The formation and reactions of hydrogen cyanide under the conditions of the selective catalytic reduction of NO by isobutane on Cu-MFI

I. O Y Liu*, N. W. Cant

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Cyanide species played a role in the selective reduction of NO by isobutane over Cu-MFI. Cyanogen was a significant product under partial conversion conditions and the deposits that accumulated during deactivation liberated HCN when heated in the absence of oxidant. HCN was oxidized much more readily by NO/O2 mixtures than by O2 alone. Cyanogen could be a significant product of both reactions, being produced during the course of continual deactivation with HCN/O2 at < 300°C and in high yields under steady-state conditions at 200°C with HCN/NO/O2. Completion conversion to N2 and CO2 occurred during the latter reaction at 270°C. The much higher reactivity of HCN in the presence of NO was ascribed to oxidation of NO to NO2, which maintained activity through catalyst reoxidation and/or removal of adsorbed cyanide and ammonia. Deactivation during isobutane-SCR at similar temperatures might be carried out because NO2 concentrations were kept low via back conversion to NO as a consequence of reaction with carbonaceous deposits.

Original languageEnglish
Pages (from-to)352-359
Number of pages8
JournalJournal of Catalysis
Volume195
Issue number2
DOIs
Publication statusPublished - 25 Oct 2000

Keywords

  • Cu-MFI
  • Cyanogen
  • Hydrocarbon-SCR
  • Hydrogen cyanide
  • NO + isobutane

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