Catalyst Characteristics

Catalyst performance can be altered significantly by the perfect choice of support material, metal location and dispersion within the pore structure of support
Type-A : Metal located on exterior surface
Type-B : Metal located deeper within the pore structure.
Type-C : Metal located extreme centre in the support structure.
Type-D : Metal evenly dispersed through out the support structure.

Selection :
Type - A : Chosen for high activity at low pressure.
Type - B & C : Chosen for higher activity at high pressure.
Type - D : Chosen for higher pressure to overcome pore diffusion limitations and to get better selectivities.
If a catalyst poision is present this can be overcome by locating the metal deeper into the support structure and have increasing the metal dispersion rate. Such a catalyst will show greater poision resistance because:
a) The poision molecule often have high molecular weight and unlike the smaller reactants are unable to penetrate the pores where the catalytic metal is located.
b) The increased metal area counteracts the constant area of metal rendered inactive by the poision.

1. Activity - High activity reduces reaction time and increases throughput.
2. Selectivity - High selectivity results in fewer byproducts,reducing costs for product purification and by-product disposal.
3. Filterability - Good filterability allows fast separation of the catalyst from the reaction mixture and increases throughput.
4. Recyclability - Multiple use of a catalyst reduces production costs.
5. PGM recovery - Good precious metal recovery reduces costs also.

a) A safe and easy start for reactions in batch or semibatch processes.
b) Low losses of precious metals.
c) Excellent filtration properties.
d) Optimal cost efficiency.
e) Simple PGM recovery & high recovery rates
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