Structural Evolution of Highly Active Ir-Based Catalysts for the Selective Reduction of NO with Reductants in Oxidizing Conditions

Tadao Nakatsuji (Corresponding Author), Veikko Komppa

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

NOx reduction over Ir-based catalysts in the presence of excess oxygen with hydrocarbon as a reductant was investigated in the focus on observing microstructure of Ir particle supported on various carriers and structural evolution of highly active Ir-based catalysts in the NOx reduction. Characterization of Ir-based catalysts using SEM, TEM, XRD, CO chemisorption and XPS, and reaction studies on various Ir-based catalysts have proved that the formation of relatively large Ir metal particle with 40–60 nm of nanocrystal size carried on inert supports has been a prerequisite for the evolution of high activities in the NOx reduction rather than the formation of Ir metal state on the catalyst. Furthermore, in inert gas conditions in a high temperature range of 850–950°C, Ir metal was easily formed by using the support such as TiO2 and ZrO2 that drastically decreased its specific surface area in the temperature range.
Original languageEnglish
Pages (from-to)217-223
Number of pages7
JournalTopics in Catalysis
Volume16
Issue number1-4
DOIs
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

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Reducing Agents
Catalysts
Metals
Noble Gases
Carbon Monoxide
Chemisorption
Inert gases
Hydrocarbons
Specific surface area
Nanocrystals
X ray photoelectron spectroscopy
Oxygen
Transmission electron microscopy
Temperature
Microstructure
Scanning electron microscopy

Cite this

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title = "Structural Evolution of Highly Active Ir-Based Catalysts for the Selective Reduction of NO with Reductants in Oxidizing Conditions",
abstract = "NOx reduction over Ir-based catalysts in the presence of excess oxygen with hydrocarbon as a reductant was investigated in the focus on observing microstructure of Ir particle supported on various carriers and structural evolution of highly active Ir-based catalysts in the NOx reduction. Characterization of Ir-based catalysts using SEM, TEM, XRD, CO chemisorption and XPS, and reaction studies on various Ir-based catalysts have proved that the formation of relatively large Ir metal particle with 40–60 nm of nanocrystal size carried on inert supports has been a prerequisite for the evolution of high activities in the NOx reduction rather than the formation of Ir metal state on the catalyst. Furthermore, in inert gas conditions in a high temperature range of 850–950°C, Ir metal was easily formed by using the support such as TiO2 and ZrO2 that drastically decreased its specific surface area in the temperature range.",
author = "Tadao Nakatsuji and Veikko Komppa",
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language = "English",
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Structural Evolution of Highly Active Ir-Based Catalysts for the Selective Reduction of NO with Reductants in Oxidizing Conditions. / Nakatsuji, Tadao (Corresponding Author); Komppa, Veikko.

In: Topics in Catalysis, Vol. 16, No. 1-4, 2001, p. 217-223.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Structural Evolution of Highly Active Ir-Based Catalysts for the Selective Reduction of NO with Reductants in Oxidizing Conditions

AU - Nakatsuji, Tadao

AU - Komppa, Veikko

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N2 - NOx reduction over Ir-based catalysts in the presence of excess oxygen with hydrocarbon as a reductant was investigated in the focus on observing microstructure of Ir particle supported on various carriers and structural evolution of highly active Ir-based catalysts in the NOx reduction. Characterization of Ir-based catalysts using SEM, TEM, XRD, CO chemisorption and XPS, and reaction studies on various Ir-based catalysts have proved that the formation of relatively large Ir metal particle with 40–60 nm of nanocrystal size carried on inert supports has been a prerequisite for the evolution of high activities in the NOx reduction rather than the formation of Ir metal state on the catalyst. Furthermore, in inert gas conditions in a high temperature range of 850–950°C, Ir metal was easily formed by using the support such as TiO2 and ZrO2 that drastically decreased its specific surface area in the temperature range.

AB - NOx reduction over Ir-based catalysts in the presence of excess oxygen with hydrocarbon as a reductant was investigated in the focus on observing microstructure of Ir particle supported on various carriers and structural evolution of highly active Ir-based catalysts in the NOx reduction. Characterization of Ir-based catalysts using SEM, TEM, XRD, CO chemisorption and XPS, and reaction studies on various Ir-based catalysts have proved that the formation of relatively large Ir metal particle with 40–60 nm of nanocrystal size carried on inert supports has been a prerequisite for the evolution of high activities in the NOx reduction rather than the formation of Ir metal state on the catalyst. Furthermore, in inert gas conditions in a high temperature range of 850–950°C, Ir metal was easily formed by using the support such as TiO2 and ZrO2 that drastically decreased its specific surface area in the temperature range.

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