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Polymer-stabilized palladium nanoparticles for catalytic membranes: ad hoc polymer fabrication.

Domènech B, Muñoz M, Muraviev DN, Macanás J - Nanoscale Res Lett (2011)

Bottom Line: This paper reports the intermatrix synthesis of Pd0 nanoparticles in sulfonated polyethersulfone with Cardo group membranes and their use as nanocomposite catalytic membrane reactors.The synthesized polymer and the corresponding nanocomposite were characterized by spectroscopic and microscopic techniques.The catalytic efficiency of catalytic membranes was evaluated by following the reduction of p-nitrophenol in the presence of NaBH4.

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Affiliation: Department of Chemical Engineering, UPC, C/Colom, 1, 08222 Terrassa, Barcelona, Spain. Jorge.Macanas@upc.edu.

ABSTRACT
Metal nanoparticles are known as highly effective catalysts although their immobilization on solid supports is frequently required to prevent aggregation and to facilitate the catalyst application, recovery, and reuse. This paper reports the intermatrix synthesis of Pd0 nanoparticles in sulfonated polyethersulfone with Cardo group membranes and their use as nanocomposite catalytic membrane reactors. The synthesized polymer and the corresponding nanocomposite were characterized by spectroscopic and microscopic techniques. The catalytic efficiency of catalytic membranes was evaluated by following the reduction of p-nitrophenol in the presence of NaBH4.

No MeSH data available.


Catalytic performance of Pd-MNPs containing membranes (M0 sample).
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Figure 4: Catalytic performance of Pd-MNPs containing membranes (M0 sample).

Mentions: The results of the catalytic characterization of samples are shown in Figure 4. As it is seen, MNP-free membranes do not exhibit any catalytic activity while the membrane samples containing Pd0-NPs show a clearly pronounced catalytic effect, which is confirmed by a quite fast absorbance decay. However, the attenuation only followed a linear trend after approximately 1 h. In order to understand this issue, it is important to consider that Pd is a classical hydrogen-storage metal [20,21]. Thus, the observed induction period can be associated with hydrogen loading (evolved from the decomposition of NaBH4) into the Pd-NPs, which competes with the catalytic reaction. Once the absorption of hydrogen has reached a saturation value (after the induction/activation period), the catalytic reaction prevails and the reaction rate follows pseudo-first-order kinetics at high extend. In fact, Pd0-NPs can already be partially loaded by hydrogen after the second IMS step (see Equation 2).


Polymer-stabilized palladium nanoparticles for catalytic membranes: ad hoc polymer fabrication.

Domènech B, Muñoz M, Muraviev DN, Macanás J - Nanoscale Res Lett (2011)

Catalytic performance of Pd-MNPs containing membranes (M0 sample).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211501&req=5

Figure 4: Catalytic performance of Pd-MNPs containing membranes (M0 sample).
Mentions: The results of the catalytic characterization of samples are shown in Figure 4. As it is seen, MNP-free membranes do not exhibit any catalytic activity while the membrane samples containing Pd0-NPs show a clearly pronounced catalytic effect, which is confirmed by a quite fast absorbance decay. However, the attenuation only followed a linear trend after approximately 1 h. In order to understand this issue, it is important to consider that Pd is a classical hydrogen-storage metal [20,21]. Thus, the observed induction period can be associated with hydrogen loading (evolved from the decomposition of NaBH4) into the Pd-NPs, which competes with the catalytic reaction. Once the absorption of hydrogen has reached a saturation value (after the induction/activation period), the catalytic reaction prevails and the reaction rate follows pseudo-first-order kinetics at high extend. In fact, Pd0-NPs can already be partially loaded by hydrogen after the second IMS step (see Equation 2).

Bottom Line: This paper reports the intermatrix synthesis of Pd0 nanoparticles in sulfonated polyethersulfone with Cardo group membranes and their use as nanocomposite catalytic membrane reactors.The synthesized polymer and the corresponding nanocomposite were characterized by spectroscopic and microscopic techniques.The catalytic efficiency of catalytic membranes was evaluated by following the reduction of p-nitrophenol in the presence of NaBH4.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical Engineering, UPC, C/Colom, 1, 08222 Terrassa, Barcelona, Spain. Jorge.Macanas@upc.edu.

ABSTRACT
Metal nanoparticles are known as highly effective catalysts although their immobilization on solid supports is frequently required to prevent aggregation and to facilitate the catalyst application, recovery, and reuse. This paper reports the intermatrix synthesis of Pd0 nanoparticles in sulfonated polyethersulfone with Cardo group membranes and their use as nanocomposite catalytic membrane reactors. The synthesized polymer and the corresponding nanocomposite were characterized by spectroscopic and microscopic techniques. The catalytic efficiency of catalytic membranes was evaluated by following the reduction of p-nitrophenol in the presence of NaBH4.

No MeSH data available.