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A new perspective on hydrogenation of CO2 into methanol over heterogeneous catalysts

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Progress in Natural Science:Materials International 2024年第3期34卷 482-494页

作者： Xueyuan Pan Jingcheng Xu Yali Wang Mingzhe Ma Haiquan Liao Hao Sun mengmeng fan Kui Wang Kang Sun Jianchun Jiang Key Lab.of Biomass Energy and Material Jiangsu Province Key and Open Lab.of Forest Chemical Engineering SFA National Engineering Lab.for Biomass Chemical Utilization Institute of Chemical Industry of Forest Products Chinese Academy of Forestry Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry University

The utilization of carbon dioxide is critical to realize the objective of "carbon peak and neutrality". Among various carbon dioxide exploitation approaches, catalytic hydrogenation of carbon dioxide is a significant method to selectively convert the CO2into methanol and other valuable chemicals. Among these products, methanol is a crucial chemical feedstock that can be utilized as a platform molecule for the synthesis of chemicals and fuels as well as a fuel for internal combustion engines and fuel cells, causing particular interest. Nowadays, Catalytic hydrogenation of carbon dioxide into methanol has shifted its focus on the creation of low-cost, environmentally friendly, and efficient catalysts. Inspired of this, we have concluded the mechanism of catalytic hydrogenation of carbon dioxide, and reviewed the research progress of multiple heterogeneous catalysts with high catalytic application prospect, especially the supported catalysts.

关键词： Carbon dioxide Heterogeneous catalyst Hydrogenation Methanol

Porous heterostructure of graphene/hexagonal boron nitride as an efficient electrocatalyst for hydrogen peroxide generation

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Carbon Energy 2023年第5期5卷 138-151页

作者： mengmeng fan Zeming Wang Yuying Zhao Qixin Yuan Jian Cui Jithu Raj Kang Sun Ao Wang Jingjie Wu Hao Sun Bei Li Liang Wang Jianchun Jiang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjingChina Key Lab of Biomass Energy and Material Jiangsu ProvinceJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesInstitute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjingChina School of Environmental and Chemical Engineering Institute of Nanochemistry and NanobiologyShanghai UniversityShanghaiChina Chemicobiology and Functional Materials Institute Nanjing University of Science and TechnologyNanjingChina Department of Chemical and Environmental Engineering University of CincinnatiCincinnatiOhioUSA

Compared with the traditional heteroatom doping,employing heterostructure is a new modulating approach for carbon-based electrocatalysts.Herein,a facile ball milling-assisted route is proposed to synthesize porous carbon materials composed of abundant graphene/hexagonal boron nitride(G/h-BN)heterostructures.Metal Ni powder and nanoscale h-BN sheets are used as a catalytic substrate/hard template and“nucleation seed”for the formation of the heterostructure,respectively.As-prepared G/h-BN heterostructures exhibit enhanced electrocatalytic activity toward H_(2)O_(2) generation with 86%-95%selectivity at the range of 0.45-0.75 V versus reversible hydrogen electrode(RHE)and a positive onset potential of 0.79 versus RHE(defined at a ring current density of 0.3 mA cm^(-2))in the alkaline solution.In a flow cell,G/h-BN heterostructured electrocatalyst has a H_(2)O_(2) production rate of up to 762 mmol g_(catalyst)^(-1) h^(-1) and Faradaic efficiency of over 75%during 12 h testing,superior to the reported carbon-based electrocatalysts.The density functional theory simulation suggests that the B atoms at the interface of the G/h-BN heterostructure are the key active sites.This research provides a new route to activate carbon catalysts toward highly active and selective O_(2)-to-H_(2)O_(2) conversion.

