ABSTRACT
CO2as a greenhouse gas causes a series of issues, and catalytic utilization
of CO2 to fuels is a favorable strategy. Herein, we
report the discovery in CO2 hydrogenation reaction where
C5+ yield can be evidently improved by encapsulating
ZnFe2O4 inside ZSM-5, in which the
micro-environments of core-shell components can be tuned.
For
the ZnFe2O4, the K promoter makes the
Fe-C structure more electron deficient than the Na, which contributes to
the formation of long-chain olefins. ZSM-5 with K or Ce modification
presents enhanced adsorption ability of alkene, then promoting
aromatization and isomerization reactions of alkenes. Compared with Ce,
K-ZSM-5 contributes to isomerization rather than aromatization, forming
more isoparaffins. In this work, regulating the microenvironment of
capsule catalysts provides a new idea for the design of efficient tandem
catalysts, and expands the ability of hybrid catalysts against other
catalysts, thus presenting an excellent catalytic efficiency for
CO2 upgrading.