Catalytic Activity and Selectivity of Pt/MWCNTs System in Hydrodechlorination of Freon CFC-12

Kuan-Nan Lin 1Magdalena Bonarowska 2Leszek Stobinski 2Zbigniew Karpinski 2Hong-Ming Lin 1

1. Tatung University, Department of Material Engineering (TTU), 40 ChungShan North Road, 3rd Section Taipei 104, R.O.C., Taipei 10461, Taiwan
2. Polish Academy of Sciences, Institute of Physical Chemistry, Kasprzaka 44/52, Warszawa 01-224, Poland

Abstract

Carbon nanotubes exhibit unique physico-chemical properties and they may be used as a basis for other nanostructured materials, such as nano-powder catalysts. For example, multiwalled carbon nanotubes (MWCNTs) can be used as a catalyst support where catalytic active metal nano-particles may be deposited onto the functionalized MWCNTs surface.

It is known that activity and selectivity of metallic catalyst significantly depend on its preparation and subsequent modification, such as sintering, calcination and/or reduction. Pt/MWCNTs catalyst with 23 wt. % content of Pt was prepared by polyol process using H2PtCl6 as Pt precursor and ethylene glycol (EG) as a reducing agent.

Uniform distribution of Pt nano-particles on the surface of functionalized MWCNTs was obtained. The size of Pt nanoparticles varied from 3 to 10 nm. Further annealing and reducing of Pt/MWCNTs catalyst in hydrogen atmosphere were performed, obtaining four various samples. The activity and selectivity of each Pt/MWCNTs sample in the hydrodechlorination reaction of freon CFC-12 (CCl2F2) was determined. TEM, XRD and Raman spectra were used to characterize each Pt/MWCNTs sample.

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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium B, by Kuan-Nan Lin
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-16 06:25
Revised:   2009-06-07 00:44
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