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The positive effect of Ca on cryptomelane-type octahedral molecular sieve (K-OMS-2) catalysts for chlorobenzene combustion. | LitMetric
Herein, K-OMS-2 catalysts with different levels of Ca loading were synthesized to investigate the influence of Ca deposition on the catalytic oxidation of CB. The micromorphology, redox ability, oxygen species, and surface acidity of the prepared catalysts were analyzed via SEM, HR-TEM, H-TPR, O-TPD, Py-IR, and GC-MS. After the Ca addition, CB conversion on the catalyst was achieved at <220 °C and the polychlorinated by-product yield decreased significantly. Although CaCO formation on the catalyst surface from Ca caused a decline in number and fluidity of the surface lattice oxygen species, no significant impact on surface adsorbed oxygen species content was observed. Furthermore, CaCO reacted with dissociated chlorine species (HCl and polychlorinated products generated in situ), which inhibited chlorine poisoning of the active phase.
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