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| Performance and intrinsic kinetics of molecular sieves ZSM-5 in NO catalytic oxidation |
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Abstract The oxidation of NO catalyzed by silicon-rich molecular sieves ZSM-5 with strong hydrophobicity at ambient temperature was investigated. The experimental results showed that NO was oxidized to NO2, which adsorbed on ZSM-5 surface and desorbed after saturation. Water vapor concentration in the NOx waste gas did not have significant effect on NO oxidation using ZSM-5, as opposed to that using activated carbon. The steady-state NO conversion in saturated wet gas decreased slightly by 6% compared to that in the dry gas at 303K over ZSM-5 due to its strong hydrophobicity. The intrinsic kinetics of NO oxidation was studied in an isothermal integral fixed-bed reactor, assuming that the effects of internal and external diffusion in the ZSM-5 catalyst pellet were negligible. The X~W/FA0 values and NO partial pressure at different temperatures were measured to evaluate the reaction rates. A simplified exponential kinetic model was established. The NO oxidation kinetic equation was determined by non-linear regression, and it fitted the experimental data well.
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Received: 11 June 2009
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