Supported platinum nanoparticles by Supercritical Deposition

Deposition of Platinum Nanoparticles, Synthesized in Water-in-Oil Microemulsions, on Alumina Supports

Cover ImageCompetence Centre for Catalysis, Department of Applied Surface Chemistry, Department of Applied Physics, and Department of Experimental Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden

Cover ImageLangmuir, 2002, 18 (5), pp 1811–1818

DOI: 10.1021/la0110949

Section:

Abstract

Platinum nanoparticles were prepared in water-in-oil microemulsions and deposited on γ-alumina using two different methods. In the first method, the alumina support was added to the particle suspension and the microemulsion was subsequently destabilized by addition of tetrahydrofurane, whereby the particles were deposited on the alumina support. In the other method, the platinum nanoparticles were transferred to an aqueous solution were they were redispersed by a stabilizing surfactant prior to addition of the alumina support. The size of the microemulsion droplets and of the unsupported platinum particles was in the range of a few nanometers as measured by a dynamic light scattering technique (photon correlation spectroscopy). The size of the unsupported platinum nanoparticles and of the particles deposited on alumina was studied by transmission electron microscopy. Both methods for platinum particle deposition resulted in some degree of particle agglomeration, the first probably because of too-fast destabilization of the microemulsion and the second due to inefficient redispersion of the Pt particles when transferred to the aqueous phase. All samples investigated showed high catalytic activity for CO oxidation by oxygen.Cover Image dispersion method where a relatively weak interaction was achieved between the redispersed Pt particles and the alumina.

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Is what we see based on what we believe?

by PositiveOption

Because I believe
1 Corinthians 3:19 For the wisdom of this world is foolishness with God. For it is written, He taketh the wise in their own craftiness.
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by PositiveOption

One who loves God will see what they believe and the ones who trust science will believe what they see
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That means I see that, because the cell's nanotechnology and complexity on multiple levels is unmatched by all the engineers on the earth combined, it is a paradox if it comes from a natural cause
But Science does not see it that way they say there two ways to get a efficient design?

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by bionecr

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