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溶胶-凝胶法制备CeO2负载CuO低温CO氧化催化剂 被引量:1
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作者 郑修成 黄唯平 +2 位作者 张守民 王淑荣 吴世华 《催化学报》 SCIE CAS CSCD 北大核心 2003年第12期887-888,共2页
Ceria is widely used as a promoter in "three-way catalysts" (TWC). The promotion effect of ceria was originally supposed to be in the structural aspects and chemical ones. Precious metals are widely used for... Ceria is widely used as a promoter in "three-way catalysts" (TWC). The promotion effect of ceria was originally supposed to be in the structural aspects and chemical ones. Precious metals are widely used for exhaust gas emission control. However, because the high cost of precious metals and their sensitivity to sulfur poisoning, attention has been given to nonprecious metal catalysts such as copper oxide. 展开更多
关键词 溶胶-凝胶法 制备 CeO2负载 CUO 低温co氧化催化剂 氧化 氧化
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纳米锐钛矿TiO2及负载金催化剂的制备与催化性能 被引量:4
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作者 程玉红 周婷 +5 位作者 何璇 曹会勤 郭杰 高秋菊 赵春霞 马小东 《材料导报》 EI CAS CSCD 北大核心 2012年第14期25-28,共4页
通过简单的水解-沉淀法制备了纳米TiO2,考察了反应条件对其粒径和晶型的影响。结果表明制备小粒径锐钛矿TiO2的有利条件为:倒加法;Ti(OBu)4与C2H5OH、H2O与C2H5OH和Ti(OBu)4与H2O的体积比分别为1/3、1/4和1/1;pH=7和400℃焙烧。沉积-沉... 通过简单的水解-沉淀法制备了纳米TiO2,考察了反应条件对其粒径和晶型的影响。结果表明制备小粒径锐钛矿TiO2的有利条件为:倒加法;Ti(OBu)4与C2H5OH、H2O与C2H5OH和Ti(OBu)4与H2O的体积比分别为1/3、1/4和1/1;pH=7和400℃焙烧。沉积-沉淀法制备的Au/TiO2催化剂催化CO氧化结果表明,催化剂的活性受焙烧温度影响很大,200℃焙烧的催化剂具有最好的催化活性。 展开更多
关键词 纳米 锐钛矿TIO2 Au/TiO2催化剂低温co氧化
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矿山救护仪器中普遍使用的化学药剂
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作者 张振华 韩颖 《煤矿安全》 CAS 北大核心 2004年第9期38-39,共2页
文章介绍了矿山救护仪器中普遍使用的化学药剂的性质、使用和储存时的注意事项及其简单的制备方法。这些药剂包括呼吸器中使用的CO2吸收剂,过滤式自救器中使用的干燥剂和CO氧化剂,化学氧自救器中使用的生氧剂。文章还对部分失去活性药... 文章介绍了矿山救护仪器中普遍使用的化学药剂的性质、使用和储存时的注意事项及其简单的制备方法。这些药剂包括呼吸器中使用的CO2吸收剂,过滤式自救器中使用的干燥剂和CO氧化剂,化学氧自救器中使用的生氧剂。文章还对部分失去活性药剂的复活方法进行了简单的描述。 展开更多
关键词 呼吸器 自救器 CO2吸收剂 co氧化催化剂 干燥剂
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Effect of Calcination Temperature on Surface Oxygen Vacancies and Catalytic Performance Towards CO Oxidation of Co3O4 Nanoparticles Supported on SiO2 被引量:1
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作者 李金兵 姜志全 +1 位作者 王坤 黄伟新 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2012年第1期103-109,I0004,共8页
Co3O4/SiO2 catalysts for CO oxidation were prepared by conventional incipient wetness impregnation followed by calcination at various temperatures. Their structures were char- acterized with X-ray diffraction (XRD),... Co3O4/SiO2 catalysts for CO oxidation were prepared by conventional incipient wetness impregnation followed by calcination at various temperatures. Their structures were char- acterized with X-ray diffraction (XRD), laser Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR) and X-ray absorption fine structure (XAFS) spectroscopy. Both XRD and Raman spectroscopy only detect the existence of Co3O4 crystallites in all catalysts. However, XPS results indicate that excess Co2+ ions are present on the surface of Co3O4 in Co3O4(200)/Si02 as compared with bulk Co3O4. Meanwhile, TPR results suggest the presence of surface oxygen vacancies on Co3O4 in Co3O4(200)/SiO2, and XAFS results demonstrate that Co3O4 in Co3O4(200)/SIO2 contains excess Co2+. Increasing calcination temperature results in oxidation of excess Co2+ and the decrease of the concentration of surface oxygen vacancies, consequently the for- mation of stoichiometric Co3O4 on supported catalysts. Among all Co3O4/SiO2 catalysts, Co3O4(200)/SiO2 exhibits the best catalytic performance towards CO oxidation, demonstrating that excess Co2+ and surface oxygen vacancies can enhance the catalytic activity of Co3O4 towards CO oxidation. These results nicely demonstrate the effect of calcination temperature on the structure and catalytic performance towards CO oxidation of silicasupported Co3O4 catalysts and highlight the important role of surface oxygen vacancies on Co3O4. 展开更多
关键词 Co3O4/8iO2 catalyst CO oxidation Calcination temperature Surface oxygen vacancies
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Selective CO Methanation over Ru Catalysts Supported on Nanostructured TiO2 with Different Crystalline Phases and Morphology 被引量:1
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作者 王桂英 高玉仙 +1 位作者 汪文栋 黄伟新 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2012年第4期475-480,I0004,共7页
