Gas-phase photocatalysis in μ-reactors

Vesborg, Peter Christian Kjærgaard; Olsen, Jakob Lind; Henriksen, Toke Riishøj; Chorkendorff, Ib; Hansen, Ole

doi:10.1016/j.cej.2010.03.083

Cited by 37 publications

(35 citation statements)

References 15 publications

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“…The µ-reactor used in this work, was particularly designed to study gas-phase reactions of model catalysts. The device and its fabrication, as well as the measurements setup has been described in large detail [197,305,306,307,308,309,96], thus only a very brief summary is given here. The advantages of the system are the small reactor volume, the efficient heating or cooling (due to the small dimensions) and by using a glass lid the possibility for photocatalytic experiments [310,311].…”

Section: µ-Reactorsmentioning

confidence: 99%

Catalysis with Supported Size-selected Pt Clusters

Schweinberger¹

2014

Springer Theses

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Under ultra high vacuum conditions the electronic structure, adsorption properties and reactivity of two olefins on surfaces and Pt clusters were probed in the submonolayer range. With adsorbed trichloroethene a possible cluster-adsorbate induced change in the electronic structure and for ethene a low temperature, size dependent self-/hydrogenation was observed.In a collaborative approach, the Pt clusters were investigated under ambient pressure conditions. The clusters were characterized on local and integral level and tested towards temperature stability. Experiments in gas phase μ-reactors and in liquid, as part of a hybrid photo catalytic system, revealed size dependent reactivity.

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Section: µ-Reactorsmentioning

confidence: 99%

Catalysis with Supported Size-selected Pt Clusters

Schweinberger¹

2014

Springer Theses

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“…7(a) shows that the catalyst is active for photocatalytic CO oxidation, as expected. 5 Both CO and O 2 are consumed and CO 2 evolves when the sample is illuminated. At the same time, the absorbance is recorded (solid line in Fig.…”

Section: B Photocatalytic Activity and In Situ Uv-vis Absorbance: Phmentioning

confidence: 99%

“…Regarding photocatalysis, oxidation reactions (of carbon monoxide, methane, methanol, etc.) 5 and overall water splitting 6,7 have been studied, also fundamental photocatalytic mechanisms have been investigated. 8 All of the studies mentioned were carried out with our standard silicon based μ-reactor and the reaction products and activity were measured with a QMS.…”

Section: Introductionmentioning

confidence: 99%

A transparent Pyrex μ-reactor for combined in situ optical characterization and photocatalytic reactivity measurements

Dionigi

Nielsen

Pedersen

et al. 2013

Review of Scientific Instruments

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A new Pyrex-based μ-reactor for photocatalytic and optical characterization experiments is presented. The reactor chamber and gas channels are microfabricated in a thin poly-silicon coated Pyrex chip that is sealed with a Pyrex lid by anodic bonding. The device is transparent to light in the UV-vis-near infrared range of wavelengths (photon energies between ∼0.4 and ∼4.1 eV). The absorbance of a photocatalytic film obtained with a light transmission measurement during a photocatalytic reaction is presented as a proof of concept of a photocatalytic reactivity measurement combined with in situ optical characterization. Diffuse reflectance measurements of highly scattering photocatalytic nanopowders in a sealed Pyrex μ-reactor are also possible using an integrating sphere as shown in this work. These experiments prove that a photocatalyst can be characterized with optical techniques after a photocatalytic reaction without removing the material from the reactor. The catalyst deposited in the cylindrical reactor chamber can be illuminated from both top and bottom sides and an example of application of top and bottom illumination is presented.

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“…The catalyst under investigation is deposited in the microreactor reactor volume by e.g., evaporation, 3 drop casting, 10 or gas aggregation formed size-selected nanoparticles. The gas composition in the microreactor, reactor volume is ionized by the modified ion gauge and is subsequently focused by the Einzel lenses into the source region.…”

Section: System Designmentioning

confidence: 99%

High mass resolution time of flight mass spectrometer for measuring products in heterogeneous catalysis in highly sensitive microreactors

Andersen

Jensen

Christensen

et al. 2012

Review of Scientific Instruments

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We demonstrate a combined microreactor and time of flight system for testing and characterization of heterogeneous catalysts with high resolution mass spectrometry and high sensitivity. Catalyst testing is performed in silicon-based microreactors which have high sensitivity and fast thermal response. Gas analysis is performed with a time of flight mass spectrometer with a modified nude Bayard-Alpert ionization gauge as gas ionization source. The mass resolution of the time of flight mass spectrometer using the ion gauge as ionization source is estimated to m/Δm > 2500. The system design is superior to conventional batch and flow reactors with accompanying product detection by quadrupole mass spectrometry or gas chromatography not only due to the high sensitivity, fast temperature response, high mass resolution, and fast acquisition time of mass spectra but it also allows wide mass range (0–5000 amu in the current configuration). As a demonstration of the system performance we present data from ammonia oxidation on a Pt thin film showing resolved spectra of OH and NH3.

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Gas-phase photocatalysis in μ-reactors

Cited by 37 publications

References 15 publications

Catalysis with Supported Size-selected Pt Clusters

Catalysis with Supported Size-selected Pt Clusters

A transparent Pyrex μ-reactor for combined in situ optical characterization and photocatalytic reactivity measurements

High mass resolution time of flight mass spectrometer for measuring products in heterogeneous catalysis in highly sensitive microreactors

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