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Para-xylene is selectively prepared by reacting toluene and a methylating agent in the presence of a phosphorus modified catalyst comprising a silica polymorph intermixed with an inorganic refractory oxide, said catalyst having an alkali content of less than about 1.3 milliequivalents per gram as av

Para-xylene is selectively prepared by reacting toluene and a methylating agent in the presence of a phosphorus modified catalyst comprising a silica polymorph intermixed with an inorganic refractory oxide, said catalyst having an alkali content of less than about 1.3 milliequivalents per gram as available alkali.

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A catalyst comprising a hydrogen activator comprising a member selected from the group consisting of chromium, copper, nickel and platinum, a crystalline silica polymorph having a pore volume of about 0.18 cc/gram, and an inorganic refractory oxide selected from the group consisting of alumina, sili

A catalyst comprising a hydrogen activator comprising a member selected from the group consisting of chromium, copper, nickel and platinum, a crystalline silica polymorph having a pore volume of about 0.18 cc/gram, and an inorganic refractory oxide selected from the group consisting of alumina, silica, magnesia, beryllia and zirconia. A catalyst comprising a microporous crystalline silica and a promoter containing a component selected from the group consisting of platinum, phosphorus, chromium, nickel, and copper. A catalyst as defined in claim 95 wherein said catalyst further comprises an inorganic refractory oxide. A catalyst as defined in claim 96 wherein said refractory oxide comprises alumina. A catalyst as defined in claim 96 wherein said refractory oxide comprises silica.