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Cooperative effect between copper species and oxygen vacancy in Ce_(0.7−x)Zr_(x)Cu_(0.3)O_(2) catalysts for carbon monoxide oxidation

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Frontiers of Chemical Science and Engineering 2021年第6期15卷 1524-1536页

作者： Shan Wang Xuelian Xu Ping Xiao junjiang zhu Xinying Liu Institute for the Development of Energy for African Sustainability College of ScienceEngineering and TechnologyUniversity of South AfricaJohannesburg1710South Africa Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan430200China

The effects of Zr doping on the existence of Cu and the catalytic performance of Ce_(0.7−x)Zr_(x)Cu_(0.3)O_(2)for CO oxidation were *** characterization results showed that all samples have a cubic structure,and a small amount of Zr doping facilitates Cu^(2+) ions entering the CeO2 lattice,but excessive Zr doping leads to the formation of surface CuO crystals ***,the number of oxygen vacancies caused by the Cu^(2+) entering the lattice(e.g.,Cu^(2+)-□-Ce^(4+);□:oxygen vacancy),and the amount of reducible copper species caused by CuO crystals,varies with the Zr *** CO oxidation tests indicated that the oxygen vacancy and the reducible copper species were the adsorption and activation sites of O_(2)and CO,respectively,and the cooperative effects between them accounted for the high CO oxidation ***,the samples x=0.1 and 0.3,which possessed the most oxygen vacancy or reducible copper species,showed the best activity for CO oxidation,with full CO conversion obtained at 110℃.The catalyst is also stable and has good resistance to water during the reaction.

关键词： Ce-Zr-Cu-O CO oxidation reducible copper species oxygen vacancy cooperative effect

Perovskite Oxides La0.8Sr0.2Co1-xFexO3 for CO Oxidation and CO＋NO Reduction： Effect of Redox Property and Surface Morphology

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Chemical Research in Chinese Universities 2018年第1期34卷 119-126页

作者： YU Ke DIAO Tingting zhu junjiang ZHAO Zhen Institute of Catalysis for Energy and Environment College of Chemistry and Chemical Engineering Shenyang Normal University Shenyang 110034 P. R. China Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Educaaon South-central University for Nationalities Wuhan 430074 P. It China State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 P. R. China

This work aims to study the effect of redox property and surface morphology of perovskite oxides on the catalytic activity of CO oxidation and CO＋NO reduction, with the redox property being tuned by doping Fe at the Co site of La0.8Sr0.2Co1-xFexO3 and the surface morphology being modified by supporting La0.8Sr0.2CoO3 on various mesoporous silicas（i.e., SBA-16, SBA-15, MCF）. Characteristic results show that the Fe doping improves the match of redox potentials, and SBA-16 is the best support of La0.8Sr0.2CoO3 when referring to the oxidation ability（e.g., the Co^3＋/Co^2＋ molar ratio）. A mechanism for oxygen desorption from perovskite oxides is proposed based on O2-TPD experiments, showing the evolution process of oxygen released from oxygen vacancy and lattice framework. Catalytic tests indicate that La0.8Sr0.2CoO3 is the best for CO oxidation, and La0.8Sr0.2FeO3 is the best for CO＋NO reduction. The mechanism of CO＋NO reduction changes as the reaction temperature increases, with XNO/XCO value decreases from 2.4 at 250℃ to 1.0 at 400℃. As for the surface morphology, La0. Sr0.2CoO3 supported on SBA-16 possesses the highest surface Co^3＋/Co^2＋ molar ratio as compared to the other two, and shows the best activity for CO oxidation.

关键词： Perovskite oxide Redox property Surface morphology Mesoporous silica CO oxidation CO+NO reduction

Effect of preparation method on halloysite supported cobalt catalysts for Fischer-Tropsch synthesis

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Journal of Natural Gas Chemistry 2012年第4期21卷 426-430页

作者： Sufang Chen Jinlin Li Yuhua Zhang Daohong Zhang junjiang zhu School of Chemistry and Chemical Engineering Soochow UniversitySuzhou 215006JiangsuChina Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education South-Central University for NationalitiesWuhan 430073HubeiChina Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430073HubeiChina

Novel cobalt Fischer-Tropsch synthesis （FTS） catalysts were prepared from natural halloysite nanotubes （HNT） by double-solvent and wet- impregnation methods, and characterized by TEM, XRD, TPR and N2 adsorption-desorption. Comparing with the catalyst prepared by wet- impregnation method, the catalyst prepared by double-solvent method reduces Co3O4 particle migration and agglomeration due to size-induced effect, thus showing higher catalytic activity for Fischer-Tropsch synthesis.