Nanostructured titanium dioxides were synthesized via various post-treatments of titanate nanofibers obtained from titanium precursors by hydrothermal reactions. The microstructures of TiO2 and supported Ru/TiO2 catal... Nanostructured titanium dioxides were synthesized via various post-treatments of titanate nanofibers obtained from titanium precursors by hydrothermal reactions. The microstructures of TiO2 and supported Ru/TiO2 catalysts were characterized with X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray analysis, and nitrogen adsorption isotherms. The phase structure, particle size, morphology, and specific surface area were determined. The supported Ru catalysts were applied for the selective methanation of CO in a hydrogen-rich stream. The results indicated that the Ru catalyst supported on rutile and TiO2-B exhibited higher catalytic performance than the counterpart supported on anatase, which suggested the distinct interaction between Ru nanoparticles and TiO2 resulting from different crystalline phases and morphology. 展开更多
关键词 Selective CO methanation Ru catalyst Titanium dioxide MICROSTRUCTURE
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Enhanced CO oxidation over potassium-promoted Pt/Al_2O_3 catalysts:Kinetic and infrared spectroscopic study 被引量:1
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作者 刘欢欢 贾爱平 +2 位作者 王瑜 罗孟飞 鲁继青 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1976-1986,共11页
A series of K-promoted Pt/Al2O3 catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-co... A series of K-promoted Pt/Al2O3 catalysts were tested for CO oxidation. It was found that the addition of K significantly enhanced the activity. A detailed kinetic study showed that the activation energies of the K-containing catalysts were lower than those of the K-free ones, particularly for catalysts with high Pt contents (51.6 k)/mol for 0.42K-2.0Pt/Al2O3 and 6:3.6 kJ/mol for 2.0Pt/Al2O3 ). The CO reaction orders were higher for the K-containing catalysts (about -0.2) than for the K-free ones (about -0.5), with the former having much lower equilibrium constants for CO adsorption than the latter. In situ Fourier-transform infrared spectroscopy showed that surface CO desorption from the 0.42K-2.0Pt/Al2O3 catalyst was easier than from 2.0Pt/Al2O3. The promoting effect of K was therefore caused by weakening of the interactions between CO and surface Pt atoms. This decreased coverage of the catalyst with CO and facilitated competitive O2 chemisorption on the Pt surface, and significantly lowered the reaction barrier between chemisorbed CO and O2 species. 展开更多
关键词 CO oxidation Potassium Kinetics Pt/Al2O3 catalyst Promoting effect
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Preparation of gold nanoparticles supported on Nb_2O_5 by deposition precipitation and deposition reduction methods and their catalytic activity for CO oxidation 被引量:2
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作者 Toru Murayama Masatake Haruta 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第10期1694-1701,共8页
Nanoparticulate gold catalysts supported on niobium oxides (Nb2O5) were prepared by different deposition methods. The deposition precipitation (DP) method, DP method with urea, deposition reduction (DR) method a... Nanoparticulate gold catalysts supported on niobium oxides (Nb2O5) were prepared by different deposition methods. The deposition precipitation (DP) method, DP method with urea, deposition reduction (DR) method and one‐pot method were used to prepare a 1 wt%Au/Nb2O5 catalyst. Lay‐ered‐type Nb2O5 synthesized by a hydrothermal method (Nb2O5(HT)) was the most suitable as a support among various types of Nb2O5 including commercially available Nb2O5 samples. It appeared that the large BET surface area of Nb2O5(HT) enabled the dispersion of gold as nanoparticles (NPs). Gold NPs with a mean diameter of about 5 nm were deposited by both the DP method and DR method on Nb2O5(HT) under an optimized condition. The temperature for 50%CO conversion for Au/Nb2O5(HT) prepared by the DR method was 73 &#176;C. Without deposition of gold, Nb2O5(HT) showed no catalytic activity for CO oxidation even at 250 &#176;C. Therefore, the enhancement of the activity by deposition of gold was remarkable. This simple Au/Nb2O5 catalyst will expand the types of gold catalysts to acidic supports, giving rise to new applications. 展开更多
关键词 Gold nanoparticulate Niobium oxide Solid acid CO oxidation Heterogeneous catalyst
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Role of La_2_O3 as Promoter and Support in Ni/γ-Al_2O_3 Catalysts for Dry Reforming of Methane 被引量:2
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作者 Ahmed S.Al-Fatesh Muhammad A.Naeem +1 位作者 Anis H.Fakeeha Ahmed E.Abasaeed 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第1期28-37,共10页
