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A facile preparation of hausmannite as a high-performance catalyst for toluene combustion

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Chinese Journal of Chemical Engineering 2022年第4期35卷 392-401页

作者： Qi Liu Gao Cheng Ming Sun Weixiong Yu Xiaohong Zeng shichang tang Yongfeng li Lin Yu School of Chemical Engineering and Light Industry Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher EducationGuangzhou Key Laboratory of Clean Transportation Energy ChemistryGuangdong University of TechnologyGuangzhou 510006China

Mesoporous transition metal oxide catalysts are well-used in the elimination of volatile organic compounds.In this study,we developed an efficient method for the preparation of mesoporous-Mn_(3)O_(4)(mMn_(3)O_(4))without the use of templates or surfactants.In this method,KCl protects oxygen defects on the surface of fresh Mn_(3)O_(4) crystallites.m-Mn_(3)O_(4) shows higher ameliorative catalytic activity than bulk-Mn_(3)O_(4)(b-Mn_(3)O_(4)) and calcined-Mn_(3)O_(4)(c-Mn_(3)O_(4)),achieving toluene catalytic oxidation of T_(10) and T_(90)(the temperature at a conversion rate of about 10%and 90%)at 191℃and 230℃,respectively(WHSV=40,000 ml·g^(-1)·h^(-1)).Based on various characterizations,the prepared m-Mn_(3)O_(4)has large specific surface area and abundant oxygen defects,and thus can provide more surface active sites,which give it superior toluene combustion activity.

关键词： Catalysis Nanomaterials Environment Toluene Solvents Mn_(3)O_(4)

前驱体转化法可控制备γ-二氧化锰及其催化燃烧甲苯性能

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无机盐工业 2022年第6期54卷 134-141页

作者：唐诗昌程高刘琪叶凡孙明余林广东工业大学轻工化工学院广东省教育厅清洁化学技术重点实验室广东广州510006

采用前驱体转化法将四氧化三锰分别与硝酸、硫酸、醋酸进行歧化反应,制备了3组γ-二氧化锰催化剂(Mn-N、Mn-S、Mn-A),研究了不同酸对产物结构和形貌的影响。通过X射线衍射(XRD)、扫描电镜(FE-SEM)、透射电镜(HR-TEM)、氮气吸附-脱附、X... 详细信息

采用前驱体转化法将四氧化三锰分别与硝酸、硫酸、醋酸进行歧化反应,制备了3组γ-二氧化锰催化剂(Mn-N、Mn-S、Mn-A),研究了不同酸对产物结构和形貌的影响。通过X射线衍射(XRD)、扫描电镜(FE-SEM)、透射电镜(HR-TEM)、氮气吸附-脱附、X射线光电子能谱(XPS)、氢气程序升温还原(H_(2)-TPR)和氧气程序升温脱附(O_(2)-TPD)等表征方法系统分析了各产物的物化性质,并采用甲苯催化燃烧作为探针反应用于评估γ-二氧化锰催化剂的活性。结果表明,经硝酸处理得到的催化剂Mn-N具有最佳的甲苯催化燃烧活性,在质量空速为40000 mL/(g·h)条件下,起燃温度T_(10)(对应转化率为10%)为190℃,完全燃烧温度T_(90)(对应转化率为90%)为229℃。这可能与其具有较大比表面积、较高的锰(Ⅲ)和吸附氧物种含量、较好的可还原性和晶格氧流动能力有关。此外,经过连续30 h的稳定性实验,Mn-N仍可保持良好的催化活性。

关键词：前驱体转化四氧化三锰 γ-二氧化锰甲苯催化燃烧

电石渣对复合胶凝材料力学性能和微观结构的影响

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硅酸盐通报 2023年第9期42卷 3196-3203页

作者：陈友治吴修齐殷伟淞李万民汤世昌武汉理工大学硅酸盐建筑材料国家重点实验室武汉430070 南昌工程学院土木工程与建筑学院南昌330099 武汉理工大学道路桥梁与结构工程重点实验室武汉430070

电石渣作为一种Ca(OH)_(2)含量较高的工业副产品,可协同Na_(2)CO_(3)加速碱激发复合胶凝材料的水化过程。本文采用粉煤灰和矿粉作为复合胶凝材料的前驱体,探究不同电石渣(CCR)和Na_(2)CO_(3)质量比对复合胶凝材料的孔溶液pH值和力学性... 详细信息

