Advances on transition metal oxides catalysts for formaldehyde oxidation: A review

Yusuf, Abubakar; Snape, Colin E.; He, Jun; Xu, Hui; Liu, George; Zhao, Ming; Chen, George; Tang, Bencan; Wang, Chengjun; Wang, Jiawei; Behera, S. N.

doi:10.1080/01614940.2017.1342476

Cited by 107 publications

(71 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

“…investigated the formaldehyde oxidation over various metal oxides at room temperature, and found that MnO 2 exhibited the best catalytic performance. Hence, more and more attentions were focused on MnO 2 due to its additional advantages of cheap, easy to obtain, environmentally friendly and so on . In this paper, the effect of manganese oxide crystal structure, surface morphology and microstructure, surface area, surface active oxygen species, reducibility, chemical composition as well as catalytic reaction conditions on catalytic performance, and the catalytic mechanism over manganese oxide were summarized and analyzed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

2019

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

2019

View full text Add to dashboard Cite

show abstract

“…Therefore, the key to catalytic oxidation technology is to find catalysts with high efficiency and low cost. At present, the catalysts used for catalytic oxidation of HCHO include noble metal catalysts (such as Pt, Au, Pd, Ag) [6]- [15] and metal oxides (such as MnO x and Co 3 O 4 ) [16]- [23]. While among these catalysts, Pt has been widely studied for its remarkable activity.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyl Enhanced Structured Pt/Nix/a-AlOOH Catalyst for Formaldehyde Oxidation at Room Temperature

Zhao¹,

Zhang²,

Zhao³

et al. 2020

MRC

View full text Add to dashboard Cite

Ni promoted structured plate-type Pt/Ni x /a-AlOOH catalysts were developed to enhance the amount of hydroxyl group, therefore improving the catalytic activities for formaldehyde oxidation at room temperature. The analyzation results by XRD and HRTEM indicate that two kinds of materials, AlOOH and NiOOH, are detected on the surface of Pt/Ni x /a-AlOOH. It can be seen from the result of TG that the hydroxyl group on the catalyst surface increased after Ni was loaded. Furtherly, XPS results show that the percentage of hydroxyl groups which can effectively absorb formaldehyde increases from 36.4% to 72.8% by doping Ni. In addition, the content of Pt 0 increased from 27.5% to 45%. The results indicate that optimized Pt 1.15 /Ni 3.1 /a-AlOOH has the best catalytic activity with the CO 2 conversion is 88% at 25˚C and 100% at 40˚C, while CO 2 conversion over Pt 1.2 /a-AlOOH is 56% at 25˚C and 100% at 100˚C respectively. Hence, the Ni promoted plate-type Pt/a-AlOOH possesses high efficiency and it provides a new idea for catalyst design of formaldehyde oxidation.

show abstract

“…During decades of research, some transition metal oxides have been found useful for the removal of HCHO, but the best 100% removal temperature reported yet is 65°C . Their cheap and common properties make them possible alternative catalysts for the widespread decomposition of HCHO . However, the high temperature required for the complete oxidation of HCHO still restricts the application of these catalysts in the indoor environment.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous catalytic elimination of formaldehyde and ozone over one‐dimensional rod‐like manganese dioxide at ambient temperature

Zhang

Shi

Fang

et al. 2019

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BACKGROUND: Formaldehyde (HCHO) and ozone (O 3 ) are seriously hazardous materials to human health, especially in the indoor environment, and need to be inhibited. Manganese dioxide (MnO 2 ) catalysts have been extensively studied in the field of environmental pollution owing to their various morphologies and crystal structures. In this study, one-dimensional rod-like MnO 2 catalysts were prepared by a hydrothermal method. The crystal form and other factors affecting the activity were explored through an activity test and various characterization methods. The decomposition process of HCHO and O 3 on the most active catalyst was analyzed by in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS). RESULTS: -MnO 2 displayed the best catalytic performance and achieved 90% HCHO conversion, 100% carbon dioxide (CO 2 ) yield and 100% O 3 decomposition under different experimental conditions. The characterization results illustrated that the crystal phase of -MnO 2 has a suitable tunnel structure for HCHO adsorption, also leading to greater mobility of adsorbed oxygen species, abundant oxygen vacancies and active surface oxygen species, which could be the reason for the superior catalytic performance of -MnO 2 . Formate and dioxymethylene (DOM) species were identified as the dominant intermediates by in situ DRIFTS. The surface hydroxyl (OH) group was confirmed to play an essential role in the complete oxidation of carbonaceous intermediates into harmless CO 2 and water (H 2 O). CONCLUSION: -MnO 2 exhibited the best catalytic performance among the as-prepared samples and can efficiently eliminate HCHO and O 3 in the environment. Activity testAs mentioned, O 3 decomposition is the rate-determining step for promoting the catalytic oxidation of volatile organic compounds (VOCs). Previous studies 49,50 indicate a typical three-step reaction process for O 3 decomposition, as follows:

show abstract

Advances on transition metal oxides catalysts for formaldehyde oxidation: A review

Cited by 107 publications

References 77 publications

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

Progress of Catalytic Oxidation of Formaldehyde over Manganese Oxides

Hydroxyl Enhanced Structured Pt/Nix/a-AlOOH Catalyst for Formaldehyde Oxidation at Room Temperature

Simultaneous catalytic elimination of formaldehyde and ozone over one‐dimensional rod‐like manganese dioxide at ambient temperature

Contact Info

Product

Resources

About