Heteropolyacids (HPAs) possess both acidic and redox catalytic
properties and held extensive
promise of practical application. These type of compound display a
great potential of specific
synthesis reactions for replacing sulfuric acid to satisfy the
requirements of environmental
protection. Heterogenizing HPAs would not only make them more
useful in liquid phase
oxidation with oxygen and in acid-catalyzed reaction, as the catalyst
is often difficult to separate
from the reaction products, but also create favorable factors for
realizing heterogenization of
homogeneous reaction and even utilizing new technology of catalytic
distillation. In this paper,
different kinds of porous materials which are well characterized,
including oxides such as Al2O3,
SiO2, TiO2, diatomite, bentonite, and active
carbon of different sources, were used as support
for heterogenizing HPAs (in different media), and the obtained results,
the intrinsic characters
of supports which may influence both the nature of the interaction
between HPAs and supports
in the heterogenization and the activity in the catalytic reaction, are
explored. It is expected
that these can provide a referential model for preparing supported acid
catalyst used in liquid
phase.
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