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Design and preliminary experimental research on a new biogas fermentation system by solar heat pipe heating

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International Journal of Agricultural and Biological Engineering 2016年第2期9卷 153-162页

作者： Jiao Youzhou Li Pengfei Li Gang Zhang Quanguo Ding Pan Wang Shaopeng Gao Zan Du Shuangli He Chao Key Laboratory of New Materials and Facilities for Rural Renewable energy Ministry of AgricultureCollege of Mechanical&Electrical engineeringHenan Agricultural UniversityZhengzhou 450002China collaborative innovation center of biomass energy Henan ProvinceZhengzhou 450002China

Biogas fermentation requires appropriate temperature,while the biogas fermentation can be affected by the low ambient temperature in *** order to overcome the negative effects of low temperature fermentation,a new type of solar heat pipe biogas fermentation heating system was designed and a preliminary experiment research on this system was conducted using cow manure as the raw material at 6%concentration and total fermentation volume of 175 *** experimental results showed that when the system was in normal operation,the fermentation temperature rose every day by *** gradient will gradually become smaller with the increase of fermentation liquid temperature,and the temperature can reach 38°C after *** this solar heat pipe heating system,the fermentation liquid temperature can be increased by 5°C every sunny *** solar heat pipe heating system plays a significant role in biogas *** results of economic analysis show that the system can realize the fermentation at constant temperatures of 25°C and 35°C respectively,and it can also save standard coal equivalent of 40 kg and 80 kg in winter and spring,respectively.

关键词： Biogas fermentation solar heat pipe heating system fermentation temperature economic analysis

Acoustic emission activity in directly tensile test on marble specimens and its tensile damage constitutive model

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International Journal of Coal Science & Technology 2018年第3期5卷 295-304页

作者： Ruifu Yuan Bowen Shi School of energy Science and Engineering Henan Polytechnic University Jiaozuo 454003 Henan China collaborative innovation center of Coal Work Safety of henan province Jiaozuo 454003 Henan China

For understanding acoustic emission （AE） activity and accumulation of micro-damage inside rock under pure tensile state, the AE signals has been monitored on the test of directly tension on two kinds of marble specimens. A tensile constitutive model was proposed with the damage factor calculated by AE energy rate. The tensile strength of marble was discrete obviously and was sensitive to the inside microdefects and grain composition. With increasing of loading, the tensile stress-strain curve obviously showed nonlinear with the tensile tangent modulus decreasing. In repeated loading cycle, the tensile elastic modulus was less than that in the previous loading cycle because of the generation of micro damage during the prior loading. It means the linear weakening occurring in the specimens. The AE activity was corresponding with occurrence of nonlinear deformation. In the initial loading stage which only elastic deformation happened on the specimens, there were few AE events occurred; while when the nonlinear deformation happened with increasing of loading, lots of AE events were generated. The quantity and energy of AE events were proportionally related to the variation of tensile tangent modulus. The Kaiser effect of AE activity could be clearly observed in tensile cycle loading. Based on the theory of damage mechanics, the damage factor was defined by AE energy rate and the tensile damage constitutive model was proposed which only needed two property constants. The theoretical stress-strain curve was well fitted with the curve plotted with tested datum and the two property constants were easily gotten by the laboratory testing.

关键词： Marble specimens Direct tensile test Acoustic emission Tensile tangent modulus Damage constitutive model

Biological Permeability Enhancement Technology for Coal Reservoir

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Acta Geologica Sinica(English Edition) 2017年第5期91卷 1938-1939页

作者： GUO Hongyu LIU Xile XIA Daping BAI Yang FU Chaoyong School of energy Science and Engineering Henan Polytechnic University Jiaozuo Henan 454000 China collaborative innovation center of Coalbed Methane and Shale Gas for Central Plains Economic Region Henan Province Jiaozuo Henan 454000 China

Objective Despite the adoption of various permeability enhancement technologies,the low permeability of coal reservoir has not been fundamentally improved for the development of coalbed methane（CBM）on the ground or ... 详细信息

关键词： Biological Permeability Enhancement Technology for Coal Reservoir

Large-scale synthesis of polyynes with commercial laser marking technology

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Chinese Physics B 2022年第12期31卷 425-428页

作者： Liang Fang Yanping Xie Shujie Sun Wei Zi collaborative innovation center of henan province for energy-Saving Building Materials Xinyang Normal UniversityXinyang 464000China Analysis&Testing center Xinyang Normal UniversityXinyang 464000China