电石渣作为一种Ca(OH)_(2)含量较高的工业副产品,可协同Na_(2)CO_(3)加速碱激发复合胶凝材料的水化过程。本文采用粉煤灰和矿粉作为复合胶凝材料的前驱体,探究不同电石渣(CCR)和Na_(2)CO_(3)质量比对复合胶凝材料的孔溶液pH值和力学性能影响。此外,通过水化热、X射线衍射、热重分析和扫描电子显微镜,探讨了CCR和Na_(2)CO_(3)协同激发作用对复合胶凝材料的水化过程和微观结构的影响。研究结果表明,随着CCR掺量的增加,复合胶凝材料的孔溶液pH值和力学性能均呈先增加后递减的趋势。当CCR和Na_(2)CO_(3)的掺量分别为6%和9%(质量分数)时,碱激发复合胶凝材料的3 d孔溶液pH值和28 d抗压强度分别达到最大值12.95和26.8 MPa。微观结构分析表明,在CCR和Na_(2)CO_(3)的协同激发作用下,碱激发复合材料能够生成更多的水化硅(铝)酸钙(C-(A)-S-H)凝胶,使得结构更加密实。

关键词：碳酸钠电石渣碱激发复合胶凝材料水化过程力学性能微观结构

制备方法对铈锰固溶体催化燃烧甲苯性能的影响

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中国粉体技术 2023年第4期29卷 138-149页

作者：陈世鸿唐诗昌庄檾希苏雅静黄俊诗凌伟钊黄文京程高李永峰广东工业大学轻工化工学院广东广州510006 广东工业大学广东省教育厅清洁化学技术重点实验室广东广州510006 广东绿园环保科技有限公司广东梅州514700 化学与精细化工广东省实验室揭阳分中心(榕江实验室) 广东揭阳515200

以甲苯为代表的挥发性有机化合物的排放,导致大气污染问题加剧。为了开发一种高效的用于甲苯催化燃烧反应的催化剂,采用水热法、热分解法和共沉淀法制备3种Ce_(0.7)Mn_(0.3)O_(2)样品,分别用于催化甲苯燃烧反应,并通过X射线衍射、扫描... 详细信息

以甲苯为代表的挥发性有机化合物的排放,导致大气污染问题加剧。为了开发一种高效的用于甲苯催化燃烧反应的催化剂,采用水热法、热分解法和共沉淀法制备3种Ce_(0.7)Mn_(0.3)O_(2)样品,分别用于催化甲苯燃烧反应,并通过X射线衍射、扫描电镜、透射电镜、氮气物理吸附-脱附、X射线光电子能谱、H_(2)程序升温还原、原位红外光谱测试对3种样品进行表征,探究制备方法对Ce_(0.7)Mn_(0.3)O_(2)催化剂结构、形貌、化学性质和催化燃烧甲苯性能的影响。结果表明:3种方法制备的Ce_(0.7)Mn_(0.3)O_(2)均为纳米颗粒;相较于其他2种方法,采用水热法制备的Ce_(0.7)Mn_(0.3)O_(2)具有更丰富的表面Mn3+、表面氧空位以及较强的低温可还原性,因此在甲苯催化燃烧反应中表现出良好的催化活性,在218℃时甲苯的转化率达到90%;此外,该样品具有优异的稳定性,在218℃下进行50h的稳定性测试后,仍能保持较高的甲苯转化率(约为90%);原位红外测试表明,水热法制备的Ce_(0.7)Mn_(0.3)O_(2)样品表面的催化燃烧甲苯反应遵循Marse-van Krevelen机制。

关键词：铈锰固溶体甲苯催化燃烧反应

Nitrogen doped porous carbon-based bifunctional oxygen electrocatalyst with controllable phosphorus content for zinc-air battery

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Nano Research 2023年第4期16卷 5887-5893页

作者： shichang Cai Zihan Meng Gaojie Li Yu An Yapeng Cheng Erjun Kan Bo Ouyang Haining Zhang Haolin tang School of Material Science and Engineering Henan University of TechnologyZhengzhou 450001China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong LaboratoryXianhu Hydrogen ValleyFoshan 528200China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Applied Physics and Institution of Energy and Microstructure Nanjing University of Science and TechnologyNanjing 210094China

