activity. Hg0 removal efficiency of CeMnO3 decreased with the rise of the reaction temperature. The individual flue gas components of O2, HCl, NO, and CO2 had promotions on the Hg0 removal over CeMnO3, while SO2, NH3, and H2O displayed inhibitory actions on the efficiency. The performance of CeMnO3 on simultaneous NO and Hg0 removal was the best at 200–250 °C in simulated coal-fired flue gas. Specifically, the NO conversion and Hg0 removal efficiency were, respectively, 73.7% and 80.9% at 200 °C, and both the efficiencies remained excellent stability during a long experimental period. A series of characterization analyses were also carried out to identify the physicochemical properties of the catalysts. The results demonstrated that the superior catalytic performance of CeMnO3 mainly derived from the abundance of chemisorbed oxygen and the great activity of Mn3+ besides Mn4+ in the catalyst.

Selective catalytic reduction

Mercury

10.1021/acs.energyfuels.8b02518

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Citations (53)

A Study on English Proficiency of University Graduates and Its Influencing Factors Based on the 3E Model

Chuanlan Tang Junying Zhang

In recent years, the international and domestic political and economic situation is changing rapidly, China's international status has been improved to a greater extent, and international exchanges and cooperation are more active than ever.This has also put forward new requirements for English proficiency and talent training in our universities.Based on this, this study examines the development of university graduates' English language proficiency and its labour market returns.This study is based on the "3E" model of language proficiency, human capital theory and signalling theory, and takes graduates with a bachelor's degree or above and at least one year's work experience as the subjects of the study.The study adopts a mixed method of quantitative research supplemented by qualitative research to investigate the development of English language proficiency and its labour market returns.The study uses a mixed method of quantitative research and qualitative research to analyse the development of English language proficiency and its labour market returns.

10.2991/978-2-38476-004-6_19

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Kinetic Modeling of Direct Aqueous Mineral Carbonation Using Carbide Slag in a Stirred Tank Reactor

SSRN Electronic Journal (2021)

Endong Miao Xufan Zheng Zhuo Xiong Yongchun Zhao Junying Zhang

Direct aqueous mineral carbonation by carbide slag at various temperatures, power inputs, superficial gas velocities, and CO 2 partial pressures in a stirred tank reactor were systematically studied. Based on the two-film theory , a novel kinetic model that exhibited extraordinary agreement with the experimental data was proposed to express the relationship between carbonation efficiency and reaction time. Carbonation efficiencies of more than 90% were achieved in all the experiments. The rate-controlling step of the reaction was gas-liquid mass transfer initially, although solid-liquid mass transfer was the rate-controlling step at the final stage. Changes in the mineralogy and morphology of the carbide slag before and after carbonation confirmed the reaction mechanism. The effect of various operating parameters on gas-liquid mass transfer was quantitatively investigated using an empirical equation. The present study contributes to the large-scale, rational utilization of energy, operation optimization of CO2 mineral carbonation in gas-liquid-solid reaction systems.

Slag (welding)

10.2139/ssrn.3954866

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Simultaneous NO Reduction and Hg⁰ Oxidation over La_0.8Ce_0.2MnO₃ Perovskite Catalysts at Low Temperature

Industrial & Engineering Chemistry Research (2018)

Jianping Yang Mingguang Zhang Hailong Li Wenqi Qu Yongchun Zhao

La1–xAxMn1–yByO3 (A = Ca, Sr and Ce, B = Cu, Co and Fe, x = 0/0.2, y = 0/0.2) perovskite catalysts were employed for simultaneous NO and Hg0 removal. The perovskite structure is beneficial for low temperature catalysis. The substitution of A-site cations with cerium (Ce) cations significantly improved the catalytic activity of perovskite catalyst. 90% NO conversion and 98% Hg0 oxidation was attained using La0.8Ce0.2MnO3 catalyst at 200 °C. Hg0 oxidation posed negligible effect on NO reduction. Compared to the N2 plus 4% O2 atmosphere, Hg0 oxidation was significantly facilitated by selective catalytic reduction atmosphere. The enhancement in Hg0 oxidation was probably attributed to NO2 originated from NO. Furthermore, a possible reaction mechanism was proposed, in which surface oxygen, Mn4+ and Ce4+ contributed to NO and Hg0 removal. Such knowledge provides useful information for the development of effective and economical NO and Hg0 removal technology for coal-fired power plants.

Selective catalytic reduction

Cerium oxide

Reducing atmosphere

10.1021/acs.iecr.8b01431

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Citations (46)

Emission controls of mercury and other trace elements during coal combustion in China: a review

International Geology Review (2017)

Yongchun Zhao Jianping Yang Siming Ma Shibo Zhang Huan Liu

Trace elements (TEs) in coal result in substantial pollutant emissions and cause serious damage to the ecological environment and human health in China. The emission and control of TEs, especially mercury, during coal combustion are of significant concern, and extensive studies have been performed in China in recent years. This paper reviews the emission characteristics and control strategies of mercury and other TEs during coal combustion in China. The occurrence of TEs in Chinese coals, including the average content of TEs in Chinese coals, the distribution of TEs in Chinese coals from different coal-forming periods, coal ranks, and coal-bearing regions are summarized. The emission characteristics of five specific TEs (Hg, As, F, Se, and Cr) during coal combustion in China are reviewed in detail. Effects of the coal type, combustion temperature, and combustion mode on the partitioning behaviour and emission characteristics of TEs are discussed. The effects of existing air pollution control devices of coal-fired power plants in China on the speciation and emission of TEs are discussed comprehensively. Various sorbents, such as activated carbon, fly ash, calcium-based sorbents, metal oxides, and mineral sorbents, used for TE removal are also summarized. Moreover, the removal performance of different sorbents for capturing certain TEs is compared comprehensively. Finally, future work for TE emission control in China is proposed.

Mercury

Clean coal technology

Trace element

10.1080/00206814.2017.1362671

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Citations (56)

Economic evaluation of mercury removal from flue gas by recyclable CuCl2 modified magnetospheres catalyst for 1000 MW coal-fired power plant

Energy Reports (2023)

Shuzhou Wei Tianle Zhang Junying Zhang Zhuo Xiong Yongchun Zhao

Economic sustainability is one of the main factors restricting development of mercury pollution control technology in the flue gas. Renewable magnetospheres separated from fly ash can be used as adsorbent for mercury removal from coal-fired flue gas. Based on the actual working condition of the 1000 WM coal-fired unit, this paper analyzes the impact of magnetosphere and mercury recovery technology on the economic benefits of this technology. The results show that the recovery of magnetospheres and mercury can obtain higher economic returns. This not only can realize the deduction of operating costs, but also has certain economic investment potential. When the magnetic separation rate is greater than 6% and the selling price of the magnetosphere is greater than 720 CNY/t, the revenue of the magnetosphere recovery system can offset the operating cost of whole system. The internal rate of return of the system can reach 50% at most. When the selling price of mercury selenide is lower than 450 CNY/g, the single mercury recovery income is insufficient to offset the mercury removal cost. Within the selling price range of 450–500 CNY/g mercury selenide, the system can generate revenue, and the product qualification rate directly affects the profit and loss of the system. The coupling of magnetospheres and mercury recovery systems can make economic and technical parameters more moderate. When the selling price of magnetospheres is higher than 600 CNY/t, the magnetic separation rate is higher than 6%, and the selling price of mercury selenide is higher than 350 CNY/g, the internal return of the system will fluctuate within 13%∼120%, and the static investment recovery period will remain within 6 years. Overall, this study can provide economic guidance for mercury removal technology with renewable magnetospheres and provide data support for further commercialization of technology.

Mercury

10.1016/j.egyr.2023.04.043

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Research progress of pollutants removal from coal-fired flue gas using non-thermal plasma

Renewable and Sustainable Energy Reviews (2016)

Siming Ma Yongchun Zhao Jianping Yang Shibo Zhang Junying Zhang

Nonthermal plasma

10.1016/j.rser.2016.09.066

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Citations (124)

Dual-parameter femtosecond mode-locking pulse generation in partially shared all-polarization-maintaining fiber Y-shaped oscillator with a single saturable absorber

Optics & Laser Technology (2023)

Chen Bai Ye Feng Weiguang Zhang Junying Zhang Tong Zhang

Saturable absorption

Bistability

Mode-Locking

10.1016/j.optlastec.2023.110021

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Study on the Performance and Mechanism of Morpholine Salt Volatile Corrosion Inhibitors on Carbon Steel

Coatings (2024)

Xiong Zhao Junying Zhang Lu Ma Wubin Wang Mingxing Zhang

A series of morpholine salt volatile corrosion inhibitors (VCIs) were synthesized via solid-phase chemical reactions. The corrosion inhibition performance was assessed using evaporation weight loss, VCI capability, and corrosion weight loss tests. The corrosion inhibition mechanisms of the morpholine salt VCIs for carbon steel in atmospheric conditions were explored through electrochemical testing under thin film electrolytes, X-ray photoelectron spectroscopy (XPS), and computational simulations. Morpholine carbonate exhibited higher volatility. Corrosion weight loss tests showed an >85% reduction for steel treated with morpholine benzoate or morpholine carbonate. The inhibitors’ inhibition mechanism, elucidated through X-ray photoelectron spectroscopy (XPS) and computational simulations, revealed that morpholine carbonate and benzoate form protective layers via physical and chemical adsorption on the steel surface, coordinating with iron atoms through nitrogen and oxygen atoms. Quantum chemical calculations demonstrated that morpholine carbonate had stronger adsorption energy and electron transfer capabilities, indicating superior corrosion inhibition performance over morpholine benzoate.

Morpholine

Carbon steel

10.3390/coatings14080997

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Citations (2)