Abstract
Volatile organic compounds (VOCs) are toxic and considered as one of the major contributors to the formation of secondary organic aerosols, ozone, and photochemical smog, greatly affecting the human health and environment quality. In order to abate VOCs emission, catalytic oxidation is widely applied in industries and believed to be an efficient and economically feasible way for the elimination of VOCs. This review is mainly focused on summarizing the recent progress and developments in the catalytic oxidation of various VOCs over Pd supported catalysts. Despite their high catalytic performances at much lower temperatures, the wide use of Pd supported catalysts in the industry has been limited by their high cost, low thermal stability, and incomplete oxidation of VOCs. Therefore, the synergistic effect between support and Pd, the reaction conditions, the deactivation mechanism, as well as the strategy to reveal the catalytic oxidation pathway is also systematically summarized. This review aims to give a deep comprehension and guidance for the development of efficient and cost-effective Pd supported catalysts in the near future.
Highlights
It is well known that organic compounds with the boiling point below 250°C and saturated vapor pressure equivalent to the atmospheric pressure (101.325 kPa) are identified as volatile organic compounds (VOCs)
Catalysts with a single noble metal possess excellent catalytic activities based on the results reported in the documentation, alloyed NP catalysts create exceptional physicochemical properties that are distinctly different from those of their monometallic counterparts (Yu et al, 2015; Wei et al, 2020)
Facing the increasingly urgent demand for the abatement of Volatile organic compounds (VOCs), catalytic oxidation has become a promising technique for its high efficiency and economic feasibility, compared with other technologies for VOC removal
Summary
It is well known that organic compounds with the boiling point below 250°C and saturated vapor pressure equivalent to the atmospheric pressure (101.325 kPa) are identified as volatile organic compounds (VOCs). The release of VOCs originates from the nature and human activities, the anthropogenic source accounts for a large proportion for VOC emission. The anthropogenic sources were usually linked with chemical industries, gas station, food processing, petrochemical processing, production of plastics, solvent use, and many other industrial activities (Liotta, 2010; Scire and Liotta, 2012; Liao et al, 2015). Due to the high volatility at ambient conditions, the majority of VOCs can be emitted into the atmosphere and be absorbed through the human respiratory tract, skin, and digestive tract, and are harmful to the VOCs Oxidation on Pd-Based Catalysts
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