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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

Microseismic observations reveal that internal waves intensify seabed methane release

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Science China Earth Sciences 2024年

作者： Zhaoyang TIAN Yonggang JIA junjiang zhu Tian CHEN Hui WANG Chunsheng JI Chengyu LIU Longyu LU Manchao HE Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of China Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of China Guangzhou Marine Geological Survey Shandong Earthquake Agency State Key Laboratory for Tunnel Engineering China University of Mining and Technology (Beijing)

Internal waves transport material and energy from the upper water column to the deep ocean, disturbing seabed sediments and resulting in phenomena such as seabed erosion and changes in topography. On the northern slope of the South China Sea and in many coastal margins worldwide, the zones with internal wave action closely overlap with areas where natural gas hydrates are present. However, due to significant differences in the spatial and temporal scales, understanding the influence of internal waves on methane releases from deep seabeds is challenging. In this study, in situ observations of seabed microseismicity and internal waves are conducted at water depths of 655 meters and 1450 meters in the Pearl River Canyon of the South China Sea. The microseismicity caused by internal waves and seabed methane releases is identified, and a method to establish the correlation between internal waves and seabed methane releases through the use of microseismic recordings is proposed, aiming to obtain direct observational evidence of internal waves intensifying seabed methane releases. The results show that internal waves and seabed methane releases generate significant microseismic signals, indicating the continuous influence of internal waves on the deep seabed of the northern slope of the South China Sea and revealing active methane release phenomena on the seabed. At both long and short time scales, internal waves increase the frequency of seabed methane releases by 4.2 times and 2.4 times, respectively, while also enhancing the intensity of these releases. These changes are influenced by the alterations in seabed flow velocity, pressure, and temperature that are induced by internal wave activities. This study emphasizes that microseismic signals are effective carriers of information for multiscale geological processes on seabeds and suggests that internal waves exacerbate marine geological hazards and contribute to global climate change by intensifying seabed methane relea

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揭示D-A聚合物光催化剂中的超快激子分离

Chinese Journal of Catalysis 2024年第4期59卷 4-6页

作者：朱君江张淑敏赫荣安武汉纺织大学化学与化工学院生物质纤维与生态染整湖北省重点实验室湖北武汉430200 长沙学院应用环境光催化湖南省重点实验室湖南长沙410022

近年来,具有给-受体结构的有机半导体聚合物在光催化领域中取得了显著的研究进展.研究主要集中在通过分子设计,采用自下而上的方法,合成具有不同分子结构的聚合物材料.研究人员深入考察了聚合物光催化性能与其自身性质(如能带结构、形... 详细信息

近年来,具有给-受体结构的有机半导体聚合物在光催化领域中取得了显著的研究进展.研究主要集中在通过分子设计,采用自下而上的方法,合成具有不同分子结构的聚合物材料.研究人员深入考察了聚合物光催化性能与其自身性质(如能带结构、形貌、吸光能力等)之间的关系.尽管这些研究为光催化领域的发展提供了重要基础,但现有研究方法仍存在一些问题,如自下而上合成路线的规模化应用困难,以及性能与结构关系研究的普适性不足.因此,未来研究需要进一步探索和改进合成方法,以及深化对光催化性能与材料结构之间关系的理解.中国地质大学(武汉)的余家国教授、张留洋教授与美国肯特州立大学的Mietek Jaroniec教授合作,采用傅克烷基化反应合成了具有给体-给体结构的聚合物.随后,通过后合成修饰,实现了该聚合物到给体-受体结构的原位光诱导转化,并系统地研究了转变前后聚合物中激子的分离过程.实验结果表明,在光照条件下,初始聚合物knitting DBT(KDBT)的结构单元二苯并噻吩(DBT)会部分氧化为二苯并噻吩-S,S-二氧化物(DBTSO),进而形成新聚合物KDBT-A,并伴随偶极矩增加和ICT态形成.瞬态技术(时间分辨荧光光谱和飞秒瞬态吸收光谱)表征结果表明,KDBT与KDBT-A中的激子都能发生解离,但KDBT-A中的激子解离速率要远快于KDBT.这表明ICT态的形成有效抑制了激子复合.因此,随着聚合物结构从给体-给体结构转变为给体-受体结构,其光催化活性得到了显著增强.综上,这种光诱导原位改变分子结构的方法不仅能促进给体-受体型聚合物光催化剂的发展,还为有机太阳能电池、有机发光二极管、传感器等多个领域的研究提供新策略.

