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| 1 | Effect of preparation method on physicochemical properties and catalytic performances of LaCoO3 perovskite for CO oxidation显示文摘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 investigated.The 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 method.Catalytic 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 time.The cyclic and longterm stability of catalysts were discussed and compared. | Shan Wang Xuelian Xu Junjiang Zhu Duihai Tang Zhen Zhao | 2019 | Journal of Rare Earths2019，37，9： | 10 |
| 2 | Synthesis of a novel ternary HA/Fe-Mn oxides-loaded biochar composite and its application in cadmium(Ⅱ) and arsenic(Ⅴ) adsorption显示文摘Cadmium (Cd) and arsenic (As) are two of the most toxic elements.However,the chemical behaviors of these two elements are different,making it challenging to utilize a single adsorbent with high adsorption capacity for both Cd(Ⅱ) and As(Ⅴ) removal.To solve this problem,we synthesized HA/Fe-Mn oxides-loaded biochar (HFMB),a novel ternary material,to perform this task,wherein scanning electron microscopy (SEM) combined with EDS (SEM-EDS) was used to characterize its morphological and physicochemical properties.The maximum adsorption capacity of HFMB was 67.11 mg/g for Cd(Ⅱ) and 35.59 mg/g for As(Ⅴ),which is much higher compared to pristine biochar (11.06 mg/g,0 mg/g for Cd(Ⅱ) and As(Ⅴ),respectively).The adsorption characteristics were investigated by adsorption kinetics and the effects of the ionic strength and pH of solutions.X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR) revealed that chelation and deposition were the adsorption mechanisms that bound Cd(Ⅱ) to HFMB,while ligand exchange was the adsorption mechanism that bound As(Ⅴ). | Jianhua Guo Changzhou Yan Zhuanxi Luo Hongda Fang Shugang Hu Yinglan Cao | 2019 | Journal of Environmental Sciences2019，31，11： | 10 |
| 3 | Oxygen-deficient metal oxides:Synthesis routes and applications in energy and environment显示文摘Oxyge n vaca ncies impla ntation is an efficie nt way to adjust the physical and chemical properties of metal oxide nano materials to meet the requirements for particular applications.Through reasonable defects design,oxyge-deficient metal oxides with excellent optical and electrical properties are widely applied for environmental protection and energy uses.This review discusses recent advances in synthetic approaches of oxygervdeficient metal oxides and their applications in photocatalysis,electrocatalysis,and energy storage devices.The perspectives of oxyge n?deficie nt metal oxides for increased en ergy dema nd and en vironme ntal sustai liability are also exami ned. | Di Zu Haiyang Wang Sen Lin Gang Ou Hehe Wei Shuqing Sun Hui Wu | 2019 | Nano Research2019，12，9： | 9 |
| 4 | Promoting effect of tantalum and antimony additives on deNOx performance of Ce3Ta3SbOx for NH3-SCR reaction and DRIFT studies显示文摘A superior Ce-Ta-Sb composite oxide catalyst prepared using homogeneous precipitation method exhibited excellent deNOx efficiency and nearly 100% N_2 selectivity with broad operation temperature window and better resistance to higher space velocity, meanwhile strong resistance to H_2 O and SO_2. This catalyst was systematically characterized using XRD, N_2 adsorption, SEM, TEM, XPS, ESR, Raman, H_2-TPR,NH3-TPD and in situ DRIFTS. There exists a synergistic effect between Ce, Ta and Sb species. It is further indicated that the prominent deNOx performance of the Ce3 Ta3 SbOx catalyst is attributed to the elevated Ce3+ concentrations, abundant active surface oxygen species, as well as surface acidity and reducibility,which is closely linked with the synergistic effect between Ce, Sb and Ta species. Results from DRIFTS reveal that the reaction mechanism of surface-adsorbed NH3 and NO_x species is linked to temperature,the L-H mechanism mainly occurs at low temperature(<300 ℃),while the E-R mechanism occurs at high temperature(>300 ℃). Overall,these findings indicate that Ce3 Ta3 SbOx is promising for NO_x practical abatement. | Ning Liu Jingyu Wang Fengying Wang Jun Liu | 2018 | Journal of Rare Earths2018，36，6： | 7 |
