Surface Diffusion of Pt Clusters in/on SiO2 Matrix at Elevated Temperatures and Their Improved Catalytic Activities in Benzene Oxidation

CORC > 过程工程研究所 > 中国科学院过程工程研究所 > 研究所（批量导入）

	Surface Diffusion of Pt Clusters in/on SiO2 Matrix at Elevated Temperatures and Their Improved Catalytic Activities in Benzene Oxidation
	Liu, Gang 1,2; Yang, Kun 1; Li, Jiaqi 1,2; Tang, Wenxiang 1,2; Xu, Junbo 1; Liu, Haidi 1; Yue, Renliang 1; Chen, Yunfa1
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2014-10-02
卷号	118 期号:39 页码:22719-22729
关键词	FLAME SPRAY-PYROLYSIS SUPPORTED PLATINUM CLUSTERS CO OXIDATION NOX STORAGE THERMAL-STABILITY METAL PARTICLES PD REDUCTION HYDROGENATION NANOPARTICLES
ISSN号	1932-7447
其他题名	J. Phys. Chem. C
中文摘要	Pt in/on silica nanoparticles were synthesized by flame spray pyrolysis (FSP) followed by H-2 reduction at different temperature and tested in benzene complete oxidation reaction. The Pt clusters diffusion from the interior to the exterior of the SiO2 matrix followed by aggregation in/on the SiO2 matrix was observed with elevated temperature (3001100 degrees C) and time (05 h). The aggregation of the Pt clusters on the surface of the SiO2 matrix was also evidenced by X-ray diffraction (XRD), transmission electron microscopy (TEM), and CO-pulse chemisorption. The effect of heat treatment temperature and time on the Pt/SiO2 structure was discussed. In combination with the experimental study, a further physical model describing the structural transformation was developed to complementarily depict the diffusion and aggregation process. The developed physical model correlated well with the experimental data. The catalytic activities increased with the elevated temperature until Pt3Si species was present at 1100 degrees C. The improved catalytic activities were attributed to the structural transformation induced by the elevated temperature. The rate of the Pt clusters diffusion to the surface and aggregation on the surface determined the Pt dispersion, which is the key mechanism in determining the catalytic activity.
英文摘要	Pt in/on silica nanoparticles were synthesized by flame spray pyrolysis (FSP) followed by H-2 reduction at different temperature and tested in benzene complete oxidation reaction. The Pt clusters diffusion from the interior to the exterior of the SiO2 matrix followed by aggregation in/on the SiO2 matrix was observed with elevated temperature (3001100 degrees C) and time (05 h). The aggregation of the Pt clusters on the surface of the SiO2 matrix was also evidenced by X-ray diffraction (XRD), transmission electron microscopy (TEM), and CO-pulse chemisorption. The effect of heat treatment temperature and time on the Pt/SiO2 structure was discussed. In combination with the experimental study, a further physical model describing the structural transformation was developed to complementarily depict the diffusion and aggregation process. The developed physical model correlated well with the experimental data. The catalytic activities increased with the elevated temperature until Pt3Si species was present at 1100 degrees C. The improved catalytic activities were attributed to the structural transformation induced by the elevated temperature. The rate of the Pt clusters diffusion to the surface and aggregation on the surface determined the Pt dispersion, which is the key mechanism in determining the catalytic activity.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
研究领域[WOS]	Chemistry ; Science & Technology - Other Topics ; Materials Science
关键词[WOS]	FLAME SPRAY-PYROLYSIS ; SUPPORTED PLATINUM CLUSTERS ; CO OXIDATION ; NOX STORAGE ; THERMAL-STABILITY ; METAL PARTICLES ; PD ; REDUCTION ; HYDROGENATION ; NANOPARTICLES
收录类别	SCI
原文出处	://WOS:000342652000036
语种	英语
WOS记录号	WOS:000342652000036
公开日期	2014-12-01
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/11680]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Gang,Yang, Kun,Li, Jiaqi,et al. Surface Diffusion of Pt Clusters in/on SiO2 Matrix at Elevated Temperatures and Their Improved Catalytic Activities in Benzene Oxidation[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2014,118(39):22719-22729.
APA	Liu, Gang.,Yang, Kun.,Li, Jiaqi.,Tang, Wenxiang.,Xu, Junbo.,...&Chen, Yunfa.(2014).Surface Diffusion of Pt Clusters in/on SiO2 Matrix at Elevated Temperatures and Their Improved Catalytic Activities in Benzene Oxidation.JOURNAL OF PHYSICAL CHEMISTRY C,118(39),22719-22729.
MLA	Liu, Gang,et al."Surface Diffusion of Pt Clusters in/on SiO2 Matrix at Elevated Temperatures and Their Improved Catalytic Activities in Benzene Oxidation".JOURNAL OF PHYSICAL CHEMISTRY C 118.39(2014):22719-22729.