Process for manufacturing a catalyst comprising aluminum oxide and boron oxide, the resulting catalyst and the use thereof in alkylation reactions

A process for manufacturing a catalyst, wherein an aluminum compound of the formula AlX.sub.y R.sub.(3-y) where X is halogen, R is a hydrocarbon radical and y is 1, 3/2, or 2, is reacted with a carrier consisting essentially of a mixture of aluminum oxide and boron oxide in proportions by weight of 1:

• 0.01 to 1:
• 1, respectively, and wherein the compound of formula AlX.sub.y R.sub.(3-y) is used in a sufficient amount to introduce 0.5-20% by weight of halogen into the catalyst.