A NOx reduction system using ammonia-storage selective catalytic reduction in rich/lean excursions

Tadao Nakatsuji (Corresponding Author), Manabu Matsubara, Juhana Ruotoistenmäki, Naohiro Sato, Hiroshi Ohno

Research output: Contribution to journalArticleScientificpeer-review

35 Citations (Scopus)

Abstract

NOx reduction in a different reaction mechanism from the NOx storage reduction was investigated.
NOx is found to be reduced over a specified catalyst in the following steps: in lean conditions, NO is partially oxidized into NO2, followed by NO and NO2 adsorption, in rich conditions, the adsorbed NOx is reduced mainly into ammonia, followed by ammonia adsorption and finally, during the subsequent cycle of the lean conditions, the adsorbed ammonia selectively reacts with gaseous NOx.
In this reaction, nitrogen is mainly not formed in the rich operation, but in the lean operation.
On the other hand, nitrogen is formed only in the rich operation over the NOx storage-reduction catalyst.
The newly developed catalyst is composed of a noble metal/an oxygen storage capacity (OSC) material and a solid acid.
Original languageEnglish
Pages (from-to)190-201
JournalApplied Catalysis B: Environmental
Volume77
Issue number1-2
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Fingerprint

Selective catalytic reduction
Ammonia
ammonia
catalyst
Catalysts
Nitrogen
adsorption
Adsorption
nitrogen
Precious metals
Oxygen
oxygen
Acids
acid
metal

Keywords

  • NOx reduction
  • ammonia storage
  • ammonia
  • NH3-SCR
  • adsorption
  • solid acid
  • rich/lean operations

Cite this

Nakatsuji, Tadao ; Matsubara, Manabu ; Ruotoistenmäki, Juhana ; Sato, Naohiro ; Ohno, Hiroshi. / A NOx reduction system using ammonia-storage selective catalytic reduction in rich/lean excursions. In: Applied Catalysis B: Environmental. 2007 ; Vol. 77, No. 1-2. pp. 190-201.
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abstract = "NOx reduction in a different reaction mechanism from the NOx storage reduction was investigated. NOx is found to be reduced over a specified catalyst in the following steps: in lean conditions, NO is partially oxidized into NO2, followed by NO and NO2 adsorption, in rich conditions, the adsorbed NOx is reduced mainly into ammonia, followed by ammonia adsorption and finally, during the subsequent cycle of the lean conditions, the adsorbed ammonia selectively reacts with gaseous NOx. In this reaction, nitrogen is mainly not formed in the rich operation, but in the lean operation. On the other hand, nitrogen is formed only in the rich operation over the NOx storage-reduction catalyst. The newly developed catalyst is composed of a noble metal/an oxygen storage capacity (OSC) material and a solid acid.",
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author = "Tadao Nakatsuji and Manabu Matsubara and Juhana Ruotoistenm{\"a}ki and Naohiro Sato and Hiroshi Ohno",
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A NOx reduction system using ammonia-storage selective catalytic reduction in rich/lean excursions. / Nakatsuji, Tadao (Corresponding Author); Matsubara, Manabu; Ruotoistenmäki, Juhana; Sato, Naohiro; Ohno, Hiroshi.

In: Applied Catalysis B: Environmental, Vol. 77, No. 1-2, 2007, p. 190-201.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A NOx reduction system using ammonia-storage selective catalytic reduction in rich/lean excursions

AU - Nakatsuji, Tadao

AU - Matsubara, Manabu

AU - Ruotoistenmäki, Juhana

AU - Sato, Naohiro

AU - Ohno, Hiroshi

PY - 2007

Y1 - 2007

N2 - NOx reduction in a different reaction mechanism from the NOx storage reduction was investigated. NOx is found to be reduced over a specified catalyst in the following steps: in lean conditions, NO is partially oxidized into NO2, followed by NO and NO2 adsorption, in rich conditions, the adsorbed NOx is reduced mainly into ammonia, followed by ammonia adsorption and finally, during the subsequent cycle of the lean conditions, the adsorbed ammonia selectively reacts with gaseous NOx. In this reaction, nitrogen is mainly not formed in the rich operation, but in the lean operation. On the other hand, nitrogen is formed only in the rich operation over the NOx storage-reduction catalyst. The newly developed catalyst is composed of a noble metal/an oxygen storage capacity (OSC) material and a solid acid.

AB - NOx reduction in a different reaction mechanism from the NOx storage reduction was investigated. NOx is found to be reduced over a specified catalyst in the following steps: in lean conditions, NO is partially oxidized into NO2, followed by NO and NO2 adsorption, in rich conditions, the adsorbed NOx is reduced mainly into ammonia, followed by ammonia adsorption and finally, during the subsequent cycle of the lean conditions, the adsorbed ammonia selectively reacts with gaseous NOx. In this reaction, nitrogen is mainly not formed in the rich operation, but in the lean operation. On the other hand, nitrogen is formed only in the rich operation over the NOx storage-reduction catalyst. The newly developed catalyst is composed of a noble metal/an oxygen storage capacity (OSC) material and a solid acid.

KW - NOx reduction

KW - ammonia storage

KW - ammonia

KW - NH3-SCR

KW - adsorption

KW - solid acid

KW - rich/lean operations

U2 - 10.1016/j.apcatb.2007.07.018

DO - 10.1016/j.apcatb.2007.07.018

M3 - Article

VL - 77

SP - 190

EP - 201

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

SN - 0926-3373

IS - 1-2

ER -