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Frontiers of Chemical Science and Engineering 2010年第2期4卷 147-152页

作者： Weidong zhang yongfa zhang Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China

A kind of new catalyst-carbonaceous catalyst-for CH_(4)-CO_(2) reformation has been developed in our *** effect of both oxygen-bearing functional group such as phenolic hydroxyl,carbonyl,carboxyl,and lactonic,and ash such as Fe_(2)O_(3),Na_(2)CO_(3),and K_(2)CO_(3) in the carbonaceous catalyst on the CH_(4)-CO_(2) reforming has been investigated with a fixed-bed *** has been found that the carbonaceous catalyst is an efficient catalyst on CO_(2)-CH_(4) *** the decrease of oxygen-bearing functional group,the catalytic activity of carbonaceous catalyst decreases *** oxygen-bearing functional groups play a significant role in the carbonaceous-catalyzed CO_(2)-CH_(4) reforming;the ash components in carbonaceous catalyst also have an important influence on the CO_(2)-CH_(4) ***_(2)O_(3),Na_(2)CO_(3),and K_(2)CO_(3) in the ash can catalyze the CO_(2)-CH_(4) reforming reaction;CaO has little effect on CO_(2)-CH_(4) reforming *** can catalyze the gasification between carbonaceous catalyst and CO_(2);Al_(2)O_(3) and MgO inhibit the CO_(2)-CH_(4) reforming.

关键词： carbonaceous catalyst CH_(4)-CO_(2)eforming oxygen-bearing functional group ash

Catalytic performance of Co-Mo-Ce-K/γ-Al_(2)O_(3) catalyst for the shift reaction of CO in coke oven gas

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 457-460页

作者： Yuqiong ZHAO yongfa zhang Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China

The catalytic performance of Co-Mo-Ce-K/γAl_(2)O_(3) catalyst for the shift reaction of CO in coke oven gas is investigated using X-ray diffraction(XRD)and temperature-programmed reduction(TPR).The results indicate that Ce and K have a synergistic effect on promoting the catalytic activity,and the Co-Mo-Ce-K/γAl_(2)O_(3) catalyst with 3.0 wt-%CeO2 and 6.0 wt-%K_(2)O exhibits the highest ***2 favors Co dispersion and mainly produces an electronic *** characterization results indicate that the addition of CeO2-K_(2)O in the Co-Mo-Ce-K/γ-Al_(2)O_(3) catalyst decreases the reduction temperature of active components,and part of octahedrally coordinated Mo6+transforms into tetrahedrally coordinated Mo6+,which has a close relationship with the catalytic activity.

关键词： coke oven gas water gas shift reaction sulfurtolerant catalyst cerium dioxide

Mechanical anisotropy associated with beddings in shale under Brazilian test conditions:Insights from acoustic emission statistics

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第11期16卷 4462-4479页

作者： yongfa zhang Yinlin Ji Yu Zhao Qinglin Deng Chaolin Wang College of Civil Engineering Guizhou UniversityGuiyang550025China Helmholtz Centre Potsdam GFZ German Research Centre for GeosciencesPotsdam14473Germany State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resource and Safety EngineeringChongqing UniversityChongqing400044China

A comprehensive understanding of shale’s bedding anisotropy is crucial for shale-related engineering activities,such as hydraulic fracturing,drilling and underground *** this study,seven Brazilian tests were conducted on shale samples at different bedding orientations with respect to the loading direction(0°,45°and 90°)and the disc end face(0°,45°and 90°).An acoustic emission(AE)system was employed to capture the evolution of damage and the temporal-spatial distribution of microcracks under splitting-tensile *** results show that the Brazilian tensile strength decreases with increasing bedding inclination with respect to the disc end face,while it increases with the angle between bedding and loading *** the bedding inclination with respect to the end face facilitates the reduction in b value and enhances the shale’s resistance to microcrack growth during the loading *** between the bedding orientation and the end face suppresses the growth of mixed tensile-shear microcracks,while reducing the bedding angle relative to the loading direction is beneficial for creating mixed tensile-shear and tensile *** observed microscopic failure characteristics are attributed to the competing effects of bedding activation and breakage of shale matrix at different bedding *** temporal-spatial distribution of microcracks,characterized by AE statistics including the correlation dimension and spatial correlation length,illustrates that the fractal evolution of microcracks is independent of bedding anisotropy,whereas the spatial distribution shows a stronger *** evolution features of correlation dimension and spatial correlation length could be potentially used as precursors for shale splitting *** findings may be useful for predicting rock mass instability and analyzing the causes of catastrophic rupture.