| 5 | Catalytic performance of Zr-doped CuO-CeO2 oxides for CO selective oxidation in H2-rich stream显示文摘Zr-doped CuO-CeO2 catalysts for CO selective oxidation were designed and prepared by the hydrothermal method and coprecipitation. The experimental samples were characterized by means of N2 adsorption-desorption isotherms, powder X-ray diffraction, temperature-programmed reduction and Xray photoelectron spectroscopy. It is observed that the catalyst prepared by hydrothermal method exhibits larger specific surface area, smaller crystalline size and higher dispersion of active components compared with those of the catalyst obtained by coprecipitation. Meanwhile, redox properties of copper oxide are improved significantly and highly dispersed copper species providing CO oxidation sites are present on the surface. Furthermore, adsorptive centers of CO and active oxygen species increase on the copper-ceria interfaces. The Zr-doped CuO-CeO2 catalyst prepared by hydrothermal method possesses superior catalytic activity and selectivity for selective oxidation of CO at low temperature compared with those of the sample prepared by coprecipitation. The temperature corresponding to 50% CO conversion is only 73 ℃ and the temperature span of total CO conversion is expanded from 120 to 160 ℃. | Limin Shi Chuanlei Gao Fenghai Guo Yujing Wang Tiebang Zhang | 2019 | Journal of Rare Earths2019，37，7： | 7 |
| 6 | Catalytic activity of Cu-SSZ-13 prepared with different methods for NH_3-SCR reaction显示文摘A series of Cu-SSZ-13 catalysts with the same Cu loading were prepared by different methods of incipient wetness impregnation [Cu-SSZ-13(IWI)], ion exchange[Cu-SSZ-13(IE)] and hydro-thermal synthesis [Cu-SSZ-13(HTS)]. Their activity for selective catalytic reduction of nitrogen oxides(NO_x) with NH3 was determined. The results show that the Cu-SSZ-13(HTS) catalyst exhibits a better ammonia selective catalytic reduction(NH3-SCR)activity compared with the other two catalysts, over which more than 90% NO conversion is obtained at 215-600℃under the space velocity of 180,000 h^(-1). The characterization results reveal that the Cu-SSZ-13(HTS) catalyst possesses more amount of stable Cu^(2+) in the six-membered ring and high ability for NH3 and NO adsorption, leading to its high NH3-SCR activity, although this catalyst has low surface area. On the other hand, the activity of Cu-SSZ-13(IE) catalyst is almost the same as that of Cu-SSZ-13(IWI) catalyst at the temperature lower than 400 ℃, but the activity of the former is much higher than that of the latter at > 400 ℃ due to the high activity of Cu-SSZ-13(IWI) catalyst for NH3 oxidation. | Meng-Jie Han Yun-Lei Jiao Chun-Hong Zhou Yang-Long Guo Yun Guo Guan-Zhong Lu Li Wang Wang-Cheng Zhan | 2019 | Rare Metals2019，38，3： | 6 |
| 7 | TUNGSTEN ELECTRODES CONTAINING THREE TYPES OF RARE EARTH OXIDES显示文摘INTRODUCTIONWithincreasingdemandstothepropertyofweldingelectrodeandbeterknowledgeofThWelectrodematerial’sradioactivity,somes... | Nie, Zuoren Zhou, Meiling Chen, Ying Fan, Xiaowu Zhang, Jiuxing Zuo, Tieyong | 1999 | 中国有色金属学会会刊:英文版1999，9，1： | 5 |
| 8 | Detection and characterization of hepatocellular carcinoma in rats with liver cirrhosis:diagnostic value of combined use of MR positive and negative contrast agents显示文摘BACKGROUND:Gadolinium-enhanced multi-phase dynamic imaging has improved the accuracy of the diagnosis of hypervascular hepatocellular carcinoma (HCC),but using gadolinium-enhanced dynamic imaging alone is problematic in evaluating hypovascular HCC.This work aimed at evaluating the combined use of superparamagnetic iron oxide(SPIO)-enhanced and gadolinium set in distinguishing HCCs from regenerative nodules(RNs)in a rat model induced by