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Crystals
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Metal Oxide Composites as Oxygen Carriers for the Application of...
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Metal Oxide Composites as Oxygen Carriers for the Application of Chemical Looping Technologies

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (10 May 2022) | Viewed by 5269

Special Issue Editors

Dr. Fatih Gulec

E-Mail Website
Guest Editor
Chemical Engineering, Faculty of Engineering, University of Nottingham, Nottingham G72RD, UK
Interests: porous materials; metal oxide composites; oxygen carriers; chemical looping technologies; phase transitions; heterogeneous catalysis; zeolites; silicates; biomass processing technologies
Special Issues, Collections and Topics in MDPI journals
Dr. Yongliang (Harry) Yan

E-Mail Website
Guest Editor
Materials, Concepts and Reaction Engineering Group, School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
Interests: high-temperature solid-looping systems for carbon capture; thermochemical energy storage and low-carbon hydrogen production; harnessing the power of machine learning techniques for energy process systems and material developments
Dr. Peter Clough

E-Mail Website
Guest Editor
Energy and Power, School of Water, Energy and Environment, Cranfield University, Bedford, Bedfordshire MK43 0AL, UK
Interests: hydrogen; carbon capture and storage; sorption enhanced steam reforming; machine learning
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Chemical looping technologies have emerged as attractive processes for the applications of clean energy and syngas production. Thanks to its dual-fluidised bed reactor system, air never mixes with the fuel, which inherently separates CO2 from the other flue gas components. Metal oxides, such as Cu-, Co-, Mn-, Ni-, Fe-based and their composites, transfer the oxygen between these two interconnected reactors as oxygen carriers and play a crucial role in the commercialisation of the chemical looping technologies. Successful applications of these technologies will require an extensive understanding of metal oxide composites, such as large-scale synthesis procedures, reactivity, surface interactions with additives, phase and structural changes, interaction with fuels, and long-term stability and reliability. Additionally, both modelling and experimental studies on the application of composite metal oxides could be an effective way to identify the candidates for chemical looping technologies. We invite researchers to contribute to the Special Issue on “Metal Oxide Composites as Oxygen Carriers for the Application of Chemical Looping Technologies”, which is intended to serve as a forum covering broad aspects of the science, technology, and applications of metal oxide composites as oxygen carriers in chemical looping technologies. 

The potential topics include, but are not limited to:

  • Synthesis of novel metal oxide composites as oxygen carriers;
  • Advanced material characterisation techniques on oxygen carriers;
  • Phase and structural changes of oxygen carriers in chemical looping applications;
  • Kinetics of oxygen carriers under chemical looping applications;
  • Computational modelling of surface interactions of oxygen carriers with additives;
  • Quantitative structure property relationships and predictions of new oxygen carriers.

Dr. Fatih Gulec
Dr. Yongliang (Harry) Yan
Dr. Peter Clough
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metal oxide composites
  • material characterisation
  • chemical looping combustion
  • chemical looping gasification
  • chemical looping hydrogen production
  • chemical looping selective oxidation
  • chemical looping air separation
  • chemical looping–thermochemical energy storages
  • new chemical looping applications

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Published Papers (2 papers)

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Research

17 pages, 5479 KiB  
Article
Feasibility Study of an Iron-Based Composite Added with Al2O3/ZrO2 as an Oxygen Carrier in the Chemical Looping Applications
by Ching-Ti Kao, Cheng-Hsien Shen and Heng-Wen Hsu
Crystals 2021, 11(8), 971; https://doi.org/10.3390/cryst11080971 - 17 Aug 2021
Cited by 4 | Viewed by 2295
Abstract
The chemical looping process is a promising approach for carbon capture. Oxygen carriers play the crucial role of carrying oxygen between oxidation and reduction reactors. In this study, iron-based composites, added with alumina and zirconia, were used as the oxygen carriers. The feasibility [...] Read more.
The chemical looping process is a promising approach for carbon capture. Oxygen carriers play the crucial role of carrying oxygen between oxidation and reduction reactors. In this study, iron-based composites, added with alumina and zirconia, were used as the oxygen carriers. The feasibility study of these composites for chemical looping applications was then evaluated by measuring their properties, including mechanical properties, relative density, microstructures, crystal structure, and their capacity of oxygen. The results suggest that the addition of zirconia led the decrease of the bulk relative density and thus had a negative effect to both crush strength and attrition. Crush strength declined from 57 kgf to 26 kgf when using zirconia, replacing alumina, in an iron-based composite as the inner material. In addition, the phases in oxidizing and reducing reaction were also revealed. The formation of the spinel phase (FeAl2O4) was the major factor that altered the capacity of oxygen. It inhibited Fe2O3’s ability to be completely reduced to Fe and thus decrease the capacity of oxygen. The value was therefore decreased from 9.7% to 6.2% after 50 redox cycles in alumina addition composite. On the other hand, for the zirconia addition, all of the Fe2O3 could transform to Fe, which provided 8.5% of oxygen capacity after 50 redox cycles. A dense layer which was identified as the Fe2O3 in the bulk surface was observed in the samples reacted with 50 redox cycles. The proposed mechanism of the formation of Fe2O3 layer and its corresponding kinetic analysis was also revealed in this study. Full article
(This article belongs to the Special Issue Metal Oxide Composites as Oxygen Carriers for the Application of Chemical Looping Technologies)
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14 pages, 3208 KiB  
Article
Effect of Precipitated Precursor on the Catalytic Performance of Mesoporous Carbon Supported CuO-ZnO Catalysts
by Yandong Li, Guangfen Liang, Chengrui Wang, Yanhong Fang and Huamei Duan
Crystals 2021, 11(6), 582; https://doi.org/10.3390/cryst11060582 - 22 May 2021
Cited by 3 | Viewed by 2037
Abstract
As part of concepts for chemical energy storage of excess chemical energy produced from renewable sources, we investigated the performance of CuO/ZnO catalysts supported on mesoporous carbon to convert CO2 hydrogenation to methanol. In this work, mesoporous carbon was used as the [...] Read more.
As part of concepts for chemical energy storage of excess chemical energy produced from renewable sources, we investigated the performance of CuO/ZnO catalysts supported on mesoporous carbon to convert CO2 hydrogenation to methanol. In this work, mesoporous carbon was used as the catalyst support for CuO-ZnO catalysts. Four catalysts with different precipitated precursors were synthesized and analyzed by N2-physisorption, X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that catalyst CZ-in situ had the highest turnover frequency (TOF) (2.8 × 10−3 s−1) and methanol production rate (0.8 mmol g−1·h−1). The catalysts for co-precipitation of copper and zinc on carbon precursors are more active. Cu/ZnO domains that are accessible to the reactant gas are another reason for the catalysts being active. The Cu-ZnO interface is crucial to methanol catalyst activity. Full article
(This article belongs to the Special Issue Metal Oxide Composites as Oxygen Carriers for the Application of Chemical Looping Technologies)
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