Applied Catalysis A: General, Vol.256, No.1-2, 19-35, 2003
Acid catalysis by heteropoly acids
The achievements in the field of acid catalysis by heteropoly acids having different structures HXPW11LO40 (L = Zr-IV, Ti-IV, Th-IV) H(X)ZW(12)O(40) (Z = Si-IV, P-V, B-III, Co-III, Ge-IV), H21B3W39O132, H6P2W18O62, H6P2W21O71, H6As2W21O69 are reviewed. The data on the acidity of HPAs are generalized. The rules of homogeneous and heterogeneous acid catalysis by HPAs are discussed. (C) 2003 Published by Elsevier B.V.
Keywords:heteropoly acid;Keggin-type structure;Dawson-type structure;acidity;Hammet acidity function;acetone dimerization to mesitylene oxide;acetic acid and n-butyl alcohol esterification;L-sorbose acetonation