关键词：光催化飞秒瞬态吸收给体-受体偶极矩聚合物

Electrocatalytic synthesis of C-N coupling compounds from CO_(2) and nitrogenous species

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SusMat 2024年第2期4卷 51-74页

作者： Zheng Zhang Danyang Li Yunchuan Tu Jiao Deng Huiting Bi Yongchao Yao Yan Wang Tingshuai Li Yongsong Luo Shengjun Sun Dongdong Zheng Sónia A.C.Carabineiro Zhou Chen junjiang zhu Xuping Sun Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&Finishing College of Chemistry and Chemical EngineeringWuhan Textile UniversityWuhanHubeiChina School of Chemistry and Chemical Engineering Chongqing UniversityChongqingChina i-Lab Vacuum Interconnected NanotechWorkstation(Nano-X)Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhouJiangsuChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuanChina College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinanShandongChina LAQV-REQUIMTE Department of ChemistryNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516 CaparicaPortugal College of Materials Xiamen UniversityXiamenFujianChina

The electrocatalytic synthesis of C-N coupling compounds from CO_(2) and nitrogenous species not only offers an effective avenue to achieve carbon neutral-ity and reduce environmental pollution,but also establishes a route to synthesize valuable chemicals,such as urea,amide,and *** innovative approach expands the application range and product categories beyond simple carbona-ceous species in electrocatalytic CO_(2) reduction,which is becoming a rapidly advancing *** review summarizes the research progress in electrocatalytic urea synthesis,using N_(2),NO_(2)^(-),and NO_(3)^(-)as nitrogenous species,and explores emerging trends in the electrosynthesis of amide and amine from CO_(2) and nitro-gen ***,the future opportunities in this field are highlighted,including electrosynthesis of amino acids and other compounds containing C-N bonds,anodic C-N coupling reactions beyond water oxidation,and the catalytic mechanism of corresponding *** critical review also captures the insights aimed at accelerating the development of electrochemical C-N coupling reactions,confirming the superiority of this electrochemical method over the traditional techniques.

关键词： C-N coupling CO_(2) reduction electrocatalysis nitrogenous species reaction mechanism

基于U-net-BiLSTM-CRF的心律失常多目标检测

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计算机应用与软件 2024年第4期41卷 142-150页

作者：王雨轩朱俊江黄浩濮玉中国计量大学机电工程学院浙江杭州310018

由于卷积滤波尺寸等限制,U-net无法学习到心电(Electrocardiographic,ECG)信号的长时序关联性以及标签间的相关性。对此提出一种基于U-net-BiLSTM-CRF的心律失常多目标检测方法,可同时输出目标心拍所属类型和位置信息。使用U-net学习融... 详细信息

由于卷积滤波尺寸等限制,U-net无法学习到心电(Electrocardiographic,ECG)信号的长时序关联性以及标签间的相关性。对此提出一种基于U-net-BiLSTM-CRF的心律失常多目标检测方法,可同时输出目标心拍所属类型和位置信息。使用U-net学习融合特征,再将其输入到双向长短时记忆网络(Bi-directional Long Short-Term Memory,BiLSTM)中学习长时序依赖特征,最后使用条件随机场(Conditional Random Field,CRF)对标签间的关系建模,优化分类结果。依据ANSI/AAMI EC57:2012的心搏分类标准,对MIT-BIH心律失常数据库中共85609个心拍记录进行划分,在划分后数据集上的实验结果表明,该方法对心拍分类的准确率达99.11%,特异性为99.76%,灵敏度为97.21%,优于传统U-net在MIT-BIH心律失常数据库上的分类性能。

关键词：心律失常检测 U-net 双向长短时记忆网络条件随机场

TiO_(2)-Ag_(2)S-rGO三元复合棉织物自清洁工艺

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针织工业 2024年第1期 47-48,49-51页

作者：欧阳泽宇姜会钰姚金波朱君江生物质纤维及生态染整湖北省重点实验室湖北武汉430200 武汉纺织大学化学与化工学院湖北武汉430200

为增强二氧化钛的光催化性能,用水热法制备TiO_(2)-Ag_(2)S-rGO三元复合物并将其整理到棉织物上,以赋予棉织物自清洁性能。对制备的三元复合物进行XRD分析,并对整理后的棉织物进行SEM分析。探究钛酸四丁酯的用量、合成温度、合成时间以... 详细信息

为增强二氧化钛的光催化性能,用水热法制备TiO_(2)-Ag_(2)S-rGO三元复合物并将其整理到棉织物上,以赋予棉织物自清洁性能。对制备的三元复合物进行XRD分析,并对整理后的棉织物进行SEM分析。探究钛酸四丁酯的用量、合成温度、合成时间以及体系pH值对三元复合物光催化性能的影响,并通过正交试验以得到最佳试验工艺。结果表明,三元复合物合成并成功附着在棉织物上;最佳试验工艺为:合成温度160℃、合成时间9 h、体系pH值为7以及钛酸四丁酯浓度为0.13 g/mL;光照4 h后,TiO_(2)-Ag_(2)S-rGO三元复合棉织物上的亚甲基蓝基本消失,验证了织物的自清洁性能。

关键词：自清洁 TiO_(2) Ag_(2)S 三元复合功能性整理

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

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