关键词： efficient electrocatalyst graphene H_(2)O_(2)generation hexagonal boron nitride porous heterostructure

师范生班级管理能力提升策略研究--以“班级管理与班主任工作”课程为例

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科教导刊 2024年第11期 140-142页

作者：樊萌萌西安思源学院基础教育学院陕西西安710038

班级管理能力是师范生教师职业技能的重要组成部分,本研究以“班级管理与班主任工作”课程为例,探讨当前师范生班级管理能力培养过程中存在的问题,并提出相应的提升策略,帮助师范生培养更强的班级管理能力和素养。

关键词：师范生班级管理能力班级管理与班主任工作

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Fabricating pyridinic N-B sites in porous carbon as efficient metal-free electrocatalyst in conversion CO_(2)into CH_(4)

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中国化学快报:英文版 2023年第8期34卷 291-295页

作者： Yuying Zhao Qixin Yuan mengmeng fan Ao Wang Kang Sun Zeming Wang Jianchun Jiang Institute of Chemical Industry of Forest Products Chinese Academy of ForestryKey Lab.of Biomass Energy and MaterialJiangsu ProvinceNational Engineering Lab for Biomass Chemical UtilizationNanjing 210042China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and Materials College of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China Institute of Nanochemistry and Nanobiology School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China

Electrochemical reduction of CO_(2)(CO_(2)RR)to value-added chemicals is an attractive strategy for greenhouse gas mitigation and carbon recycle.Carbon material is one of most promising electrocatalysts but its product selectivity is limited by few modulating approaches for active sites.Herein,the predominant pyridinic N-B sites(accounting for 80%to all N species)are fabricated in hierarchically porous structure of graphene nanoribbons/amorphous carbon.The graphene nanoribbons and porous structure can accelerate electron and ion/gas transport during CO_(2)RR,respectively.This carbon electrocatalyst exhibits excellent selectivity toward CO_(2)reduction to CH_(4)with the faradaic efficiency of 68%at−0.50 V vs.RHE.As demonstrated by density functional theory,a proper adsorbed energy of∗CO and∗CH_(2)O are generated on the pyridinic N-B site resulting into high CH_(4)selectivity.Therefore,this study provides a novel method to modulate active sites of carbon-based electrocatalyst to obtain high CH_(4)selectivity.

关键词： Carbon-based electrocatalyst Porous carbon Pyridinic N-B CO_(2)reduction CH_(4)selectivity

基于混合神经网络的网络数据传输中恶意攻击数据辨识

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长江信息通信 2024年第5期37卷 86-88页

作者：樊蒙蒙庞建成漯河职业技术学院现代教育技术中心河南漯河462000

传统的网络数据传输中恶意攻击数据辨识方法,只能经过一个训练周期,不能得到准确的恶意攻击数据辨识模型,导致正确分类恶意攻击数据文档数少,因此设计一种基于混合神经网络的网络数据传输中恶意攻击数据辨识方法。通过捕获目标网络数据... 详细信息

传统的网络数据传输中恶意攻击数据辨识方法,只能经过一个训练周期,不能得到准确的恶意攻击数据辨识模型,导致正确分类恶意攻击数据文档数少,因此设计一种基于混合神经网络的网络数据传输中恶意攻击数据辨识方法。通过捕获目标网络数据并进行数据清洗和预处理,提取恶意攻击数据的特征参数。通过对网络数据进行多个训练周期,得到准确的恶意攻击数据辨识模型。辨别恶意攻击数据时,可以根据流量异常、行为异常和文件异常等元素与预定阈值进行比较。实验证明,该方法准确性高,具有研究价值。

关键词：混合神经网络网络数据传输恶意攻击数据辨识

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基于多标签分类算法的网络通信端口流量异常值快速捕获

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长江信息通信 2024年第5期37卷 162-164页

作者：庞建成樊蒙蒙漯河职业技术学院现代教育技术中心河南漯河462000

由于网络通信端口流量状态具有实时更新的特征,导致异常值捕获的难度较大,为此,提出基于多标签分类算法的网络通信端口流量异常值快速捕获方法研究。通过对网络通信端口流量的统计特征(流量的大小、流量的方向、流量的协议类型)进行分... 详细信息

