Production of acid hydrocarbon conversion catalysts

A process for the production of a solid acidic catalyst suitable for use in hydrocarbon conversion reactions which process consists essentially of reacting a compound of formula XF.sub.5 wherein X is a metal selected from the group consisting of arsenic, antimony, bismuth, tantalum, vanadium and niobium at a temperature in the range of -50.degree. to +140.degree.C. with an inorganic oxide derived from a silico-tungstic acid on a silica support by impregnating the silica with a solution of the acid followed by drying and then heating to drive off the water of crystallisation, said inorganic oxide having surface hydroxyl groups and an Ho value of less than -3.0.

A process for the production of a solid acidic catalyst suitable for use in hydrocarbon conversion reactions which process consists essentially of reacting a compound of formula XF.sub.5 wherein X is a metal selected from the group consisting of arsenic, antimony, bismuth, tantalum, vanadium and niobium at a temperature in the range of -50.degree. to +140.degree.C. with an inorganic oxide selected from the group consisting of silica, alumina, boria, and mixtures thereof, said inorganic oxide or mixture thereof having surface hydroxyl groups and an Ho value of less than -3.0, the inorganic oxide being partially fluorinated by reaction with a fluorinating agent before reaction with the compound of formula XF.sub.5.

A process for the production of a solid acidic catalyst suitable for use in hydrocarbon conversion reactions which process consists essentially of reacting a compound of formula XF.sub.5 wherein X is a metal selected from the group consisting of arsenic, antimony, bismuth, tantalum, vanadium and niobium at a temperature in the range of -50.degree. to +140.degree.C. with an inorganic oxide selected from the group consisting of silica, alumina, boria, and mixtures thereof, said inorganic oxide or mixture thereof having surface hydroxyl groups and an Ho value of less than -3.0, the inorganic oxide being partially sulphonated by reactions with a sulphonating agent before reaction with the compound of formula XF.sub.5.

A process for the production of a solid acidic catalyst suitable for use in hydrocarbon conversion reactions which process consists essentially of reacting a compound of formula XF.sub.5 wherein X is a metal selected from the group consisting of arsenic, antimony, bismuth, tantalum, vanadium and niobium, at a temperature in the range of -50.degree. to +140.degree.C. with alumina having surface hydroxyl groups and which is reacted with sufficient of an agent selected from the group consisting of a fluorinating agent and sulphonating agent to partially fluorinate or sulphonate the alumina and wherein the unreacted fluorinating or sulphonating agent is removed before reacting the partially fluorinated or sulphonated alumina with the compound of formula XF.sub.5 and said alumina having an Ho value of less than -3.0.