A Review of Catalytic Membrane Layers for Gas/Liquid Reactions

Dittmeyer, Roland; Svajda, Karel; Reif, Martin

doi:10.1023/b:toca.0000024925.30020.a1

Cited by 97 publications

(45 citation statements)

References 43 publications

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“…The concept of a porous catalytic membrane contactor ("catalytic diffuser" [20,[30][31][32]) was applied in this work to direct synthesis of hydrogen peroxide, offering a solution to the problem of poor Pd utilization while keeping the safety benefit of separation of the two gaseous reactants (Fig. 2).…”

Section: The Conceptmentioning

confidence: 99%

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Direct synthesis of hydrogen peroxide in a catalytic membrane contactor

Pashkova¹,

Svajda²,

Dittmeyer³

2008

Chemical Engineering Journal

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Section: The Conceptmentioning

confidence: 99%

“…Schematic representation of the catalytic diffuser concept[31] relying on the asymmetric structure of the membrane-a coarse-porous support, one or more intermediate layers with decreasing pore diameter and a thin fine-porous surface layer with the catalyst incorporated in highly dispersed form.…”

mentioning

confidence: 99%

Direct synthesis of hydrogen peroxide in a catalytic membrane contactor

Pashkova¹,

Svajda²,

Dittmeyer³

2008

Chemical Engineering Journal

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“…Furthermore, the inherent properties of the CMRs permit the direct synthesis of hydrogen peroxide starting from H 2 and O 2 using noble metal as an active phase [13][14][15][16][17][18][19][20]. The catalytic membrane reactors have a well defined three phase contact zone for gas-liquid reactions.…”

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

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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

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“…There is an increasing interest on the synthesis, features and application of catalytic membranes based on a thin Pd (or Pd-alloy) film on a ceramic support for a range of applications which include (i) high temperature applications (>300 8C) such as the continuous on-line separation of H 2 from steam reforming gases, the isotopic hydrogen separation and alkane dehydrogenation, (ii) medium temperature applications (200-250 8C) such as the direct synthesis of phenol from benzene + O 2 feeding H 2 through the metallic membrane; (iii) low temperature application (room temperature) such as the direct synthesis of hydrogen peroxide from hydrogen and oxygen and the reduction of nitrates in water [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%