Spaced-Confined Capsule Catalysts with Tunable Micro-Environments for
Efficient CO2 Conversion
Abstract
CO2 as 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.