由于网络通信端口流量状态具有实时更新的特征,导致异常值捕获的难度较大,为此,提出基于多标签分类算法的网络通信端口流量异常值快速捕获方法研究。通过对网络通信端口流量的统计特征(流量的大小、流量的方向、流量的协议类型)进行分析和计算,为每个网络通信端口生成一组具有代表性的标签,利用GCN学习一组相互依赖的网络通信端口流量数据标签分类器,设计对应的分类器的输入由节点以及标签相关矩阵构成,具体的节点表示形式为网络通信端口流量数据标签的特征向量,网络通信端口流量数据标签对的出现次数作为建立相关矩阵的执行基础,分类器输出使用网络通信端口流量数据标签共现矩阵对应的条件概率矩阵为空时,确定此时的网络通信端口流量数据为异常值。在测试结果中,对端口流量异常值捕获结果的ACC始终稳定在0.85以上,对端口流量异常值捕获结果的F1-score始终稳定在0.83以上,与对照组的测试结果相比,具有明显优势。

关键词：多标签分类算法网络通信端口流量异常值快速捕获 GCN学习标签分类器

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肉豆蔻曲代替麸煨肉豆蔻组成方新二神丸的止泻作用研究

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中国实验动物学报 2024年第1期32卷 48-57页

作者：范蒙蒙张雨李红伟张振凌李凯河南中医药大学郑州450046 河南省中药特色炮制技术工程研究中心郑州450046 国家中医药管理局中药炮制传承基地郑州450046

目的基于脾肾阳虚泄泻小鼠模型探讨肉豆蔻曲配伍组成新二神丸的止泻作用。方法将KM小鼠随机分为正常组、模型组、二神丸Ⅰ组(盐补骨脂+麸煨肉豆蔻)、二神丸Ⅱ组(盐补骨脂+肉豆蔻曲)、二神丸Ⅲ组(盐补骨脂+肉豆蔻生品)、盐补骨脂组、肉... 详细信息

目的基于脾肾阳虚泄泻小鼠模型探讨肉豆蔻曲配伍组成新二神丸的止泻作用。方法将KM小鼠随机分为正常组、模型组、二神丸Ⅰ组(盐补骨脂+麸煨肉豆蔻)、二神丸Ⅱ组(盐补骨脂+肉豆蔻曲)、二神丸Ⅲ组(盐补骨脂+肉豆蔻生品)、盐补骨脂组、肉豆蔻曲组,采用“氢化可的松+番泻叶”的复合造模方法建立脾肾阳虚泄泻小鼠模型,观察各组小鼠一般体征、各脏器病理变化,检测小鼠各脏器指数、小肠推进率、胃残留率、血清胃动素(MTL)、胃泌素(GAS)、肾上腺酮(CORT)、促甲状腺激素(TSH)、睾酮(T)、肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)水平,对粪便微生物进行16S rDNA测序及信息分析。结果造模后,与正常组相比,模型组小鼠体重减轻,活动量减少,小肠推进率显著升高,胃残留率、各脏器指数均显著降低,血清GAS、CORT、TSH、T水平均显著下降,MTL、TNF-α、IL-β水平均显著上升,肠道菌群物种多样性降低;给药后,各给药组小鼠上述指标和症状均有不同程度改善,且二神丸Ⅱ组整体上优于二神丸Ⅰ组、二神丸Ⅲ组、盐补骨脂组及肉豆蔻曲组。结论肉豆蔻曲与盐补骨脂配伍使用对脾肾阳虚泄泻的作用效果显著,肉豆蔻发酵后能减少其毒性风险,增强其温脾止泻作用,为肉豆蔻曲的开发奠定基础。

