Process for preparing a catalyst or a trapping mass from molten salts
Process for preparing a catalyst or a trapping mass comprising the following steps: bringing a porous oxide support into contact with a metal salt comprising at least one metal belonging to groups VIB, VIIB, VIIIB, IB or IIB, of which the melting point of said metal salt is between 20° C. and 150° C., for a period of between 5 minutes and 5 hours in order to form a solid mixture, the weight ratio of said metal salt to said porous oxide support being between 0.1 and 1; heating the solid mixture with stirring at a temperature between the melting point of said metal salt and 200° C. and for 5 minutes to 12 hours; calcining the solid obtained in the preceding step at a temperature above 200° C. and below or equal to 1100° C. under an inert atmosphere or under an oxygen-containing atmosphere.
1. A process preparing a catalyst or a trapping mass, said catalyst or trapping mass consisting of a cobalt active phase and a porous silica-alumina support, said process consisting of:
a) contacting said porous silica-alumina support with at least one solid metal salt cobalt metal, of which the melting point of said metal salt is between 20° C. and 150° C., for a period of between 5 minutes and 5 hours in order to form a solid mixture, the weight ratio of said metal salt to said porous silica-alumina support being between 0.1 and 1;
b) heating the solid mixture obtained at the end of a) with stirring at a temperature of from the melting point of said metal salt to 200° C. and with a residence time of 5 minutes to 12 hours, whereby the metal salt is melted;
c) optionally, drying the solid obtained at the end of b) at a temperature below 200° C.; and
d) calcining the solid obtained at the end of b) or c) at a temperature above 200° C. and below or equal to 1100° C. under an inert atmosphere or under an oxygen-containing atmosphere.
2. The process according to claim 1 , in which the metal salt is a hydrated nitrate salt.
3. The process according to claim 2 , in which said metal salt is cobalt nitrate hexa hydrate.
4. The process according to claim 1 , in which the weight ratio of said metal salt to the porous silica-alumina support is 0.3 to 0.9.
5. The process according to claim 1 , in which a) is carried out for 10 minutes to 4 hours.
6. The process according to claim 1 , in which the calcining time of d) is less than 16 hours.
7. The process according to claim 1 , in which said porous silica-alumina support is in the form of a powder having a particle size of 10 to 500 μm.
8. The process according to claim 1 , in which said porous silica-alumina support comprises a specific surface area of 5 to 500 m 2 /g.
9. The process according to claim 1 , in which said porous silica-alumina support has a total pore volume of 0.3 to 3 ml/g.