diethylnitrosamine(DEN). METHODS:DEN-induced HCC model rats(n=40)and control rats(n=10)were studied.From weeks 16 to 19 after DEN administration,4 animals were scanned every week. The hepatic changes were tested with a 1.5 Tesla magnet, and MR images of SPIO-enhanced and gadolinium set were obtained.According to the pathologic changes,the tumorigenesis was divided into HCC and RN(diameter of nodules≥3 mm).Diagnostic accuracy of the combined SPIO-enhanced and gadolinium set and the gadolinium set alone was evaluated using receiver-operating characteristic curves.Sensitivity and specificity of the combined SPIO- enhanced and gadolinium set and the gadolinium set alone were calculated.RESULTS:The listed tests were completed in 29 rats(21 treated and 8 controls).One hundred and six nodules(82 HCCs,24 RNs)were analyzed.The Az value and sensitivity with the combined SPIO-enhanced and gadolinium set(Az 0.94,sensitivity 0.96)were higher than those with the gadolinium set alone(Az 0.92,sensitivity 0.89). Using the combined SPIO-enhanced and gadolinium set led to detection of 6 nodules which were negative in the gadolinium set alone and 3 nodules were correctly characterized. CONCLUSION:Using the combined SPIO-enhanced and gadolinium set improved the detectability of HCCs and the SPIO-enhanced imaging compensated for the gadolinium set in differentiating HCCs from RNs in a rat model. | Guo, Dong-Mei Qiu, Tian-Shuang Bian, Jie Liu, Shu-Feng Wang, Chang-Zheng | 2009 | Hepatobiliary & Pancreatic Diseases International2009，8，1： | 5 |
| 9 | High Temperature XPS/AES Investigation of Mo-La_2O_3 Cathodes Ⅱ. Variation of Lanthanum During Activation Processes显示文摘The changes of the valence state of lanthanum in the Mo La 2O 3 model cathode specimens were systematically studied by in situ XPS/AES analyses from room temperature to 1550 ℃. The experimental results show that the valence of lanthanum changes during the activation processes. As the temperature increases, the lattice oxygen in La 2O 3 is dissociated, resulting in partial reduction of the lanthanum to LaO x(x <3/2). In addition, the lanthanum rich phase diffuses from bulk into the surface of the sample. The lack of lattice oxygen in this phase has a favorable effect on emission, which leads to a lower work function for the Mo La 2O 3 cathode. | 聂祚仁 左铁镛 周美玲 王亦曼 王金淑 张久兴 | 2000 | Journal of Rare Earths2000，18，2： | 5 |
| 10 | Fabrication of MOF-derived mixed metal oxides with carbon residues for pseudocapacitors with long cycle life显示文摘High electroactivity and good mechanical robustness of electrode materials are essential to deliver excellent elec-trochemical energy storage performance.Herein,metal–organic frameworks(MOF)derived mixed metal oxides(MMO,ZnO@NiO and Co_(3)O_(4)@NiO)are prepared by a two-step annealing process in air.Zinc-based MOF(ZIF-8)and cobalt-based MOF(ZIF-67)were employed,respec-tively,as hard templates for the chemical encapsulation of Ni(OH)_(2)nanostructures by hydrothermal synthesis. | Yuan-Fu Ren Zhi-Liang He Hao-Zhen Zhao Ting Zhu | 2022 | Rare Metals2022，41，3： | 5 |
| 11 | Luminescence characteristics of Dy^(3+) doped Gd_2O_3-CaO-SiO_2-B_2O_3 scintillating glasses显示文摘Glasses were prepared from the compositions of 25Gd_2O_3-10 CaO-10 SiO_2-(55–x)B_2O_3-xDy_2O_3(where x is 0.0 mol.%–1.0 mol.%) by the conventional melt-quenching technique at 1400 oC. The results demonstrated the increase in the glass density with respect to the increase in the doping concentrations of Dy_2O_3. Nine absorption bands were observed. The emission spectra of the developed glass showed two strong peaks at 577 nm(~4F_(9/2)→~6H_(13/2)) and 482 nm(~4F_(9/2)→~6H_(15/2)). The highest emission intensity was observed from the developed glass prepared at 0.4 mol.% of Dy_2O_3, as the efficient energy transfer took place from Gd^(3+) to Dy^(3+). From the X-ray induced optical luminescence, the emission spectra were identical to those from PL measurements, but with the highest intensity observed from the glass quenched at 0.45 mol.% of Dy_2O_3. Finally, the integral scintillation efficiency of the developed glass was determined at 27% of that of the commercially available BGO crystal. | J.Kaewkhao N.Wantana S.Kaewjaeng S.Kothan H.J.Kim | 2016 | Journal of Rare Earths2016，34，6： | 5 |