关键词：肉豆蔻曲配伍脾肾阳虚泄泻

小学教育专业本科生农村就业意愿及其影响因素

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黑龙江科学 2024年第11期15卷 43-45页

作者：樊萌萌牛思雨西安思源学院西部乡村基础教育研究中心西安710038 宁夏平罗县城关第五小学宁夏石嘴山753400

通过问卷调查法和访谈法对小学教育专业本科生到农村就业的意愿及其影响因素进行分析。结果表明,小学教育专业本科生前往农村就业的意愿不强,未树立正确的农村就业观。大学生选择去农村就业的意愿深受传统就业观念影响,而且很大程度上... 详细信息

通过问卷调查法和访谈法对小学教育专业本科生到农村就业的意愿及其影响因素进行分析。结果表明,小学教育专业本科生前往农村就业的意愿不强,未树立正确的农村就业观。大学生选择去农村就业的意愿深受传统就业观念影响,而且很大程度上受父母意愿的影响。为此,学生个人应提高自我认识,树立正确的农村就业观。学生父母应及时转变传统就业观念,合理干预学生就业。学校应加强就业指导教育,积极开展就业指导工作。相关政府部门也应不断改善农村就业环境,加大农村就业政策的宣传力度。

关键词：小学教育专业本科生就业意愿就业观念就业环境

The modulating effect of N coordination on single-atom catalysts researched by Pt-N_(x)-C model through both experimental study and DFT simulation

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Journal of Materials Science & Technology 2021年第32期91卷 160-167页

作者： mengmeng fan Jiewu Cui Junjie Zhang Jingjie Wu Shuangming Chen Li Song Zixing Wang Ao Wang Robert Vajtai Yucheng Wu Pulickel MAjayan Jianchun Jiang Dongping Sun Nanjing Forestry University Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest ResourcesCollege of Chemical EngineeringNanjing 210037China Rice University Department of Materials Science and NanoEngineeringHoustonTX 77005USA Hefei University of Technology School of Materials Science and EngineeringHefei 230009China University of Cincinnati Department of Chemical and Environmental EngineeringCincinnatiOH 45221USA University of Science and Technology of China National Synchrotron Radiation LaboratoryCAS Center for Excellence in NanoscienceHefei 230026China Nanjing University of Science and Technology Chemicobiology and Functional Materials InstituteNanjing 210094China Key Lab of Biomass Energy and Material Jiangsu ProvinceJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesInstitute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China

N-doped carbon-based single-atom catalysts(NC-SACs) are widely researched in various electrochemical reactions due to high metal atom utilization and catalytic activity.The catalytic activity of NC-SACs originates from the coordinating structure between single metal site(M) and the doped nitrogen(N) in carbon matrix by forming M-N_(x)-C structure(1≤x≤4).The M-N4-C structure is widely considered to be the most stable and effective catalytic site.However,there is no in-depth research for the "x" modulation in Pt-Nx-C structure and the corresponding catalytic properties.Herein,atomically dispersed Pt on N-doped carbon(Pt-NC) with Pt-Nx-C structure(1≤x≤4),as a research model,is fabricated by a ZIF-8 template and applied to catalytic oxygen reduction.Different carbonization temperatures are used to control N loss,and then modulate the N coordination of Pt-Nx-C structure.The Pt-NC has the predictable low half-wave potential(E_(1/2)) of 0.72 V vs RHE compared to the Pt/C 20% of 0.81 V due to low Pt content.Remarkably,the Pt-NC shows a high onset potential(1.10 V vs RHE,determined for j=-0.1 mA cm^(2)) and a high current density of 5.2 mA cm^(-2),more positive and higher than that of Pt/C 20%(0.96 V) and 4.9 mA cm^(-2),respectively.As the structural characterization and DFT simulation confirmed,the reducing PtN coordination number induces low valence of Pt atoms and low free energy of oxygen reduction,which is responsible for the improved catalytic activity.Furthermore,the Pt-NC shows high mass activity(172 times higher than that of Pt/C 20%),better stability and methanol crossover resistance.

关键词： Modulating effect N coordination Single-atom catalysts Pt-N_(x)-C model DFT simulation