The Mechanical Strength of MoO₃-CoO-Al₂O₃ Catalyst

Abstract

The mechanical strength of pellets of MoO₃-CoO-Al₂O₃ catalyst was measured and the results obtained are as follows:
(1) The mechanical strength of pellets depends on the MoO₃ content, CoO content and the calcination temperature.
(2) The MoO₃ content shows little influence on the mechanical strength.
(3) The CoO content up to 2% increases the strength, this being almost constant in further addition of Coo.
(4) The calcination temperature has a large effect upon the mechanical strength. The pellets, whose calcination temperature is 450°Cor 600°C, have maximum strength, unless they contain MoO3 above 20%.
The effect of the calcination temperature on the mechanical strength can be explained by the solid state reactions which occur between three oxides during calcination.