Structured catalysts for photo-Fenton oxidation of acetic acid

Sannino, Diana; Vaiano, Vincenzo; Ciambelli, Paolo; Исупова, Л. А.

doi:10.1016/j.cattod.2010.11.025

Cited by 54 publications

(30 citation statements)

References 23 publications

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“…First, it is long, because several dip-dry-calcine cycles are required to obtain the desired active phase loading. Then, low SSA (below 6 m 2 •g −1 ) of the synthesized perovskite-type materials is generally obtained [101,103,104]. In addition, the partial dissolution of the substrate in the acidic and chelating solution used for impregnation leads to the formation of less active secondary phases (e.g., spinels, partially substituted perovskites) [101,103,104].…”

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

“…The latter option allows a homogeneous drying, preventing the redistribution of the active material and therefore ensuring its good distribution on the carrier [107]. Finally, calcination at 700-1100 °C [101,102,104] converts the precursors into the desired perovskite-type oxide. Phase pure materials are generally obtained but secondary phases are sometimes detected [101].…”

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

“…After withdrawal of the impregnated carrier, the excess solution is removed by blowing pressurized air. Drying can be carried out in a conventional furnace (80-200 °C) [102][103][104], under air-flow at room temperature [101], or in a microwave oven [106]. The latter option allows a homogeneous drying, preventing the redistribution of the active material and therefore ensuring its good distribution on the carrier [107].…”

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

“…The increased viscosity and concentration of such solutions result in increased amounts of deposited material. A variation of this preparation protocol uses a polymerized solution of nitrate precursors, citric acid and ethylene glycol prepared by the Pechini method [101,[103][104][105]. After withdrawal of the impregnated carrier, the excess solution is removed by blowing pressurized air.…”

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

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Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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Automotive Three-Way Catalysts (TWC) were introduced more than 40 years ago. Despite that, the development of a sustainable TWC still remains a critical research topic owing to the increasingly stringent emission regulations together with the price and scarcity of precious metals. Among other material classes, perovskite-type oxides are known to be valuable alternatives to conventionally used TWC compositions and have demonstrated to be suitable for a wide range of automotive applications, ranging from TWC to Diesel Oxidation Catalysts (DOC), from NO x Storage Reduction catalysts (NSR) to soot combustion catalysts. The interest in these catalysts has been revitalized in the past ten years by the introduction of the concept of catalyst regenerability of perovskite-based TWC, which is in principle well applicable to other catalytic processes as well, and by the possibility to reduce the amounts of critical elements, such as precious metals without seriously lowering the catalytic performance. The aim of this review is to show that perovskite-type oxides have the potential to fulfil the requirements (high activity, stability, and possibility to be included into structured catalysts) for implementation in TWC.

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Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

Section: Precursor-derived "On-substrate-wall" Synthesis Of Catalystsmentioning

confidence: 99%

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Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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“…Photocatalytic oxidation reactions have been widely used in processes such as the decontamination of water and air [1][2][3][4][5][6][7][8]. However, applications of heterogeneous photocatalysis for the synthesis of compounds of commercial importance have been considered only in recent years.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Deactivation Phenomena Occurring in the Cyclohexane Photocatalytic Oxidative Dehydrogenation on MoOx/TiO2 through Gas Phase and in situ DRIFTS Analyses

et al. 2013

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Abstract:In this work, the results of gas phase cyclohexane photocatalytic oxidative dehydrogenation on MoO x /SO 4 /TiO 2 catalysts with DRIFTS analysis are presented. Analysis of products in the gas-phase discharge of a fixed bed photoreactor was coupled with in situ monitoring of the photocatalyst surface during irradiation with an IR probe. An interaction between cyclohexane and surface sulfates was found by DRIFTS analysis in the absence of UV irradiation, showing evidence of the formation of an organo-sulfur compound. In particular, in the absence of irradiation, sulfate species initiate a redox reaction through hydrogen abstraction of cyclohexane and formation of sulfate (IV) species. In previous studies, it was concluded that reduction of the sulfate (IV) species via hydrogen abstraction during UV irradiation may produce gas phase SO 2 and thereby loss of surface sulfur species. Gas phase analysis showed that the presence of MoO x species, at same sulfate loading, changes the selectivity of the photoreaction, promoting the formation of benzene. The amount of surface sulfate influenced benzene yield, which decreases when the sulfate coverage is lower. During irradiation, a strong deactivation was observed due to the poisoning of the surface by carbon deposits strongly adsorbed on catalyst surface.

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Liquid‐Phase Catalytic Oxidations with Perovskites and Related Mixed Oxides

Pârvulescu

2015

Perovskites and Related Mixed Oxides

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Structured catalysts for photo-Fenton oxidation of acetic acid

Cited by 54 publications

References 23 publications

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

Investigation of the Deactivation Phenomena Occurring in the Cyclohexane Photocatalytic Oxidative Dehydrogenation on MoOx/TiO2 through Gas Phase and in situ DRIFTS Analyses

Liquid‐Phase Catalytic Oxidations with Perovskites and Related Mixed Oxides

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