| 12 | Microstructure and oxygen storage capacity of Sr-modified Pt/CeO_2-ZrO_2 catalysts | Rui Ran a,Jun Fan b,Duan Weng a,a State Key Lab of New Ceramic and Fine Processing,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China b The Administrative Centre for China’s Agenda 21,Beijing 100038,China | 2012 | Progress in Natural Science:Materials International2012，22，1： | 5 |
| 13 | N-doped graphene and TiO_2 supported manganese and cerium oxides on low-temperature selective catalytic reduction of NO_x with NH_3显示文摘A series of N-doped graphene(NG)and TiO_2 supported MnO_x–CeO_2 catalysts were prepared prepared by a hydrothermal method.The catalysts with different molar ratios of Mn/Ce(6:1,10:1,15:1)were investigated for the low-temperature selective catalytic reduction(SCR)of NO_x with NH_3.The synthesized catalysts were characterized by HRTEM,SEM,XRD,BET,XPS,and NH_3-TPD technologies.The characterization results indicated that manganese and cerium oxide particles dispersed on the surface of the TiO_2–NG support uniformly,and that manganese and cerium oxides existed in different valences on the surface of the TiO_2–NG support.At Mn element loading of 8 wt%,MnO_x–CeO_2(10:1)/TiO_2–1%NG displayed superior activity and improved SO_(2 )resistance.On the basis of the catalyst characterization,excellent catalytic performance and SO_2 tolerance at low temperature were attributed to the high content of manganese with high oxidation valence,extensive oxidation of NO into NO_2 by CeO_2 and strong NO adsorption capacity,and electron transfer of N-doped graphene. | Chunlin ZHAO Yanxia WU Hailong LIANG Xi CHEN Jie TANG Xianzhong WANG | 2018 | Journal of Advanced Ceramics2018，7，3： | 5 |
| 14 | Effect of cerium on abrasive wear behaviour of hardfacing alloy显示文摘Hardfacing alloys with different amounts of ceria were prepared by self-shielded flux cored arc welding.The abrasion tests were carried out using the dry sand-rubber wheel machine according to JB/T 7705-1995 standard.The hardness of hardfacing deposits was meas-ured by means of HR-150AL Rockwell hardness test and the fracture toughness was measured by the indentation method.Microstructure characterization and surface analysis were made using optical microscopy,scanning electron microscopy(SEM) and energy spectrum analy-sis.The results showed that the wear resistance was determined by the size and distribution of the carbides,as well as by the matrix micro-structure.The main wear mechanisms observed at the surfaces included micro-cutting and micro-ploughing of the matrix.The addition of ceria improved the hardness and fracture toughness of hardfacing deposits,which would increase the resistance to plastic deformation and scratch,thus the wear resistance of hardfacing alloys was improved. | 行舒乐 余圣甫 邓宇 戴明辉 余露 | 2012 | Journal of Rare Earths2012，30，1： | 4 |
| 15 | Cotransport of graphene oxides/reduced graphene oxides with BPA in both bare and iron oxides coated quartz sand显示文摘This study investigated the cotransport behaviors of graphene oxides(GO) and reduced graphene oxides(RGO) with bisphenol A(BPA) in porous media in both NaCl(1 and 10 mmol/L) and CaCl2 solutions(0.5 and 1.5 mmol/L) at pH 6.5. Both bare and iron oxides-coated quartz sand were employed as porous media in present study. We found that under all examined solution conditions, the presence of BPA(100 μg/L) did not have obvious influence on the transport of both GO and RGO(8 mg/L as TOC) in both bare and iron oxides-coated quartz sand. Although the dissolved BPAwas the major form dominating the transport behaviors of total BPA in the presence of