Treatment of NO by a combination of MnO2 and a CO32−-intercalated Mg–Al layered double hydroxide

Tomohito Kameda; Hiroki Uchida; Shogo Kumagai; Yuko Saito; Toshiaki Yoshioka

doi:10.1007/s42452-020-2893-y

Treatment of NO by a combination of MnO₂ and a CO₃²⁻-intercalated Mg–Al layered double hydroxide

Tomohito Kameda, Hiroki Uchida, Shogo Kumagai, Yuko Saito, Toshiaki Yoshioka

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We examined the treatment of NO from simulated exhaust gas using a combination of MnO₂ and a CO₃²⁻-intercalated Mg–Al layered double hydroxide (CO₃·Mg–Al LDH), and found that low removal efficiencies were obtained when CO₃·Mg–Al LDH was used in the absence of MnO₂. The exhaust gas was circulated in a reaction tube filled with MnO₂ (first step) and CO₃·Mg–Al LDH (second step), and the NO_x removal efficiency of ~ 70% achieved at 170 °C at the beginning of the reaction decreased to 60% after 90 min. Compared to the case of only CO₃·Mg–Al LDH, the NO_x removal efficiency significantly increased when both MnO₂ and CO₃·Mg–Al LDH were employed, which was ascribed to the oxidation of NO to NO₂ over MnO₂ followed by the subsequent removal of NO₂ by CO₃·Mg–Al LDH.

Original language	English
Article number	1075
Journal	SN Applied Sciences
Volume	2
Issue number	6
DOIs	https://doi.org/10.1007/s42452-020-2893-y
Publication status	Published - 2020 Jun

Keywords

CO-intercalated Mg–Al layered double hydroxide
Combination
MnO
NO

ASJC Scopus subject areas

Engineering(all)
Environmental Science(all)
Materials Science(all)
Physics and Astronomy(all)
Chemical Engineering(all)
Earth and Planetary Sciences(all)

Access to Document

10.1007/s42452-020-2893-y

Cite this

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title = "Treatment of NO by a combination of MnO2 and a CO32−-intercalated Mg–Al layered double hydroxide",

abstract = "We examined the treatment of NO from simulated exhaust gas using a combination of MnO2 and a CO32−-intercalated Mg–Al layered double hydroxide (CO3·Mg–Al LDH), and found that low removal efficiencies were obtained when CO3·Mg–Al LDH was used in the absence of MnO2. The exhaust gas was circulated in a reaction tube filled with MnO2 (first step) and CO3·Mg–Al LDH (second step), and the NOx removal efficiency of ~ 70% achieved at 170 °C at the beginning of the reaction decreased to 60% after 90 min. Compared to the case of only CO3·Mg–Al LDH, the NOx removal efficiency significantly increased when both MnO2 and CO3·Mg–Al LDH were employed, which was ascribed to the oxidation of NO to NO2 over MnO2 followed by the subsequent removal of NO2 by CO3·Mg–Al LDH.",

keywords = "CO-intercalated Mg–Al layered double hydroxide, Combination, MnO, NO",

author = "Tomohito Kameda and Hiroki Uchida and Shogo Kumagai and Yuko Saito and Toshiaki Yoshioka",

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AU - Kameda, Tomohito

AU - Uchida, Hiroki

AU - Kumagai, Shogo

AU - Saito, Yuko

AU - Yoshioka, Toshiaki

PY - 2020/6

Y1 - 2020/6

N2 - We examined the treatment of NO from simulated exhaust gas using a combination of MnO2 and a CO32−-intercalated Mg–Al layered double hydroxide (CO3·Mg–Al LDH), and found that low removal efficiencies were obtained when CO3·Mg–Al LDH was used in the absence of MnO2. The exhaust gas was circulated in a reaction tube filled with MnO2 (first step) and CO3·Mg–Al LDH (second step), and the NOx removal efficiency of ~ 70% achieved at 170 °C at the beginning of the reaction decreased to 60% after 90 min. Compared to the case of only CO3·Mg–Al LDH, the NOx removal efficiency significantly increased when both MnO2 and CO3·Mg–Al LDH were employed, which was ascribed to the oxidation of NO to NO2 over MnO2 followed by the subsequent removal of NO2 by CO3·Mg–Al LDH.

AB - We examined the treatment of NO from simulated exhaust gas using a combination of MnO2 and a CO32−-intercalated Mg–Al layered double hydroxide (CO3·Mg–Al LDH), and found that low removal efficiencies were obtained when CO3·Mg–Al LDH was used in the absence of MnO2. The exhaust gas was circulated in a reaction tube filled with MnO2 (first step) and CO3·Mg–Al LDH (second step), and the NOx removal efficiency of ~ 70% achieved at 170 °C at the beginning of the reaction decreased to 60% after 90 min. Compared to the case of only CO3·Mg–Al LDH, the NOx removal efficiency significantly increased when both MnO2 and CO3·Mg–Al LDH were employed, which was ascribed to the oxidation of NO to NO2 over MnO2 followed by the subsequent removal of NO2 by CO3·Mg–Al LDH.

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KW - Combination

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