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Desorption hysteresis of coalbed methane and its controlling factors: a brief review

Frontiers of Earth Science 2021年第2期15卷 224-236页

作者： Weikai XU Junhui LI xiang wu Du LIU Zhuangsen WANG College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China China Coalbed Methane Co.Ltd Beijing 100011China

Most coal reservoirs show high gas content with relatively low desorption efficiency,which restricts the efficiency of coalbed methane(CBM)extraction and single-well *** review highlights the desorption hysteresis mechanism and its controlling factors as well as methods and models to reveal desorption hysteresis and potential *** adsorption and desorption can be recorded by both gravimetric and volumetric *** different adsorption models are used,desorption is generally considered with the Langmuir *** hysteresis is influenced by the petrophysical composition,thermal maturity,pore structure distribution of the coal,reservoir temperature,and moisture and water *** for calculating desorption hysteresis include the area index,hysteresis index and introduction of a hysteresis factor and a hysteresis *** dynamics simulations of methane desorption are mainly based on theories of kinetics,thermodynamics,and potential *** interaction forces operating among coal,water,and methane molecules can be calculated from microscopic intermolecular forces(van der Waals forces).The desorption hysteresis mechanism and desorption process still lack quantitative probe methodologies,and future research should focus on coal wettability under the constraints of liquid content,potential energy adjustment mechanism,and quantitative analysis of methane desorption *** research is expected to reveal the desorption kinetics of methane through the use of the solid–liquid–gas three-phase coupling theory associated with the quantitative analysis of methane desorption hysteresis,thereby enhancing the recovery rate and efficiency of CBM wells.

关键词： desorption hysteresis diffusion process kinetics multiphase coupling coalbed methane production

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Emerging CoMn-LDH@MnO2 electrode materials assembled using nanosheets for flexible and foldable energy storage devices

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Journal of Energy Chemistry 2020年第6期29卷 67-73,I0003页

作者： Yue Zhao Jiafeng He Meizhen Dai Depeng Zhao xiang wu Baodan Liu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina

CoMn layered double hydroxides(CoMn-LDH)are promising electrode materials for supercapacitors because of their excellent cyclic ***,they possess relatively low *** this work,hybrid CoMn-LDH@MnO2 products grown on Ni foams were obtained through a facile hydrothermal *** as-synthesized samples employed as electrodes deliver a specific capacitance of 2325.01 F g^-1 at 1 A g^-*** assembled asymmetric supercapacitor using these products as positive electrodes shows a maximum energy density of 59.73 W h kg^-1 at 1000.09 W kg^-*** prominent electrochemical performance of the as-prepared electrodes could be attributes to hierarchical *** findings suggest that hybrid structures might be potential alternatives for future flexible energy storage devices.

关键词： CoMn-LDH@MnO2 electrode Specific capacitance Flexible device Cyclic stability

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High valence state of Ni and Mo synergism in NiS_(2);MoS_(2)hetero-nanorods catalyst with layered surface structure for urea electrocatalysis

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Journal of Energy Chemistry 2022年第3期31卷 483-492,I0013页

作者： Shuli Wang Linyu Zhao Jiaxin Li Xinlong Tian xiang wu Ligang Feng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuChina State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228HainanChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina

High valence state species are significant in the energy-relevant electrochemical oxidation ***,the high active state of Ni^(3+)formation induced by Mo^(6+)and their efficient synergism in NiS_(2)-MoS_(2)hetero-nanorods powder catalyst with the rough layered structure are demonstrated,as proof of concept,for the urea-assisted water *** catalyst can be derived from the sulfidation of NiMoO_(4) nanorods that can realize individual metal sulfides sufficiently mixing at a domain size in the nanoscale which creates lots of active sites and *** high valence state of Mo^(6+)and Ni^(3+)formation and increased conductive phase of 1 T MoS_(2)in the hetero-nanorods compared to the counterpart pure phases are revealed by spectral study and microscopic analysis;high electrochemical surface area and active site exposure are found due to the nano-interface formation and layered rough nanosheets over the surface of *** show much higher catalytic performance than their pure phases for urea oxidation,including high catalytic activity,stability,charge transfer ability and catalytic kinetics resulting from more active Ni^(3+)species formation and electronic synergism of high valence *** of 1 T MoS_(2)to Mo^(6+)and increased amount of Mo^(6+)and Ni^(3+)after stability test indicate their involvement and synergism for the catalysis *** current work offers a novel understanding of the synergistic effect based on the high valence state synergism for heterogeneous catalysts in electrocatalysis.

