Efficient MnOx supported on coconut shell activated carbon for catalytic oxidation of indoor formaldehyde at room temperature

Fang, Ruimei; Huang, Haibao; Ji, Jian; Miao, He; Feng, Qiuyu; Zhan, Yanhui; Leung, Dennis Y.C.

doi:10.1016/j.cej.2017.11.176

Cited by 184 publications

(68 citation statements)

References 40 publications

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“…6(c) can be attributed to the surface-adsorbed oxygen species or surface oxygen vacancies (O ads ) and surface lattice oxygen species (O latt ), respectively. 33,34 As summarized in Table 4 as Mn 3+ ) and result in the increase of O ads , and the present study is in somewhat agreement with this conclusion. 10 Because the surface O ads can be easily reduced at lower temperatures, it is helpful to the catalytic activity of a catalyst.…”

Section: Characterizationssupporting

confidence: 91%

“…The BE at 531.1–531.7 eV and 529.7–529.9 eV in Fig. (c) can be attributed to the surface‐adsorbed oxygen species or surface oxygen vacancies (O ads ) and surface lattice oxygen species (O latt ), respectively . As summarized in Table , the surface O ads /O latt values of as‐prepared catalysts followed the order Mn4Ni1 > Mn2Ni1 > Mn8Ni1 > Mn; for example, the surface O ads /O latt value of Mn was only 0.589, and these values were increased to 0.990, 1.236 and 1.219 for Mn8Ni1, Mn4Ni1 and Mn2Ni1, respectively.…”

Section: Resultsmentioning

confidence: 92%

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Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Benzene (C6H6) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn‐Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C6H6. By means of activity tests and relative physico‐chemical characterizations, the factors affecting the activity of those Mn‐Ni composite oxides were explored. RESULTS Nitrogen (N2)‐adsorption/desorption and X‐ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface‐adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnOx). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn‐Ni composite oxides. Accordingly, compared with MnOx, the Mn‐Ni catalysts showed higher activity for thermal catalytic oxidation of C6H6. Moreover, porous Mn‐Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface‐adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn‐Ni catalysts. CONCLUSIONS The Mn4Ni1 composite oxides showed a lowest T90 value of 172 °C (C6H6 concentration 200 ppm, WHSV 60 000 mL g−1 h−1) among all of the obtained Mn‐Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture. © 2019 Society of Chemical Industry

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Section: Characterizationssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 92%

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

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“…In general, abundant surface adsorbed active oxygen species favor the higher catalytic activity. The surface active oxygen species are often detected by X‐ray photoelectron spectroscopy (XPS), time‐of‐flight secondary ion mass spectrometry (ToF‐SIMS) and infrared spectrometry (IR), HCHO‐TPD and so on …”

Section: The Influence Factors On the Activity Of Formaldehyde Oxidatmentioning

confidence: 99%

“…About the role of surface hydroxyl species, however, Fang et al held that surface hydroxyl species took part in the oxidation of HCHO. In their experimental results, the MnO x /AC‐methanol) sample with more abundant surface adsorbed surface hydroxyl species showed higher catalytic activity and stability.…”

Section: The Mechanism Of Formaldehyde Oxidation Over Manganese Oxidementioning

confidence: 99%

“…Furniture and building materials are the main sources of HCHO in indoor air . Prolonged exposure to HCHO may cause many health issues, such as: irritation of eyes, nose and throat, headache, severe allergic reactions and dermatitis, and even cancer . The World Health Organization (WHO) recommends a short‐term (30‐minute) guideline of 0.1 mg/m 3 exposure limit to HCHO for avoiding sensory irritation and a long‐term exposure limit of 0.2 mg/m 3 for protecting against long‐term health effects, including cancer .…”

Section: Introductionmentioning

confidence: 99%

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Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

2019

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Thermal catalytic oxidation is a promising and effective technique for the removal of harmful formaldehyde (HCHO) in indoor air. Manganese oxide is a mostly‐investigated non‐noble metal oxide catalyst and attracts much attention due to its better catalytic performance for formaldehyde oxidation at low temperature. In this review, the effect of manganese oxide crystal structure, surface morphology and microstructure, surface active oxygen species, reducibility as well as catalytic reaction conditions (temperature, relative humidity and HCHO initial concentration) on catalytic performance, and the catalytic mechanism over manganese oxide were summarized and discussed. The challenges and prospects for future development of manganese oxide in catalytic oxidation of formaldehyde are also covered.

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Novel GaPtMnP Alloy Based Anodic Electrocatalyst with Excellent Catalytic Features for Direct Ethanol Fuel Cells

Yoon

Basumatary

Kılıç³

et al. 2022

Adv Funct Materials

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Although considerable effort has been devoted to developing bifunctional electrocatalysts with enhanced atomic utilization in ethanol fuel cells, significant progress in this field has been hindered by notable drawbacks of the electrocatalysts, such as low stability, poor activity, and inefficient repeatability for multiple startup and shutdown cycles. Considering these issues herein, a novel nanosized GaPtMnP alloy anchored on N-doped multiwall carbon nanotubes (MWCNTs) is developed. The average size of the spherical GaPtMnP alloy nanoparticles is ≈3.5 nm. The atomic structure and d-band shift of Pt in the GaPtMnP alloy are demonstrated using state-of-the-art density functional theory calculations. Cyclic voltammetry analysis revealed that GaPtMnP/N-MWCNT delivered high mass and specific activities of 9.16 A mg Pt −1 and 10.4 mA cm −2 , respectively, in 0.3 m H 2 SO 4 + 0.5 m ethanol, values that are ≈13and 8-fold higher than the corresponding values for Pt/C. In addition, it exhibits long-term stability and durability even after 3000 cycles. A single cell based on the GaPtMnP/N-MWCNT anodic electrocatalyst exhibits a peak power density of 86.64 mW cm −2 , which is approximately fourfold higher than that of Pt/C at 70 °C. Furthermore, the performance of a fuel cell comprising the GaPtMnP/N-MWCNT catalyst remained constant even after multiple startup-shutdown cycles.

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Efficient MnOx supported on coconut shell activated carbon for catalytic oxidation of indoor formaldehyde at room temperature

Cited by 184 publications

References 40 publications

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

Novel GaPtMnP Alloy Based Anodic Electrocatalyst with Excellent Catalytic Features for Direct Ethanol Fuel Cells

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