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Effective Nitric Oxide Reduction Over Core-Shell Cu-SSZ-13@meso-MOx Catalysts with Significant Catalytic Activity and
Yunhui Li1, Ganggang Li2, Tingting Xu1
1School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, P. R. China.
Abstract:
In this study, Cu-SSZ-13 zeolites are successfully coated with mesoporous metal oxides (CeO2 , Fe2 O3 , TiO2 and SiO2 ) and prepared as core-shell Cu-SSZ-13@meso-MOx samples with hierarchical pore structure. Compared with Cu-SSZ-13, the catalytic activity and hydrothermal stability of the Cu-SSZ-13@meso-MOx have been greatly improved. The promoting effect of meso-MOx shell on the catalytic activity of Cu-SSZ-13 is mainly attribute to the presence of both microporous and mesoporous structures, the formation of more active isolated Cu2+ ions and more L-acid sites, and the synergistic effect between Cu-SSZ-13 and meso-MOx interaction. Moreover, all the Cu-SSZ-13@meso-MOx catalysts maintain their activities to a greater extent after hydrothermal aging. The core-shell structure may play a protective role and greatly improve the hydrothermal stability of Cu-SSZ-13. More L-acidic sites and more isolated Cu2+ ions are preserved under the protection of mesoporous structure.
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