关键词： Bedding anisotropy Acoustic emission(AE) Shale Brazilian test Rock failure mechanism Splitting-tensile cracks

Changes in behaviors of rats with sciatic nerve injury and expression of growth associated protein-43 in dorsal root ganglion

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Neural Regeneration Research 2006年第4期1卷 304-308页

作者： Chen Wang yongfa zhang Department of Anesthesiology Second Hospital of Xiamen City Xiamen 361021 Fujian Province China Department of Anesthesiology Second Affiliated Hospital of Shantou University Medical College Shantou 515041 Guangdong Province China

BACKGROUND： Neuropathic pain is closely related to neuroplasticity, and growth associated protein-43 （GAP 43） is a molecular marker for neuronal development and neuroplasticity. The expression of GAP-43 during the development of neuropathic pain should have its own characters. OBJECTIVE： To observe the changes in behaviors of rats with sciatic nerve injury and GAP-43 expression in dorsal root ganglion（DRG） affected ascribing to developing nerve transection and nerve crush, two types of neuropathic pain models. DESIGN： Randomized controlled animal experiment SETTING： Department of Anesthesiology in Second Hospital of Xiamen City and Second Affiliated Hospita of Shantou University Medical College. MATERIALS： Totally 250 adult Wistar rats of either gender, weighing 180 to 250 g, were involved in the study. The rats were randomized into 3 groups： nerve transection group （n =120）, nerve crush group （n =120）, and normal control group （n =10）. The rats in the nerve transection group and nerve crush group were subdivided separately into 6 groups,and were allowed to survive for 3, 7, 14, 21, 30 and 60 days after nerve injury （n =20）. Mouse anti-GAP-43 monoclonal antibody （Sigma Co.,Ltd.）, Supervision TM anti-mouse reagent （HRP, Changdao antibody diagnosis reagent Co.,Ltd., Shanghai）, DAB/H202 （Boster Co. Ltd, Wuhan）, and HMIAS-100 image analysis system （Qianping Image engineering Company, Tongji Medical University） were employed in this study. METHODS： This experiment was carried out in the Surgical Department and Pathological Laboratory, the Second Hospital Affiliated to Shantou Medical College during April 2004 to April 2005. （1） Grouping intervention： Animals were anesthetized and the sciatic nerve of the right side was exposed at thigh around ischial tuberosity. Sciatic nerves of rats in nerve transection group were transected at 1 cm below infrapiriform foramen, and those in nerve crush group were exposed as well as the nerve transection group, and crushed at

关键词： dorsal root ganglion nerve injury neuropathic pain sciatic nerve immunohistochemical method image analysis system monoclonal antibody animal experiment molecular marker measurement data result analysis survival time Wistar rats

Mutual impact of true triaxial stress, borehole orientation and bedding inclination on laboratory hydraulic fracturing of Lushan shale

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3131-3147页

作者： yongfa zhang Anfa Long Yu Zhao Arno Zang Chaolin Wang College of Civil Engineering Guizhou UniversityGuiyang550025China Helmholtz Centre Potsdam GFZ German Research Centre for GeosciencesPotsdam14473Germany

Unconventional resources like shale gas has been the focus of intense research and development for two decades. Apart from intrinsic geologic factors that control the gas shale productivity (e.g. organic matter content, bedding planes, natural fractures, porosity and stress regime among others), external factors like wellbore orientation and stimulation design play a role. In this study, we present a series of true triaxial hydraulic fracturing experiments conducted on Lushan shale to investigate the interplay of internal factors (bedding, natural fractures and in situ stress) and external factors (wellbore orientation) on the growth process of fracture networks in cubic specimens of 200 mm in length. We observe relatively low breakdown pressure and fracture propagation pressure as the wellbore orientation and/or the maximum in situ stress is subparallel to the shale bedding plane. The wellbore orientation has a more prominent effect on the breakdown pressure, but its effect is tapered with increasing angle of bedding inclination. The shale breakdown is followed by an abrupt response in sample displacement, which reflects the stimulated fracture volume. Based on fluid tracer analysis, the morphology of hydraulic fractures (HF) is divided into four categories. Among the categories, activation of bedding planes (bedding failure, BF) and natural fractures (NF) significantly increase bifurcation and fractured areas. Under the same stress regime, a horizontal wellbore is more favorable to enhance the complexity of hydraulic fracture networks. This is attributed to the relatively large surface area in contact with the bedding plane for the horizontal borehole compared to the case with a vertical wellbore. These findings provide important references for hydraulic fracturing design in shale reservoirs.

