The preparation and characterisation of two series of fluorinated chromia aerogel materials, lightly doped with zinc (II) or magnesium (II), are described. They behave as heterogeneous catalysts for transformations of 1, 1, 2-trichlorotrifluoroethane under HF-free conditions and at moderate temperatures. Product distributions depend critically on the contact time. When the latter is very long (static conditions) the surface becomes chlorinated, notwithstanding ...
