Heteropolyacid salt catalyst, process for producing heteropolyacid salt catalyst and process for producing alkyl aromatic compound

摘要

The present invention provides a heteropolyacid salt catalyst for use in an alkylation reaction of an aromatic compound or a transalkylation, disproportionation or isomerization reaction of an alkyl aromatic compound, which comprises a heteropolyacid salt catalyst represented by the following formula (1): <?in-line-formulae description="In-line Formulae" end="lead"?>H4-mZmSiXl2O40 (1)<?in-line-formulae description="In-line Formulae" end="tail"?> wherein X represents W or Mo, Z represents (NH4) or an alkali metal atom, and m represents a numerical value of 0<=m<=4, and comprising a heteropolyacid salt crystal having an average particle diameter in the short axis of the crystal of less than 300 nm as a main component, wherein said heteropolyacid salt catalyst has an acid amount on the external surface of not less than 190 mumol per weight of a heteropolyacid salt.