The nature of support and type of active metal affect catalytic performance. In this work, the effect of using La203 as promoter and support for Ni/γ-A1203 catalysts in dry reforming of methane was investigated. The ... The nature of support and type of active metal affect catalytic performance. In this work, the effect of using La203 as promoter and support for Ni/γ-A1203 catalysts in dry reforming of methane was investigated. The reforming reactions were carried out at atmosphenc pressure in the temperature range of 500-2700℃. The activity and stability of the catalyst, carbon formation, and syngas (H2/CO) ratio were determined. Various techniques were applied for characterization of both fresh and used catalysts. Addition of La2O3 to the catalyst matrix improved the dispersion of Ni and adsorption of CO2, thus its activity and stability enhanced. 展开更多
关键词 CO2 methane reforming.Ni/γ-A12O3 La2O3 carbon deposition H2/CO
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Nanoscale architecture of ceria-based model catalysts: Pt-Co nanostructures on well-ordered CeO_(2)(111) thin films 被引量:2
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作者 Yaroslava Lykhach TomásSkála +5 位作者 Armin Neitzel Nataliya Tsud Klára Beranová Kevin CPrince Vladimír Matolín Jorg Libuda 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第6期985-997,共13页
We have prepared and characterized atomically well-defined model systems for ceria-supported Pt-Co core-shell catalysts. Pt@Co and Co@Pt core-shell nanostructures were grown on well-ordered CeO2(111) films on Cu(111) ... We have prepared and characterized atomically well-defined model systems for ceria-supported Pt-Co core-shell catalysts. Pt@Co and Co@Pt core-shell nanostructures were grown on well-ordered CeO2(111) films on Cu(111) by physical vapour deposition of Pt and Co metals in ultrahigh vacuum and investigated by means of synchrotron radiation photoelectron spectroscopy and resonant photoemission spectroscopy. The deposition of Co onto CeO2(111) yields CoCeO2(111) solid solution at low Co coverage(0.5 ML), followed by the growth of metallic Co nanoparticles at higher Co coverages. Both Pt@Co and Co@Pt model structures are stable against sintering in the temperature range between 300 and 500 K. After annealing at 500 K, the Pt@Co nanostructure contains nearly pure Co-shell while the Pt-shell in the Co@Pt is partially covered by metallic Co. Above 550 K, the re-ordering in the near surface regions yields a subsurface Pt-Co alloy and Pt-rich shells in both Pt@Co and Co@Pt nanostructures. In the case of Co@Pt nanoparticles, the chemical ordering in the near surface region depends on the initial thickness of the deposited Pt-shell. Annealing of the Co@Pt nanostructures in the presence of O2 triggers the decomposition of Pt-Co alloy along with the oxidation of Co, regardless of the thickness of the initial Pt-shell. Progressive oxidation of Co coupled with adsorbate-induced Co segregation leads to the formation of thick CoO layers on the surfaces of the supported Co@Pt nanostructures. This process is accompanied by the disintegration of the CeO2(111) film and encapsulation of oxidized Co@Pt nanostructures by CeO2 upon annealing in O2 above 550 K. Notably, during oxidation and reduction cycles with O2 and H2 at different temperatures, the changes in the structure and chemical composition of supported Co@Pt nanostructures were driven mainly by oxidation while reduction treatments had little effect regardless of the initial thickness of the Pt-shell. 展开更多
关键词 Core-shell nanoparticles Model catalyst Pt-Co Cerium oxide Chemical ordering Synchrotron radiation photoelectron spectroscopy
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Oxidative desulfurization of dibenzothiophene over Fe promoted Co–Mo/Al_2O_3 and Ni–Mo/Al_2O_3 catalysts using hydrogen peroxide and formic acid as oxidants 被引量:3
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作者 Yaseen Muhammad Ayesha Shoukat +2 位作者 Ata Ur Rahman Haroon Ur Rashid Waqas Ahmad 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第3期593-600,共8页
