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The incorporation of carbon dioxide (CO2) into industrially
useful organic products is receiving significant attention as CO2 is
abundant, inexpensive and non-toxic [1]. One of the promising
reactions in this area is the direct synthesis of dimethyl carbonate
(DMC) from CO2 and methanol [2]. DMC has increasingly attracted
interest for its benign nature and wide applications. It is used as an
alternative to the notorious phosgene in several organic transformations
[3], starting materials for polycarbonates resin, electrolyte
of lithium-ion batteries, an octane booster in gasoline and so on [4].
In recent years, a variety of catalysts for this reaction have
been investigated, such as organometallic compounds [5], metal
(IV) tetra alkoxide [6], potassium carbonate [7], zirconia-based
[8¨C10] catalysts, cerium-based [11,12] catalysts, heteropoly
compounds [13], H3PO4¨CV2O5 [14], Cu¨CNi bimetallic [15¨C18]
supported on different carriers. However, these catalysts suffer
from tedious preparation procedures or agglomeration of active
components, which might restrict their effective use and wide
application from the industrial point of view. Transition group
elements have drawn considerable attention to interact with
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