Phosphate containing support with zerovalent chromium

A method of producing a catalyst comprising

• combining an aqueous solution of an aluminum salt with a source of phosphate ions and neutralizing with a base to give a hydrogel;
• converting said hydrogel to a xerogel by one of azeotropic distillation or washing with a water miscible organic compound, activating by heating in an oxygen-containing ambient at a temperature within the range of 150.degree.-800.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.

A method of preparing a catalyst comprising

• combining an aluminum alkoxide with phosphoric acid to give a hydrogel;
• converting said hydrogel to a xerogel, activating the resulting xerogel by heating at a temperature within the range of 150.degree.-800.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.

A method of producing a catalyst comprising

• treating a silica-containing material with a phosphating agent selected from phosphate ions and vaporized phosphorus compounds so as to give 0.001 to 0.2 gram atoms of phosphorus per mole of silica;
• activating the resulting treated silica at a temperature of 150.degree.-1000.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.

A method of producing a catalyst comprising

• coprecipitating silica and aluminum phosphate to form a hydrogel;
• removing water from said hydrogel to form a xerogel, activating the resulting xerogel by heating at a temperature within the range of 150.degree.-1000.degree. C.;
• and
• thereafter incorporating a zerovalent chromium compound under anhydrous conditions.

A method of producing a catalyst comprising

• impregnating silica with aluminum phosphate by combining a source of aluminum ions and phosphate ions with a slurry of silica in a diluent;
• thereafter forming said aluminum phosphate by evaporating off the diluent, activating the thus-impregnated silica by heating at a temperature within the range of 150.degree.-1000.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.

A method of producing a catalyst comprising

• impregnating a silica xerogel with boron phosphate by adding a source of boron ions and a source of phosphate ions to a slurry of silica xerogel in a diluent;
• thereafter evaporating off the diluent, activating the thus-impregnated silica by heating at a temperature of 150.degree.-1000.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.

A method of producing a catalyst comprising

• precipitating aluminum phosphate in the presence of silica-alumina;
• activating the resulting xerogel by heating in an oxygen-containing ambient at a temperature within the range of 150.degree.-1000.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.

A method of producing a catalyst comprising

• phosphating an alumina-containing composition by treating same with a phosphating agent selected from (1) phosphate ions and (2) vaporous phosphorus compounds to give a surface composition having a 0.2:1 to 1:1 P/Al ratio;
• activating said thus phosphated alumina composition by heating in an oxygen-containing ambient at a temperature within the range of 150.degree.-800.degree. C.;
• and
• thereafter introducing a zerovalent chromium compound under anhydrous conditions.