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Active Fischer-Tropsch synthesis Fe-Cu-K/SiO_2 catalysts prepared by autocombustion method without a reduction step 认领 引用 被引量：1
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作者 Suthasinee Pengnarapat Peipei Ai +3 位作者 Prasert Reubroycharoen Tharapong Vitidsant Yoshiharu Yoneyama Noritatsu Tsubaki 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第2期432-438,共7页
The purpose of this study was to prepare iron-based catalysts supported on silica by autocombustion method for directly using for Fischer-Tropsch synthesis（FTS） without a reduction step. The effect of different citr... The purpose of this study was to prepare iron-based catalysts supported on silica by autocombustion method for directly using for Fischer-Tropsch synthesis（FTS） without a reduction step. The effect of different citric acid（CA）：iron nitrate（N） molar ratios and acid types on the FTS performance of catalysts were investigated. The CA：N molar ratios had an important influence on the formation of iron active phases and FTS activity. The iron carbide（FexC）, which is known to be one of the iron active phases, was demonstrated by the X-ray diffraction and X-ray photoelectron spectroscopy. Increasing the CA：N molar ratios up to 0.1 increased CO conversion of catalyst to 86.5%, which was then decreased markedly at higher CA：N molar ratios. An excess of CA resulted in carbon residues covering the catalyst surface and declined FTS activity. The optimal catalyst（CA：N molar ratio = 0.1） achieved the highest CO conversion when compared with other autocombustion catalysts as well as reference catalyst prepared by impregnation method, followed by a reduction step. The autocombustion method had the advantage to synthesize more efficient catalysts without a reduction step. More interestingly, iron-based FTS catalysts need induction duration at the initial stage of FTS reaction even after reduction, because metallic iron species need time to be transformed to FexC. But here, even if without reduction, FexC was formed directly by autocombustion and induction period was eliminated during FTS reaction. 展开更多
关键词 Fischer-Tropsch synthesis Iron-based catalysts Autocombustion Iron carbide SiO2
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Theoretical Study of Dehydrogenation Reaction Mechanism on Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2,or Cu1/Au8Cu2/TiO2Surfaces 认领 引用
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作者 Hongwei Li Ruimin Wang +2 位作者 Caifang Han Bo Ren Hongjun Fan 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第2期225-232,I0069-I0071,I0170,共8页
Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for ... Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for H2 produc-tion.We have systematically investigated the mechanism of catalytic H2 generation on the Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2and Cu1/Au8Cu2/TiO2surfaces using density func-tional theory.Our results demonstrate an O-Hδ+···Hδ−-M type transition state for H2 production,and the Au8Cu2(0.54 eV)bimetal-lic cluster catalyst exhibits more activity in comparison to the Cu10(0.63 eV)and Au10(0.88 eV)cluster catalysts on the TiO2surface.On the Cu1/Au8Cu2/TiO2surface,we found that Au8Cu2clusters act as electron donors,while Cu single atom acts as an electron acceptor.Therefore,the Au8Cu2bimetallic catalyst has a low energy barrier(0.58 eV)in the reductive reaction of H2 production in water,but Cu single atom as the catalytic center has a higher en-ergy barrier(1.49 eV).This implies that bimetallic catalysts may be able to catalyze the wa-ter dehydrogenation reaction more successfully,which would be important knowledge for comprehending and refining the photocatalytic H2 generation process. 展开更多
