CuO
x
/CeO2 is emerging as
an effective catalyst for CO oxidation due to its unique redox properties;
however, its activity and stability still need to be enhanced compared
with supported platinum group metals. Here, an approach is demonstrated
to increase the CO oxidation performance and resistance to hydrocarbon
inhibition through the K+ modification of the CuO
x
/CeO2 catalyst. The K+ can
improve the electron transfer at the metal–oxide interface,
shifting the redox equilibrium (Cu2+ + Ce3+ ↔
Cu+ + Ce4+) to be right to accelerate the formation
of highly active Cu+ species. The reaction activity of
the K+-modified CuO
x
/CeO2 catalyst was in the same order of magnitude as the noble
metal of Pt and Pd catalysts. In addition, the K+-modified
catalyst showed significantly improved resistance to hydrocarbon inhibition.
This work demonstrates a facile way to tune the redox properties of
binary transition metal oxides.
Monolithic catalysts have great potential to be used
in rotating
packed bed (RPB) reactors due to the advantages of easy installation
and structural stability. However, the complex operation environment
of liquid scouring and centrifugal force in the RPB reactor leads
to the loss of active material from the substrate. In this work, SiO2 coating was deposited on a nickel foam by the electrodeposition
(ED) method to improve the adhesion strength of SiO2 coating.
The adhesion properties were tested from three aspects of mechanical
stress, thermal stress, and chemical stress. Compared with the traditional
impregnation method and slurry circulation method, the ED method can
reduce the mass loss rate from higher than 45% to less than 4%. Moreover,
the formation of chemical interactions (Si–O–Ni bond),
as characterized by Raman and XPS spectroscopy, illustrated the enhanced
adhesion strength by the ED method. The ED method also improved the
catalytic performance and reusability of the monolithic catalyst installed
in the RPB reactor. This work demonstrates that chemical interactions
can be used to enhance the coating adhesion strength and provides
a new way to develop stable monolithic catalysts.
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