1. Different classes of catalysts and their physico-chemical properties

1.1 Nature of sites according to catalysts

Solid catalysts can be divided into two categories [J 1 250] :

conductors of electric current: metals and semiconductors are active in redox reactions. Their catalytic action can be linked to their role as reservoirs of electrons, which can then be exchanged with the reactants;
insulators which catalyze reactions attributable to acids or bases in homogeneous catalysis: dehydration,...

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(1) - TOPSØE (H.), CLAUSEN (B.S.), MASSOTH (F.E) - Hydrotreating Catalysis. In Catalysis : Science and Technology. - Anderson, J. R., Boudart, M., Eds. ; Catalysis-Science and Technology ; Springer : Berlin, Heidelberg (1996).
(2) - NINH (T.K.T.), MASSIN (L.), LAURENTI...

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