Potassium-modulated δ-MnO2 as robust catalysts for formaldehyde oxidation at room temperature

Ji, Jian; Lu, Xiaolong; Chen, Cheng; Miao, He; Huang, Haibao

doi:10.1016/j.apcatb.2019.118210

Cited by 201 publications

(81 citation statements)

References 61 publications

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“…Similar observations were reported in the case of Na + -modified Pd/TiO2 catalyst [15] and K + -modified Ag/Co3O4 catalyst [16]. While alkali ions effectively promote HCHO oxidation when using noble metal-based catalysts, only a few studies reported noble metal-free catalysts doped with alkali ions for the oxidation of HCHO [18][19][20].…”

Section: Introductionsupporting

confidence: 77%

La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: The role of oxygen species on the catalytic mechanism

Dhainaut

Dacquin

et al. 2021

Applied Catalysis B: Environmental

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Section: Introductionsupporting

confidence: 77%

La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: The role of oxygen species on the catalytic mechanism

Dhainaut

Dacquin

et al. 2021

Applied Catalysis B: Environmental

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“…HCHO first adsorbs onto the surface of the catalyst through hydrogen bonding with the surface hydroxyl groups. Meanwhile, O 2 adsorbs onto Pt NPs and is converted into reactive O atoms (Step I) [20,72,93] . Then, the adsorbed HCHO is oxidized into formate species while consuming surface hydroxyl groups (Step II), and is converted into DOM under the attack of surface active O atoms as well (Step III).…”

Section: Resultsmentioning

confidence: 99%

“…Various technologies have been developed for formaldehyde removal, such as adsorption, [9,10] low‐temperature plasma purification, [11] microbial degradation, [12] photocatalytic oxidation, [13–15] and thermal catalytic oxidation [16–19] . Among them, thermal catalytic oxidation of HCHO into CO 2 and H 2 O is considered as most promising due to the advantages of high removal efficiency, long‐time effectiveness, energy‐saving, economic feasibility, and lack of secondary pollution [20–22] . Many types of catalysts have been investigated for the catalytic oxidative decomposition of HCHO in recent years [22–26] .…”

Section: Introductionmentioning

confidence: 99%

Efficient Decomposition of Formaldehyde on Ni−Al Hydrotalcite/AlOOH Nanocomposites Decorated with Pt Nanoparticles at Ambient Temperature

Qin

Cheng

2021

ChemNanoMat

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Nanocomposites of nickel‐aluminum hydrotalcite (Ni−Al HT) and boehmite (AlOOH) decorated with Pt nanoparticles (NPs) were synthesized and evaluated for catalytic oxidation of formaldehyde at ambient temperature. Experimental results showed that Ni−Al HT modification improved the activity of Pt/AlOOH, and the nanocomposite with Ni/Al molar ratio of 1 : 9 (Pt/Ni1Al9) exhibited remarkable and stable catalytic activity. Characterization results indicated that Pt/Ni1Al9 had a larger specific surface area, higher degree of Pt NPs dispersion, and more surface active sites compared to the nanocomposites with other Ni/Al ratios. The enhanced catalytic activity of Pt/Ni1Al9 was attributed to the generation of more surface active oxygen species from the adsorbed oxygen molecules, which was activated by the electron transfer between Ni−Al HT and Pt/AlOOH, and the suitable interaction and synergistic effect among Ni−Al HT, Pt NPs, and AlOOH. These findings indicate that the nanocomposites of Ni−Al hydrotalcite and boehmite hold significant promises for removal of indoor formaldehyde.

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“…76‐2301), [ 10 ] where the weak diffraction peak intensity is mainly attributed to the poor crystallinity because of the room temperature synthetic process. [ 11 ] High‐magnification scanning electron microscopy (SEM) image suggests that the γ‐FeOOH NAs are uniformly grown on NF with an average size of 490 nm (Figure 1b). Transmission electron microscopy (TEM) image of the product that scratched from NF further corroborates the thin‐layered structure (Figure 1c).…”

Section: Figurementioning

confidence: 99%

Kinetically Controlled, Scalable Synthesis of γ‐FeOOH Nanosheet Arrays on Nickel Foam toward Efficient Oxygen Evolution: The Key Role of In‐Situ‐Generated γ‐NiOOH

Wang

et al. 2021

Advanced Materials

136

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Layered γ‐type iron oxyhydroxide (γ‐FeOOH) is a promising material for various applications; however, its sheet‐shaped structure often suffers from instability that results in aggregation and leads to inferior performance. Herein, a kinetically controlled hydrolysis strategy is proposed for the scalable synthesis of γ‐FeOOH nanosheets arrays (NAs) with enhanced structural stability on diverse substrates at ambient conditions. The underlying mechanisms for the growth of γ‐FeOOH NAs associated with their structural evolution are systematically elucidated by alkalinity‐controlled synthesis and time‐dependent experiments. As a proof‐of‐concept application, γ‐FeOOH NAs are developed as electrocatalysts for the oxygen evolution reaction (OER), where the sample grown on nickel foam (NF) exhibits superior performance of high catalytic current density, small Tafel slope, and exceptional durability, which is among the top level of FeOOH‐based electrocatalysts. Density functional theory calculations suggest that γ‐NiOOH in situ generated from the electrooxidation of NF would induce charge accumulation on the Fe sites of γ‐FeOOH NAs, leading to enhanced OER intermediates adsorption for water splitting. This work affords a new technique to rationally design and synthesize γ‐FeOOH NAs for various applications.

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Potassium-modulated δ-MnO2 as robust catalysts for formaldehyde oxidation at room temperature

Cited by 201 publications

References 61 publications

La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: The role of oxygen species on the catalytic mechanism

La1-x(Sr, Na, K)xMnO3 perovskites for HCHO oxidation: The role of oxygen species on the catalytic mechanism

Efficient Decomposition of Formaldehyde on Ni−Al Hydrotalcite/AlOOH Nanocomposites Decorated with Pt Nanoparticles at Ambient Temperature

Kinetically Controlled, Scalable Synthesis of γ‐FeOOH Nanosheet Arrays on Nickel Foam toward Efficient Oxygen Evolution: The Key Role of In‐Situ‐Generated γ‐NiOOH

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