Watching nanoparticles grow:: The mechanism and kinetics for the formation of TiO2-supported platinum nanoparticles

被引：108

作者：

Chupas, Peter J. ^{[1
]}

Chapman, Karena W.

Jennings, Guy

Lee, Peter L.

Grey, Clare P.

机构：

[1] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

[2] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2007年 / 129卷 / 45期

关键词：

D O I：

10.1021/ja076437p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The formation of supported Pt nanoparticles during the reduction of pt(4+) on TiO2 under H-2 (4% in He) gas flow has been monitored using a differential approach to time-resolved pair distribution function (PDF) analysis of high-energy X-ray scattering data. The reduction of Pt4+ species was found to follow pseudo-zero-order reaction kinetics, with an activation energy of 0.52 eV. Reaction data obtained at constant temperature (100, 150, and 200 degrees C) and during heating (0-200 degrees C) indicate that the growth of nanoparticles from the reduce Pt-0 species depends strongly on temperature and proceeds more rapidly upon heating.

引用

页码：13822 / +

页数：4

共 25 条

[1] Pt L-edge XANES as a probe of Pt clusters [J].

Ankudinov, AL ;

Rehr, JJ ;

Low, JJ ;

Bare, SR .

JOURNAL OF SYNCHROTRON RADIATION, 2001, 8 (02) :578-580

[2] Role of cluster size in catalysis:: Spectroscopic investigation of γ-Al2O3-supported Ir4 and Ir6 during ethene hydrogenation [J].

Argo, AM ;

Odzak, JF ;

Gates, BC .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2003, 125 (23) :7107-7115

[3] A mechanism for transition-metal nanoparticle self-assembly [J].

Besson, C ;

Finney, EE ;

Finke, RG .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (22) :8179-8184

[4] The problem with determining atomic structure at the nanoscale [J].

Billinge, Simon J. L. ;

Levin, Igor .

SCIENCE, 2007, 316 (5824) :561-565

[5] Applications of an amorphous silicon-based area detector for high-resolution, high-sensitivity and fast time-resolved pair distribution function measurements [J].

Chupas, Peter J. ;

Chapman, Karena W. ;

Lee, Peter L. .

JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2007, 40 :463-470

[6] Rapid-acquisition pair distribution function (RA-PDF) analysis [J].

Chupas, PJ ;

Qiu, XY ;

Hanson, JC ;

Lee, PL ;

Grey, CP ;

Billinge, SJL .

JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2003, 36 :1342-1347

[7] Direct observation of host-guest hydrogen bonding in the zeolite NaY/chloroform system by neutron scattering [J].

Eckert, J ;

Draznieks, CM ;

Cheetham, AK .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (02) :170-171

[8]

Egami T, 2003, PERGAMON MATER SER, V7, pVII

[9] THE ATOMIC-STRUCTURE OF PLATINUM AGGREGATES ENCAGED IN Y-ZEOLITE - STRUCTURE IN THE COURSE OF BENZENE HYDROGENATION [J].

GALLEZOT, P ;

BERGERET, G .

JOURNAL OF CATALYSIS, 1981, 72 (02) :294-302

[10] CO oxidation catalyzed by supported gold: Cooperation between gold and nanocrystalline rare-earth supports forms reactive surface superoxide and peroxide species [J].

Guzman, J ;

Carrettin, S ;

Fierro-Gonzalez, JC ;

Hao, YL ;

Gates, BC ;

Corma, A .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2005, 44 (30) :4778-4781

← 1 2 3 →