关键词： True triaxial hydraulic fracturing experiment In situ stress state Bedding planes Natural fractures Wellbore orientation Shale reservoirs

Effect of carbon deposition over carbonaceous catalysts on CH_(4)decomposition and CH_(4)-CO_(2)reforming

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 481-485页

作者： yongfa zhang Meng zhang Guojie zhang Huirong zhang Key Laboratory of Coal Science and Technology of Shanxi Province and Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China

An investigation was made using a continuous fixed bed reactor to understand the influence of carbon deposition obtained under different conditions on CH_(4)-CO_(2)***(TG)and X-ray diffraction(XRD)were employed to study the characteristics of carbon *** was found that the carbonaceous catalyst is an efficient catalyst in methane decomposition and CH_(4)-CO_(2)*** trend of methane decomposition at lower temperatures is similar to that at higher *** methane conversion is high during the initial of stage of the reaction,and then decays to a relatively fixed value after about 30 *** temperature increase,the methane decomposition rate increases *** reaction temperature has significant influence on methane decomposition,whereas the carbon deposition does not affect methane decomposition *** types of carbon deposition were formed at different methane decomposition reaction *** carbon deposition Type I generated at 900℃ has a minor effect on CH_(4)-CO_(2)reforming and it easily reacts with carbon dioxide,but the carbon deposition Type II generated at 1000℃and 1100℃clearly inhibits CH_(4)-CO_(2)reforming and it is difficult to react with carbon *** results of XRD showed that some graphite structures were found in carbon deposition Type II.

关键词： carbon deposition carbonaceous catalyst CH_(4)-CO_(2)reforming

Co-Ce-Ni Ternary Metal Oxide Modified N-activated Carbon:The Superior Low Temperature NH3-SCR Performance

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China Petroleum Processing & Petrochemical Technology 2021年第2期23卷 84-97页

作者： Wang Pei Li Yuan Liu Jun Liu Xiaoqing Tan Yingxin zhang yongfa School of Environmental and Safety Engineering North University of ChinaTaiyuan 030051 College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024 Beijing Institute of Mechanical Equipment Beijing 100854

Introducing reduced metal and nitrogen species is a powerful strategy to improve the reactivity of carbon-based materials for selective catalytic reduction of NO_(x) with NH_(3).To further improve the NH_(3)-SCR performance of non-pitch coal activated coke(NPAC),a series of metal oxides(e.g.,Co,Ce,and Ni)were loaded on nitrogen modified *** outstanding performance of NPAC-N-CoCeNi as well as the superior SO_(2)-and H_(2)O-tolerate performance are attributed to the extra electrons caused by the modification of N species,and these extra electrons are more conducive to the electron *** importantly,the interaction of the major active component Co^(3+)and the promoter catalysts CeO_(2),NiOx,or CoNiO_(2) can also increase the charge transfer and produce more oxygen vacancy and unsaturated chemical bonds,leading to improving the redox performance of *** addition,the NH3-SCR reaction is promoted after the metal oxides co-doping mainly via the Mars-van-Krevelen mechanism.

关键词： non-pitch coal activated coke nitrogen modification metal oxide loading NH_(3)-SCR

Tailoring Texture to Highly Strengthen AZ31 Alloy Plate in the Thickness Direction via Pre-tension and Rolling-Annealing

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 266-280页

作者： Tianjiao Li Jiang Zheng Lihong Xia Haoge Shou yongfa zhang Rong Shi Liuyong He Wenkai Li International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing400044China College of Mechanical Engineering Chongqing Technology and Business UniversityChongqing400067China Zhejiang Provincial Engineering Center of Integrated Manufacturing Technology and Intelligent Equipment Zhejiang University City CollegeHangzhou310015China

Conventional wrought Mg alloys,such as AZ31 and ZK60 rolled plates,usually exhibit significantly low tensile yield strength in the thickness *** can be attributed to the high activity of{10-12}tension twinning due to the strong basal texture(//ND,normal direction).In this work,the tensile yield strength in the ND of the as-rolled(AR)AZ31 plate increased from 50 to 150 MPa(increased by 200%)via simple processing,i.e.,pre-tension and rolling-annealing(PTRA)*** strong basal texture(//ND)of the AR plate was changed into a weakened fiber texture(⊥ND).The evolution of microstructures during PTRA treatment and the activated deformation modes during uniaxial tension were studied quantitatively and statistically by the means of intergranular misorientation(IM)and in-grain misorientation axes(IGMA)*** results indicate that various twin variants,as well as{10-12}-{10-12}secondary twins,were activated during pre-tension and rolling,and most residual matrix was consumed by twins after *** dominated deformation modes in tension changed from{10-12}tension twinning(the AR sample)to prismatic slip(the PTRA sample)in the early tensile *** underlying formation mechanism of the fiber texture and corresponding strengthening mechanism were discussed.

