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Research on Chemical Intermediates

, Volume 26, Issue 1, pp 55–60 | Cite as

Palladium species in Pd/H-ZSM-5 zeolite catalysts for CH4-SCR

  • E. Kikuchi
  • M. Ogura
Article

Abstract

The active state of palladium for NO reduction with methane (CH4-SCR) was investigated by comparing the catalytic activity of Pd/H-ZSM-5 with that of PdO/SiO2. High catalytic activity for CH4-SCR was given by Pd/H-ZSM-5 in the temperature range of 300–500 °C. PdO/SiO2 catalyzed the reaction between NO2 and CH4 in the absence of oxygen, which retarded the reaction by consuming CH4 in combustion. CH4 combustion occurred on either zeolite-supported or silica-supported catalyst, while NO preferentially retarded the combustion on Pd/H-ZSM-5. NO was found to be chemisorbed on the palladium sites in zeolite, while it was hardly chemisorbed on PdO/SiO2. NaCl titration showed that the palladium species in zeolite are Pd2+ cations content, on which NO is strongly chemisorbed resulting in high selectivity for CH4-SCR.

Keywords

Zeolite Palladium Selective Catalytic Reduction Total Flow Rate Zeolite Catalyst 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer 2000

Authors and Affiliations

  • E. Kikuchi
    • 1
  • M. Ogura
    • 1
  1. 1.Department of Applied ChemistryWaseda UniversityShinjuku, TokyoJapan

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