Synthesis of MnO2/Mg-Al layered double hydroxide and evaluation of its NO-removal performance

Yuriko Takahashi, Hiroki Uchida, Tomohito Kameda, Shogo Kumagai, Yuko Saito, Keiichi Mizushina, Ichiro Itou, Tianye Han, Toshiaki Yoshioka

研究成果: Article査読

10 被引用数 (Scopus)


The removal of toxic nitric oxide (NO) from exhaust gas is challenging and expensive. MnO2/Mg-Al LDH, a composite of manganese dioxide and Mg-Al layered double hydroxide, was synthesized via the rehydration method for potential application in NO removal. MnO2/Mg-Al LDH was found to be complexed with MnO2, pillared between the LDH layers and intercalated with CO32− and OH. We investigated the performance of a MnO2/Mg-Al LDH treatment in removing NO from exhaust gas. The exhaust gas was circulated in a reaction tube filled with MnO2/Mg-Al LDH, CO3・Mg-Al LDH, or a MnO2 + CO3・Mg-Al LDH mixture, and the NO removal efficiency of the MnO2/Mg-Al LDH composite was compared with that of the other compounds. When NO gas (150 ppm, linear velocity 1.0 m/min) was distributed at 170 °C, treatment with the MnO2・Mg-Al LDH composite and CO3・Mg-Al LDH yielded removal rates of 83.9% and 0%, respectively. The significantly higher NO removal rate of MnO2/Mg-Al LDH was ascribed to the transformation of NO to NO2 via oxidation over MnO2. Further, the NO removal rate after 90 min through the application of a simple mixture of MnO2 and CO3・Mg-Al LDH (Mn: 4.2 wt%) was only 1.4%, suggesting that a synergistic effect was generated by the MnO2/Mg-Al LDH composite. Though NO removal by MnO2/Mg-Al LDH was reduced at temperatures of 140 °C and higher, the results suggest that the synthesized compound can be much more effective than those commonly used for NO removal from exhaust gas.

ジャーナルJournal of Alloys and Compounds
出版ステータスPublished - 2021 6月 25

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学


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