Article
Energy & Fuels
Xiuchao Yang, Jiaxun Liu, Xinyu Zhong, Yuanzhen Jiang, Xiumin Jiang
Summary: Efficient and low-cost oxidative desulfurization methods are crucial for advancing novel desulfurization technologies. This study quantitatively characterized sulfur distribution in mechanochemically activated and H2O2 oxidized coals, discussing the factors influencing sulfur transformation. The findings suggest that mechanochemical activation promotes the conversion from organic to inorganic sulfur, while optimal particle size and concentration can enhance sulfur removal efficiency.
Article
Energy & Fuels
Jiaxun Liu, Cuncheng Ma, Guoqing Chen, Xiuchao Yang, Xinyu Zhong, Jianguo Liu, Xiumin Jiang
Summary: NMR technology is used to study the structural information of all the products from the solvent extraction process. The results analyze the carbon skeleton characteristics and the effects of coal maturity, coal size, and solvent on carbon structural evolution. The study sheds light on understanding the coal structure and solvent extraction mechanisms.
Article
Energy & Fuels
Jiaxun Liu, Xinyu Zhong, Xiumin Jiang, Xue Jiang
Summary: This study investigated the free radical characteristics of coal during ultrafine grinding and solvent extraction processes, revealing that the free radical concentrations of extracts are lower than the raw coal. The impact of different reagents on free radical properties depends on their particle size and polarity, with higher polarity reagents able to extract more abundant molecular components.
Article
Energy & Fuels
Jiaxun Liu, Junfang Ma, Xiumin Jiang, Xue Jiang
Summary: The accurate description of complex multi-scale pore structures in coal is crucial for efficient coal utilization. This study focuses on the characterization of macropore geometry and topology in superfine pulverized coal using mercury intrusion porosimetry. The results show that pore geometry and topology have a significant impact on the permeability and compressibility of coal particles, providing valuable insights for understanding mass and heat transfer mechanisms and developing new clean coal utilization technologies.
Article
Energy & Fuels
Zining Zhou, Jiaxun Liu, Guoqing Chen, Xiuchao Yang, Xinyu Zhong, Jianguo Liu, Xiumin Jiang
Summary: In this study, synchrotron radiation-based small angle X-ray scattering (SAXS) was used to characterize the products of superfine pulverized coal during solvent extraction, focusing on pore structure (solid state) and aggregate configurations (liquid state) evolution. The results revealed that the fractal dimensions of pore surfaces were closely related to pore sizes and corresponding quantity distributions. The research also showed the extraction effect of different solvents on anthracite coal and bituminous coal, as well as the impact of particle size on extracted aggregate radii. Overall, the study provides insights into the molecular-level characterization of coal and residue pore structures and enhances understanding of solvent extraction mechanisms.
Article
Energy & Fuels
Yang Ma, Min Yan, Xiumin Jiang
Summary: This study investigates the influence of introduced O-containing groups on the formation pathways of nitrogenous gas during coal pyrolysis. It is found that the introduction of O-containing functional groups alters the formation pathways of nitrogenous gas, particularly through the oxidation of pyridinic and pyrrolic nitrogen.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Qihuang Huo, Yahui Wang, Huijun Chen, Yu Feng, Lina Han, Weiren Bao, Liping Chang, Jiancheng Wang, Kechang Xie
Summary: It is a win-win strategy to prepare mercury sorbents from low-cost high-sulfur raw materials. In this work, a two-step preparation method is developed to prepare mercury sorbents from high organic sulfur coal. The first step is the co-pyrolysis/carbonization of Fe2O3 and coal, converting organic sulfur into FeSx. The second step is KOH activation, converting FeSx into various S species. The prepared sorbents show excellent mercury removal performance.
Article
Green & Sustainable Science & Technology
Dongliang Wang, Wenliang Meng, Huairong Zhou, Yong Yang, Jiangpeng Xie, Siyu Yang, Guixian Li
Summary: Coal-to-methanol is an important technical route for methanol production, but it suffers from high CO2 emissions and low energy efficiency due to the mismatch in hydrogen-to-carbon ratio. This paper proposes a novel CTM process that introduces hydrogen production from renewable energy to meet the ratio, resulting in significantly reduced CO2 emissions and improved carbon utilization and energy efficiency. Economically, the novel process is feasible under certain hydrogen prices and carbon tax levels.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
Qihuang Huo, Yahui Wang, Huijun Chen, Yu Feng, Lina Han, Wei Xie, Jiancheng Wang, Weiren Bao, Liping Chang, Kechang Xie
Summary: A novel sulfur hybrid mercury sorbent was successfully prepared by chemically activating high inorganic sulfur coal using potassium hydroxide, which showed excellent mercury removal performance at high temperatures, high specific surface area, and adsorption capacity, as well as good resistance to various gases.
