[Cl:1][Ti:2]([Cl:5])([Cl:4])[Cl:3].[N+]([O-])([O-])=O.[Al+3:10].[N+]([O-])([O-])=O.[N+]([O-])([O-])=O.[Cl-].[Mg+2:20].[Cl-].[P:22]([O-:26])([O-:25])([O-:24])=[O:23].[NH4+].[NH4+].[NH4+].[OH-].[NH4+]>CCCCCCC>[P:22]([O-:26])([O-:25])([O-:24])=[O:23].[Mg+2:20].[Al+3:10].[Cl:1][Ti:2]([Cl:5])([Cl:4])[Cl:3]A series of catalysts comprising TiCl4 and a particulate cogelled xerogel of aluminum-magnesium phosphate was prepared at a pH of about 6-10 by combining aqueous solutions of aluminum nitrate, magnesium chloride, monobasic ammonium phosphate and ammonium hydroxide. Generally, each catalyst was made by slurrying the gel in n-heptane, adding sufficient TiCl4 to obtain the desired weight ratio of TiCl4 to gel, i.e., a weight ratio within the range of from about 0.4:1 to about 1.4:1, refluxing the mixture for about 30 minutes and cooling to about room temperature. Supernatant liquid was decanted, the slurry was washed with n-heptane to remove unreacted TiCl4 and the solvent was removed from the catalyst by evaporation in a dry box under nitrogen or argon.
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