Selective catalytic reduction at quasi-perfect Pt(100) domains: A universal low-temperature pathway from nitrite to N 2

Matteo Duca*, Marta C. Figueiredo, Victor Climent, Paramaconi Rodriguez, Juan M. Feliu, Marc T M Koper, Paramaconi Rodriguez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

Abstract

The highly selective conversion of nitrite to N 2 at a quasi-perfect Pt(100) electrode in alkaline media was investigated with a particular emphasis on its structure sensitivity and its mechanism. High-quality (100) terraces are required to optimize the catalytic activity and steer the selectivity to N 2: defects of any symmetry dramatically reduce the N 2 evolution at [(100) × (110)] and [(100) × (111)] surfaces. On the other hand, nitrite reduction proves to be an additional example of the unique intrinsic ability of (100) surfaces to catalyze reactions involving bond breaking and successive bond formation. In the present case, (100) is able to reduce nitrite to NH 2,ads, which in a certain potential window combines with NO ads to give N 2 in a Langmuir-Hinshelwood reaction. Our findings are similar to those for other processes generating N 2, from bacterial anoxic ammonia oxidation ("anammox") to the high-temperature NO + NH 3 reaction at Pt(100) crystals under ultra-high-vacuum conditions, thus suggesting that the combination of these two nitrogen-containing species is a universal (low-temperature) pathway to N 2. The advantages of this pathway over other N 2-generating pathways are pointed out.

Original languageEnglish
Pages (from-to)10928-10939
Number of pages12
JournalJournal of the American Chemical Society
Volume133
Issue number28
DOIs
Publication statusPublished - 20 Jul 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

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