Heterogeneous catalysis- Operating mode of catalysts : Physical properties of solid catalysts

Physical properties of solid catalysts
Heterogeneous catalysis- Operating mode of catalysts

Authors : Michel GUISNET, Ludovic PINARD

Review date: October 23, 2020 | Lire en français

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2. Physical properties of solid catalysts

The essential physical properties of solid, generally porous catalysts used in heterogeneous catalysis reactions are, on the one hand, their speciﬁc surface and, on the other, their porosity.

2.1 Speciﬁc surface measurement

The speciﬁc surface area S_g of catalysts is determined from physisorption isotherms (often at low temperatures) of very slightly reactive gases (nitrogen, oxygen, argon, alkanes, etc.): volume V adsorbed at equilibrium as a function of adsorbate pressure P, more generally as a function of P/P₀ where P₀ is the saturating vapor pressure of the adsorbate. From these isotherms, we derive the value of V_m the adsorbed volume required to obtain a monolayer of adsorbate over the entire surface. S_g is related to V_m...

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Physical properties of solid catalysts