关键词： Hetero-nanorods High valence state Urea oxidation NiS_(2) MoS_(2)

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Bifunctional ZnCo_(2)S_(4)/CoZn_(13) hybrid electrocatalysts for high efficient overall water splitting

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Journal of Energy Chemistry 2022年第6期31卷 292-300,I0009页

作者： Depeng Zhao Meizhen Dai Hengqi Liu Zhongxin Duan Xiaojie Tan xiang wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina

To develop highly active and low-cost electrocatalyst is very important to improve the efficiency of water ***,the current catalysts still present serious challenges due to the poor intrinsic activity and high ***,we report several amino induced Co-based composite *** a structure-mediating agent,ethylenediamine (EDA) can not only regulate the crystal structure and but also provide many surface amino *** obtained ZnCo_(2)S_(4)/CoZn_(13) catalysts show an excellent oxygen evolution reaction (OER) performance (274 mV@50 mA cm^(-2)) and the overpotential of 160 mV at-10 mA cm^(-2) for hydrogen evolution reaction (HER).For electrolysis of water,the electrocatalysts deliver a cell voltage of 1.61 V at 50 m A cm^(-2).This study provides a facile synthetic strategy to construct advanced electrocatalysts for future applications.

关键词： Electrocatalysts Hybrid structure Alloys Water splitting Durability

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Self-Microlensing in Compact Binary Systems

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Chinese Physics Letters 1997年第2期14卷 155-157页

作者： QIN Bo wu xiang-ping ZOU Zhen-long Beijing Astronomical Observatory Chinese Academy of SciencesBeijing 100080

The signature of the self-microlensing in compact binaries(white dwarfs,neutron stars and black holes)is a flare with the characteristic time of typically a few *** probability of detecting these microlensing events can be as high as 1/50 for a photometric accuracy of Δm=0.01 in *** discovery of the self-microlensing by binaries would furnish an additional way to find the masses of the lens and the companion,and will be promising for the searches of black holes.

关键词： stars magnitude black

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Advances in the Research of Strategies and Methods for Analyzing Complex Traits

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Agricultural Sciences in China 2008年第7期7卷 775-788页

作者： TANG Zai-xiang XU Chen-wu Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology~Key Laboratory of Plant Functional Genomics Ministry of Education~Yangzhou University Yangzhou 225009 P.R. China

Complex traits are the features whose properties are determined by both genetic and environmental factors. Generally, complex traits include the classical quantitative traits with continuous distribution, the binary or categorical traits with discrete distribution controlled by polygene and other traits that cannot be measured exactly, such as behavior and psychology. Most human complex diseases and most economically important traits in plants and animals belong to the category. Understanding the molecular basis of complex traits plays a vital role in the genetic improvement of plant and animal breeding. In this article, the conception and research background of complex traits were summarized, and the strategies, methods and the great progress that had been made in dissecting genetic basis of complex traits were reviewed. The challenges and possible developments in future researches were also discussed.

关键词： complex trait genetic basis genetic resource quantitative trait

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A fluorescent probe for Hg^(2+)sensing in solutions and living cells with a wide working pH range

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Chinese Chemical Letters 2014年第1期25卷 73-76页

作者： Zhi-xiang Han Bo-Song Zhu Tong-Liang wu Qing-Qing Yang Yong-Lai Xue Zhen Zhang xiang-Yang wu School of the Environment and Safety Engineering Jiangsu University State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan University

In this paper, 2-carboxybenzaldehyde rhodamine B thiohydrazine （1） was synthesized and developed as a fluorescent probe to recognize Hg2＋ in DMF/H2O （1：9, v/v） solution with high selectivity. The probe can be applied to the quantification of rig2＋ with a linear concentration range covering from 1.0 × 10^-7 mol/L to 1.0 × 10^-5 mol/L （R2 = 0.9985） and a detection limit of 4.2 × 10^-8 mol/L. The experiment results show that the response of probe 1 to Hg2＋ is pH-independent in a wide range from 4.0 to 9.0. Moreover, the probe 1 exhibits excellent selectivity toward Hg2＋ over other common metal cations. Most importantly, the probe can be employed to monitor Hg2＋ in living cells using fluorescent imaging technique with satisfied results.