关键词 TiO2surface Metal cluster Dehydrogenation Cu Au Bimetallic catalyst Den-sity functional theory
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The effect of ethanol on the performance of CrO_x/SiO_2 catalysts during propane dehydrogenation 认领 引用 被引量：5
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作者 李利娜 朱文良 +6 位作者 石磊 刘勇 刘红超 倪友明 刘世平 周慧 刘中民 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第3期359-366,共8页
The effects of ethanol vapor pretreatment on the performance of CrOx/SiO2 catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO2.The catalyst pretreated with eth... The effects of ethanol vapor pretreatment on the performance of CrOx/SiO2 catalysts during the dehydrogenation of propane to propylene were studied with and without the presence of CO2.The catalyst pretreated with ethanol vapor exhibited better catalytic activity than the pristine CrOx/SiO2,generating 41.4% propane conversion and 84.8% propylene selectivity.The various catalyst samples prepared were characterized by X-ray diffraction,transmission electron microscopy,temperature-programmed reduction,X-ray photoelectron spectroscopy and reflectance UV-Vis spectroscopy.The data show that coordinative Cr^3＋ species represent the active sites during the dehydrogenation of propane and that these species serve as precursors for the generation of Cr^3＋.Cr^3＋ is reduced during the reaction,leading to a decrease in catalytic activity.Following ethanol vapor pretreatment,the reduced CrOx in the catalyst is readily re-oxidized to Cr^6＋ by CO2.The pretreated catalyst thus exhibits high activity during the propane dehydrogenation reaction by maintaining the active Cr^3＋ states. 展开更多
关键词 Propane Dehydrogenation CrOx/SiO2 catalyst Ethanol vapor pretreatment Carbon dioxide
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Investigation of water adsorption and dissociation on Au_1/CeO_2 single-atom catalysts using density functional theory 认领 引用 被引量：3
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作者 Yan Tang Yang‐Gang Wang +1 位作者 Jin‐Xia Liang Jun Li 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第9期1558-1565,共8页
We examined the water adsorption and dissociation on ceria surfaces as well as ceria‐supported Au single‐atom catalysts using density functional theory calculations.Molecular and dissociative water were observed to ... We examined the water adsorption and dissociation on ceria surfaces as well as ceria‐supported Au single‐atom catalysts using density functional theory calculations.Molecular and dissociative water were observed to coexist on clean CeO2and reduced Au1/CeO2?x surfaces because of the small difference in adsorption energies,whereas the presence of dissociative water was highly favorable on reduced CeO2?x and clean Au1/CeO2surfaces.Positively charged Au single atoms on the ceria surface not only provided activation sites for water adsorption but also facilitated water dissociation by weakening the intramolecular O-H bonds.In contrast,negatively charged Au single atoms were not reactive for water adsorption because of the saturation of Au5d and6s electron shells.This work provides a fundamental understanding of the interaction between water and single‐atom Au catalysts. 展开更多
