检索结果-南通市图书馆

cobalt anchored CN sheet boosts the performance of electrochemical co oxidation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第6期30卷 498-503页

作者： Xu Liu Jun-Chao Huang Xiang-Mei Duan School of Physical Science and Technology Ningbo UniversityNingbo 315211China

Single-atom catalysts(SACs) have attracted great interest due to their significant roles played in applications of environmental protection, energy conversion, energy storage, and so on. Using first-principles calculations with dispersioncorrection, we investigated the structural stability and catalytic activity of co implanted CN sheet towards co *** adsorption energy of co and O_(2) on the catalysts co@CN and 2 co@CN are close, thus preventing co *** three possible co oxidation mechanisms, termolecular Eley-Rideal is the most appropriate reaction path, and the corresponding rate-limiting reaction barriers of the two systems are 0.42 eV and 0.38 eV, respectively.

关键词： first-principles calculations single-atom catalyst co oxidation rate-limiting reaction barrier

Forced bursting and transition mechanism in co oxidation with three time scales

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第4期22卷 161-166页

作者：李向红毕勤胜 Faculty of Civil Engineering and Mechanics Jiangsu University Department of Mathematics and Physics Shijiazhuang Tiedao University

The mathematical model of co oxidation with three time scales on platinum group metals is investigated, in which order gaps between the time scales related to external perturbation and the rates associated with different chemical reaction steps exist. Forced bursters, such as point–point type forced bursting and point–cycle type forced bursting, are presented. The bifurcation mechanism of forced bursting is novel, and the phenomenon where two different kinds of spiking states coexist in point–cycle type forced bursting has not been reported in previous work. A double-parameter bifurcation set of the fast subsystem is explored to reveal the transition mechanisms of different forced bursters with parameter variation.

关键词： co oxidation forced bursting bifurcation mechanism enveloping slow-fast analysis

Au/La-CeO_(x) catalyst for co oxidation:Effect of different atmospheres pretreatment on gold state—commemorating the 100th anniversary of the birth of Academician Guangxian Xu

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第4期39卷 364-373页

作者： Lulu Zhou Shuai Wei Weiwei Wang Zhao Jin Chunjiang Jia Key Laboratory for colloid and Interface Chemistry Key Laboratory of Special Aggregated MaterialsSchool of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China

So far,it is still a controversial issue which status of gold species is a better active site for catalyzing co ***,the influence of the different atmospheres pretreatment(oxidative and reductive)on gold state of Au/La-CeOx(1 wt%gold loading)catalyst during co oxidation was *** changes of Au species were monitored by combined in situ diffuse reflectance infrared Fourier transform spectroscopy(in situ DRIFTS)and X-ray photoelectron spectroscopy(XPS).For the sample pretreated with oxidative atmosphere,the data show that the initial Au^(3+)is transformed to Au^(δ+)(0co oxidation,which is a key step to lead to higher *** the sample after reductive atmosphere pretreatment,Au^(δ+)is mixed with a small amount of Au^(0)which can be converted to Au^(δ+)with the increase of temperature in ***,the sample always maintains high activity during the ***,the Au®+obtained by reductive pretreatment is more active than the Au^(3+)obtained by oxidative treatment in catalyzing co oxidation.

关键词： Au/La-CeO_(x)catalyst Pretreatment atmospheres co oxidation Au^(δ+) Au^(3+) Rare earths

In-situ growth of large-area monolithic Fe_(2)O_(3)/TiO_(2) catalysts on flexible Ti mesh for co oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第10期69卷 119-128页

作者： Xinyue Tang Junchao Wang Jing Li Xinglai Zhang Peiqing La Xin jiang Baodan Liu Shenyang National Laboratory for Materials Science(SYNL) Institute o f Metal Research(IMR)Chinese Academy of Sciences(CAS)No.72 Wenhua RoadShenyang110016 China School of Materials Science and Engineering University of Science and Technology of ChinaNo.72 Wenhua Road.Shenyang110016 China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China