关键词： Pre-tension Annealing Tailoring texture Texture strengthening Deformation modes

Preparation of Solid Waste-Based Activated Carbon and Its Adsorption Mechanism for Toluene

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China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 100-110页

作者： Li Zhi Li Yunpeng Liu Jun Si Wenzhe zhang yongfa Li Junhua Taiyuan University of Technology College of Chemistry and Chemical EngineeringState Key Laboratory of Clean and Efficient Coal UtilizationTaiyuan 030024 Tsinghua University College of EnvironmentNational Engineering Research Center for Coordinated Control of Air Pollutants and Greenhouse GasesBeijing 100084 Zibo Pengda Environmental Protection Technology Co. Ltd.Zibo 255420

Regenerated activated carbon(RAC)samples were prepared by carbon activation using waste activated carbon from solid waste resources as the carbon source precursor coupled with adding alkaline additives,and then were further modified by potassium ferrate to finally prepare high-performance carbon for VOCs *** the same time,the samples before and after modification were systematically studied through characterization techniques such as SEM,Raman spectrometry,FT-IR,XPS,and dynamic/static *** results showed that the specific surface area and pore volume of the RAC after modification by the strong oxidant potassium ferrate increased by 1.4 times;the degree of defects was enhanced and the content of oxygen-containing functional groups on the surface increased *** them,the sample modified with potassium ferrate for 24 h had the best dynamic toluene adsorption performance(375.5 mg/g),and the dynamic adsorption capacity was twice that of the original sample(192.8 mg/g).The static adsorption test found that the maximum adsorption capacity of RAC-6%K_(2)FeO_(4)+H_(2)SO_(4)-24h was 796 mg/g,which indicated that the potassium ferrate modification treatment could significantly increase the VOCs adsorption performance of *** addition,through consecutive toluene adsorption-desorption cycle tests,it was found that the RAC-6%K_(2)FeO_(4)+H_(2)SO_(4)-24h sample still retained 91%of adsorption activity after the fifth regeneration *** indicates that RAC-6%K_(2)FeO_(4)+H_(2)SO_(4)-24h has good cycle stability and great application value for the efficient purification of industrial waste VOCs gas.

关键词： waste activated carbon toluene adsorption potassium ferrate modification oxygen-containing functional groups regeneration ability

Heteroatomic Modification of Solid-Waste-Based Mesoporous Carbon for Volatile Organic Compound Adsorption

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 66-78页

作者： Liu Jun Li Zhi Xu Ke zhang Xinyang Li Yunpeng Wang Ya zhang yongfa Yang Song Liu Shoujun Li Junhua College of Chemistry Taiyuan University of TechnologyTaiyuan 030024 State Key Joint Laboratory of Environment Simulation and Pollution Control National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and EquipmentSchool of EnvironmentTsinghua UniversityBeijing 100084 State Key Laboratory of Clean and Efficient Coal Utilization College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024 Shandong Pengda Ecological Technology Co. Ltd.ZiboShandong 255420 Taiyuan Green Coke Energy Co. Ltd.Taiyuan 030006

Solid-waste-based activated carbon(AC)was utilized as a carbon source to synthesize a series of carbon-based functional material RAC-X(X=P and S,where P and S denote phosphoric and sulfuric acids,respectively).The toluene adsorption capacities of the regeneration AC(RAC)samples can be significantly improved by adopting the heteroatomic modification ***-P and RAC-S have the same specific surface area(1156 m^(2)/g)and similar porous ***,they have different toluene adsorption capacities,with 316.22 mg/g for RAC-P and 460.12 mg/g for RAC-S,which are 1.6 and 2.4 times greater than that for *** X-ray photoelectron spectroscopy measurements showed that the increase in the amount ofπ–π^(2)chemical bond over the AC surface results in the improvement of the toluene adsorption *** density functional theory results showed that the S-containing functional groups loaded near the defect sites of RAC-S promote toluene ***,reusability tests showed that RAC-S still retains 86%of its adsorption activity after four consecutive adsorption–desorption *** indicates that the heteroatomic modification method affords excellent toluene adsorption performance and recycling practicability,which not only is beneficial for achieving the rational utilization of solid waste resources but also provides a practical method for the efficient elimination of volatile organic compounds.

关键词： waste activated carbon toluene adsorption heteroatomic modification functional groups DFT analysis