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

doi:10.1016/S1872-2067(19)63415-7

Abstract

Abstract: 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.

Key words: γ-MnOOH, Manganese vacancy, Hexanal degradation, Indoor air, Catalysis

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63415-7

https://www.cjcatal.com/EN/Y2019/V40/I10/1525

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