Abstract
ABSTRACT This article highlights recent advances in the development of transition metal-based catalysts for formaldehyde oxidation, particularly the enhancement of their catalytic activity for low-temperature oxidation. Various factors that enhance low-temperature activity are reviewed, such as morphology and tunnel structures, synthesis methods, specific surface area, amount and type of active surface oxygen species, oxidation state, and density of active sites are discussed. In addition, catalyst immobilization for practical air purification, reaction mechanism of formaldehyde oxidation, and the reaction parameters affecting the overall efficiency of the reaction are also reviewed.
Highlights
Formaldehyde (HCHO) is one of the main sources of hazardous indoor air pollution
This review focuses exclusively and extensively on recent developments over the past one and half decade towards enhancing the activity of transition metal catalysts for low temperature HCHO oxidation, considering their cost reduction potential, activity and stability
812 Formaldehyde is one of the most harmful indoor air pollutants as it has adverse effects on human health due to its toxicity and carcinogenicity. Techniques such as adsorption, photo-catalytic oxidation and catalytic oxidation have been used in HCHO removal
Summary
Formaldehyde (HCHO) is one of the main sources of hazardous indoor air pollution. Furniture and building materials such as composite wood, particle board, vinyl coverings and adhesives are some of the major indoor sources of HCHO emissions [1,2]. There is the need for further work to investigate other structures such as nano-sheets, nano-cubes, nano-rods and the extent to which they can influence other properties such as specific surface area, porosity and exposure of active metal sites and active oxygen species for improved low temperature HCHO 200 oxidation. Composite catalysts were shown to exhibit superior catalytic activities compared to the corresponding single materials synthesized using similar procedure This is due to synergistic or promotional influence of improved oxidation capabilities either through higher surface oxygen mobility, creation of more oxygen vacancies [48,86] or enhancing charge transport during redox cycles [87]. When higher Co molar ratios was employed, segregation between CeO2 and Co3O4 occurred, which led to weaker interaction and reduced the activity of the Au/CeO2-Co3O4 catalysts
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