With
the depletion of fossil fuels, development of renewable energy
has attracted wide attention in recent years. The well-known polyoxometalates
(POMs) of H3PW12O40 (denoted as PW12) and H4SiW12O40 (denoted
as SiW12) are effective catalysts for acid-catalyzed reactions.
Nevertheless, industrial application of PW12 and SiW12 is largely restricted by the agglomeration, separation,
leaching and recycling issues. Moreover, the PW12 and SiW12 tend to deactivate strong proton sites due to the small
surface area of 10 m2·g–1. To overcome
these problems, the PW12 and SiW12 have been
fabricated onto a mesoporous polymer of PDVB-VBC (compound 1) with a large surface area via tris(2-aminoethyl)amine (TAEA), resulting
in the formation of new heterogeneous catalysts of PDVB-VBC-TAEA-PW12 (compound 3) and PDVB-VBC-TAEA-SiW12 (compound 4). Both compounds 3 and 4 possess mesoporous structures with high surface area of
121 m2·g–1 and 131 m2·g–1, respectively. And they have shown highly
efficient and selective dehydration of fructose to 5-hydroxymethylfurfural
(5-HMF) in dimethyl sulfoxide (DMSO) as well as esterification of
lauric acid (LA) to methyl laurate. Moreover, the catalysts can be
recycled for at least five times with no obvious decrease of reactivity.
Therefore, such catalysts have great potential for further application
from a chemical engineering point of view.
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