关键词 Single‐atom catalyst Au single atom Ceria H2O dissociation
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Study on Au/Al_2O_3 catalysts for low-temperature CO oxidation in situ FT-IR 认领 引用
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作者 Xuhua Zou Shixue Qi +3 位作者 Jinguang Xu Zhanghuai Suo Lidun An Feng Li 《Journal of Natural Gas Chemistry》 2010年第3期307-312,共6页
Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were exa... Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were examined after separate treatment in CO＋O2 or CO2 ＋O2 .Furthermore,in situ FT-IR studies were performed to investigate the species on the surface when CO or CO＋O2 or CO2 ＋O2 was selected separately as adsorption gas.The results showed that Au/Al2O3 catalyst exhibited very high initial activity,but the catalytic activity was found to decrease gradually during CO oxidation with time on stream.And also,the activity of the catalyst declined after treatment in CO＋O2 or CO2 ＋O2 .The formation and accumulation of carbonate-like species during CO oxidation or treatment in CO＋O2 or CO2 ＋O2 might be mainly responsible for the activity decrease,which was reversible. 展开更多
关键词 supported gold catalyst Au/Al2O3 CO oxidation catalytic activity stability in situ FT-IR
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Partial oxidation of methane over SiO2 supported Ni and NiCe catalysts 认领 引用 被引量：4
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作者 A.Emamdoust V.La Parola +3 位作者 G.Pantaleo M.L.Testa S.Farjami Shayesteh A.M.Venezia 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第8期1-9,I0001,共9页
Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS a... Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 wt% Ni and 20 wt% CeO2 were prepared by microwave assisted(co) precipitation method. The catalysts were investigated by XRD,TPR and XPS analyses and they were tested in partial oxidation of methane(CPO). The catalytic reaction was carried out at atmospheric pressure in a temperature range of 400–800℃ with a feed gas mixture containing methane and oxygen in a molecular ratio CH4/O2=2. The Ni catalyst exhibited 60% methane conversion with 60% selectivity to CO already at 500℃. On the contrary, the Ni–Ce catalyst was inert to CPO up to 700℃. Moreover, the former catalyst reproduced its activity at the descending temperatures maintaining a good stability at 600℃, over a reaction time of 80 h, whereas the latter one completely deactivated. Test of CH4 temperature programmed surface reaction(CH4-TPSR) revealed a higher methane activation temperature(> 100℃) for the Ni–Ce catalyst as compared to the Ni one. Noticeable improvement of the ceria containing catalyst occurred when the reaction test started at a temperature higher than the methane decomposition temperature. In this case, the sample achieved the same catalytic behavior of the Ni catalyst. As confirmed by XPS analyses, the distinct electronic state of the supported nickel was responsible for the differences in catalytic behavior. 展开更多