In this study, we reported the in-situ fabrication of a series of Fe_(2)O_(3)/TiO_(2) monolithic catalysts on flexible Ti mesh via plasma electrolytic oxidation process, hydrothermal reaction and chemical bath deposition(CBD) method. The morphology tailoring of Fe_(2)O_(3) nanostructures finds that Fe2O3 nanosheets supported on TiO2 exhibit superior catalytic performance with a complete oxidation of co at 260℃. The catalytic stability test indicates that the in-situ grown Fe_(2)O_(3)/TiO_(2) catalysts own outstanding performance for continuous co oxidation due to the strong substrate adhesion without mass loss. The microstructures and interfaces of Fe_(2)O_(3)/TiO_(2) catalysts are well studied using series of characterization techniques. The in-situ preparation strategy of metal oxide catalysts in this work will open up more opportunities for the rational design of variety of monolithic catalysts used for co oxidation, de-NO_(x), three-way catalysis and other related application in industry.

关键词： Fe_(2)O_(3)/TiO_(2)nanostructures Monolithic catalysts Plasma electrolytic oxidation In-situ fabrication co oxidation

Effect of Addition of Base on Ceria and Reactivity of CuO/CeO_2 Catalysts for Low-Temperature co oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2007年第2期16卷 179-185页

作者： Xiucheng Zheng Xiaoli Zhang Shuping Wang Xiangyu Wang Shihua Wu Department of Chemistry Institute of Industrial Catalysis Zhengzhou University Zhengzhou 550052 Henan China Department of Chemistry Nankai University Tianjin 300071 China

In this work, we have reported the influence of the addition of base （KOH） on the physicochemical property of ceria synthesized by alcohothermal process, and the alcohothermal mechanism was also put forward. Furthermore, the prepared CeO2 was used as the support to prepare CuO/CeO2 catalysts via the wet impregnation method. The samples were characterized by N2 adsorption-desorption, X-ray powder diffraction （XRD）, high resolution transmission electron microscopy （HRTEM）, and temperatureprogrammed reduction by H2 （H2-TPR）. The catalytic properties of the CuO/CeO2 catalysts for lowtemperature co oxidation were studied using a microreactor-GC system. The crystal size of CeO2-A was much smaller than that of CeO2-B, and the corresponding copper oxide catalysts exhibited higher catalytic activity than that of the CeO2-B-supported catalysts under the same reaction conditions. The alcohothermal mechanism indicated that KOH plays a key role in determining the physicochemical and catalytic properties of ceria-based materials.

关键词： alcohothermal synthesis ceria CuO/CeO2 catalyst co oxidation alcohothermal mechanism

Effect of the loading content of CuO on the activity and structure of CuO/Ce-Mn-O catalysts for co oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2015年第6期33卷 604-610页

作者：赵福真龚渺张广营李金林 Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs commission and Ministry of Education College of Chemistry and MaterialsSouth-Central University for Nationalities Wuhan Engineering co. Ltd.

A urea-nitrate combustion method was used to prepare Ce-Mn-O material, which was applied as the support for a series of CuO/Ce-Mn-O catalysts. The structure of the catalysts was characterized with Nz adsorption/desorption, X-ray diffraction （XRD）, temperature-programmed reduction （TPR） and X-ray photoelectron spectroscopy （XPS）. The catalytic activity of the catalysts for the oxidation of co was evaluated on a conventional fixed-bed quartz reactor. XRD results showed that the synergetic effect between manganese and cerium led to a little higher electron density of Ce3＋ in the mixed oxides. When the CuO content was lower than 5 wt.%, Cu species were well dispersed onto the Ce-Mn-O support or/and they formed a solid solution with CeO2 （inside the fluorite lattice）. At higher CuO content （CuO〉5 wt.%）, large CuO particles were observed. There was strong interaction among ceria, man- ganese and copper oxide because of the doping of Mn. This interplay changed the reducibility and the valence states of the compo- nents, leading to the improved activity of the CuO/Ce-Mn-O catalysts.