Article
Energy & Fuels
Yang Ma, Yan Gao, Xiumin Jiang
Summary: Superfine pulverization and chemical oxidation modification have significant synergistic effects on the introduction of O-containing functional groups, especially for anthracite samples. The addition of O-containing functional groups, such as carboxyl, was confirmed through C-13-NMR and FTIR experiments after 5 wt% peracetic acid modification. Thermogravimetric experiments showed that peracetic acid oxidation could increase the weight loss rate below 400 degrees C and reduce ignition temperatures. Pyrolysis experiments in the tube furnace proved that the amount of CO released increased and the commencing temperature decreased by 50 degrees C after the modification of peracetic acid. The generation paths of C2H4 and C6H6 changed, with new generation peaks appearing near 200 degrees C.
Article
Chemistry, Physical
Romualdus Enggar Wibowo, Raul Garcia-Diez, Marianne Van der Merwe, Daniel Duarte-Ruiz, Yang Ha, Roberto Felix, Anna Efimenko, Tomas Bystron, Martin Prokop, Regan G. Wilks, Karel Bouzek, Wanli Yang, Caterina Cocchi, Marcus Bar
Summary: The electronic properties of solid phosphorus compounds with varying oxidation states and chemical environments were investigated using X-ray absorption near-edge structure (XANES) spectroscopy. The experiments revealed shifts in absorption-edge positions correlated with the ligands surrounding the phosphorus atom. The XANES spectra calculations provided insights into the excitonic nature of the observed spectral features and their impact on the electronic structure. Furthermore, the XANES measurements on aqueous phosphorus-containing acids showed similar spectra to their solid counterparts, with slight red shifts and fewer spectral features, indicating potential for speciation and quantification through fingerprinting.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Environmental Sciences
Jun Shen, Jiaxun Liu, Shengxiang Deng, Sha Wang, Bin Chen, Xiumin Jiang
Summary: This study conducted detailed measurements of gaseous species during reburning process with high CO2 concentration using superfine pulverized coal in a bench-scale furnace. The findings suggest that superfine pulverized coal is more efficient in NO reduction in the homogeneous stage compared to the heterogeneous stage, and HCN and CH4 play a favorable role in NO abatement. Additionally, the oxygen consumption rate for superfine pulverized coal is relatively faster, which enhances both homogeneous and heterogeneous NO reduction under CO2 reburning condition.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2021)
Article
Engineering, Chemical
Zhenfeng Zhou, Ruihao Wang, Qiujie Yi, Guang Wang, Chunyuan Ma
Summary: The study proposed a targeted oxygen-enrichment technology to enhance coal combustion in an ironmaking blast furnace. Oxygen utilization and coal burnout were significantly increased under targeted oxygen-enrichment. However, the cooling effect of room-temperature oxygen had adverse effects on coal combustion. The study also found that the temperature of coal particles has a noticeable impact on coal combustion.
Article
Materials Science, Multidisciplinary
Sergey Kudryashov, Kirill Boldyrev, Alena Nastulyavichus, Dmitry Prikhod'ko, Sergey Tarelkin, Demid Kirilenko, Pavel Brunkov, Alexander Shakhmin, Kamil Khamidullin, George Krasin, Michael Kovalev
Summary: The silicon p-n junction photoelement fabricated with sulfur-based n-doping exhibits impurity-based near-far IR photoconductivity at liquid-helium temperatures. Temperature variations affect the IR photoconductivity, revealing different energy levels of sulfur centers in the material.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Metallurgy & Metallurgical Engineering
Junjie Wang, Shengli An, Yifan Chai, Xing Gao, Yanfeng Liang, Yici Wang, Jinzhou Liu
Summary: The influence of unburned pulverized coal in ironmaking on the viscosity of blast furnace slag was explored. The experiments studied the impact of temperature, volume fraction of solid particles and rotating speed on the viscosity of CaO-MgO-Al2O3-SiO2 heterogeneous slag. The relative viscosity calculation model of slag containing unburned pulverized coal was corrected. The results showed that the volume fraction of solid particles had a positive effect on the viscosity of the slag, while the rotating speed had a negative effect. The influence of unburned pulverized coal solid particles on the slag viscosity was larger than predicted.
IRONMAKING & STEELMAKING
(2023)