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Korean Journal of Chemical Engineering , 2006년, pp.545 - 547  
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Thermodynamic features of the Cu-ZSM-5 catalyzed NO decomposition reaction
Thermodynamic features of the Cu-ZSM-5 catalyzed NO decomposition reaction

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  • 초록

    a Cu-ZSM-5 catalyst with a quantified amount of the active Cu2+-dimers (Cu2+-O2-Cu2+), the kineticsof the catalytic NO decomposition to N2 and O2 was derived on the basis of the proposed reaction mechanism, and2 onto the Cu ion dimer sites were evaluated. It wasrevealed that the enthalpy of the adsorption of NO (H=34.1 kcal/mol) onto a reduced Cu+-dimer, as the initiatingstep of NO decomposition catalysis, was higher than that (H=27.8 kcal/mol) onto an oxidized Cu2+-dimer, or that(H=27.4 kcal/mol) of the dissociative adsorption of O2 onto the two reduced Cu+-dimers in neighbor. The stronginhibition effect of gas phase oxygen on the kinetic rate of NO decomposition at 400-600oC could be explained bythe thermodynamic predominance of the oxidized Cu2+-dimers against the active reduced Cu+-dimers on the catalysteven at high temperature and under the low partial pressure of oxygen. It was also found that the maximum catalyticactivity at temperatures around 50oC, which was comonly observed in the Cu-ZSM-5 catalyzed NO decomposi-tion reaction, was attributed to the relatively large enthalpy of NO adsorption onto the reduced Cu+-dimers as com-pared to that of the reaction activation energy (=19.5 kcal/mol), resulting in less favored NO adsorption at the highertemperatures than 500oC.


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