The preparation of four kinds of α-, β-, γ-, and δ-type MnO2 with distinct crystal phases and tunnel structures were achieved and applied for 1,2-dichloroethane (1,2-DCE) catalytic combustion. The redox...
In this study, series of Co/zeolites with diverse microporous
structures
were prepared and applied for N2O catalytic decomposition.
The corresponding activities followed the order Co/Beta > Co/Mordenite
> Co/ZSM-5 > Co/MCM-49 > Co/ZSM-23 > Co/ZSM-35 > Co/SSZ-13,
while
the yield of NO2 byproduct followed the order Co/ZSM-23
> Co/ZSM-35 > Co/MCM-49 > Co/Mordenite > Co/ZSM-5 >
Co/Beta > Co/SSZ-13.
Under conditions of 30 vol % N2O and GHSV = 30 000
h–1, the best performing sample (Co/beta) achieved
a remarkable N2O conversion of 99.6% at 450 °C. In
addition, the formation of NO2 byproduct was significantly
inhibited with the corresponding concentration varying from 1063 ppm
for Co/ZSM-23 to 82 ppm for Co/Beta. Physicochemical characterization
of these as-prepared catalysts was performed including XRD, BET, H2-TPR, NH3-TPD, XPS, UV-vis-DRS, and it was found
that zeolites with higher dimensionally porous apertures (3D) and
larger pore sizes (12-membered ring, 12-MR) were conducive to introducing
Co ions onto the zeolite framework through the pore channels and further
locating them on ion-exchange sites to form active centers (Co2+). Furthermore, molecular dynamics simulation demonstrated
that the higher pore dimensions and larger pore sizes are more beneficial
for the N2O diffusion inside the pores and channels of
zeolites and promote N2O decomposition.
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