Application of a catalytic membrane reactor to catalytic wet air oxidation of formic acid

Vospernik, Matevž; Pintar, Albin; Levec, Janez

doi:10.1016/j.cep.2005.10.007

Cited by 18 publications

(8 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…they work under a wide range of temperatures and pressures, they are pH resistant in the entire range, the oxidant can be efficiently dosed and uniformly delivered to the active catalyst sites. These features of the CMRs contribute to improve the contact between the contaminated water and the chemical oxidant and at the same time the catalyst deactivation can be avoided; if desired, complete mineralization of the organic pollutants can be achieved [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous catalytic oxidation of phenol by in situ generated hydrogen peroxide applying novel catalytic membrane reactors

Osegueda

Dafinov

Llorca

et al. 2015

Chemical Engineering Journal

View full text Add to dashboard Cite

This work presents a novel method for oxidation of organic matter in water solutions based on catalytic membrane reactors. The oxidant, hydrogen peroxide, is generated directly in the bulk of the liquid investigated. Commercial symmetric alumina hollow fibers have been used as a starting material thereafter introducing the active phases. It has been proven that two different catalysts are necessary in order to complete the overall reaction, as well as to generate hydrogen peroxide and a heterogeneous Fenton process. Palladium has been used for the hydrogen peroxide generation and a second active phase, transitional metal oxides or homogeneous Fe2+, has been used for the hydroxyl radical generation. An additional method for specific Pd loading to the reaction zone based on sputtering technique has been developed. All prepared catalytic membrane reactors (CMRs) are capable of generating hydrogen peroxide in amounts comparable to CMRs reported in the literature. The catalytic membrane reactors prepared by Pd impregnation show very high activity and stability in phenol oxidation reaching 40% of the generated H2O2 usage in the oxidation reaction. Despite the very high activity of the catalytic membrane reactors obtained by Pd sputtering in H2O2 production they suffer very fast deactivation. Specific reactivation including a calcination step has been found to be appropriate for the recovery of their activity. Additional experiments give new insights for better understanding of Pd deactivation especially when the metal particles are of nanometer sizes. (C) 2014 Elsevier B.V. All rights reserved.Postprint (published version

show abstract

Section: Introductionmentioning

confidence: 99%

Heterogeneous catalytic oxidation of phenol by in situ generated hydrogen peroxide applying novel catalytic membrane reactors

Osegueda

Dafinov

Llorca

et al. 2015

Chemical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…A variety of procedures were implied to improve the performance of the CMRs for the direct synthesis of hydrogen peroxide − ,− culminating with the work of Osegueda et al who used a commercial hollow fiber impregnated with palladium. , This CMR was used for the production of H 2 O 2 in contaminated wastewater effluents, and it was observed that the hydrogen peroxide obtained in the pores of the CMR is further transformed into the hydroxyl radicals, which oxidize the undesired organic compounds.…”

Section: Resultsmentioning

confidence: 99%

“…Another strategy was to prepare a microemulsion of hematite NPs and incorporate them into the hollow fiber by an inverse filtration procedure. Hematite NPs were synthesized by the water-in-oil microemulsion method adapting different experimental protocols already reported in the literature. , The iron oxide NPs were obtained by mixing two w/o microemulsions. Hexadecyl trimethyl ammonium bromide (Fluka, ≥ 96%), n -butanol (Sigma-Aldrich, 99.8%), n -octane (Sigma-Aldrich, ≥ 99%), ferric chloride (Sigma-Aldrich), sodium hydroxide, and ultrapure water (Milli-Q water, Millipore) were used as the surfactant, cosurfactant, oil phase, Fe precursor, precipitant agent, and aqueous phase, respectively.…”

Section: Methodsmentioning

confidence: 99%

Catalytic Palladium-Based and Iron-Based Membrane Reactors: Novel Strategies of Synthesis

et al. 2019

View full text Add to dashboard Cite

Several procedures were employed in the preparation of different Pd- and Fe-based catalytic membrane reactors (CMRs) via the normal wet impregnation method, reverse filtration of a microemulsion, sputtering method, and the precipitation of a Fe complex. Depending on the chosen procedure, the metal active phase can be found on the exterior and/or interior part of the CMR or even in its pores in concentrations between 0.05 and 2 wt %. Moreover, we have managed to implement a unique systematic process to grow hydrotalcite in the pores of a Pd-CMR. To exemplify the activity of these new CMRs, we have tested them in the peroxidation of phenol and in situ epoxidation of trans-chalcone.

show abstract

“…The membrane configuration affects the membrane area per unit volume and is a key factor in determining the loading of the active components in the catalytic membrane. , The existing membrane configurations are mainly divided into flat-sheet membranes, , tubular membranes, , hollow-fiber membranes, , and nanofiber membranes. − Compared with flat-sheet and tubular membranes, hollow-fiber membranes of the same volume have higher surface areas, which can increase the loading of metal particles. Chen et al prepared Pd/hollow-fiber ceramic catalytic membranes using hollow-fiber ceramic membranes as the carrier.…”

Section: Development and Application Of Membrane Reactorsmentioning

confidence: 99%

Porous Membrane Reactors for Liquid-Phase Heterogeneous Catalysis

Jiang

Liu

Xing

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Reaction and separation are the core of chemical and petrochemical production processes. The problems of resource and energy waste and environmental pollution caused by the low efficiency of reaction and separation have become increasingly prominent and have been the bottlenecks, with regard to sustainable development of the industry. The development of membrane reactor technology to achieve efficient conversion and separation has become an important research direction. In this Review, porous membrane reactors are divided into three types: contactor, distributor, and extractor types, based on the function of the membrane. The latest research progress of our group in liquid-phase catalytic reactions and the research status in this field are reviewed. For the contactor-type membrane reactor, the design and preparation of the catalytic membrane are discussed from three aspects: membrane configuration, preparation method, and membrane surface modification. For the distributor-type membrane reactor, the focus is on the influences of the membrane microstructure and operating parameters on the droplet/bubble formation and mass transfer, as well as the application of distributor-type membrane reactors. For the extractor-type membrane reactor, after the configuration of the membrane reactor is introduced, the research progress of extractor-type membrane reactors for liquid-phase catalytic reactions is discussed from two aspects: the synergistic control of the catalysis and membrane separation processes, and the mechanism and control of membrane fouling. The industrialization of extractor-type membrane reactors is described. Finally, the future challenges and development directions of porous membrane reactors applied to liquid-phase catalytic reactions are discussed.

show abstract

Application of a catalytic membrane reactor to catalytic wet air oxidation of formic acid

Cited by 18 publications

References 18 publications

Heterogeneous catalytic oxidation of phenol by in situ generated hydrogen peroxide applying novel catalytic membrane reactors

Heterogeneous catalytic oxidation of phenol by in situ generated hydrogen peroxide applying novel catalytic membrane reactors

Catalytic Palladium-Based and Iron-Based Membrane Reactors: Novel Strategies of Synthesis

Porous Membrane Reactors for Liquid-Phase Heterogeneous Catalysis

Contact Info

Product

Resources

About