The present invention provides a process for producing an alkylaromatic compound comprising the step of contacting an alkylatable aromatic compound with an alkylating agent under alkylation conditions in the presence of alkylation catalyst comprising phosphorus and a porous crystalline inorganic oxide material having an X-ray diffraction pattern including the dspacing maxima at 12.4+/-0.25, 6.9+/-0.15, 3.57+/-0.07 Angstrom.
