Formaldehyde oxidation at room temperature over layered MnO2

Qi, Qiuping; Zhang, Wenrui; Zhang, Yanshi; Bai, Guangming; Wang, Shiwei; Liang, Peng

doi:10.1016/j.catcom.2021.106293

Cited by 18 publications

(2 citation statements)

References 26 publications

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“…As seen from the PXRD analysis, the characteristic peaks of MnO2 with the 2θ values of 12.3, 25.1, 37, 41.7, and 65.7° were observed consistently with the (001), (002), (100), (-112), and (110) lattice planes of the layered birnessite (MnO2) structure, respectively [15,43] (Figure S4). The PXRD patterns of CaCO3, eggshell, and Ag-MnO2/Eggshell samples matched well with that simulated for calcite (Figure 1 [45,46].…”

Section: Physical Characteristicsmentioning

confidence: 61%

“…As an alternative to the supported noble metal catalysts (SNMCs), inexpensive transition metal oxides such as manganese dioxide (MnO2) have shown enhanced potential to drive the DLT oxidation reaction for FA [12,15]. MnO2 has been explored extensively as a suitable catalyst for VOC oxidation due to its various crystalline and amorphous phases, multiple oxidation states, and large oxygen storage capacity [12,16,17].…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature oxidative removal of gaseous formaldehyde by an eggshell waste supported silver-manganese dioxide bimetallic catalyst with ultralow noble metal content

Vikrant

Kim

Dong

et al. 2022

Journal of Hazardous Materials

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Section: Physical Characteristicsmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Low-temperature oxidative removal of gaseous formaldehyde by an eggshell waste supported silver-manganese dioxide bimetallic catalyst with ultralow noble metal content

Vikrant

Kim

Dong

et al. 2022

Journal of Hazardous Materials

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Harnessing Adsorption–Catalysis Synergy: Efficient Oxidative Removal of Gaseous Formaldehyde by a Manganese Dioxide/Metal–Organic Framework Nanocomposite at Room Temperature

Vikrant

Kim

et al. 2022

Adv Funct Materials

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The potential utility of a transition metal oxide/metal-organic framework (MOF) nanocomposite has been explored using manganese dioxide (MnO 2 )/ Universitetet i Oslo (UiO)-66-amine (NH 2 (prototypical zirconium (Zr) MOF)) to develop an efficient adsorption-catalysis system for the removal of formaldehyde (FA) from the air. The room-temperature FA (100 ppm) conversion (X FA (%)), when tested using five different MnO 2 (wt%) loadings in the nanocomposite, is estimated as: 1% MnO 2 (88%) > 2% MnO 2 (86%) > 4% MnO 2 (84%) > 6% MnO 2 (75%) > 20% MnO 2 (47%). The FA removal performance is lowered as the active catalytic sites are covered with the increases in the MnO 2 loading (e.g., >1 wt%). The FA and molecular oxygen species preferably adsorb (and activate) onto the Zr atoms attached to the NH 2 groups. The oxidation of FA into carbon dioxide proceeds subsequently through the formation of intermediates (e.g., dioxymethylene and formate). The MnO 2 nanoclusters act as secondary reactive adsorption sites to boost the capture, activation, and oxidation of the FA molecules at the Zr active centers. Accordingly, the MnO 2 /UiO-66-NH 2 nanocomposite is demonstrated to effectively harness the adsorption-catalysis synergy for highly efficient removal of FA relative to other well-known catalysts (e.g., platinum and metal oxide-based nanomaterials).

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Thermocatalytic Degradation of Gaseous Formaldehyde Using Transition Metal‐Based Catalysts

2023

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Formaldehyde (HCHO: FA) is one of the most abundant but hazardous gaseous pollutants. Transition metal oxide (TMO)-based thermocatalysts have gained much attention in its removal due to their excellent thermal stability and cost-effectiveness. Herein, a comprehensive review is offered to highlight the current progress in TMO-based thermocatalysts (e.g., manganese, cerium, cobalt, and their composites) in association with the strategies established for catalytic removal of FA. Efforts are hence made to describe the interactive role of key factors (e.g., exposed crystal facets, alkali metal/nitrogen modification, type of precursors, and alkali/acid treatment) governing the catalytic activity of TMO-based thermocatalysts against FA. Their performance has been evaluated further between two distinctive operation conditions (i.e., low versus high temperature) based on computational metrics such as reaction rate. Accordingly, the superiority of TMO-based composite catalysts over mono-and bi-metallic TMO catalysts is evident to reflect the abundant surface oxygen vacancies and enhanced FA adsorptivity of the former group. Finally, the present challenges and future prospects for TMO-based catalysts are discussed with respect to the catalytic oxidation of FA. This review is expected to offer valuable information to design and build high performance catalysts for the efficient degradation of volatile organic compounds.

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Formaldehyde oxidation at room temperature over layered MnO2

Cited by 18 publications

References 26 publications

Low-temperature oxidative removal of gaseous formaldehyde by an eggshell waste supported silver-manganese dioxide bimetallic catalyst with ultralow noble metal content

Low-temperature oxidative removal of gaseous formaldehyde by an eggshell waste supported silver-manganese dioxide bimetallic catalyst with ultralow noble metal content

Harnessing Adsorption–Catalysis Synergy: Efficient Oxidative Removal of Gaseous Formaldehyde by a Manganese Dioxide/Metal–Organic Framework Nanocomposite at Room Temperature

Thermocatalytic Degradation of Gaseous Formaldehyde Using Transition Metal‐Based Catalysts

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