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甲苯催化氧化研究進展

Current progress on catalytic oxidation of toluene: a review

  • 摘要: 揮發性有機污染物(VOCs)作為空氣污染物的主要成分之一,也是形成細顆粒物和臭氧的重要前體物. VOCs來源廣泛,涉及石油化工、汽車制造、紡織等多個行業. 甲苯作為一種典型的VOCs,對人體健康造成嚴重危害;同時,其具有穩定的芳環結構、不易降解,對其治理迫在眉睫. 在眾多處理技術中,催化氧化技術可以在低溫下將其完全轉化成二氧化碳和水,該技術的核心是開發出高活性、高穩定性、抗水抗硫性強的催化劑. 因此,本文綜述了近幾年貴金屬催化劑、過渡金屬氧化物催化劑、尖晶石型復合氧化物催化劑、鈣鈦礦型復合氧化物催化劑和金屬有機骨架基催化劑等催化氧化甲苯的研究進展,并對其反應機理和動力學進行了討論,以期幫助開發用于將甲苯完全氧化或者選擇性氧化的高效催化材料.

     

    Abstract: Volatile organic compounds (VOCs) have boiling points ranging from 50 ℃ to 260 ℃ at room temperature. These compounds are emitted from complex sources, including automobile manufacturing, fine chemicals, the pharmaceutical industry, interior decoration, and the plastics industry. VOCs serve as important precursors of secondary organic aerosols and ozone. However, some VOCs discharged into the atmosphere undergo photochemical reactions, resulting in the formation of photochemical smog. This byproduct is irritating, teratogenic, and carcinogenic, causing considerable harm to human health and posing a serious threat to the environment. Among VOCs, aromatic hydrocarbons originate from a wide range of sources relevant to human life. These compounds have been a constant hot spot in the field of VOC removal due to their unique aromatic ring structure, highly toxic effects, and challenging treatment. VOC removal mainly comprises source reduction, process management, and end–to–end treatment. End–to–end treatment methods involve adsorption, photocatalytic, plasma decomposition, membrane separation, and catalytic oxidation. Catalytic oxidation can effectively convert VOCs into carbon dioxide and water at relatively low temperatures, making it one of the most effective methods for VOC treatment. Efficient catalyst development is the key point for catalytic oxidation methods. This review highlights progress in catalyst development for the catalytic oxidation of toluene, focusing on the characteristics of noble-metal catalysts, such as noble-metal species, particle size, alloying systems, and support properties. While transition-metal oxide catalysts are abundant and inexpensive, they exhibit low catalytic performance for toluene oxidation. Therefore, discussions on transition-metal oxide catalysts include synthesis or calcination temperature, atomic substitution (isovalent and heterovalent substitutions), surface modification (noble- and transition-metal doping), and in situ surface treatment (chemical etching and surface modification). Although studies on toluene degradation using spinel- and perovskite-type oxide catalysts and metal-organic framework-based catalysts are limited, a brief summary of their characteristics during catalytic oxidation of toluene is provided, focusing on the relationship between the catalyst microstructure and performance. Furthermore, the kinetic model for the catalytic oxidation of toluene was briefly evaluated, and the corresponding reaction mechanism and kinetics were analyzed. This review aims to contribute to the development of efficient catalysts for the complete or selective oxidation of toluene.

     

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