关键词： co oxidation copper ceria manganese XRD TPR rare earths

Single-atom catalysts for co oxidation,co_(2) reduction,and O_(2) electrochemistry

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第2期31卷 254-279页

作者： Wenyu Yuan Yiyuan Ma Heng Wu Laifei Cheng Department of Physics Tokyo Metropolitan UniversityHachiojiTokyo 192-0397Japan Science and Technology on Thermostructural composite Materials Laboratory Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina

co_(x)(x=1,2)and O_(2) chemistry play key roles in tackling global severe environmental challenges and energy *** date,the efficient selective electrocatalytic transformations of cox-carbon chemicals,and O_(2)-hydrogenated products are still huge ***-atom catalysts(SACs)as atomic-scale novel catalysts in which only isolated metal atoms are dispersed on supports shed new insights in overcome these obstacles in co_(x) and O_(2) chemistry,including co oxidation,co_(2) reduction reaction(co_(2)RR),oxygen reduction reaction(ORR),and oxygen evolution reaction(OER).In this review,the unique features and advanced synthesis strategies of SACs from a viewpoint of fundamental synthesis design are first highlighted to guide future strategy design for controllable SAC ***,the to-date reported co_(2)RR,co oxidation,OER,and ORR mechanism are included and *** importantly,the design principles and design strategies of improving the intrinsic activity,selectivity,and stability are extensively discussed and the engineering strategy is classified as neighbor coordination engineering,metal-atom engineering,and substrate *** the comprehensive review and summary of state-of-the-art SACs,the synthesis–structure–property–mechanism–design principle relation can be revealed to shed lights into the structural construction of ***,we present an outlook on current challenges and future directions for SACs in co_(x) and O_(2) chemistry.

关键词： Single-atom catalysts co_(2)reduction reaction co oxidation Oxygen reduction reaction Oxygen evolution reaction

Robust Joule-heating ceramic reactors for catalytic co oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第7期11卷 1163-1171页

作者： Fangsheng LIU Zhibo ZHAO Yuyao MA Yi GAO Jiajie LI Xun HU Zhengmao YE Yihan LING Dehua DONG School of Materials Science and Engineering University of JinanJinan 250022China School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China

Joule-heating reactors have the higher energy efficiency and product selectivity compared with the reactors based on radiative *** Joule-heating reactors are constructed with electrically-conductive metals or carbon materials,and therefore suffer from stability issue due to the presence of corrosive or oxidizing gases during high-temperature *** this study,chemicallystable and electrically-conductive(La_(0.80)Sr_(0.20))_(0.95)FeO_(3)(LSF)/Gd_(0.1)Ce_(0.9)O_(2)(GDC)ceramics have been used to construct Joule-heating reactors for the first *** the advantage of the resistance decrease of the ceramic reactors with temperature increase,the ceramic reactors heated under current control mode achieved the automatic adjustment of heating to stabilize reactor *** addition,the electrical resistance of LSF/GDC reactors can be tuned by the content of the highconductive LSF in composite ceramics and ceramic density via sintering temperature,which offers flexibility to control reactor *** ceramic reactors with dendritic channels(less than 100μm in diameter)showed the catalytic activity for co oxidation,which was further improved by coating efficient MnO_(2)nanocatalyst on reactor channel *** Joule-heating ceramic reactors achieved complete co oxidation at a low temperature of 165℃.Therefore,robust ceramic reactors have successfully demonstrated effective Joule heating for co oxidation,which are potentially applied in other high-temperature catalytic reactions.

关键词： Joule heating ceramic reactor microchannel reactor temperature control co oxidation

Recent research progress in the study of catalytic co oxidation by gas phase atomic clusters

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2020年第6期63卷 892-902页

作者： Li-Na Wang Xiao-Na Li Sheng-Gui He State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing National Laboratory for Molecular Sciences and CAS Research/Education Center of Excellence in Molecular Sciences Beijing 100190China

oxidation of co into co2 is a major solution to reduce co emission into the atmosphere and to remove co in fuel gas ***,co oxidation serves as a prototypical reaction for heterogeneous *** review provides an overview and an update on how to study catalytic co oxidation at a strictly molecular level by performing wellcontrolled gas-phase experiments in combination with quantum chemistry *** advances in the unique catalytic reactivity of single-atom cluster catalysts are *** catalytically active sites and various mechanistic aspects in the redox couples N2O/co and O2/co for the seemingly simple oxidation reaction are described.

关键词： co oxidation single-atom catalysts atomic clusters mass spectrometry density functional theory calculations