Expertise
Catalysts Characterisation
Pore systems and blockage
Porosity can be characterised by adsorption isotherms, usually with nitrogen. Apart from closed pores and macropores (>50 nm), total pore volume and pore size distribution can be measured. The size distribution is often important to ensure efficient transport of reactants and products to and from the active surface. In some catalyst systems, smaller sizes are also used to limit unwanted reactions. Reaction byproducts and feedstock impurities can result in loss of loss of activity through pore blockage. Pore volume and size distribution can be used to detect such processes by comparing used catalysts with fresh.
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