Method for limiting the emission of dust from catalyst grains

A process for limiting emission of dust from catalyst grains comprising the following two consecutive steps:

• a first step consisting of carrying out a heat treatment of the catalyst grains at a temperature greater than or equal to 100° C., followed by
• a second step that consists of carrying out a coating of the surface of the catalyst grains thereby forming a coated catalyst, by contacting components consisting of catalyst grains and one or more coating materials having a melting point temperature greater than or equal to 45° C., wherein said one or more coating materials are introduced in a form of a solid at a temperature below the melting point temperature,
• said second step being carried out without any supply of heat other than the heat supplied solely by the catalyst grains from the first step, at a temperature that is 1° C. to 60° C. lower than the melting point temperature of said one or more coating materials, while remaining greater than or equal to 40° C.