Competitive Adsorption of Nitrite and Hydrogen on Palladium during Nitrite Hydrogenation

Rolf Sybren Postma, Roger Brunet Espinosa, Leon Lefferts* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
36 Downloads (Pure)

Abstract

Nitrite hydrogenation is studied in steady-state as well as transient operation using a Pd catalyst in a tubular membrane contactor reactor. A negative reaction order in hydrogen in steady state operation proofs that hydrogen and nitrite adsorb competitively. In transient operation, feeding nitrite to the Pd surface fully covered with hydrogen results initially in very low conversion of nitrite, speeding up once hydrogen is removed from part of the Pd surface. Additional proof for competitive adsorption between hydrogen and nitrite is provided by the observation that exposure of a nitrite-covered catalyst to hydrogen induces desorption of nitrite. Formation of ammonia in these experiments proceeds via two pathways, first via a fast reaction followed by extremely slow hydrogenation of adsorbed N atoms, which is kinetically not relevant. This information is relevant for designing effective and selective catalysts when operating at very low nitrite concentration.

Original languageEnglish
Pages (from-to)3770-3776
Number of pages7
JournalChemCatChem
Volume10
Issue number17
DOIs
Publication statusPublished - 7 Sep 2018

Keywords

  • UT-Hybrid-D
  • competitive adsorption
  • hydrogenation
  • membrane reactor
  • nitrite
  • carbon nanofiber

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