Polydimethylsiloxane Sponge-Supported Metal Nanoparticles as Reusable Catalyst for Continuous Flow Reactions

Abstract

In this manuscript, polydimethylsiloxane (PDMS) sponges supporting metal nanoparticles (gold and palladium) were developed and their catalytic properties were studied through a model reaction such as the hydrogenation of p-nitrophenol. Different synthetic conditions for gold and palladium were studied to obtain the best catalyst in terms of nanoparticle loading. The as-prepared catalysts were characterized by different techniques such as scanning electron microscopy (SEM) and inductively coupled plasma optical emission spectroscopy (ICP-OES). The catalytic efficiency and recyclability of the supported catalyst were tested in static conditions. In addition, thanks to the porous structure of the material where the catalytic centers (metal nanoparticles) are located, the model reaction for continuous flow systems was tested, passing the reaction components through the catalyst, observing a high efficiency and recyclability for these systems.

Bimetal–Organic Frameworks for High Efficiency Catalytic Reduction

“…As seen in Figure g, it shows good linear correlations of ln( c t / c 0 ) versus t for the reduction reaction. The k app (slope of the linearly fitted plots) is 0.153 s –1 ; the catalytic activity of the CuNi-MOFs (Figure f,g) is 34 times higher than that of Ni-MOFs (0.0045 s –1 , Figure d,e) as well as some novel metals in previous reports − (Table S2). It is worth noting that a higher k app indicates higher catalytic activity in the catalytic reduction of 4-NP by NaBH 4 .…”

Nanomaterials and Nanostructures Hand-In-Hand with Biology

“…Therefore, the use of easily synthesizable, recoverable catalysts with a high recyclability capacity is important. A significant topic in catalysis is the transformation of toxic molecules into others that are less harmful to biological media [ 13 ]. Thus, the authors have carried out the “in situ” synthesis of palladium and gold nanoparticles on porous polydimethylsiloxane substrates.…”