关键词 Methane catalytic partial oxidation(CPO) Ni catalyst NiCe SiO2 supported catalysts
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Influence of V/P Ratio on the Catalytic Performance of VPO/SiO_2 Catalysts for Ammoxidation of Chloro-Substituted Toluenes 认领 引用
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作者 DONG Yanling XU Longlong +4 位作者 ZHANG Zhenguo LIU Wenhui LI Xiongjian ZHONG Yalan HUANG Chi 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2019年第1期23-29,共7页
A series of vanadium phosphate oxide(VPO) catalysts supported on silica(VPO/Si O2) with various mole ratios of V/P(nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by am... A series of vanadium phosphate oxide(VPO) catalysts supported on silica(VPO/Si O2) with various mole ratios of V/P(nV:nP=1:0.8-1:3) were prepared through impregnation method. The catalytic activity was evaluated by ammoxidation reactions of several kinds of chloro-substituted toluenes(CT) in a fixed-bed reactor. The catalyst presented the best performance when nV:nP is 1:1.6. The prepared catalysts were characterized by N2 adsorption, hydrogen temperature programmed reduction(TPR) and ammonia temperature programmed desorption(TPD) and etc. The results reveal that P can decrease the bonding energy of V=O and increase the mobility of lattice oxygen which was beneficial for the improvement of the catalysts, while too much P can greatly decrease the average oxidation number of V which leads to deactivation of the catalysts. The surface acidity of the VPO/Si O2 catalysts is affected by nV:nP and the catalyst had the highest surface acidity when nV:nP is 1:1.6. The selectivity of catalysts is proportional to the surface acidity when nV:nP is lower than 1:3.0. 展开更多
关键词 ammoxidation VPO/SiO2 catalyst substituted toluenes substituted benzonitriles
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Preparation of Spherical MgCl_2/SiO_2/THF-Supported Late-Transition Metal Catalysts for Ethylene Polymerization 认领 引用
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作者 Bai Wei Gao Xianglu +2 位作者 Wu Haotian Cao Chengang Jiang Tao 《China Petroleum Processing & Petrochemical Technology》 CAS 2014年第3期77-83,共7页
A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6... A facile and user friendly technique to immobilize the late-transition metal complexes on spherical MgCl2/SiO2/THF support has been developed. The spherical MgCl2/SiO2/THF-supported late-transition metal catalysts 2,6-bis-[1-(2,6-dimethylphenylimino)ethyl]pyridine iron(II) dichloride(SC-A) and 1,4-bis(2,6-dimethylphenyl)- acenaphthene diimine nickel(II) dibromide(SC-B) for ethylene polymerization has been prepared by spray-drying technique using tetrahydrofuran suspension containing MgCl2, SiO2 and late-transition metal complexes. The catalysts were characterized by BET, XRD, SEM and the polymers were analyzed using GPC, DSC and 13C-NMR. The test results show that spray-drying is a very effective method for immobilizing late-transition metal catalysts for ethylene polymerization. Among six kinds of cocatalysts for olefin polymerization, TMA and TEA were confirmed to be more effective than other compounds for the ethylene polymerization system using the catalyst SC-A. For the case of the catalyst SC-B, DEAC showed the best performance as cocatalysts in ethylene polymerization. The replication of the catalyst morphology was found in the resultant polyethylene. 展开更多
