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heterogeneous catalysts

Catalysts

Nanoparticle-based catalysis is a well-established field of research. In this application nanoparticles can play two major roles:

  1. Particles can be directly involved in reactions and act as a catalytic center, or then can modify the properties of the surrounding material (e.g. by donating or withdrawing electron density).
  2. Particles act as a supplementary material. In this case they can be used to immobilize other catalytic materials, heat the catalytic centers (e.g. via induction heating), or separate the catalyst once the reaction is complete (e.g. via magnetic separation).

Catalytic performance factors:

Nanoparticles are used in catalysis primarily due to the increased material surface area which can be achieved through breaking the material down into smaller parts. This enables more effective particle interaction with the surrounding molecules.

Catalytic performance (i.e. high activity and selectivity for the desired product) often corresponds to specific particle size, shape and architecture. This is most likely due to complex correlations between these parameters and specific electronic states, lattice strain, exposed crystallographic planes etc. of the particles that are responsible for the desired catalytic behavior.

Typically, nanoparticle suppliers provide non-uniform or polydisperse (CV values >20%) material with a range of particle sizes, shapes and architectures. The material properties (e.g. electronic states) vary in polydisperse materials and therefore their activity towards target reactions is substantially diminished. Moreover, undesired particles can catalyze side reactions, resulting in the fall of catalyst selectivity. The use of such materials in catalysis is therefore ineffective and wasteful.

Benefits of using Particle Works materials in catalysis:

Particle Works offers a range of highly monodisperse (CV values <10%) nanoparticles for applications in catalysis. These performance materials bring benefits such as:

  • High catalytic activity
  • High selectivity for target reactions
  • Experimental reproducibility

Products

Gold Nanoparticles When processing in organic solvent is required, we recommend  Dodecanethiol coated Gold nanoparticles (hexane, toluene, dichloromethane)
  When processing in aqueous solvent is required,  we recommend to use PEG functionalized  Gold nanoparticles
Quantum dots For processing in organic solvents, we recommend CdSe quantum dots in toluene
  When  processing in aqueous solvent is required, we recommend mercaptosuccinic acid functionalized CdSe quantum dots (available on request only)
Magnetic nanoparticles For magnetic separation and inductive heating applications, we recommend Oxidatively Stable Cobalt Nanoparticles