Abstract:
Supported catalysts comprising noble metals, which can be obtained by a) applying colloidal noble metal in the form of a colloidal solution onto a carrier material, optionally mixed with additives acting as promoters, b1) drying the obtained product at 150 to 350°C, or b2) drying the obtained product at 150 to 350°C and subsequently calcining it at 350 to 550°C, for epoxidation or oxidative dehydrogenation. The invention further relates to a method for the production thereof, to the use thereof, and to the use of colloidal noble metals for producing supported catalysts.
Abstract:
Supported noble metal-comprising catalysts which can be obtained by a1) application of a noble metal compound, optionally in admixture with additives acting as promoters, to a support material, then drying, and a2) application of a reducing agent to a support material, then drying, wherein steps a1) and a2) are repeated simultaneously or in alternating turns, or wherein either of the compounds is applied entirely and then the other one is applied entirely, b) optionally afterwards drying of the resulting product, and c) subsequent calcination, its use, especially for oxidative dehydrogenation and a process for producing it.
Abstract:
The invention relates to a method for producing a catalyst comprising 0.05 - 0.25 wt % of noble metal, preferably for the oxidative dehydration of olefinically unsaturated alcohols, comprising the following steps: a) generating a direct current plasma, b) introducing metal and carrier material into the plasma, c) vaporizing metal and carrier material in the plasma or "blasting" the solid body of metal and carrier material in the plasma, and reacting the particles, d) cooling, wherein very small particles of composite material are obtained, and e) applying the composite material to the actual catalyst carrier. The invention further relates to a correspondingly produced catalyst, and to the use thereof.