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Solids of the MCM-41 type (BET specific surface area around 600m 2 /g), with only Si and with Si/Al (atomic ratio)=25, were synthesized and employed as supports of dodecatungstophosphoric acid (HPW)-based catalysts. Catalysts were prepared by impregnation of HPW, in amounts of 20, 40 and 60wt%. Characterization by DTA, TGA, XRD, FT-IR and NH 3 -TPD suggest an interaction of HPW with...