关键词： Rhodamine Mercuric ions Fluorescent imaging

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Daily Variation of Natural Emission of Methane to the Atmosphere and Source Identification in the Luntai Fault Region of the Yakela Condensed Oil/Gas Field in the Tarim Basin,Xinjiang,China

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Acta Geologica Sinica(English Edition) 2007年第5期81卷 771-778页

作者： TANG Junhong BAO Zhengyu xiang wu GOU Qinghong Dept. of Environmental Engineering and Science Hongzhou Danzi University Hongzhou 310018 China Key Laboratory of Biogeology and Environmental geology of Ministry of Education China University of Geosciences Wuhan 430074 China Dept. of Earth Sciences Sun Yat-sen University Guangzhou 510275 China

The static flux chamber method was applied to study natural emissions of methane to the atmosphere in the Luntai fault region of Yakela Condensed Oil/Gas Field in the Tarim Basin, Xinjiang Municipality, northwestern China. Using an online method, which couples together a gas chromatography/high-temperature conversion/isotope ratio mass spectrometry （GC/C/MS）, 13^C/12^C ratios of methane in flux chambers were measured and showed that methane gases are liable to migrate from deep oil/gas reservoirs to the surface through fault regions and that a part of the migrated methane, which remains unoxidized can be emitted into the atmosphere. Methane emission rates were found to be highest in the mornings, lowest in the afternoons and then increase gradually in the evenings. Methane emission rates varied dramatically in different locations in the fault region. The highest methane emission rate was 10.96 mg/m^2·d, the lowest 4.38 mg/m^2, and the average 7.55 mg/ m^2·d. The 13^C/12^C ratios of the methane in the flux chambers became heavier as the enclosed methane concentrations increased gradually, which reveals that methane released from the fault region might come from thermogenic methane of the deep condensed oil/gas reservoir.

关键词： condensed oil/gas field fault-controlled methane emission carbon isotopes flux chamber Xinjiang

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Catalytic Performance of Modified HMCM-22 Catalysts in Xylene Isomerization

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Chinese Journal of Chemistry 2016年第12期34卷 1291-1296页

作者： xiang wu Chao Hu Guoqing Zhao Ying Yuan Zhirong Zhu Shanghai Key Lab of Chemical Assessment and Substainability School of Chemical Science and Engineering Tongji University Shanghai 200092 China

HMCM-22 catalysts modified with La203 （5% La） and MgO （≈0.87% Mg） were prepared respectively by impregnation method, and were characterized by scanning electron microscopy, X-ray diffraction, N2 physical ad- sorption-desorption and temperature-programmed desorption of NH3. The effect of supported metallic oxides （La203, MgO） on catalytic performance in xylene isomerization of C8 aromatics （ethylbenzene, m-xylene and o-xylene） was investigated in detail. The experimental results showed that 5% LaJHMCM-22 catalyst had higher isomerization activity and stronger shape-selectivity than 0.87% Mg/HMCM-22 catalyst, owing to its more acid sites and smaller pore size. And the loading amount of La was optimized to be about 7%. Moreover, supporting metal over 7% La/HMCM-22, respectively with 0.3% Pt, 3% Ni and 3% Mo, was carried out to prepare bifunction- al isomerization catalysts. In comparison, 3% Mo/7% La/HMCM-22 showed the best catalytic performance with both high activity and high selectivity, with the low hydrocracking of m-xylene and o-xylene. Besides, the op- timal reaction conditions were found： 340℃, 1.5 MPa H2, WHSV 4 h^-1 and H2/C8 4 mol/mol. Under the above conditions, ethylbenzene conversion was up to 20%, para-selectivity was over 23% with low xylene loss of 2.9%.

关键词： xylene isomerization HMCM-22 catalyst metallic oxide modification bifunctional catalyst

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Cuprous Chloride Nanocubes Grown on Copper Foil for Pseudocapacitor Electrodes

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Nano-Micro Letters 2014年第4期6卷 340-346页

作者： Bosi Yin Siwen Zhang Xin Zheng Fengyu Qu xiang wu Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of Education Harbin Normal University

In this paper, for the first time, we report the synthesis of nanoscale cuprous chloride(Cu Cl) cubic structure by a facile hydrothermal route. A possible mechanism for the growth of those nanostructures is proposed based on the experimental results. It is discovered that the existence of HCl could affect the surface of Cu Cl nanocubes. This unique cube-like nanostructure with rough surface significantly enhances the electroactive surface areas of Cu Cl, leading to a high special capacitance of 376 m F cm-2at the current density of 1.0 m A cm-2. There is still a good reversibility with cycling efficiency of 88.8 % after 2,000 cycles, demonstrating its excellent long-term cycling stability and might be the promising candidates as the excellent electrode material.

关键词： Cuprous chloride Nanocubes Electrochemistry Supercapacitor

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