Relationship between methane adsorption and selective catalytic reduction of nitrogen oxide by methane on gallium and indium ion-exchanged ZSM-5

Tabata, Takeshi; Kokitsu, Mikako; Okada, Osamu

doi:10.1016/0926-3373(95)00016-x

Cited by 52 publications

(20 citation statements)

References 19 publications

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“…Gallium oxide has metastable phases such as α‐, γ‐, and δ‐Ga 2 O 3 besides thermodynamically stable β‐Ga 2 O 3 3 . Alumina also has metastable phases such as γ‐, δ‐, κ‐, χ‐, and θ‐Al 2 O 3 2 . The crystal structure of Ga 2 O 3 was somewhat similar to that of Al 2 O 3 4 .…”

Section: Introductionmentioning

confidence: 99%

“…G ALLIUM OXIDE is well known to be an effective catalyst for dehydrogenation of paraffin to olefin, 1 and Ga-containing zeolite catalysts have high activities for NO removal using a hydrocarbon as a reducing agent. 2 Gallium oxide has metastable phases such as a-, g-, and d-Ga 2 O 3 besides thermodynamically stable b-Ga 2 O 3 . 3 Alumina also has metastable phases such as g-, d-, k-, w-, and y-Al 2 O 3 .…”

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confidence: 99%

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Synthesis of γ‐Ga₂O₃–Al₂O₃ Solid Solutions by the Glycothermal Method

Takahashi

Inoue

Takeguchi

et al. 2006

Journal of the American Ceramic Society

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The reaction of mixtures of aluminum isopropoxide and gallium acetylacetonate in 1,4‐butanediol or 1,5‐pentanediol at high temperatures (glycothermal reaction) directly gave the γ‐Ga2O3–Al2O3 solid solutions, which had high catalytic activities for selective reduction of NO using methane as the reducing agent. However, the reaction with a higher Al/(Ga+Al) charged ratio yielded the glycol derivative of boehmite as a by‐product and the catalytic activity of the solid solution decreased. Therefore, synthesis of the solid solution using various glycols was examined and it was found that solid solutions with high Al contents without contamination of the glycol derivative of boehmite were obtained by using 1,6‐hexanediol as a reaction medium. The solid solution exhibited a higher NO conversion than that synthesized in other glycols.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Synthesis of γ‐Ga₂O₃–Al₂O₃ Solid Solutions by the Glycothermal Method

Takahashi

Inoue

Takeguchi

et al. 2006

Journal of the American Ceramic Society

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“…The CH 4 -SCR process has recently attracted great attention, since methane is almost present in all combustion exhausts, particularly in the gas-cogeneration systems. Several studies were reported on various types of catalysts for CH 4 -SCR and indicated that Co-ZSM-5, Ga-H-ZSM-5 and In-H-ZSM-5 exhibited high catalytic activities for NO reduction when CH 4 was used as a reductant [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Enhanced activity of an In–Fe2O3/H-ZSM-5 catalyst for NO reduction with methane

Wang

Zhang

Sun

et al. 2000

Applied Catalysis B: Environmental

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“…9 Shimizu et al reported that γ-alumina-supported gallium oxide (Ga 2 O 3 /γ-Al 2 O 3 ) catalyst prepared by the impregnation of γ-Al 2 O 3 (JRC-ALO4) with gallium nitrate showed a high activity for the SCR of NO x with methane. 3,4 Okimura et al reported that Zn-Al-Ga complex oxide (Ga/Al/Zn ) 7/7/3) prepared by coprecipitation followed by calcination at 800°C was very active for the SCR of NO x with hydrocarbons under dry conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Composition of Spinel-Type Ga₂O₃−Al₂O₃−ZnO Catalysts on Activity for the CH₄-SCR of NO and Optimization of Catalyst Composition

Takahashi

Nakatani

Iwamoto

et al. 2006

Ind. Eng. Chem. Res.

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Spinel-type Ga 2 O 3 -Al 2 O 3 -ZnO mixed oxides were prepared by the glycothermal reaction of zinc acetylacetonate hydrate, gallium acetylacetonate, and aluminum isopropoxide. With increasing Zn content, the crystallinity of the spinel structure of the glycothermal product increased, although excess Zn content resulted in the formation of zinc oxide as a byproduct. To optimize the Ga/Al/Zn ratio, the activities of catalysts prepared from various starting compositions and calcined at 700°C were tested for the methane-SCR of NO under wet conditions. For this reaction, catalysts with compositions in a narrow range exhibited high activity. An increase in crystallinity of the catalyst decreased the amount of adsorbed water on the surface of the catalyst and improved the tolerance for water present in the feed gas, which inhibited the catalytic activity for the methane-SCR of NO. The optimal ratio for the spinel-type Ga 2 O 3 -Al 2 O 3 -ZnO catalyst was Ga/Al/Zn ) 1/5/0.75. This catalyst exhibited a higher activity than γ-Ga 2 O 3 -Al 2 O 3 binary catalyst for the methane-SCR of NO under wet conditions.

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Relationship between methane adsorption and selective catalytic reduction of nitrogen oxide by methane on gallium and indium ion-exchanged ZSM-5

Cited by 52 publications

References 19 publications

Synthesis of γ‐Ga₂O₃–Al₂O₃ Solid Solutions by the Glycothermal Method

Synthesis of γ‐Ga₂O₃–Al₂O₃ Solid Solutions by the Glycothermal Method

Enhanced activity of an In–Fe2O3/H-ZSM-5 catalyst for NO reduction with methane

Effect of the Composition of Spinel-Type Ga₂O₃−Al₂O₃−ZnO Catalysts on Activity for the CH₄-SCR of NO and Optimization of Catalyst Composition

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Relationship between methane adsorption and selective catalytic reduction of nitrogen oxide by methane on gallium and indium ion-exchanged ZSM-5

Cited by 52 publications

References 19 publications

Synthesis of γ‐Ga2O3–Al2O3 Solid Solutions by the Glycothermal Method

Synthesis of γ‐Ga2O3–Al2O3 Solid Solutions by the Glycothermal Method

Enhanced activity of an In–Fe2O3/H-ZSM-5 catalyst for NO reduction with methane

Effect of the Composition of Spinel-Type Ga2O3−Al2O3−ZnO Catalysts on Activity for the CH4-SCR of NO and Optimization of Catalyst Composition

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Synthesis of γ‐Ga₂O₃–Al₂O₃ Solid Solutions by the Glycothermal Method

Synthesis of γ‐Ga₂O₃–Al₂O₃ Solid Solutions by the Glycothermal Method

Effect of the Composition of Spinel-Type Ga₂O₃−Al₂O₃−ZnO Catalysts on Activity for the CH₄-SCR of NO and Optimization of Catalyst Composition