Citation: Shanhong Sui, Pengyi Zhang, Huiyu Zhang, Ranran Cao. Low-temperature catalytic degradation of the odorous pollutant hexanal by γ-MnOOH: The effect of Mn vacancies[J]. Chinese Journal of Catalysis, ;2019, 40(10): 1525-1533. doi: S1872-2067(19)63415-7 shu

Low-temperature catalytic degradation of the odorous pollutant hexanal by γ-MnOOH: The effect of Mn vacancies

Shanhong Sui ^a,b, ,
Pengyi Zhang ^a,b ,
Huiyu Zhang ^a,b ,
Ranran Cao ^a,b

a State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;
b Beijing Key Laboratory for Indoor Air Quality Evaluation and Control, Beijing 100084, China

Received Date: 22 April 2019
Revised Date: 25 May 2019

Fund Project: This work was supported by National Natural Science Foundation of China (21677083) and Suzhou-Tsinghua Innovation Guiding Program (2016SZ0104).

Hexanal is a typical indoor odorant from wood-based products, which induces discomfort and irritation to human beings. The removal of hexanal has rarely been investigated. In this study, we found that the amount of Mn vacancies in γ-MnOOH significantly affects its catalytic activity toward hexanal degradation and transformation into CO₂. The as-synthesized Mn vacancy-rich γ-MnOOH exhibited high efficiency toward hexanal removal, achieving 100% degradation of 15 ppm hexanal at 85℃ and complete transformation into CO₂ at 160℃ under the gas hourly space velocity of 240 L/(g·h); its activity could be completely regenerated by in-situ heat treatment at 180℃. Moreover, it was found that the degradation of hexanal occurred in a stepwise manner, i.e., losing one CH₂ unit per step. Electron spinning resonance studies detected strong indicative signals for the presence of the superoxide anion radical (·O₂^-) on Mn-vacancy-rich γ-MnOOH, which may act as active oxygen species for the hexanal degradation. Understanding the role of Mn-vacancy and the mechanism of hexanal degradation by γ-MnOOH are essential for developing efficient oxide catalysts for volatile organic compounds besides hexanal.
- γ-MnOOH,
- Manganese vacancy,
- Hexanal degradation,
- Indoor air,
- Catalysis
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