Microwave plasma assisted preparation of Pd-nanoparticles with controlled dispersion on woven activated carbon fibres

The low-pressure cold microwave (MW) plasma is shown as an efficient method to increase acidity of the ACF within less than 1 min treatment without affecting the fiber morphol. and strength. The ion-exchange capacity was 1.6 times higher compared to the non-treated ACF sample. Selective removal of the carboxylic groups from the ACF surface by the air-MW-plasma allows to keep the phenolic groups intact. Palladium was deposited on ACF from [Pd(NH3)4]Cl2 soln. via ion-exchange with the protons of the phenolic surface groups. Surface phenolic groups were able to chem. anchor Pd in cationic form, leading after redn. in H2 to small Pd Deg nanoparticles (<3 nm). The Pd dispersion was measured by CO pulse adsorption and confirmed by the TEM anal. Heating of the Pd/ACF catalysts in H2 at 573-773 K is necessary to reduce Pd(II) to Pd Deg. This redn. can be also achieved by the H2-MW-plasma treatment in less than 1 min with the corresponding saving of energy. [on SciFinder (R)]


Published in:
Catalysis Today, 102-103, 133-141
Year:
2005
Keywords:
Note:
CAN 143:14012
67-3
Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms
Ecole Polytechnique Federal de Lausanne, LGRS-EPFL,Lausanne,Switz.
Journal
0920-5861
written in English.
7440-05-3P (Palladium) Role: CAT (Catalyst use), CPS (Chemical process), PEP (Physical, engineering or chemical process), PRP (Properties), SPN (Synthetic preparation), PREP (Preparation), PROC (Process), USES (Uses) (microwave plasma assisted prepn. of Pd-nanoparticles with controlled dispersion on woven activated carbon fibers)
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 Record created 2006-04-18, last modified 2018-12-03

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