Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

He, Chi; Cheng, Jie; Zhang, Xin; Douthwaite, Mark; Pattisson, Samuel; Hao, Zhengping

doi:10.1021/acs.chemrev.8b00408

Cited by 1,611 publications

(749 citation statements)

References 1,175 publications

(2,714 reference statements)

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“…Propene has an extensive production and application in numerous industries, and it is a primary contributor to photochemical smog, making it unfriendly to the environment [117]. There are lots of reports focusing on the catalytic oxidation of propene.…”

Section: Selective Catalytic Oxidation Of Propenementioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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This paper mainly focuses on the application of nanostructured MoO 3 materials in both energy and environmental catalysis fields. MoO 3 has wide tunability in bandgap, a unique semiconducting structure, and multiple valence states. Due to the natural advantage, it can be used as a high-activity metal oxide catalyst, can serve as an excellent support material, and provide opportunities to replace noble metal catalysts, thus having broad application prospects in catalysis. Herein, we comprehensively summarize the crystal structure and properties of nanostructured MoO 3 and highlight the recent significant research advancements in energy and environmental catalysis. Several current challenges and perspective research directions based on nanostructured MoO 3 are also discussed.Molecules 2020, 25, 18 2 of 26 applications in energy and environmental catalysis on account of their relatively low cost, high activity, and stability [9][10][11][12].Molybdenum oxide (MoO 3 ), a kind of transition metal oxide with a n-type semiconducting, nontoxic nature and high stability, has attracted a lot of attention. In particular, nanostructured MoO 3 has demonstrated superior properties to bulk MoO 3 , which is successfully employed in rechargeable batteries [13], capacitors [14], photocatalysis [15], electrocatalysis [16], gas sensors [17], and other applications [6]. The extended tunnels between the MoO 6 octahedra in MoO 3 are suitable for insert/de-insert mobile ions, such as H + and Li + , and multiple oxidation states can enable rich redox reactions. Moreover, the superiorities of low cost, chemical stability, high theoretical specific capacity (1117 mA·h/g), and the environmentally friendly nature make nanostructured MoO 3 exceptional electrode materials for rechargeable batteries capacitors [13,18]. MoO 3 has been investigated as the photocatalyst in terms of its anisotropic layered structure for absorbing UV, as well as visible light. Introducing a defect band by H + intercalation or oxygen vacancies can create defect state and decrease MoO 3 bandgap, which effectively increase the photocatalytic activity [15]. Each oxygen atom bonds to only one molybdenum atom of MoO 6 octahedra, and oxygen vacancy generates Mo dangling bond. MoO 3 favors the adsorption of water molecules in oxygen vacancies, which act as electron acceptors and consequently reduce the energy barrier make it highly reactive for electrocatalysis [2,19]. As a good gasochromic material, MoO 3 has efficient positive-ion accommodation and good charge transfer, and it can be used as an optical-based gas sensor. Moreover, relying on the change in the conductance of the oxide-on-gas adsorption/reaction, MoO 3 has been used for NO, NO 2 , CO, H 2 , NH 3 , and other gases [17]. The unique structure strongly affects the performances. Large efforts have been made to obtain nanostructured MoO 3 with appealing properties by engineering multiple synthetic strategies for the applications in various fields. A variety of methods have been developed, including hydrothermal met...

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Section: Selective Catalytic Oxidation Of Propenementioning

confidence: 99%

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

et al. 2019

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“…From a practical standpoint, every adsorbent has its limitation as regards its capacity at break through, necessitating its regeneration in situ. To ensure that no secondary pollutants are generated during regeneration, suitable catalytic materials should be chosen, balancing high VOC storage capacity on the one hand and ease of regeneration on the other …”

Section: Concluding Remarks and Prospectsmentioning

confidence: 99%

“…To ensure that no secondary pollutants are generated during regeneration, suitable catalytic materials should be chosen, balancing high VOC storage capacity on the one hand and ease of regeneration on the other. [27,57] Accordingly, selection of the adsorbent is the most crucial aspect. Based on the above discussion, it is suggested that the ideal candidate should have high adsorption capacity as well as strong bonding with the VOC(s) so as to ensure the VOC(s) are totally oxidized during regeneration before desorption can occur.…”

Section: Concluding Remarks and Prospectsmentioning

confidence: 99%

Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Chen

et al. 2019

ChemCatChem

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Compared with other approaches for the removal of VOCs, the concept of “storage‐regeneration” cycling is proposed as an effective and promising way to eliminate low‐concentration indoor VOCs. A key issue in this approach is the design of catalytic materials which should possess balanced properties between storage and regeneration. The materials used for the storage of VOCs such as formaldehyde and benzene should not only possess high and selective VOC storage capacity, but also be easily regenerated without any release of the VOCs or generation of secondary pollutants. To this end, appropriate regeneration methods have been proposed, including thermal regeneration, plasma (nonthermal plasma) oxidation or ozone enabled regeneration. In this short review, these essential features of the cycled “storage‐regeneration” concept for VOC destruction are considered and the prospects for the implementation of this technology are assessed.