The controllable construction of non-noble metal based bifunctional catalysts with high activities towards oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of great significance,but remains a challenge.Herein,we reported an effective method to synthesize cobalt-nitrogen doped mesoporous carbon-based bifunctional oxygen electrocatalyst with controllable phosphorus content(Co-N-P_(X)-MC,X=0.5,1.0,1.5,2.0).The mesoporous carbon substrate endowed the asprepared samples with more exposed active surface(236.50 m^(2)·g^(−1))and the most appropriate doping ratio of phosphorus had been investigated to be 1.5(Co-N-P1.5-MC).For ORR,Co-N-P1.5-MC exhibited excellent catalytic activity with more positive onset potential(1.01 V)and half-wave potential(0.84 V)than the other samples.For OER,Co-N-P1.5-MC also showed a low overpotential of 415 mV.Combining experimental results and density-functional theory(DFT)calculations,the outstanding bifunctional catalytic performance of Co-N-P1.5-MC was due to the synergistic cooperation between the P and N dopants,which could reduce the reaction barriers and was favorable for ORR and OER.Moreover,the Zn-air battery using Co-N-P1.5-MC as the cathode showed remarkable battery performance with high stability(could operate stably for over 160 h at 10 mA·cm^(−2))and maximum power density(119 mW·cm^(−2)),demonstrating its potential for practical applications.This work could provide significant enlightenment towards the design and construction of bifunctional oxygen electrocatalyst for next-generation electrochemical devices.

关键词： cobalt-nitrogen doped porous carbon phosphorus doping bifunctional electrocatalyst oxygen reduction reaction(ORR)and oxygen evolution reaction(OER) Zn-air battery

Release of Pb adsorbed on graphene oxide surfaces under conditions of Shewanella putrefaciens metabolism

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Journal of Environmental Sciences 2022年第8期34卷 67-75页

作者： Jianfeng Zhang shichangWei Zhenxing Liu Huang tang Xiaoguang Meng Weihuang Zhu Shaanxi Key Laboratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China Center for Environmental Systems Stevens Institute of TechnologyNJ 07030USA

In this study, Pb(Ⅱ) was used as a target heavy metal pollutant, and the metabolism of Shewanella putrefaciens(S. putrefaciens) was applied to achieve reducing conditions to study the effect of microbial reduction on lead that was preadsorbed on graphene oxide(GO) surfaces.The results showed that GO was transformed to its reduced form(r-GO) by bacteria, and this process induced the release of Pb(Ⅱ) adsorbed on the GO surfaces. After 72 hr of exposure in an S. putrefaciens system, 5.76% of the total adsorbed Pb(Ⅱ) was stably dispersed in solution in the form of a Pb(Ⅱ)-extracellular polymer substance(EPS) complex, while another portion of Pb(Ⅱ) released from GO-Pb(Ⅱ) was observed as lead phosphate hydroxide(Pb_(10)(PO_(4))_(6)(OH)_(2))precipitates or adsorbed species on the surface of the cell. Additionally, increasing pH induced the stripping of oxidative debris(OD) and elevated the content of dispersible Pb(Ⅱ)in aqueous solution under the conditions of S. putrefaciens metabolism. These research results provide valuable information regarding the migration of heavy metals adsorbed on GO under reducing conditions due to microbial metabolism.

关键词： Graphene oxide Pb(Ⅱ) Shewanella putrefaciens Extracellular polymeric substances Microbial reduction

地震叠后和叠前混合驱动下的页岩油储层多尺度裂缝预测方法

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地球物理学报 2024年第7期67卷 2830-2849页

作者：陈刚李世昌宋斯宇李映艳何吉祥唐廷明朱福玉赵杨卢明辉非常规油气科学技术研究院中国石油大学(北京)北京102249 中国石油新疆油田公司勘探开发研究院新疆克拉玛依834000 中国石油勘探开发研究院北京100083

不同尺度、不同类型的天然裂缝的系统性表征有利于识别优质储层、改进开发效果.建立可靠的多尺度裂缝模型是提高页岩油储层钻遇率的重要依据,其关键在于精细预测小尺度裂缝的空间分布,指导钻井钻进和压裂过程.然而,基于地震属性的传统... 详细信息