This work reports the enhancing effect of a highly cost effective and efficient metal, Fe, incorporation to Co or Ni based Mo/Al2O3 catalysts in the oxidative desulfurization (ODS) of dibenzothiophene (DBT) using ... This work reports the enhancing effect of a highly cost effective and efficient metal, Fe, incorporation to Co or Ni based Mo/Al2O3 catalysts in the oxidative desulfurization (ODS) of dibenzothiophene (DBT) using H2O2 and formic acid as oxidants. The influence of operating parameters i.e. reaction time, catalyst dose, reaction temperature and oxidant amount on oxidation process was investigated. Results revealed that 99% DBT conversion was achieved at 60℃ and 150 min reaction time over Fe-Ni-Mo/Al2O3. Fe tremendously enhanced the ODS activity of Co or Ni based Mo/Al2O3 catalysts following the activity order:Fe-Ni-Mo/Al2O3 〉 Fe-Co-Mo/Al2O3 〉 Ni-Mo/Al2O3 〉 Co-Mo/Al2O3, while H2O2 exhibited higher oxidation activity than formic acid over all catalyst systems. Insight about the surface morphology and textural properties of fresh and spent catalysts were achieved using scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis, Atomic Absorption Spectroscopy (AAS) and BET surface area analysis, which helped in the interpretation of experimental data. The present study can be deemed as an effective approach on industrial level for ODS of fuel oils crediting to its high efficiency, low process/catalyst cost, safety and mild operating condition. 展开更多
关键词 Oxidative desulfurization Fuel oil Dibenzothiophene Fe promoted (Co/Ni)-Mo/Al2O3 catalyst XRD
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Reversible transformation between terrace and step sites of Pt nanoparticles on titanium under CO and O_(2) environments
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作者 Yang Ou Songda Li +5 位作者 Fei Wang Xinyi Duan Wentao Yuan Hangsheng Yang Ze Zhang Yong Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第8期2026-2033,共8页
Understanding the dynamic evolution of active sites of supported metal catalysts during catalysis is fundamentally important for improving its performance,which attracts tremendous research interests in the past decad... Understanding the dynamic evolution of active sites of supported metal catalysts during catalysis is fundamentally important for improving its performance,which attracts tremendous research interests in the past decades.There are two main surficial structures for metal catalysts:terrace sites and step sites,which exhibit catalytic activity discrepancy during catalysis.Herein,by using in situ transmission electron microscopy and in situ Fourier transform infrared spectroscopy(FTIR),the transformation between surface terrace and step sites of Pt-TiO_(2) catalysts was studied under CO and O_(2) environments.We found that the{111}step sites tend to form at{111}terrace under O_(2) environment,while these step sites prefer to transform into terrace under CO environment at elevated temperature.Meanwhile,quantitative ratios of terrace/step sites were obtained by in situ FTIR.It was found that this transformation between terrace sites and step sites was reversible during gas treatment cycling of CO and O_(2).The selective adsorption of O_(2) and CO species at different sites,which stabilized the step/terrace sites,was found to serve as the driving force for active sites transition by density functional theory calculations.Inspired by the in situ results,an enhanced catalytic activity of Pt-TiO_(2) catalysts was successfully achieved through tuning surface-active sites by gas treatments. 展开更多
关键词 In situ transmission electron microscopy Surface reconstruction Metal catalyst Active site CO oxidation reaction
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Mass production of Co3O4@CeO2 core@shell nanowires for catalytic CO oxidation 被引量:4
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作者 Jiangman Zhen Xiao Wang +5 位作者 Dapeng Liu Zhuo Wang Junqi Li Fan Wang Yinghui Wang Hongjie Zhang 《Nano Research》 SCIE EI CAS CSCD 2015年第6期1944-1955,共12页
In this study, Co3O4@CeO2 core@shell nanowires were successfully prepared via thermal decomposition of Co(CO3)0.5(OH).0.11H2O@CeO2 core@shell nanowire precursors. As a CO oxidation catalyst, Co3O4@CeO2 shows remar... In this study, Co3O4@CeO2 core@shell nanowires were successfully prepared via thermal decomposition of Co(CO3)0.5(OH).0.11H2O@CeO2 core@shell nanowire precursors. As a CO oxidation catalyst, Co3O4@CeO2 shows remarkably enhanced catalytic performance compared to Co3O4 nanowires and CeO2 nanoparticles (NPs), indicating obvious synergistic effects between the two components. It also suggests that the CeO2 shell coating can effectively prevent Co3O4 nanowires from agglomerating, hence effecting a substantial improvement in the structural stability of the Co3O4 catalyst. Furthermore, the fabrication of the welbdisperse4 core@shell structure results in a maximized interface area between Co3O4 and CeO2, as well as a reduced Co3O4 size, which may be responsible for the enhanced catalytic activity of