THE USE OF IR, NEAR IR, VISABLE AND UV RADIATION FOR THE PREPARATION OF CATALYSTS

摘要

The preparation of activated hollow bodies (e.g., spheres) with an organic (e.g., polyvinyl alcohol) and optionally inorganic binder (e.g., Ni or Co powders) containing suspension of the desired Raney-type alloy comprised of a catalytic metal, a caustic leachable metal and optionally one or more promoters. The catalytic metal can be from groups VIII and Ib and mixtures thereof optionally promoted with metals from groups Ia, IIa, IIIb, IVb, Vb, VIb, VIIb, VIII, Ib, IIb, IIIa and IVa with one or more caustic leachable materials such as Zn, Al and Si. The alloy suspension is initially sprayed onto a fluidized bed of evaporable carrier (e.g., styrofoam). This spraying can be performed in 1 or more steps depending on the need to either produce a thicker shell or to produce a catalyst with a designed layering of different alloys and/or metals. After impregnation, the coated evaporable carrier (e.g., styrofoam) is optionally dried and then calcined in equipment capable of treating the material with infrared, near infrared, visable, microwave and ultraviolet radiation. The hollow bodies of alloy are then activated in a caustic solution.