关键词： Fischer-Tropsch synthesis halloysite nanotubes double-solvent method

Effect of preparation method on physicochemical properties and catalytic performances of LaCoO3 perovskite for CO oxidation

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Journal of Rare Earths 2019年第9期37卷 970-977,I0003页

作者： Shan Wang Xuelian Xu junjiang zhu Duihai Tang Zhen Zhao Institute of Catalysis for Energy and Environment College of Chemistry and Chemical EngineeringShenyang Normal University Shenyang 110034China College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan 430200China Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing Wuhan Textile UniversityWuhan 430200China

Perovskite oxides LaCoO3 prepared by templating,co-precipitation and sol-gel method with different complexants were systematically characterized and its catalytic performances for CO oxidation were *** samples were characterized by X-ray diffraction,thermogravimetry analysis and differential scanning calorimetry,N2 physisorption,transmission electron microscopy,temperature program reduction of hydrogen,temperature program desorption of oxygen and X-ray photoelectron spectroscopy measurement,results of which show that the properties of LaCoO3,such as surface morphology,surface area,surface compositions,redox capability,oxygen vacancy,as well as the calcination temperature and formation mechanism,depend intimately on the preparation *** tests indicate that the sample prepared by carbon templating method shows the best activity for CO oxidation,with full CO conversion obtained at 135℃.In particular,the catalyst can be activated and significant increase of activity can be obtained with the increase of reaction *** cyclic and longterm stability of catalysts were discussed and compared.

关键词： Perovskite oxides IaCoO3 Preparation method Physicochemical properties CO oxidation Rare earths

STUDY OF CH_4 AND CO OXIDATION FROM ELECTROCHEMICAL METHOD

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Chinese Science Bulletin 2006年第3期51卷 374-376页

作者： zhu junjiang YANG Xiangguang XU Xuelian WEI Kemei National Research Center of Chemical Fertilizer Catalysts Fuzhou University Fuzhou 350002 China Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China College of Chemistry & Chemical Engineering Fuzhou University Fuzhou 350002 China

CH4 and CO oxidation reaction on perovskite-like oxides La2-xSrxMO4 (0.0=x=1.0; M = Cu, Ni) was investigated from cyclic voltammetry method, finding that for suprafacial CO oxidation reaction, the catalyst activity has a close correlation to the area of redox peaks measured in the cyclic voltammetry, the larger the peak area is, the higher the activity will be, while for interfacial CH4 oxidation reaction, the activity depends mainly on the difference in redox potentials (?E), and the smaller the difference in redox potentials is, the higher the activity will be.

关键词：甲烷一氧化碳氧化反应电化学法钙钛矿氧化物催化剂

Carbon coated LaFe_(0.92)Pd_(0.08)O_(3) composites for catalytic transfer hydrogenation:Balance in the ability of substrates adsorption and conversion

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Nano Research 2024年第5期17卷 3724-3732页

作者： Bowen Wang Nan Zhang Ping Xiao Jian Zhang Sónia A.C.Carabineiro junjiang zhu Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430200China College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325035China LAQV-REQUIMTE Department of ChemistryNOVA School of Science and TechnologyUniversidade NOVA de LisboaLargo da Torre2829-516 CaparicaPortugal

Catalytic transfer hydrogenation(CTH)is a green and efficient pathway for selective hydrogenation of unsaturated aldehydes and ***,managing the abilities of solid catalysts to adsorb substrates and to convert them into desired products is a challenging ***,we report the synthesis of carbon coated LaFe_(0.92)Pd_(0.08)O_(3) composites(LFPO-8@C)for CTH of benzaldehyde(BzH)into benzyl alcohol(BzOH),using isopropanol(IPA)as hydrogen *** coating with carbon improves the ability to adsorb/transfer reactants from solution to active sites,and the doping of Pd2+at Fe3+site strengthens the ability of LaFeO_(3) to convert BzH into BzOH.A balanced point between them(i.e.,abilities to adsorb BzH and to convert BzH into BzOH)is obtained at LFPO-8@C,which exhibits a BzOH formation rate of 3.88 mmol·gcat^(-1)·h^(-1) at 180℃ for 3 h,which is 1.50 and 2.72 times faster than those of LFPO-8 and LaFeO_(3)@C.A reaction mechanism is proposed,in which the acidic sites(e.g.,Fe^(4+),oxygen vacancy)are used for the activation of C=O bond of BzH and O-H bond of IPA,and the basic sites(e.g.,lattice oxygen)for the activation ofα-H(O-H)bond of IPA.

关键词： LaFe_(0.92)Pd_(0.08)O_(3) porous carbon catalytic transfer hydrogenation isopropanol reaction mechanism

Characteristics of the crustal structure and hypocentral tectonics in the epicentral area of Nan＇ao earthquake （M7.5）, the northeastern South China Sea

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Chinese Science Bulletin 2006年第B12期51卷 95-106页

作者： XU Huilong QIU Xuelin ZHAO Minghui SUN Jinlong zhu junjiang Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Faculty of Earth Resources China University of Ge osciences Wuhan 430074 China