Co3O4@CeO2. Further examination revealed that CO oxidation may occur at the interface of Co3O4 and CeO2. The influence of calcination temperatures and the component ratio between Co3O4 and CeO2 were then investigated in detail to determine the catalytic performance of Co3O4@CeO2 core@shell nanowires, the best of which was obtained by calcination at 250 ℃ for 3 h with a Ce molar concentration of about 38.5%. This sample achieved 100% CO conversion at a reduced temperature of 160 ℃. More importantly, more than 2.5 g of the Co3O4@CeO2 core@shell nanowires were produced in one pot by this simple process, which may be beneficial for practical applications as automobile-exhaust gas-treatment catalysts. 展开更多
关键词 Co3O4@CeO2 core@shell NANOWIRES CO oxidation synergistic effects
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Development of Novel Supported Gold Catalysts: A Materials Perspective 被引量:9
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作者 Zhen Ma Sheng Dai 《Nano Research》 SCIE EI CAS CSCD 2011年第1期3-32,共30页
Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by s... Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO2), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research. 展开更多
关键词 GOLD NANOPARTICLES catalyst design catalyst support FUNCTIONALIZATION PROMOTION CO oxidation
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Synthesis of Pd Nanocrystals Enclosed by {100} Facets and with Sizes 〈10 nm for Application in CO Oxidation 被引量:25
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作者 Mingshang Jin Hongyang Liu +3 位作者 Hui Zhang Zhaoxiong Xie Jingyue Liu Younan Xia 《Nano Research》 SCIE EI CAS CSCD 2011年第1期83-91,共9页
The catalytic activity of noble-metal nanocrystals is mainly determined by their sizes and the facets exposed on the surface. For single crystals, it has been demonstrated that the Pd(100) surface is catalytically m... The catalytic activity of noble-metal nanocrystals is mainly determined by their sizes and the facets exposed on the surface. For single crystals, it has been demonstrated that the Pd(100) surface is catalytically more active than both Pd(110) and Pd(111) surfaces for the CO oxidation reaction. Here we report the synthesis of Pd nanocrystals enclosed by {100} facets with controllable sizes in the range of 6-18 nm by manipulating the rate of reduction of the precursor. UV-vis spectroscopy studies indicate that the rate of reduction of Na2PdC14 can be controlled by adjusting the concentrations of Br- and C1- ions added to the reaction mixture. Pd nanocrystals with different sizes were immobilized on ZnO nanowires and evaluated as catalysts for CO oxidation. We found that the activity of this catalytic system for CO oxidation showed a strong dependence on the nanocrystal size. When the size of the Pd nanocrystals was reduced from 18 nm to 6 nm, the maximum conversion rate was significantly enhanced by a factor of -10 and the corresponding maximum conversion temperature was lowered by -80℃. 展开更多
关键词 PALLADIUM NANOCUBES CO oxidation SIZE-DEPENDENCE
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The study of the active surface for CO oxidation over supported Pd catalysts 被引量:1
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作者 Xuefei Weng Xiang Yuan +3 位作者 Huan Li Xiaokun Li Mingshu Chen Huilin Wan 《Science China Chemistry》 SCIE EI CAS CSCD 2015年第1期174-179,共6页
CO oxidation was investigated on various powder oxide supported Pd catalysts by temperature-programined reaction. The pre-reduced catalysts show significantly higher activities than the pre-oxidized ones. Model studie... CO oxidation was investigated on various powder oxide supported Pd catalysts by temperature-programined reaction. The pre-reduced catalysts show significantly higher activities than the pre-oxidized ones. Model studies were performed to better understand the oxidation state, reactivities and stabilities of partially oxidized Pd surfaces under CO oxidation reaction condi tions using an in situ infrared reflection absorption spectrometer (IRAS). Three O/Pd(100) model surfaces, chemisorbed oxygen covered surface, surface oxide and bulk-like surface oxide, were prepared and characterized by low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES). The present work demonstrates that the oxidized palladium surface is less active for CO oxidation than the metallic surface, and is unstable under the reaction conditions with sufficient CO. 展开更多
关键词 CO oxidation in-situ IRAS temperature-programmed reaction PALLADIUM catalytically active surface
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