关键词 MgCl2/SiO2/THF support late-transition metal catalyst polymerization of ethylene spray-drying
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CO_2 HYDROGENATION OVER SiO_2-SUPPORTED HETEROBINUCLEAR METAL COMPLEX CATALYSTS 认领 引用
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作者 Chang Ping SHAO 《Chinese Chemical Letters》 SCIE CAS 1995年第12期1081-1082,共2页
The SiO2-Supported (PPh3)2HPt(μ-CO) (μ-PPh2)M(CO) 4 (M-Cr.Mo, W) complel catalysts catalyzing CO2 hydrogenation are reported.The catalysts exhibited high catalytic activity and selectivity toward oxygenates
关键词 SiO2 OVER SUPPORTED HETEROBINUCLEAR HYDROGENATION METAL CO2 CATALYSTS 二氧化碳
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CATALYTIC PERFORMANCE OF ETHYLENE HYDROFORMYLATION OVER[H_XRu_3(CO)_9(CCO)]2-X/SiO_2-Al_2O_3,SiO_2 AND MgO(X=0-2)CATALYSTS 认领 引用
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作者 Feng Shou XIAO RuRen XU Masaru ICHIKAWA Duward F.SHRIVER Xie Xian GUO 《Chinese Chemical Letters》 SCIE CAS 1991年第7期579-580,共2页
The various surface species[H_XRu_3(CO)_9(CCO)]2-X(X=0-2)prepared from impregnation of[PPN]_2[Ru_3(CO)_9(CCO)]on SiO_2-Al_2O_3,SiO_2 and MgO show quite different activities and selectivities for oxygenates and etha... The various surface species[H_XRu_3(CO)_9(CCO)]2-X(X=0-2)prepared from impregnation of[PPN]_2[Ru_3(CO)_9(CCO)]on SiO_2-Al_2O_3,SiO_2 and MgO show quite different activities and selectivities for oxygenates and ethane in ethylene hydroformylation. 展开更多
关键词 CCO X=0-2)CATALYSTS CATALYTIC PERFORMANCE OF ETHYLENE HYDROFORMYLATION OVER[HXRu3 X SiO2-Al2O3,SiO2 AND MgO MgO Al
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Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5-MoO3/TiO2-CeO2 catalyst 认领 引用 被引量：11
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作者 Chengqiang Zheng Teng Cheng +2 位作者 Linjun Yang Hao Wu Hongmei Fan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第5期279-291,共13页
The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition beha... The deposition of NH4 HSO4 and the poisoning effect of SO2 on SCR catalyst are the main obstacles that restrict the industrial application of CeO2-doped SCR catalysts.In this work,deposited NH4 HSO4 decomposition behavior and SO2 poisoning over V2 O5-MoO3/TiO2 catalysts modified with CeO2 and SiO2 were investigated.By the means of characterization analysis,it was found that the addition of SiO2 into VMo/Ti-Ce had an impact on the interaction existed between catalyst surface atoms and NH4 HSO4.Temperatureprogrammed methods and in situ diffused reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments indicated that the doping of SiO2 promoted the decomposition of deposited NH4 HSO4 on VMo/Ti-Ce catalyst surface by reducing the thermal stability of NH4 HSO4 and enhancing the NH4 HSO4 reactivity with NO in low temperature.And this improvement may be the reason for the better catalytic activity than VMo/Ti-Ce in the case of NH4 HSO4 deposition.Accompanied with cerium sulfate species generated over catalyst surface,the conversion of SO2 to SO3 was inhibited in SiCe mixed catalyst.The addition of SiO2 could promote the decomposition of cerium sulfate,which may be a potential strategy to enhance the resistance of SO2 poisoning over CeO2-modifed catalysts. 展开更多