The space-confined synthesis method has been an efficient way for the preparation of linear carbon ***,the large-scale preparation of linear carbon chains still faces many challenges due to the lack of methods for the large-scale synthesis of precursors,such as short carbon chains(polyynes),and regulation technology for the transport of reactants in one-dimensional ***,we report a facile method for the rapid preparation of polyynes in large quantities using a commercial laser marking *** characterizations show that a large number of polyynes,such as C_(8)H_(2),C_(10)H_(2),C_(12)H_(2),and C_(14)H_(2),can be produced by ablating the graphite plate immersed in the organic liquid using a laser marking *** results of in situ Raman spectroscopy investigation of C_(2n)H_(2)-filled single-walled carbon nanotubes further confirm that a variety of polyyne molecules are ***,in situ Raman spectroscopy also shows that the local heating treatment can accelerate the filling process of C_(2n)H_(2)into one-dimensional *** work provides new insights into the study of linear carbon chains and space-confined synthesis methods.

关键词： polyynes carbon chains single-walled carbon nanotubes

Ultrahigh lithiation dynamics of Li_(4)Ti_(5)O_(12)as an anode material with open diffusion channels induced by chemical presodiation

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稀有金属：英文版 2023年第2期42卷 471-483页

作者： Yong-Hui Zhang Zhou-Huan Nie Chen-Qiang Du Ji-Wei Zhang Jing-Wei Zhang National and Local Joint Engineering Research center for Applied Technology of Hybrid Nanomaterials Henan UniversityKaifeng475004China collaborative innovation center of Nano Functional Materials and Applications of henan province Henan UniversityKaifeng475004China

Spinel lithium titanate(Li_(4)Ti_(5)O_(12),LTO),with the merits of safety operation voltage,stable crystal structure,and minor lattice volume changes,becomes an optimal anode material for high-power Li-ion ***,the inherent wide bandgap and low lithiation reactivity of Li_(4)Ti_(5)O_(12)bring about poor conductivity and lithiation dynamics,limiting its further ***,we design and prepare unique Li_(4)Ti_(5)O_(12)anode materials with extremely low dopant content of Na^(+)utilizing the amorphous *** resultant Li_(4)Na_(0.008-)Ti_(5)O_(12.004)sample(denoted as NLTO-0.008)presents superior rate performances and cycle ability,with a reversible capacity of 149.4 mAh·g^(-1)at the current rate ***-0.008 retains the charge capacity of151.3 mAh·g^(-1)with a capacity loss of 0.5%after 1000cycles at the current rate of 1.0C(charge)/10.0C(discharge).The kinetic studies furtherly demonstrate that the lithiation reaction energy and diffusion energy barrier decrease by 28.8%and 30%,*** structure analysis indicates that Na^(+)occupies the 16d Li site and forms distorted LiO_(4)tetrahedron and TiO_(6)*** lattice distortion forms open diffusion channels,thus enhancing the Li^(+)diffusion dynamics and decreasing the lithiation reaction energy barrier for Li_(4)Ti_(5)O_(12).Therefore,the pre-sodiation strategy may arouse great interest in understanding and developing intercalation-type transitionmetal-based electrode materials in high-power lithium-ion batteries.

关键词： Lithium-ion batteries(LIBs) Anode material Lithium titanate Crystal structure Electrochemical performances

Effective conversion of cellobiose and glucose to sorbitol using non-noble bimetallic NiCo/HZSM-5 catalyst

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Science China Chemistry 2018年第9期61卷 1167-1174页

作者： Bakht Zada Long Yan Yao Fu Hefei National Laboratory for Physical Science at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) CAS Key Laboratory of Urban Pollutant Conversion Anhui Province Key Laboratory for Biomass Clean Energy and Department of Chemistry University of Science and Technology of China

The tandem hydrolysis and hydrogenation of saccharides into sorbitol is an especially attractive reaction in the conversion of biomass. Here, an economical and efficient bimetallic catalyst for the transformation of glucose and cellobiose into sorbitol is reported. Non-precious metal based catalysts such as NiCo, Ni, and Co, were prepared via modified impregnation method, and NiCo/HZSM-5 showed superior performance for the synthesis of sorbitol(86.9% from cellobiose, 98.6% from D-glucose).Various characterizations, such as Brunner-Emmet-Teler(BET), X-ray diffraction(XRD), transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS), confirmed that NiCo alloy formed and highly dispersed in NiCo/HZSM-5 catalyst. The high performance of fabricated catalyst would be attributed to the formation of nickel-cobalt alloy over HZSM-5 zeolite surface. High temperature and H_2 pressure were favorable for the tandem hydrolysis and hydrogenation reaction. Besides,the reaction pathway was also proposed based on the kinetics study. Cellobitol was detected as the intermediate in the reaction mixture. Furthermore, in the catalytic stability study, it was found that active metal species of NiCo/HZSM-5 were stable. The deactivation of catalyst would be due to the covering of acidic sites over NiCo/HZSM-5.

