A process for producing phenol and acetone from cumene hydroperoxide is described in which the cumene hydroperoxide is contacted with a solid-acid catalyst comprising an inorganic, porous, crystalline material, designated as M41S, exhibiting, after calcination, an x-ray diffraction pattern with at least one peak at a d-spacing greater than about 18 Angstrom Units with a relative intensity of 100 and a benzene adsorption capacity of greater than 15 grams of benzene per 100 grams of said material at 50 torr and 25° C., wherein said material comprises sulfonate functionality.