Methods of preparing a catalyst

A method of preparing a catalyst comprising:

• contacting an acid-soluble titanium-containing compound with an acid to form a first mixture;
• contacting the first mixture with an alkali metal silicate to form a hydrogel which has a silica content of from about 18 wt. % to about 35 wt. % based on the total weight of the hydrogel;
• contacting the hydrogel with an alkaline solution to form an aged hydrogel;
• washing the aged hydrogel to form a washed hydrogel;
• and
• drying the washed hydrogel to produce a titanium-containing-silica support;
• wherein a chromium compound is included in the method to form a chrominated-titanium-containing silica, either through cogelation of the hydrogel in the presence of a chromium-containing compound or contacting the titanium-containing-support with a chromium-containing compound and wherein the support has a pore volume equal to or greater than about 1.4 cm3/g.

A method of preparing a catalyst comprising:

• contacting an acid-soluble titanium-containing compound with an acid to form a first mixture;
• contacting the first mixture with an alkali metal silicate to form a hydrogel which has a silica content of from about 18 wt. % to about 35 wt. % based on the total weight of the hydrogel;
• contacting the hydrogel with an alkaline solution to form an aged hydrogel;
• washing the aged hydrogel to form a washed hydrogel;
• drying the washed hydrogel to produce a titanium-containing-silica support;
• and
• impregnating the titanium-containing-support with a chromium-containing compound to form a chrominated-titanium-containing silica wherein the support has a pore volume equal to or greater than about 1.4 cm3/g.

A method of preparing a catalyst comprising:

• contacting an acid-soluble titanium-containing compound with an acid to form a first mixture;
• contacting the first mixture with an alkali metal silicate to form a hydrogel which has a silica content of from about 18 wt. % to about 35 wt. % based on the total weight of the hydrogel;
• contacting the hydrogel with an alkaline solution to form an aged hydrogel;
• washing the aged hydrogel to form a washed hydrogel;
• and
• spray drying the washed hydrogel in the presence of a chromium-containing compound to produce a chrominated-titanium-containing silica wherein the support has a pore volume equal to or greater than about 1.4 cm3/g.

A method of preparing a catalyst comprising:

• contacting an acid-soluble titanium-containing compound and a chromium-containing compound with an acid to form a first mixture;
• contacting the first mixture with an alkali metal silicate to form a hydrogel which has a silica content of from about 18 wt. % to about 35 wt. % based on the total weight of the hydrogel;
• contacting the hydrogel with an alkaline solution to form an aged hydrogel;
• washing the aged hydrogel to form a washed hydrogel;
• and
• drying the washed hydrogel to form a chrominated-titanium-containing silica wherein the support has a pore volume equal to or greater than about 1.4 cm3/g.