关键词 CeO2-doped SCR catalyst SiO2 addition NH4HSO4 decomposition SO2 poisoning Cerium sulfate
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SiO_2/Au核壳结构纳米粒子的制备及表征 认领 引用 被引量：6
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作者 胡永红 容建华 +1 位作者 刘应亮 满石清 《无机化学学报》 SCIE CAS 北大核心 2005年第11期1672-1676,共5页
通过以金纳米粒子为表面晶种和壳生长的方法制备了金纳米壳包覆二氧化硅的复合纳米粒子。采用TEM和UV-Vis对复合粒子进行了表征和研究,结果表明所得到的复合粒子粒径均匀、金纳米壳光滑完整,且壳厚度可通过反应物的用量来控制。当核半... 通过以金纳米粒子为表面晶种和壳生长的方法制备了金纳米壳包覆二氧化硅的复合纳米粒子。采用TEM和UV-Vis对复合粒子进行了表征和研究,结果表明所得到的复合粒子粒径均匀、金纳米壳光滑完整,且壳厚度可通过反应物的用量来控制。当核半径与壳厚度之比在4到13之间变化时,复合粒子的光学共振峰在可见光区到近红外光区范围内可发生大于500nm波长的移动。 展开更多
关键词 SiO2胶体粒子 Au纳米粒子 SiO2/Au核壳粒子 等离子体共振吸收
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氨基功能化有序介孔SiO_2薄膜组装Au纳米粒子复合材料的可调色散性质 认领 引用 被引量：4
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作者 方靖岳 秦石乔 +3 位作者 张学骜 李新华 王飞 常胜利 《高等学校化学学报》 SCIE CAS CSCD 北大核心 2011年第7期1460-1465,共6页
以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷(P123)为模板剂,采用共溶胶的蒸发诱导自组装方法制备了氨基功能化介孔SiO2薄膜,然后利用氯金酸(HAuCl4)与介孔SiO2薄膜孔道内壁的氨基之间的中和反应组装Au纳米粒子,制备得到Au/SiO2纳米复合材料.用... 以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷(P123)为模板剂,采用共溶胶的蒸发诱导自组装方法制备了氨基功能化介孔SiO2薄膜,然后利用氯金酸(HAuCl4)与介孔SiO2薄膜孔道内壁的氨基之间的中和反应组装Au纳米粒子,制备得到Au/SiO2纳米复合材料.用TEM,XRD和UV-Vis光谱对材料进行了测试.结果表明,无水乙醇萃取获得的氨基功能化介孔SiO2薄膜具有高度有序的介孔结构;利用中和反应及氢气氛围煅烧还原的方法将Au纳米粒子组装在介孔SiO2薄膜的孔道中,Au纳米颗粒分散均匀且晶化良好,表现出(111)晶面的择优取向生长;随着中和反应时间的延长,Au纳米颗粒的粒径呈增长趋势,Au/SiO2纳米复合材料的吸收光谱发生红移,表明存在Au量子点的量子尺寸效应,即说明通过改变浸渍时间可以调控Au/SiO2纳米复合材料的色散性质. 展开更多
关键词 有序介孔SiO2薄膜 氨基功能化 Au纳米粒子 吸收光谱 色散性质
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稀土掺杂SiO_2与SiO_2@Au纳米球 认领 引用 被引量：6
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作者 刘四运 徐晟 彭卿 《无机化学学报》 SCIE CAS 北大核心 2007年第9期1657-1661,共5页
0引言荧光标记技术在化学、生物、医药领域有着广泛的应用。除传统的有机荧光染料外,目前常用的荧光标记的材料主要有半导体量子点、稀土掺杂纳米晶、荧光高分子粒子和荧光SiO2纳米球。与其他材料相比，荧光SiO2球具有光稳定性高、毒性... 0引言荧光标记技术在化学、生物、医药领域有着广泛的应用。除传统的有机荧光染料外,目前常用的荧光标记的材料主要有半导体量子点、稀土掺杂纳米晶、荧光高分子粒子和荧光SiO2纳米球。与其他材料相比，荧光SiO2球具有光稳定性高、毒性低、亲水性好且生物相容、表面易修饰上与生物分子相连接的基团、尺寸均一可调等诸多优点，因而特别适合作为生物标记材料，备受关注。 展开更多
关键词 荧光 SiO2纳米球 稀土掺杂 Au纳米粒子
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(Au,Ag,Cu)/SiO_2二元合金分散复合薄膜非线性光吸收的Mie理论模拟 认领 引用 被引量：3
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作者 严丽平 张波萍 +2 位作者 赵翠华 李顺 王士京 《无机化学学报》 SCIE CAS CSCD 北大核心 2011年第6期1105-1110,共6页
用修正的Mie理论,模拟计算分析了(Ag,Cu)/SiO2、(Au,Cu)/SiO2、(Ag,Au)/SiO2合金纳米颗粒分散体系的理论吸收光谱。研究发现当二元金属纳米颗粒以合金形式存在时,在一个波段处出现SPR吸收峰,峰位与合金组元的相对含量相关。模拟出的理... 用修正的Mie理论,模拟计算分析了(Ag,Cu)/SiO2、(Au,Cu)/SiO2、(Ag,Au)/SiO2合金纳米颗粒分散体系的理论吸收光谱。研究发现当二元金属纳米颗粒以合金形式存在时,在一个波段处出现SPR吸收峰,峰位与合金组元的相对含量相关。模拟出的理论吸收光谱与实验结果一致。 展开更多
关键词 Mie理论 (Ag,Cu)/SiO2 (Au,Cu)/SiO2和(Ag,Au)/SiO2二元合金复合薄膜 光吸收谱
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High Activity and Selectivity of Cu/SiO_2 Catalyst for the Direct Synthesis of Indole 认领 引用 被引量：3
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作者 Lei SHI Jun Ming SUN +2 位作者 Xin Ping WANG Xan Yun SU Tian Xi CAI 《Chinese Chemical Letters》 SCIE CAS 2002年第3期211-212,共2页
Copper supported over silica exhibited very high activity and selectivity for the direct synthesis of indole at atmospheric pressure. Under the reaction temperature of 325C,the yield of indole could obtain 88%.
关键词 Cu/SiO2 catalyst direct synthesis of indole aniline ethylene glycol.
