Abstract
Manganese oxide octahedral molecular sieves (OMS-2) synthesized from hydrothermal (H-OMS-2), reflux (R-OMS-2), co-precipitation (C-OMS-2), and solid phase (S-OMS-2) methods were impregnated with palladium and used for CO catalytic oxidation. Preparation methods presented an obvious effect on the morphology and catalytic activity of Pd/OMS-2 catalysts for CO oxidation. The hydrothermal synthesized OMS-2 (Pd/H-OMS-2) exhibited more ordered nanorod structure and higher crystallinity than Pd/R-OMS-2, Pd/C-OMS-2, and Pd/S-OMS-2. Further surface analysis indicated that different preparation methods of synthesizing OMS-2 and the impregnation process followed have a significant effect on the chemical states of Mn and O over the final Pd/OMS-2 products. The kinetics studies showed the trend of apparent activation energy (E a) over different catalysts: Pd/H-OMS-2 (18.19 kJ/mol) < Pd/R-OMS-2 (21.56 kJ/mol) < Pd/C-OMS-2 (22.57 kJ/mol) < Pd/S-OMS-2 (29.44 kJ/mol). Over 99 % of the CO conversion was obtained at 35 °C by the optimal Pd/H-OMS-2 catalyst.
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