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

• Published in: Journal of alloys and compounds 2021-06, Vol.867, p.159038, Article 159038
• Main Authors: Takahashi, Yuriko, Uchida, Hiroki, Kameda, Tomohito, Kumagai, Shogo, Saito, Yuko, Mizushina, Keiichi, Itou, Ichiro, Han, Tianye, Yoshioka, Toshiaki
• Format: Article
• Language: English
• Subjects: Aluminum; Exhaust gases; Hydroxides; Magnesium; Manganese dioxide; Mg-Al layered double hydroxide; MnO2; Nitric oxide; Nitrogen dioxide; NO removal; Oxidation; Synergistic effect; Synthesis
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2021.159038

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. [Display omitted] •One-step treatment for simpler and more effective NO removal is proposed.•MnO2/Mg-Al LDH is synthesized via rehydration.•MnO2 or Mn2O3 is pillared to the host layer and CO32−–OH intercalation occurs.•MnO2/Mg-Al LDH shows the highest NO removal rates.•A synergistic effect was generated by the MnO2/Mg-Al LDH composite.