GO/RGO, yet the GO/RGO-associated BPA(due to the adsorption of BPA onto GO/RGO surfaces) also had some contribution to the transport of total BPA in the presence of GO/RGO in two types of porous media.Overall, due to the different transport behaviors of GO and RGO under different solution conditions, we found that the presence of GO/RGO decreased the transport of total BPA under all examined solution conditions in two types of porous media with the smallest decrease in 1 mmol/L NaCl solutions and the largest in 1.5 mmol/L CaCl2 solutions. The results of this study clearly indicated that when BPA was co-present with GO/RGO, the transport behaviors of GO/RGO in porous media would have great influences on the fate and transport of BPA in natural environments due to their adsorption onto GO/RGO. | LIU Xian Wei LI Meng LIU FuYang HE Lei TONG MeiPing | 2019 | Science China(Technological Sciences)2019，62，11： | 4 |
| 16 | The First OCCCO Pentadentate Chelates:Osmium Mediated Stepwise Oxidations of Terminal Alkynes by Pyridine N-Oxide显示文摘of main observation and conclusion Oxygen atom transfer reactions between alkynes and heteroarene N-oxides are currently mediated by transition metal,such as gold,ruthenium or rhodium,but they have never been catalyzed by osmium.Herein,we report stepwise oxidations of terminal alkynes mediated by an osmium carbolong complex,using pyridine N-oxide as the oxidant,yielding novel aldehyde-or carboxylic acid-coordinated osmapentalyne derivatives selectively.The mechanism was illustrated by density functional theory calculations,providing a new route for oxygen atom transfer between heteroarene N-oxides and alkynes. | Jianfeng Lin Qiannan Xu Xinlei Lin Yuhui Hua Dafa Chen Yonghong Ruan Hong Zhang Haiping Xia | 2020 | Chinese Journal of Chemistry2020，38，11： | 4 |
| 17 | Hollow cobalt oxide nanoparticles embedded in nitrogen-doped carbon nanosheets as an efficient bifunctional catalyst for Zn–air battery显示文摘Rational design of low-cost, highly electrocatalytic activity, and stable bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) has been a great significant for metal–air batteries. Herein, an efficient bifunctional electrocatalyst based on hollow cobalt oxide nanoparticles embedded in nitrogen-doped carbon nanosheets(Co/N-Pg) is fabricated for Zn–air batteries. A lowcost biomass peach gum, consisting of carbon, oxygen, and hydrogen without other heteroatoms, was used as carbon source to form carbon matrix hosting hollow cobalt oxide nanoparticles. Meanwhile, the melamine was applied as nitrogen source and template precursor, which can convert to carbon-based template graphitic carbon nitride by polycondensation process. Owing to the unique structure and synergistic effect between hollow cobalt oxide nanoparticles and Co-N-C species, the proposal Co/N-Pg catalyst displays not only prominent bifunctional electrocatalytic activities for ORR and OER, but also excellent durability. Remarkably, the assembled Zn–air battery with Co/N-Pg air electrode exhibited a low discharge-charge voltage gap(0.81 V at 50 mA cm^-2) and high peak power density(119 mW cm^-2) with long-term cycling stability. This work presents an effective approach for engineering transition metal oxides and nitrogen modified carbon nanosheets to boost the performance of bifunctional electrocatalysts for Zn–air battery. | Yuhui Tian Li Xu Jian Bao Junchao Qian Huaneng Su Huaming Li Haidong Gu Cheng Yan Henan Li | 2019 | Journal of Energy Chemistry2019，28，6： | 4 |