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壳聚糖/PEI凝胶模板法制备Au/SiO_2复合纳米粒子 认领 引用 被引量：5
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作者 党婕 艾媛媛 郑行望 《陕西师范大学学报（自然科学版）》 CAS CSCD 北大核心 2014年第1期56-61,共6页
采用反相微乳液法,以壳聚糖/PEI复合水凝胶作为模板成功制备了核壳型Au/SiO2复合纳米粒子.利用透射电镜、紫外可见吸收光谱以及原子吸收光谱对该复合纳米粒子进行了表征和研究.结果表明:该复合纳米粒子呈现球状并为核壳结构,粒径约为70... 采用反相微乳液法,以壳聚糖/PEI复合水凝胶作为模板成功制备了核壳型Au/SiO2复合纳米粒子.利用透射电镜、紫外可见吸收光谱以及原子吸收光谱对该复合纳米粒子进行了表征和研究.结果表明:该复合纳米粒子呈现球状并为核壳结构,粒径约为70nm,核和壳的厚度分别约为25nm和45nm,金纳米粒子在该复合纳米粒子的核部分呈现不连续状态,这种状态能够提供较大的比表面积.同时研究了该复合纳米粒子的催化活性,并发现其具有较好的催化活性. 展开更多
关键词 水凝胶模板 Au SiO2复合纳米粒子 壳聚糖
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First-principles Study on Adsorption of Au Atom on Hydroxylated SiO2 Surface 认领 引用 被引量：2
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作者 WAN Miao HE Kaihua +1 位作者 CHEN Qili HONG Hanlie 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第6期1184-1188,共5页
Adsorption of single gold(Au)atom at three kinds of sites(hollow,bridge and top)on the hydroxylatedβ-cristobalite SiO2(111)surface was studied using the first-principles calculations with general gradient approximati... Adsorption of single gold(Au)atom at three kinds of sites(hollow,bridge and top)on the hydroxylatedβ-cristobalite SiO2(111)surface was studied using the first-principles calculations with general gradient approximation(GGA).The results of adsorption energies and density of electronic states(DOS)suggest that the hollow and bridge sites have the basically equal capability of binding Au,while the ability of the Top site is weaker.Two new energy levels emerge after the adsorption at all sites;in DOS of the Hollow configuration,one locates at-0.15 eV,composed of Au 5d and O 2p electronic states,another just crosses through the Fermi level,consisting of Au 6s,H 1s and O 2p.In addition,Mulliken population analyses indicate that electron transfer takes place between the Au atom and the surface H and O atoms in the Hollow and Bridge configurations,which can be used to interpret the adsorption of Au onto the positions.However,neither H nor O chemically bonds with Au atom. 展开更多
关键词 Au adsorption hydroxylated SiO2 first-principles general gradient approximation
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Au/FeO_x-TiO_2 as an efficient catalyst for the selective hydrogenation of phthalic anhydride to phthalide 认领 引用 被引量：2
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作者 Ying Xin Liu Tie Feng Xing +2 位作者 Yi Ming Luo Xiao Nian Li Wei Yan 《Chinese Chemical Letters》 SCIE CAS 2010年第11期1322-1325,共4页
Au/FeOx-TiO2,prepared by deposition-precipitation method,is an efficient and stable catalyst for the liquid phase selective hydrogenation of phthalic anhydride to phthalide under mild reaction conditions.
关键词 Au/FeOx-TiO2 catalyst Phthalic anhydride Liquid phase hydrogenation Phthalide
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SiO_2/CH/Au复合黑腔诊断孔电火花加工技术 认领 引用 被引量：2
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作者 谢军 张昭瑞 +6 位作者 梅鲁生 黄燕华 朱磊 刘峰 张海军 李国 宋成伟 《强激光与粒子束》 EI CAS CSCD 北大核心 2014年第11期72-75,共4页
通过电火花加工技术,采用含碳较高的煤油作为电介质,利用导电性能及加工性能较好的紫铜作电极材料,实现了SiO2/CH/Au复合黑腔侧表面方形诊断孔的精密加工。采用OLYMPUS STM6测量显微镜对诊断孔尺寸,结果表明:孔的尺寸加工精度可控制在&#... 通过电火花加工技术,采用含碳较高的煤油作为电介质,利用导电性能及加工性能较好的紫铜作电极材料,实现了SiO2/CH/Au复合黑腔侧表面方形诊断孔的精密加工。采用OLYMPUS STM6测量显微镜对诊断孔尺寸,结果表明:孔的尺寸加工精度可控制在±10μm内,同一电极加工的诊断孔尺寸一致性可控制在±5μm内。采用扫描电镜能谱分析SiO2/CH/Au加工导电层的成分,结果表明:电火花加工过程中,由于电介质分解生成游离态的碳以及电极材料铜熔融后沉积在CH和SiO2层表面,形成辅助导电层。通过加工辅助导电层,产生的瞬时高温使SiO2和CH层熔融气化,从而实现对绝缘层的加工。 展开更多
关键词 SiO2/CH/Au 黑腔 诊断孔 电火花加工 惯性约束聚变
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