1918 Nan’ao earthquake (M7.5) occurred in the northeast coastal areas of Guangdong Province. With the seismogeological survey of the epicentral area and history materials analyses, the earthquake epicenter was estimated to locate in the intersection part of the Binhai fault zone (Littoral) and Huanggangshui fault, which strikes NEE and NW, respectively. The activities of the NEE-striking thrust fault and NW-striking extensional fault that were attributed to 1918 Nan’ao earthquake occurred in the Dongshan Island of the epicentral area; they reflected the focal stress field with compression in NW-SE direction and extension in NE-SW direction. The isoseismal contour of seismic intensity X shows a shape of ‘X’ composed of two mutually overlapping ellipses with two axes striking NEE and NW, respectively, and such shape implies that the occurrence of this earthquake is controlled by a pair of conjugate seismotectonic faults constituted by the NEE-striking Binhai fault zone and the NW-striking Huanggangshui fault. The Binhai fault zone is a dominant seismogenic structure, and the NW-striking Huanggangshui fault is the subdominant one. The onshoreoffshore deep seismic profile that crossed the epicentral area and was perpendicular to the strike of the Binhai fault zone was obtained. According to the analyses of the seismic data, the Binhai fault zone is defined as a low velocity zone with SE dip-slip in thecrustal structure section. The Binhai fault zone is a boundary fault between the South China subplate and South China Sea subplate. The crust structure on the northwest side of Binhai fault zone is a normal continental crust with a thickness of 30 km, and the one on the southeast side of the fault zone is a thinning continental crust with a thickness of 25―28 km. The Binhai fault zone is an important seismogenic fault and also is an earthquake-controlling fault. The intersection part between the Binhai fault zone and the low velocity zone of upper crust is advantageous to

关键词：南海东北部 1918年南澳地震滨海断裂带地壳结构震源构造震中区

Catalytic combustion of volatile organic compounds using perovskite oxides catalysts—a review

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1649-1676页

作者： Shan Wang Ping Xiao Jie Yang Sónia ACCarabineiro Marek Wiśniewski junjiang zhu Xinying Liu Institute for the Development of Energy for African Sustainability College of ScienceEngineering and TechnologyUniversity of South AfricaJohannesburg 1710South Africa Hubei Key Laboratory of Biomass Fibers and Eco-dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430200China LAQV-REQUIMTE Department of ChemistryNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516 CaparicaPortugal Physicochemistry of Carbon Materials Research Group Faculty of ChemistryNicolaus Copernicus University in Toruń87-100 ToruńPoland Zhijiang College of Zhejiang University of Technology Shaoxing 312030China

With the rapid development of industry,volatile organic compounds(VOCs)are gaining attention as a class of pollutants that need to be eliminated due to their adverse effects on the environment and human *** combustion is the most popular technology used for the removal of VOCs as it can be adapted to different organic emissions under mild *** review first introduces the hazards of VOCs,their treatment technologies,and summarizes the treatment mechanism ***,the characteristics and catalytic performance of perovskite oxides as catalysts for VOC removal are expounded,with a special focus on lattice distortions and surface defects caused by metal doping and surface modifications,and on the treatment of different *** challenges and the prospects regarding the design of perovskite oxides catalysts for the catalytic combustion of VOCs are also *** review provides a reference base for improving the performance of perovskite catalysts to treat VOCs.

关键词： perovskite oxides volatile organic compounds catalytic combustion reaction mechanism

Photocatalytic degradation of sulfadiazine in suspensions of TiO_(2)nanosheets with exposed(001)facets

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Chinese Chemical Letters 2021年第10期32卷 3215-3220页

作者： Xiaofan Xiang Laiyan Wu junjiang zhu Jiazhou Li Xi Liao Hongcheng Huang Jiajie Fan Kangle Lv Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission College of Resources and Environmental ScienceSouth-Central University for NationalitiesWuhan 430074China Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhan 430200China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Antibiotics such as sulfonamides are widely used in agriculture as growth promoters and medicine in treatment of infectious ***,the release of these antibiotics has caused serious environmental *** this paper,photocatalytic oxidation technology was used to degrade sulfadiazine(SDZ),one of the typical sulfonamides antibiotics,in UV illuminated TiO_(2)*** was found that TiO_(2)nanosheets(TiO_(2)-NSs)with exposed(001)facets exhibit much higher photoreactivity towards SDZ degradation compared to TiO_(2)nanoparticles(TiO_(2)-NPs)with a rate constant increases from0.017 min^(-1)to 0.035 min^(-1),improving by a factor of *** the attacking of reactive oxygen species(ROSs)such as superoxide radicals(*O_(2)^(-))and hydroxyl radicals(*OH),SDZ was steady degraded on the surface of TiO_(2)-*** on the identification of the produced intermediates by LC–MS/MS,possible degradation pathways of SDZ,which include desulfonation,oxidation and cleavage,were put *** UV irradiation for 4 h,nearly 90%of the total organic carbon(TOC)can be removed in suspensions of TiO_(2)-NSs,indicating the mineralization of ***_(2)-NSs also exhibits excellent stability in photocatalytic degradation of SDZ in wide range of *** after recycling used for 7 times,more than 91.3%of the SDZ can be efficiently removed,indicating that they are promising to be practically used in treatment of wastewater containing antibiotics.

关键词： Sulfadiazine Antibiotics Photocatalytic degradation TiO_(2)nanosheets Degradation pathway