关键词： biomass sorbitol glucose cellobiose bimetallic catalyst

Nitrogen and sulfur co-doped graphene aerogel with hierarchically porous structure for high-performance supercapacitors

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Green energy & Environment 2020年第1期5卷 69-75页

作者： Zhiwei Lu Xiaochao Xu Yujuan Chen Xiaohui Wang Li Sun Kelei Zhuo collaborative innovation center of henan province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of Education School of Chemistry and Chemical Engineering Henan Normal University

Supercapacitors with unique performance have been widely utilized in many fields. Herein, we report a nitrogen and sulfur co-doped graphene aerogel(N/S-GA-2) prepared using a low toxic precursor for high-performance supercapacitors. The as-obtained material possesses a hierarchically porous structure and a large number of electrochemical active sites. At a current density of 1 Ag^-1, the specific capacitance of the N/S-GA-2 for supercapacitors with the ionic liquid as the electrolyte is 169.4 Fg^-1, and the corresponding energy density is 84.5 Wh kg^-*** a power density of 8.9 k W kg^-1, the energy density can reach up to 75.7 Wh kg^-1, showing that the N/S-GA-2 has an excellent electrochemical performance. Consequently, the N/S-GA-2 can be used as a promising candidate of electrode materials for supercapacitors with high power density and high energy density.

关键词： Graphene aerogel Hierarchically porous structure Supercapacitor Ionic liquid

Nitrogen-doped porous carbon nanosheets as both anode and cathode for advanced potassium-ion hybrid capacitors

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Green energy & Environment 2023年第2期8卷 579-588页

作者： Quanzhou Du Yuhua Zhao Yujuan Chen Jianming Liu Huanhuan Li Guangyue Bai Kelei Zhuo Jianji Wang collaborative innovation center of henan province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of EducationSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiangHenan453007China

Potassium-ion hybrid capacitors(PIHCs)as a burgeoning research hotspot are an ideal replacement for lithium-ion hybrid capacitors(LIHCs).Here,we report nitrogen-doped porous carbon nanosheets(NPCNs)with enlarged interlayer spacing,abundant defects,and favorable mesoporous *** structural changes of NPCNs in potassiation and depotassiation processes are analyzed by using Raman spectroscopy and transmission electron *** to the unique structure of NPCNs,the PIHC device assembled using NPCNs as both the anode and cathode material(double-functional self-matching material)exhibits a superior energy density of 128 Wh kg^(-1)with a capacity retention of 90.8%after 9000 *** research can promote the development of double-functional self-matching materials for hybrid energy storage devices with ultra-high performance.

关键词： Potassium-ion Porous carbon Hybrid capacitor energy storage Nitrogen-doping

Anionic structural effect in liquid–liquid separation of phenol from model oil by choline carboxylate ionic liquids

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Green energy & Environment 2019年第2期4卷 131-138页

作者： Zhiyong Li Ruipeng Li Xiaoqing Yuan Yuanchao Pei Yuling Zhao Huiyong Wang Jianji Wang collaborative innovation center of henan province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and ReactionsMinistry of Education School of Chemistry and Chemical Engineering Henan Normal University henan Key Laboratory of Green Chemistry Henan Normal University

Phenolic compounds exist in crude oil as pollutants, and their removal is vital important for the refining and further application of oils. In traditional separation approaches, strong acid and strong base have to be used to remove these compounds, which may cause serious environmental problems. In this work, 19 kinds of cholinium ionic liquids have been developed to separate phenol from model oil by liquid–liquid extraction. Structural effect of anions of the ionic liquids in the separation is systematically investigated. It is found that depending on the chemical structure of ionic liquids, phenol can be removed from toluene with single-step removal efficiency from 86 to 99% under optimal conditions. The type of substituent groups and the-CH_2 number between two carboxylates have obvious effect on the removal efficiency, and more hydrophilic ionic liquids have a stronger extraction performance for phenol. Furthermore, thermodynamic,^(13) C NMR,~1 H NMR and density functional theory calculations have been performed to characterize the extraction process and to understand the extraction mechanism. It is shown that the extraction of phenol from oil to ionic liquid is a favorable process, and this process is mainly driven by enthalpy change. The formation of the hydrogen bond between anion of the ionic liquid and-OH of phenol is the main driving force for the extraction of phenol from oil to the ionic liquids.

关键词： Ionic liquid Extraction Phenol Choline Hydrogen bonding