Synthesis of supported metal nanoparticle catalysts using ligand assisted methods

Abstract

2012Synthesis of supported metal nanoparticle catalysts using ligand assisted methods NANOSCALE, CAMBRIDGE, v. 4, n. 19, pp. 5826-5834, FEB, 2012 The synthesis and characterization methods of metal nanoparticles (NPs) have advanced greatly in the last few decades, allowing an increasing understanding of structure-property-performance relationships. However, the role played by the ligands used as stabilizers for metal NPs synthesis or for NPs immobilization on solid supports has been underestimated. Here, we highlight some recent progress in the preparation of supported metal NPs with the assistance of ligands in solution or grafted on solid supports, a modified deposition-reduction method, with special attention to the effects on NPs size, metal-support interactions and, more importantly, catalytic activities. After presenting the general strategies in metal NP synthesis assisted by ligands grafted on solid supports, we highlight some recent progress in the deposition of pre-formed colloidal NPs on functionalized solids. Another important aspect that will be reviewed is related to the separation and recovery of NPs. Finally, we will outline our personal understanding and perspectives on the use of supported metal NPs prepared through ligandassisted methods.

Polymer versus phosphine stabilized Rh nanoparticles as components of supported catalysts: implication in the hydrogenation of cyclohexene model molecule

“…In addition, ligand-stabilized nanoparticles can be investigated in catalysis both in solution and in supported reaction conditions. 12 The challenge is to find ligands able to stabilize well-defined nanoparticles while controlling accessibility at the metal surface and orientating their reactivity. 13 The study of the influence of ligands on catalytic activity has been less studied than the facet dependency but nice results illustrate well this important point.…”

Introduction of Ag/CuO/MCM‐48 as an efficient catalyst for the one‐pot synthesis of novel pyran‐pyrrole hybrids

“…Nevertheless, direct use of metallic nanoparticles suffers from some demerits in catalyst activity, stability and separation due to their aggregative nature. Immobilization of the metals on the support is a pivotal way to overcome these mentioned problems …”

“…Immobilization of the metals on the support is a pivotal way to overcome these mentioned problems. [47][48][49][50][51][52] Cu-based catalysts have been given extensive attention due to its abundance, inexpensiveness and variety of oxidation states. [37] Cu-based bimetallic catalysts demonstrated superior performance compared with Cu-based monometallic catalysts.…”

Stabilization of Palladium Catalysts for the Heck Reaction by Support Functionalization and Solvent Selection

“…[9] The synthesis of nanoparticles by ligand-assisted methods has been used as an alternative to produce heterogeneous catalysts for liquid-phase reactions. [10] In this methodology, materials such as silica and polymers are modified with N-, S-, and Pcontaining groups that are able to anchor metal complexes or nanoparticles. [11] Moreover, the substitution of silanol by other functional groups facilitates the adsorption of metal precursors and the control of the particle size.…”