A catalytic NOx reduction system using periodic two steps: An operation in oxidizing conditions and a relatively short operation in reducing conditions

Tadao Nakatsuji (Corresponding Author), Veikko Komppa

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

Catalytic lean NO reduction system in periodic two steps, an operation in oxidizing conditions and a relatively short operation in reducing conditions, has been investigated using Rh-based catalysts that can hardly adsorb any nitrogen dioxide. The investigation was done using a pulse reaction with a pulse-injected reductant, a continuous pulse reaction in the periodic two steps, temperature-programmed reduction (TPR), temperature-programmed oxidation (TPO) and transmission electron microscope (TEM). In the pulse reaction, after hydrogen or CO was pulse-injected for a moment to achieve reducing conditions, the highly dispersed Rh catalyst could catalyze NO reduction at 200–400°C in oxidizing conditions for about 1 min. Furthermore, after the highly dispersed Rh supported on beta-zeolite was exposed to the gas composed of 3% of O2, 40 ppm of SO2 and balance He at 300 and 400°C for 24 h, NO was effectively reduced. The highly dispersed Rh supported on a beta-zeolite was reduced with hydrogen at a much lower temperature range and oxidized with oxygen at a much higher temperature range than Rh based catalysts with Rh particle size of several nm.
Original languageEnglish
Pages (from-to)209-223
JournalApplied Catalysis B: Environmental
Volume30
Issue number1-2
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

Keywords

  • NOx reduction
  • Rhodium
  • Zeolite
  • TPR
  • TPO

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