Method for producing catalysts by acid activation
View Patent ↗A process for producing catalysts by acid activation of phyllosilicates and coating with catalytically active metal ions wherein the acid activation is carried out in the presence of catalytically active metal ions. The solution which forms during acid activation together with the remaining solution which contains the excess, catalytically active cations are separated. The catalysts can be used for proton-catalyzed and Lewis acid-catalyzed reactions, especially for conversion of higher olefins with aromatic hydroxy compounds and amines, for esterification and dehydration reactions and for purification of aromatics.
1. A process for producing catalysts comprising
preparing a mixture of a phyllosilicate and an activating acid;
adding iron cations to the mixture of the phyllosilicate and the activating acid;
activating the phyllosilicate by use of the activating acid in the presence of the iron cations by boiling the mixture;
separating a solution formed during the acid activation which contains excess iron cations from the activated phyllosilicate to produce the catalysts.
2. The process of claim 1 wherein the phyllosilicates are selected from the group consisting of smectites, chlorites, illites, vermiculites of the serpentine-kaolin group and of the sepiolite-palygorskite group including montmorillonite, beidellite and nontronit.
3. The process of claim 1 wherein the acid activation is carried out in the presence of an earlier acid activation solution, which solution contains aluminum ions.
4. The process of claim 1 wherein the acid activation is carried out in the presence of an earlier acid activation solution, which solution contains aluminum and iron ions.
5. The process of claim 1 wherein the phyllosilicates after acid activation in the presence of catalytically active cations are washed, dried and calcined.
6. The process of claim 1 wherein the iron ions are added to the mixture of phyllosilicate and activating acid in the form of a solution.