Palladium nanoparticles captured onto spherical silica particles using a urea cross-linked imidazolium molecular band

Abstract

Palladium nanoparticles were captured onto spherical silica particles using a molecular band composed of imidazolium chloride and urea moieties to form raspberry-like Pd@SiO2 composites, which can be recovered and reused without any loss of catalytic activity in Suzuki-Miyaura coupling.

Palladium supported on bacterial biomass as a novel heterogeneous catalyst: A comparison of Pd/Al2O3 and bio-Pd in the hydrogenation of 2-pentyne

“…Unwanted leaching of the palladium nanoparticles from the surface of the support into solution is problematic, as it leads to particle aggregation or loss of the active metal to the product phase resulting in contamination. Leaching can be minimised by the addition of sophisticated ligands to the surface of the support but this makes the catalyst immobilisation procedure more time-consuming and expensive (Shin et al, 2007). The palladium source is generally a Pd 2+ complex, such as palladium (II) acetate.…”

Canopy Dynamics in Nanoscale Ionic Materials

“…The ability to tailor multiple components makes NIMS a particularly versatile class of nanomaterials that can be designed to meet the specific requirements of many diverse materials and device applications. Consequently, NIMS are promising candidates for thermal management materials, [12][13][14][15][16][17][18] nanocomposite materials, novel reaction solvents, [19][20] magnetic fluids, [21][22] and conductive lubricants. [6][7][8] For example, our laboratory has reported on Au-and Pt-based NIMS employed as conductive lubricants that markedly improved the durability of RF-MEMS contacts.…”

Sustainable Preparation of Supported Metal Nanoparticles and Their Applications in Catalysis

“…[106] These supported Pd metal nanoparticles were highly active, stable and reusable in Suzuki-Miyaura couplings ( Figure 19) as compared to conventionally prepared silica-supported Pd metal nanoparticles, which suffered Pd leaching after one reaction cycle. [106] These methodologies offer a better control of the growth and distribution of nanoparticles. However, some of them involve the use of an excess of additional reductant (e.g.…”

“…TEM images of Pd metal nanoparticles supported on functionalised silica: a) before (scale bar: 20 nm); b) after first reuse (scale bar: 100 nm); and c) after fifth reuse (scale bar: 20 nm) in the Suzuki reaction. [106] Reproduced with permission from the Royal Society of Chemistry. …”