Study on State-sensitive Observation of Gold and Platinum Nano-particles and Promoter Sites by XAFS combined with X-ray Fluorescence Spectrometry
Study on State-sensitive Observation of Gold and Platinum Nano-particles and Promoter Sites by XAFS combined with X-ray Fluorescence Spectrometry
批准号:
17550073
负责人:
IZUMI Yasuo
金额:
$1.09万
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
2005
资助国家:
日本
项目状态:
已结题
起止时间:
2005 至 2006
中文摘要
这项工作是我们用于催化剂和环境材料的状态敏感XAFS(x射线吸收精细结构)研究的延伸。对Pt-Sn催化剂进行了状态敏感的Sn Kα_1选择XAFS光谱测量,该光谱抑制了Sn K能级的芯孔寿命展宽。结果表明,在SiO_2表面高度分散的Pt粒子(平均粒径约为1 nm)上存在Sn位点,Sn的电子态也得到了证实。并合成了一系列Au/TiO_2催化剂。平均Au粒度均匀控制在2.9 ~ 8.7 nm之间。基于状态敏感的Au l - α_1选择XAFS,证实了Au纳米颗粒中存在中性1、δ^-和δ^+位点。第一个主要的、显著的进展是由于SPring-8光束线x射线稳定性的提高,状态敏感XAFS的能量分辨率得到了提高。梁的位置稳定性表现出类似的效果,以减少梁的尺寸在样品位置。因此,金纳米颗粒中每个位点的状态敏感结构分析变得更加熟悉,技术要求更低。其次,结合我们在可见光下激发钒催化剂的研究(优先领域研究“纳米动力学”),建立了非反应条件下状态敏感XAFS的测量技术。结果表明,在非反应条件下,我们成功地直接检测到Au(δ^+)位给电子到O_2分子。该测量被认为是对低温CO氧化过程中关键中间体的检测。
英文摘要
This work was performed as the extension of series of our state-sensitive XAFS(X-ray absorption fine structure) studies applied to catalysts and environmental materials. State-sensitive Sn Kα_1-selecting XAFS spectra were measured for Pt-Sn catalysts suppressing the core-hole lifetime broadening of Sn K level. The presence of Sn sites adsorbed on Pt particles (mean particle size approximately equal 1 nm) highly dispersed over SiO_2 surface and the electronic state of Sn were demonstrated. Also, series of Au/TiO_2 catalysts were synthesized. The mean Au particle size was controlled homogeneous to between 2.9 and 8.7 nm. Based on state-sensitive Au Lα_1-selecting XAFS, the presence of neutra1, δ^-, and δ^+ sites were demonstrated in Au nano-particles.First major, remarkable progress during this period was that the improvement of energy resolution of state-sensitive XAFS due to the advancement of X-ray beam stability at SPring-8 beamline. The beam position stability exhibited similar effect to reduce the beam size at the sample position. As the result, the state-sensitive structural analyses of each site in Au nano-particles became more familiar, technically less-demanding. Second, in common with our study of vanadium catalysts excited under visible light (Priority Area Research "Nano-Dynamics"), measurement technique of state-sensitive XAFS under on-reaction conditions was established. As the result, we were successful to directly detect electron donation from Au(δ^+)sites to O_2 molecule under on-reaction condition. The measurement is regarded as to detect the key intermediate in the low-temperature CO oxidation.
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State-sensitive Monitoring of Active andPromoter Sites. Applications to Au/titania and Pt-Sn/silica Catalysts by XAFS Combined with X-ray Fluorescence Spectrometry
活性位点和启动子位点的状态敏感监控。
DOI:
--
发表时间:
2007
期刊:
X-Ray Absorption Fine Structure 13th International Conference Vol.882
影响因子:
--
作者:
[Yasuo Izumi, Dishad Masih, Jean-Pierre Candy, Hideaki Yoshitake, Yasuko Terada, Hajime Tanida, and Tomoya Uruga]
通讯作者:
and Tomoya Uruga
Creation of Micro and Mesoporous Fe^<III> Materials utillzing Organic Template followed by Carboxylates Exchange for the Low Concentrations of Arsenic Removal
利用有机模板制备微孔和介孔 Fe^<III> 材料,然后进行羧酸盐交换以实现低浓度除砷
DOI:
--
发表时间:
2006
期刊:
Microporous and Mesoporous Materials 94・1-3
影响因子:
--
作者:
[Yasuo Izumi, Dilshad Masih, KenichiAika, Yoshimi Seida]
通讯作者:
Yoshimi Seida
X-ray Absorption Fine Structure Combined with X-ray Fluorescence Spectrometry. Part 18. Tin Site Structure of Pt-Sn Catalyst
X 射线吸收精细结构与 X 射线荧光光谱法相结合。
DOI:
--
发表时间:
2007
期刊:
Materials Letters 61(18)
影响因子:
--
作者:
[Yasuo Izumi, Dilshad Masih, Eric Roisin, Jean-Pierre Candy, Hajime Tanida, and Tomoya Uruga]
通讯作者:
and Tomoya Uruga
Erratum to "Creation of Micro and Mesoporous Fe^<III> Materials utilizing Organic Template followed by Carboxylates Exchange for the Low Concentrations of Arsenic Removal"
“利用有机模板创建微孔和介孔 Fe^<III> 材料,然后进行羧酸盐交换以实现低浓度砷去除”的勘误表
DOI:
--
发表时间:
2007
期刊:
Microporous and Mesoporous Materials 99・3
影响因子:
--
作者:
[Yasuo Izumi, Dilshad Masih, Ken-ichi Aika, Yoshimi Seida]
通讯作者:
Yoshimi Seida
Characterization of Intercalated Iron(III) Nanoparticles and Oxidative Adsorption of Arsenite on Them Monitored by X-ray Absorption Fine Structure Combined with Fluorescence Spectrometry
X射线吸收精细结构结合荧光光谱法监测插层铁(III)纳米粒子的表征及其上亚砷酸盐的氧化吸附
DOI:
--
发表时间:
2005
期刊:
Journal of Physical Chemistry B 109(8)
影响因子:
--
作者:
[Yasuo Izumi, Dilshad Masih, Ken-ichi Aika, Yoshimi Seida]
通讯作者:
Yoshimi Seida
共 18 条
Development of Photocatalysts for CO2 Reduction and Selective CO Oxidation and Monitoring of the Mechanism by Selective Spectroscopy
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批准号:22550117
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项目类别:Grant-in-Aid for Scientific Research (C)
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资助金额:$3.24万
-
财政年份:2010
-
负责人:IZUMI Yasuo
-
依托单位:
Production of High-Energy-Resolution Fluorescence Spectrometer for X-ray Absorption Fine Structure Applied to Site Selection and the Detection of Trace Amounts of Content
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批准号:13555230
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项目类别:Grant-in-Aid for Scientific Research (B)
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资助金额:$5.82万
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财政年份:2001
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负责人:IZUMI Yasuo
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依托单位: