Advances in Catalytic Oxidation of Volatile Organic Compounds over Pd-Supported Catalysts: Recent Trends and Challenges

Abstract

Volatile organic compounds (VOCs) are poisonous and regarded as the paramount source for the formation of secondary organic aerosols, ozone, and photochemical smog, greatly affecting human health and environment quality. In order to abate VOC emission, catalytic oxidation is widely applied in industries and is believed to be an efficient and economically feasible way for the elimination of VOCs. This review is primarily concentrated 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. Hence, the intrinsic properties of the active sites and supports, the reaction conditions, the deactivation mechanism, and the strategy to reveal the catalytic oxidation pathway are 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.

Noble-metal-free hydroxyapatite activated by facile mechanochemical treatment towards highly-efficient catalytic oxidation of volatile organic compound

“…Among the above all, thermal catalytic oxidation via noble-metal (as platinum, palladium, gold, silver, etc.) nanoparticle supported on porous ceramic carrier has been numerously reported 8 – 12 . However, regards to the high-cost, critical requirement on nanoparticle size and dispersibility controlling, development of alternative and novel noble-metal-free catalyst is urgently desired.…”

Coke Deposition and Structural Changes of Pellet V2O5/NaY-SiO2 in Air Regeneration: The Effects of Temperature on Regeneration

“…A rather high temperature is needed to burn this hard coke, which causes zeolite destruction [15,16]. Adding active sites, such as noble metal or transition-metal oxides, to zeolite significantly decreases the activation barrier of oxidation reaction and thus minimizes coke formation [17][18][19][20]. This kind of catalytic adsorbent can be used in the integrated process.…”

HAp/TiO2 heterojunction catalyst towards low-temperature thermal oxidation of VOC

“…VOC catalytic oxidation using non-noble metals (Pt, Pd, Au, Ag, etc) has been extensively investigated owing to their excellent performance. However, in addition to cost issues and ease of poisoning [7], precise controlling in morphology, particle size, and dispersibility of metal nanoparticle catalysts on support materials such as Al 2 O 3 , SiO 2 and zeolite are necessary to maximize catalytic activity [8][9][10]. Moreover, small and medium-scale facilities for VOC treatment suffer from high running costs and difficulty recycling, usually utilizing a catalytic combustion method with precious metal nanoparticles.…”