不同尺度、不同类型的天然裂缝的系统性表征有利于识别优质储层、改进开发效果.建立可靠的多尺度裂缝模型是提高页岩油储层钻遇率的重要依据,其关键在于精细预测小尺度裂缝的空间分布,指导钻井钻进和压裂过程.然而,基于地震属性的传统裂缝预测方法只能各自突出单一尺度的断裂,不同裂缝属性的数学独立性给综合裂缝系统的识别带来严峻挑战.我们提出一套改进的全尺度裂缝系统评估方案,其关键在于通过优化的各向异性蚁群裂缝识别算法确定小尺度裂缝的发育概率,将小尺度裂缝的发育概率与传统蚂蚁追踪产生的大尺度断层的概率进行融合,得到的综合裂缝系统可以实现全尺度裂缝的感知.详细的属性分析过程表明,方位各向异性能够精确描述微观裂缝特征.基于此,我们将各向异性分析得到的裂缝密度和裂缝走向融入蚁群追踪裂缝的各个阶段,在提高裂缝密集区搜索强度的同时,还对小断距裂缝的发育方向实现了精准刻画.针对页岩油藏的应用案例证明,根据改进方案得到的全尺度裂缝系统能够同时表征大尺度断层、小裂缝和裂缝破碎带的分布情况.研究区的成像测井结果进一步验证了小尺度裂缝预测发育方向的准确性及可靠性,能够为页岩油水平井开发部署提供理论指导.

关键词：天然裂缝页岩油储层方位各向异性多尺度裂缝蚂蚁追踪

An efficient bifunctional electrocatalyst derived from layer-by-layer self-assembly of a three-dimensional porous Co-N-C@graphene

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Science Bulletin 2019年第14期64卷 968-975页

作者： shichang Cai Rui Wang William M. Yourey Junsheng Li Haining Zhang Haolin tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China College of Engineering Penn State University Hazleton PA 18202 USA

Three-dimensional (3D) porous carbon-based materials with tunable composition and microstructure are of great interest for the development of oxygen involved electrocatalytic reactions. Here, we report the synthesis of 3D porous carbon-based electrocatalyst by self-assembling Co-metal organic frameworks (MOF) building blocks on graphene via a layer-by-layer technique. Precise control of the structure and morphology is achieved by varying the MOF layer to tune the electrocatalytic properties. The as-produced electrocatalyst exhibits an excellent catalytic activity for the oxygen reduction reaction in 0.1molL^-1 KOH, showing a high onset potential of 0.963V vs. reversible hydrogen electrode (RHE) and a low tafel slope of 54mVdec^-1, compared to Pt/C (0.934V and 52mVdec^-1, respectively). Additionally, it shows a slightly lower potential vs. RHE (1.72V) than RuO2 (1.75V) at 10mAcm^-2 in an alkaline electrolyte. A rechargeable Zn-air battery based on the as-produced 3D porous catalyst demonstrates a high peak power density of 119mWcm^-2 at a cell voltage of 0.578V while retaining an excellent stability over 250 charge-discharge cycles.

关键词： Oxygen reduction reaction Cobalt Three-dimensional Oxygen evolution reaction Graphene

The state-of-the-art of steel technology used for chinese power plants and its future

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Baosteel Technical Research 2010年第S1期4卷 88-页

作者： LIU Zhengdong,CHENG shichang,tang Guangbo,BAO Hansheng,YANG Gang and GAN Yong Central Iron and Steel Research Institute(CISRI),Beijing 100081,China

The development and construction of Ultra Super Critical(USC) fossil fired power plants and advanced nuclear power plants are the most important and effective issue to improve national electricity structure in China and to fulfill the national emission aim which had been proposed and promised.Further, steel technology is one of the most imperative fundamentals to ensure the development and construction of USC fossil fired power plants and advanced nuclear power plants.This paper briefly introduced the state-of-the -art and achievement of steel technology used for USC fossil fired power plants and advanced nuclear power plants in China so far.Meanwhile,the authors also analyzed and discussed the potential research and development plans of the important steel technology in China in the near future.

关键词： ultra super critical fossil fired power plant advanced nuclear power plant steel technology