Ammonium Hydroxide → Titanium Tetrachloride

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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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