Catalytic activity of a soft composite material: Nanoparticle location-activity relationship

被引：4

作者：

Mallick, Kaushik ^{[1
]}

Mondal, Kartick ^{[2
]}

Witcomb, Mike ^{[3
]}

Deshmukh, Amit ^{[2
]}

Scurrell, Mike ^{[2
]}

机构：

[1] MINTEK, Adv Mat Div, ZA-2125 Randburg, South Africa

[2] Univ Witwatersrand, Inst Mol Sci, Sch Chem, ZA-2050 Johannesburg, South Africa

[3] Univ Witwatersrand, Electron Microscope Unit, ZA-2050 Johannesburg, South Africa

来源：

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS | 2008年 / 150卷 / 01期

关键词：

metal-polymer composite; nanoparticles; hydrogenation; TEM;

D O I：

10.1016/j.mseb.2008.01.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A nanostructure, fiber-shaped morphology of a conjugated polymer (poly-5 amono-ortho-cresol, PAOC) has been synthesized using palladium acetate as the oxidizing agent. A one pot, in situ chemical synthesis approach has been utilized in which palladium acetate was reduced during the polymerization process of 5-amono-o-cresol (AOC) and formed well dispersed palladium nanoparticles in the polymer fibers. The resultant composite material was characterized by means of optical, thermo and micro-analytical techniques. The elemental identity of the nanoparticles was determined by means of electron energy loss spectroscopy (EELS) mapping using analytical transmission electron microscopy (TEM). Subsequently, the sample was used as a catalyst for a model gas-phase hydrogenation reaction. The activation and deactivation behaviour of the catalyst as a function of temperature is discussed in the light of different phase transition points of the polymer as well as the orientation of the palladium nanoparticles. The fact that palladium nanoparticles (similar to 2 nm) were uniformly distributed throughout the polymer matrix makes the composite material an excellent hybrid structure. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：43 / 49

页数：7

共 41 条

[1] Thermal decomposition of ethylene-comonomer mixtures under high pressure [J].

Albert, J ;

Luft, G .

AICHE JOURNAL, 1999, 45 (10) :2214-2222

[2] Self-assembly of a two-dimensional superlattice of molecularly linked metal clusters [J].

Andres, RP ;

Bielefeld, JD ;

Henderson, JI ;

Janes, DB ;

Kolagunta, VR ;

Kubiak, CP ;

Mahoney, WJ ;

Osifchin, RG .

SCIENCE, 1996, 273 (5282) :1690-1693

[3] Nanocomposite materials for optical applications [J].

Beecroft, LL ;

Ober, CK .

CHEMISTRY OF MATERIALS, 1997, 9 (06) :1302-1317

[4] SYNTHESIS OF THIOL-DERIVATIZED GOLD NANOPARTICLES IN A 2-PHASE LIQUID-LIQUID SYSTEM [J].

BRUST, M ;

WALKER, M ;

BETHELL, D ;

SCHIFFRIN, DJ ;

WHYMAN, R .

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1994, (07) :801-802

[5] Polyaniline nanofibers prepared by dilute polymerization [J].

Chiou, NR ;

Epstein, AJ .

ADVANCED MATERIALS, 2005, 17 (13) :1679-+

[6] Preparation of catalytically efficient precious metallic colloids by γ-irradiation and characterization [J].

Choi, SH ;

Zhang, YP ;

Gopalan, A ;

Lee, KP ;

Kang, HD .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2005, 256 (2-3) :165-170

[7] Catalytic properties of palladium nanoclusters synthesized within diblock copolymer films: hydrogenation of ethylene and propylene [J].

Ciebien, JF ;

Cohen, RE ;

Duran, A .

SUPRAMOLECULAR SCIENCE, 1998, 5 (1-2) :31-39

[8]

COLVIN VL, 1994, NATURE, V370, P354, DOI 10.1038/370354a0

[9] ELECTROLUMINESCENCE FROM CDSE QUANTUM-DOT POLYMER COMPOSITES [J].

DABBOUSI, BO ;

BAWENDI, MG ;

ONITSUKA, O ;

RUBNER, MF .

APPLIED PHYSICS LETTERS, 1995, 66 (11) :1316-1318

[10] Palladium nanoparticles by electrospinning from poly(acrylonitrile-co-acrylic acid)-PdCl2 solutions.: Relations between preparation conditions, particle size, and catalytic activity [J].

Demir, MM ;

Gulgun, MA ;

Menceloglu, YZ ;

Erman, B ;

Abramchuk, SS ;

Makhaeva, EE ;

Khokhlov, AR ;

Matveeva, VG ;

Sulman, MG .

MACROMOLECULES, 2004, 37 (05) :1787-1792

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