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high nitrogen carbon material with rich defects as a highly efficient metal-free catalyst for excellent catalytic performance of acetylene hydrochlorination

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Chinese Journal of Chemical Engineering 2021年第1期34卷 196-203页

作者： Fangjie Lu Dong Xu Yusheng Lu Bin Dai Mingyuan Zhu School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832000China Key Laboratory for Green Processing of Chemical Engineering Xinjiang Production and Construction CorpsShihezi 832000China

In this work,we developed a simple strategy to synthesize a carbon material with high nitrogen and rich carbon defects.Our approach polymerized diaminopyridine(DAP) and ammonium persulfate(APS).Following a range of different temperature pyrolysis approaches,the resulting rough surface was shown to exhibit edge defects due to N-doping on graphite carbon.A series of catalysts were evaluated using a variety of characterization techniques and tested for catalytic performance.The catalytic performance of the N-doped carbon material enhanced alongside an increment in carbon defects.The NC-800 catalyst exhibited outstanding catalytic activity and stability in acetylene hydrochlorination(C_(2) H_(2) GHSV=30 h^(-1),at 220℃,the acetylene conversion rate was 98%),with its stability reaching up to 450 h.Due to NC-800 having a nitrogen content of up to 13.46%,it had the largest specific surface area and a high defect amount,as well as strong C_(2) H_(2) and HCl adsorption.NC-800 has excellent catalytic activity and stability to reflect its unlimited potential as a carbon material.

关键词： Carbon defects material high nitrogen content Acetylene hydrochlorination Catalyst Chemical reaction Nanomaterials

Synthesis of high-quality ferrovanadium nitride by carbothermal reduction nitridation method

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Journal of Iron and Steel Research(International) 2021年第3期28卷 255-262页

作者： Ying-cong Zhou Yu Wang Kuo-chih Chou Guo-hua Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China

high-quality ferrovanadium nitride(FeV45N,FeV55N and Fe65N)was fabricated using the raw materials of Fe_(3)O_(4),V_(2)O_(5) and graphite via carbothermal reduction nitridation method.Compared with the traditional methods,it shortens the production process of ferrovanadium nitride by avoiding the preparation of ferrovanadium.The effects of C/O molar ratio and reaction temperature on phase transition,density,carbon,oxygen and nitrogen contents and microstructure were investigated.The appropriate C/O molar ratio is crucial to obtain the products with high nitrogen content.It is also found that a higher temperature is beneficial for the densification,and the density of the products obtained at 1550℃ is much higher than that at 1500℃.Moreover,a higher temperature contributes to the increase in nitrogen content owing to the higher reaction kinetics.The carbothermal reduction nitridation method is proved to be a facile route to fabricate cost-effective ferrovanadium nitride and is possible to be applied for industrial production.

关键词： Ferrovanadium nitride Carbothermal reduction nitridation high nitrogen content Densification

Geochemical characteristics and genetic mechanism of the high-N2 shale gas reservoir in the Longmaxi Formation, Dianqianbei Area, China

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Petroleum Science 2020年第4期17卷 939-953页

作者： Ji-Lin Li Ting-Shan Zhang Yan-Jun Li Xing Liang Xin Wang Jie-Hui Zhang Zhao Zhang Hong-Lin Shu Da-Qian Rao School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500SichuanChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu 610500SichuanChina ChuangYuan Oil and Gas Technology Development Co. LtdChengdu 610500SichuanChina PetroChina Zhejiang Oilfeld Company Hangzhou 310000ZhejiangChina PetroChina Huabei Oilfeld Company Renqiu 062550HebeiChina

As an important pilot target for shale gas exploration and development in China,the Longmaxi Formation shale in the Dianqianbei Area is characterized by high content of nitrogen,which severely increases exploration risk.Accordingly,this study explores the genesis of shale gas reservoir and the mechanism of nitrogen enrichment through investigating shale gas compositions,isotope features,and geochemical characteristics of associated gases.The high-nitrogen shale gas reservoir in the Longmaxi Formation is demonstrated to be a typical dry gas reservoir.Specifically,the alkane carbon isotope reversal is ascribed to the secondary cracking of crude oil and the Rayleigh fractionation induced by the basalt mantle plume.Such a thermogenic oil-type gas reservoir is composed of both oil-cracking gas and kerogen-cracking gas.The normally high nitrogen content(18.05%-40.92%) is attributed to organic matter cracking and thermal ammoniation in the high-maturity stage.Specifically,the high heat flow effect of the Emeishan mantle plume exacerbates the thermal cracking of organic matter in the Longmaxi Formation shale,accompanied by nitrogen generation.In comparison,the abnormally high nitrogen content(86.79%-98.54%) is ascribed to the communication between the atmosphere and deep underground fluids by deep faults,which results in hydrocarbon loss and nitrogen intrusion,acting as the key factor for deconstruction of the primary shale gas reservoir.Results of this study not only enrich research on genetic mechanism of high-maturity N_@ shale gas reservoirs,but also provide theoretical guidance for subsequent gas reservoir resource evaluation and well-drilling deployment in this area.

关键词： Longmaxi Formation Shale gas reservoir Isotope high nitrogen content Genetic mechanism

N-doped graphitic carbon encapsulating cobalt nanoparticles derived from novel metal–organic frameworks for electrocatalytic oxygen evolution reaction

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中国化学快报:英文版 2023年第8期34卷 472-477页

作者： Yuanmeng Tian Hao Wu Aamir Hanif Yanli Niu Ying Yin Yangyi Gu Zuofeng Chen Qinfen Gu Yun Hau Ng Jin Shang Liangchun Li Mingxian Liu Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and EngineeringTongji UniversityShanghai 200092China School of Energy and Environment City University of Hong KongHong Kong SAR 999077China City University of Hong Kong Shenzhen Research Institute Shenzhen 518000China Macao Institute of Materials Science and Engineering Faculty of Innovation EngineeringMacao University of Science and TechnologyMacao SAR 999078China Australian Synchrotron(ANSTO) Victoria 3168Australia

nitrogen-doped carbon catalysts with hierarchical porous structure are promising oxygen evolution reaction(OER)catalysts due to the faster mass transfer and better charge carrying ability.Herein,an exquisite high nitrogen-containing ligand was designed and readily synthesized from the low-cost biomolecule adenine.Accordingly,three new MOFs(TJU-103,TJU-104 and TJU-105)were prepared using the Co(II)or Mn(II)ions as metal nodes.Through rationally controlling pyrolysis condition,in virtue of the high nitrogen content in well-defined periodic structure of the pristine MOFs,TJU-104–900 among the derived MOFs with hierarchical porous structure,i.e.,N-doped graphitic carbon encapsulating homogeneously distributed cobalt nanoparticles,could be conveniently obtained.Thanks to the synergistic effect of the hierarchical structure and well dispersed active components(i.e.,C=O,Co–Nx,graphitic C and N,pyridinic N),it could exhibit an overpotential of 280 mV@10mA/cm^(2)on carbon cloth for OER activity.This work provides the inspiration for fabrication of nitrogen-doped carbon/metal electrocatalysts from cost-effective and abundant biomolecules,which is promising for practical OER application.

关键词： Metal-organic frameworks Oxygen evolution reaction high nitrogen content Cobalt nanoparticles Hierarchical structure