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“…The release of VOCs may lead to a serious contamination to surface/ground water, and therefore it is of great significance to separate VOCs from contaminated water [4,5]. Various techniques including condensation [6], adsorption by porous materials [7], photocatalytic degradation [8,9], catalytic oxidation [10,11], membrane separation [4,12,13], air stripping in packed columns [5] and so on have been applied for VOCs removal from air or water at laboratory or industrial scale. Recently, membrane separation has drawn a great deal of attention due to the high effectiveness of VOCs removal by membrane techniques such as pervaporation and membrane distillation [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water

Wang

Yang

et al. 2020

Membranes

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It is of great significance to separate hazardous methyl tert-butyl ether (MTBE) from water in terms of environmental protection and human health. In the present work, α-Al 2 O 3 -suppotred silica membranes were prepared by the sol-gel and dip-coating technique. Two fluorinated alkylsilanes (1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES) and trifluoropropyltriethoxysilane (TFPTES)) and two non-fluorinated alkylsilanes (octyltriethoxysilane (OTES) and propyltriethoxysilane (PTES)) were adopted to silylate the silica membrane by the post-grafting method which is used for the separation of MTBE from water by pervaporation. The results show that silylation enhances the hydrophobicity of silica membranes. The silylated silica membranes are selective towards MTBE, and the MTBE/water separation factor varies with grafting agents in the order: PFOTES > TFPTES > OTES > PTES. Membranes silylated with fluorinated carbon chains seem to be more selective towards MTBE than those with non-fluorinated carbon chains. The total flux is proportional to the pore volume of silica membranes, which depends on grafting agents in the order: PTES > PFOTES > OTES > TFPTES. Considering both total flux and selectivity, the PFOTES-SiO 2 membrane is most effective in separation, with a MTBE/water separation factor of 24.6 and a total flux of 0.35 kg m −2 h −1 under a MTBE concentration of 3.0% and a feed temperature of 30 • C.There are various reports related to the application of ceramic membranes, i.e., TiO 2 , Al 2 O 3 , ZrO 2 , zeolite and SiO 2 membranes in VOCs removal from water [15][16][17][18]23,24]. As a kind of common material, silica membrane has been used in gas separation [25,26], membrane reactor [27], and desalination [28] due to its intrinsic merits, for instance, ease of preparation, tunable pore size, relatively low cost and so on. Pristine silica membrane is generally believed to be hydrothermally unstable owing to the presence of hydrophilic surface hydroxyl groups, which tend to physically adsorb water. The attack of physically adsorbed water leads to further hydrolysis and condensation of silica species, thus resulting in structure deterioration [29]. Fortunately, the hydrothermal stability of silica membrane has been significantly enhanced by replacing hydroxyl groups with hydrophobic groups [26], so that hydrophobic silica membranes can be applied in an aqueous environment such as desalination [28]. To the best of our knowledge, only a few mesoporous silica membranes have been reported previously on the separation of VOCs from aqueous solution by pervaporation [30][31][32]. Pervaporation is considered as a separation process for liquid mixture not only by dense membranes, but also by porous membranes, especially microporous and mesoporous membranes [23,24,31,32]. Compared to conventional separation methods, pervaporation has numerous advantages; for instance, it can be utilized for the separation of azeotropes and close-boiling point mixtures [33]. Pervaporation is advantageous for the separation of VOCs from water...

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Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

Abstract: Recent advances in the catalytic oxidation of volatile organic compounds: a review based on pollutant sorts and sources. Chemical Reviews 119 (7) , pp. 4471-4568.

Cited by 1,611 publications

References 1,175 publications

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Nanostructured MoO3 for Efficient Energy and Environmental Catalysis

Catalytic Materials for Low Concentration VOCs Removal through “Storage‐Regeneration” Cycling

Mesoporous Silica Membranes Silylated by Fluorinated and Non-Fluorinated Alkylsilanes for the Separation of Methyl Tert-Butyl Ether from Water

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