| 18 | Effect of Fe_2O_3 on the crystallization behavior of glass-ceramics produced from naturally cooled yellow phosphorus furnace slag显示文摘CaO–Al_2O_3–SiO_2(CAS) glass-ceramics were prepared via a melting method using naturally cooled yellow phosphorus furnace slag as the main raw material.The effects of the addition of Fe_2O_3 on the crystallization behavior and properties of the prepared glass-ceramics were studied by differential thermal analysis,X-ray diffraction,and scanning electron microscopy.The crystallization activation energy was calculated using the modified Johnson–Mehl–Avrami equation.The results show that the intrinsic nucleating agent in the yellow phosphorus furnace slag could effectively promote the crystallization of CAS.The crystallization activation energy first increased and then decreased with increasing amount of added Fe_2O_3.At 4wt% of added Fe_2O_3,the crystallization activation energy reached a maximum of 676.374 k J×mol-1.The type of the main crystalline phase did not change with the amount of added Fe_2O_3.The primary and secondary crystalline phases were identified as wollastonite(CaSiO_3) and hedenbergite(Ca Fe(Si_2O_6)),respectively. | Hong-pan Liu Xiao-feng Huang Li-ping Ma Dan-li Chen Zhi-biao Shang Ming Jiang | 2017 | International Journal of Minerals,Metallurgy and Materials2017，24，3： | 4 |
| 19 | Room-temperature ligancy engineering of perovskite electrocatalyst for enhanced electrochemical water oxidation显示文摘Perovskite oxides are significant candidates to develop electrochemical catalysts for water oxidation in consideration of their high catalysis capacity,low costing and excellent stability.Rational design of coordination structure and overcoming poor electronic transport are regarded as critical factors for outstanding perovskite-based oxygen evolution reaction (OER) catalysts.Herein,we report a mild chemical oxidation method to realize ligancy engineering from strongly-correlated brownmillerite Sr2Co2O5 to perovskite phase Sr2Co2O5.5,along with abundant oxygen vacancies formation and greatly boosted electric conductivity,which helps to form the active species of Co hydroxide/oxide on the surface of catalysts.The coupling effect of catalytic kinetics and unimpeded electronic movement brings high OER activities in Sr2Co2O5.5 with a low onset potential and a small Tafel slope.Our work not only displays in-depth understanding into the relationship among catalysis performance and multiple physical degrees of freedom,but also paves a new path to develop high-efficient electrochemical catalysts. | Junchi Wu Yuqiao Guo Haifeng Liu Jiyin Zhao Haodong Zhou Wangsheng Chu Changzheng Wu | 2019 | Nano Research2019，12，9： | 4 |
| 20 | Interactions of molten salts with cathode products in the FFC Cambridge Process显示文摘Molten salts play multiple important roles in the electrolysis of solid metal compounds,particularly oxides and sulfides,for the extraction of metals or alloys.Some of these roles are positive in assisting the extraction of metals,such as dissolving the oxide or sulfide anions,and transporting them to the anode for discharging,and offering the high temperature to lower the kinetic barrier to break the metal-oxygen or metal-sulfur bond.However,molten salts also have unfavorable effects,including electronic conductivity and significant capability of dissolving oxygen and carbon dioxide gases.In addition,although molten salts are relatively simple in terms of composition,physical properties,and decomposition reactions at inert electrodes,in comparison with aqueous electrolytes,the high temperatures of molten salts may promote unwanted electrode-electrolyte interactions.This article reviews briefly and selectively the research and development of the F ray-F arthing-Chen(FFC)Cambridge Process in the past two decades,focusing on observations,understanding,and solutions of various interactions between molten salts and cathodes at different reduction states,including perovskitization,non-wetting of molten salts on pure metals,carbon contamination of products,formation of oxychlorides and calcium intermetallic compounds,and oxygen transfer from the air to the cathode product mediated by oxide anions in the molten salt. | George Z.Chen | 2020 | International Journal of Minerals,Metallurgy and Materials2020，27，12： | 4 |
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