Irradiation-Driven Process Intensification in Heterogeneous Catalysis

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Environmental Catalysis".

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 6254

Special Issue Editors


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Guest Editor
Instituto de Nanociencia y Materiales de Aragon (INMA), Consejo Superior de Investigaciones Científicas (CSIC-Universidad de Zaragoza), 50009 Zaragoza, Spain
Interests: microwave-assisted catalysis; hydrocarbons valorization; C1 chemistry; multiphase reactors design and simulation; fluidization technology; computational modeling; membrane separations; structured catalysts and reactors; process intensification

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Guest Editor
Department of Chemistry and Molecular and Cell Biology, University of Leicester, Leicester LE1 7RH, UK
Interests: Photocatalysis; nanomaterials synthesis; spectroscopy; plasmon-assisted processes
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Special Issue Information

Dear Colleagues,

Process intensification represents any development that leads to a substantially smaller, cleaner, and more energy-efficient technology. In this regard, with this Special Issue, we intend to involve all such heterogeneous catalytic technologies that use electromagnetic radiation to attain that process intensification. Irradiation-driven catalytic routes include energy sources from any EM spectral region like UV-Vis, microwave, and radiofrequency, as well as any plasma-assisted heterogeneous catalysis originated. There is increasing interest in these technologies for their use in a number of gas-phase applications such as CO2 conversion into value-added chemicals and fuels, methane conversion into higher hydrocarbons or oxygenates and VOC remediation, among others. These and other important reactions take advantage of their operational principles: activation-energy reduction (photocatalysis), selective heating (microwaves), and ionization (plasma).

In particular, this Special Issue will cover a range of different aspects related to new trends devoted to irradiation-driven processes. These include materials synthesis and characterization, catalysts and reactors design and modeling, heterogeneous photocatalysis, microwave- and plasma-assisted heterogeneous catalysis, as well as techno-economic studies that evaluate the intensification potentials of such technologies against traditional catalytic conversion methods.

Submissions to this Special Issue are welcome in the form of original research papers or short reviews that reflect the state of the art in the above-mentioned applications.

Dr. Ignacio Julian
Dr. Carlos J. Bueno-Alejo
Guest Editors

Manuscript Submission Information

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Keywords

  • microwave-assisted catalysis
  • photocatalysis
  • plasma-assisted catalysis
  • ultrasound-assisted catalysis
  • dielectric heating
  • temperature measurement in EM-fields
  • plasmon resonance materials
  • plasma-catalyst interaction
  • dielectric barrier discharge
  • CO2 conversion
  • hydrocarbon valorization
  • pollutants remediation

Published Papers (2 papers)

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Research

10 pages, 2173 KiB  
Article
Catalyst Heating Characteristics in the Traveling-Wave Microwave Reactor
by Alberto Martínez González, Andrzej Stankiewicz and Hakan Nigar
Catalysts 2021, 11(3), 369; https://doi.org/10.3390/catal11030369 - 11 Mar 2021
Cited by 9 | Viewed by 3189
Abstract
Traveling-Wave Microwave Reactor (TMR) presents a novel heterogeneous catalytic reactor concept based on a coaxial waveguide structure. In the current paper, both modeling and experimental studies of catalyst heating in the TMR are presented. The developed 3D multiphysics model was validated from the [...] Read more.
Traveling-Wave Microwave Reactor (TMR) presents a novel heterogeneous catalytic reactor concept based on a coaxial waveguide structure. In the current paper, both modeling and experimental studies of catalyst heating in the TMR are presented. The developed 3D multiphysics model was validated from the electromagnetic and heat transfer points of view. Extrudes of silicon carbide (SiC) were selected as catalyst supports and microwave absorbing media in a packed-bed configuration. The packed-bed temperature evolution was in good agreement with experimental data, with an average deviation of less than 10%. Both experimental and simulation results show that the homogeneous temperature distribution is possible in the TMR system. It is envisioned that the TMR concept may facilitate process scale-up while providing temperature homogeneity beyond the intrinsic restrictions of microwave cavity systems. Full article
(This article belongs to the Special Issue Irradiation-Driven Process Intensification in Heterogeneous Catalysis)
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17 pages, 6940 KiB  
Article
Ultrasound-Assisted Preparation of Mo/ZSM-5 Zeolite Catalyst for Non-Oxidative Methane Dehydroaromatization
by Heidy Ramirez-Mendoza, Mafalda Valdez Lancinha Pereira, Tom Van Gerven, Cécile Lutz and Ignacio Julian
Catalysts 2021, 11(3), 313; https://doi.org/10.3390/catal11030313 - 27 Feb 2021
Cited by 9 | Viewed by 2362
Abstract
The activity and selectivity of Mo/ZSM-5, benchmarking catalyst for the non-oxidative dehydroaromatization of methane, strongly depend on the cluster size, spatial distribution, and chemical environment of the Mo-based active sites. This study discloses the use of an ultrasound-assisted ion-exchange (US-IE) technique as an [...] Read more.
The activity and selectivity of Mo/ZSM-5, benchmarking catalyst for the non-oxidative dehydroaromatization of methane, strongly depend on the cluster size, spatial distribution, and chemical environment of the Mo-based active sites. This study discloses the use of an ultrasound-assisted ion-exchange (US-IE) technique as an alternative Mo/ZSM-5 synthesis procedure in order to promote metal dispersion along the zeolite framework. For this purpose, a plate transducer (91.8 kHz) is employed to transmit the ultrasonic irradiation (US) into the ion-exchange reactor. The physico-chemical properties and catalytic activity of samples prepared under the said irradiation procedure and traditional impregnation (IWI) method are critically evaluated. Characterization results suggest that US neither affects the crystalline structure nor the particle size of the parent zeolite. However, US-IE promotes molybdenum species dispersion, avoids clustering at the external fresh zeolite surface and enhances molybdate species anchoring to the zeolite framework with respect to IWI. Despite the improved metal dispersion, the catalytic activity between catalysts synthesized by US-IE and IWI is comparable. This suggests that the sole initial dispersion enhancement does not suffice to boost the catalyst productivity and further actions such ZSM-5 support and catalyst pre-conditioning are required. Nevertheless, the successful implementation of US-IE and the resulting metal dispersion enhancement pave the way toward the application of this technique to the synthesis of other dispersed catalysts and materials of interest. Full article
(This article belongs to the Special Issue Irradiation-Driven Process Intensification in Heterogeneous Catalysis)
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