Bubble formation in catalyst pores: curse or blessing?

Research output: Contribution to specialist publicationArticleProfessional

Abstract

H2O2 decomposition experiments on Pt were performed in a glass microreactor, simulating arrays of catalyst pores. The formation of bubbles inside the model nanopores was observed with an optical microscope. It was found that the bubble initiation time strongly depends on the diffusion length and the H2O2 concentration. The amount of catalyst did not have a significant effect, suggesting that the reaction is diffusion limited. Results show that bubble formation can decrease the reaction rate by physically blocking the active
sites, but also can accelerate the reaction by creating a forced convective flow inside the nanochannels due to bubble migration. Similar behaviour is likely to occur in a real catalyst and thus, a smart design of the catalytic support could be used to enhance reaction rates.
Original languageEnglish
Pages826-833
Number of pages8
Volume3
No.5
Specialist publicationReaction chemistry & engineering
DOIs
Publication statusPublished - 24 Sep 2018

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Bubble formation
Catalysts
Reaction rates
Nanopores
Catalyst supports
Microscopes
Decomposition
Glass
Experiments

Keywords

  • Heterogeneous catalysis
  • hydrogen peroxide decomposition
  • model catalyst
  • Bubble formation

Cite this

@misc{5ec7eba25e2143b5845b6be245d1ba48,
title = "Bubble formation in catalyst pores: curse or blessing?",
abstract = "H2O2 decomposition experiments on Pt were performed in a glass microreactor, simulating arrays of catalyst pores. The formation of bubbles inside the model nanopores was observed with an optical microscope. It was found that the bubble initiation time strongly depends on the diffusion length and the H2O2 concentration. The amount of catalyst did not have a significant effect, suggesting that the reaction is diffusion limited. Results show that bubble formation can decrease the reaction rate by physically blocking the activesites, but also can accelerate the reaction by creating a forced convective flow inside the nanochannels due to bubble migration. Similar behaviour is likely to occur in a real catalyst and thus, a smart design of the catalytic support could be used to enhance reaction rates.",
keywords = "Heterogeneous catalysis, hydrogen peroxide decomposition, model catalyst, Bubble formation",
author = "{Brunet Espinosa}, Roger and Duits, {Michel H.G.} and Dani{\"e}l Wijnperle and Frieder Mugele and Leon Lefferts",
year = "2018",
month = "9",
day = "24",
doi = "10.1039/C8RE00110C",
language = "English",
volume = "3",
pages = "826--833",
journal = "Reaction chemistry & engineering",
issn = "2058-9883",
publisher = "Royal Society of Chemistry",

}

Bubble formation in catalyst pores : curse or blessing? / Brunet Espinosa, Roger ; Duits, Michel H.G.; Wijnperle, Daniël ; Mugele, Frieder; Lefferts, Leon.

In: Reaction chemistry & engineering, Vol. 3, No. 5, 24.09.2018, p. 826-833.

Research output: Contribution to specialist publicationArticleProfessional

TY - GEN

T1 - Bubble formation in catalyst pores

T2 - curse or blessing?

AU - Brunet Espinosa, Roger

AU - Duits, Michel H.G.

AU - Wijnperle, Daniël

AU - Mugele, Frieder

AU - Lefferts, Leon

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AB - H2O2 decomposition experiments on Pt were performed in a glass microreactor, simulating arrays of catalyst pores. The formation of bubbles inside the model nanopores was observed with an optical microscope. It was found that the bubble initiation time strongly depends on the diffusion length and the H2O2 concentration. The amount of catalyst did not have a significant effect, suggesting that the reaction is diffusion limited. Results show that bubble formation can decrease the reaction rate by physically blocking the activesites, but also can accelerate the reaction by creating a forced convective flow inside the nanochannels due to bubble migration. Similar behaviour is likely to occur in a real catalyst and thus, a smart design of the catalytic support could be used to enhance reaction rates.

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