The hybrid catalyst through coupling metal oxides and
zeolite is
a strategy for converting CO2 to the targeted hydrocarbons
containing aromatics. Herein, we framed an active hybrid catalyst
comprising ZnCr oxide and HZSM-5 zeolite for conversion of CO2 to aromatics. The usage of dispersants (PEG or TPABr) in
the process of preparing ZnCr oxide is certainly effective to improve
the yield of aromatics. Over the hybrid catalyst ZnCr-TPABr + HZSM-5
with TPABr as a dispersant, the total hydrocarbon (HCt)
selectivity increases to 37.4% at 330 °C, obviously higher than
that over the hybrid catalyst ZnCr-none + HZSM-5 without a dispersant
(29.5%), wherein C5+ hydrocarbons in the HCt account for above 69%. Moreover, the proportion of aromatics in
C5+ products is improved to 87.9 from 79.4%. Multitechnique
characterizations demonstrate that the usage of the TPABr dispersant
induces smaller crystal sizes, the formation of more nonstoichiometric
ZnCr
x
O
y
spinels
and oxygen vacancies, and the accumulation of ZnO on the surface of
the ZnCr-TPABr oxide, which are in favor of the adsorption of CO2 and the formation of the intermediate methanol or its precursor,
methoxyl, finally leading to the improved catalytic performance.
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