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Chemical Looping for Syngas Production
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Chemical Looping for Syngas Production

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "I3: Energy Chemistry".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 3125

Special Issue Editors

Dr. Zhen Huang

E-Mail Website
Guest Editor
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou 510640, China
Interests: biomass gasification; chemical looping conversion; pollutants removal
Dr. Kun Zhao

E-Mail Website
Guest Editor
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou 510640, China
Interests: chemical looping; syngas production; CO2 utilization; OCM
Special Issues, Collections and Topics in MDPI journals
Dr. Yunfei Gao

E-Mail Website
Guest Editor
Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai, China
Interests: chemical looping; catalysis; gasification; CO2 utilization; fuel cell
Dr. Shiwen Fang

E-Mail Website
Guest Editor
College of Mechanical and Electrical Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou, China
Interests: chemical looping gasification; waste to energy; pollution control
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the goal of "carbon neutrality" being put forward, it is of great social significance to seek efficient and clean utilization routes for the utilization of carbon-containing fuels. In accordance with the requirements of sustainable economy and carbon neutrality, it is critical for the transformation of modern society to improve the advanced process for energy and chemical production. Chemical looping, which decomposes a chemical reaction into several sub-reactions using an oxygen carrier as the intermediate and enables the clean conversion of carbon-containing fuels with inherent CO2 capture, is an environmentally friendly, highly flexible and more efficient strategy in optimizing the conversion process of solid fuel (coal, biomass, municipal solid waste, etc.) for energy and chemical production. The early applications of the solid fuel chemical looping cycle concept mainly include high-purity CO2 production and power generation, and it has now been widely applied for various value-added products, such as hydrogen, syngas, and ammonia. The main components of the resulting syngas are H2 and CO, which can be subsequently employed as a multifunctional platform to produce various desired products, such as electricity, heat, hydrogen, methane, methanol, dimethyl ether, Fischer–Tropsch (FT) liquids and ammonia. There is great potential for chemical looping technology to upgrade the solid fuel industry towards more low-carbon, high-efficiency and environmentally friendly practice.

The aim of this Special Issue is to present and disseminate the most recent advances in the field of chemical looping for syngas production.

Topics of interest for publication include, but are not limited to:

  • Original results from chemical looping gasification from coal, biomass, methane, solid waste, etc.
  • Research and analysis of chemical looping processes for producing syngas and chemicals (e.g., H2/CO syngas, hydrogen, ammonia, C-H chemicals etc.).
  • Oxygen carriers research and development.
  • Chemical looping process development and optimization.
  • Chemical looping reactor design.
  • Innovation of chemical looping gasification reaction mechanism.
  • CFD modelling of sub-processes and overall process.
  • Process simulation and evaluation for chemical looping of solid fuel.
  • Pollutant removal.
  • CO2

Dr. Zhen Huang
Dr. Kun Zhao
Dr. Yunfei Gao
Dr. Shiwen Fang
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. Energies is an international peer-reviewed open access semimonthly 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 2600 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

  • chemical looping gasification
  • chemical looping combustion
  • production of syngas
  • oxygen carriers
  • pollutant removal
  • tar reforming
  • coal clean conversion
  • biomass conversion
  • municipal solid waste
  • hydrogen production
  • ammonia production
  • green catalysis process
  • kinetics research
  • reactor design
  • molecular simulation
  • process simulation
  • CFD process modeling
  • techno-economic assessment

Published Papers (2 papers)

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Research

16 pages, 4558 KiB  
Article
Evaluation of the Reactivity of Hematite Oxygen Carriers Modified Using Alkaline (Earth) Metals and Transition Metals for the Chemical Looping Conversion of Lignite
by Hsiao Mun Lee, Jiahui Xiong, Xinfei Chen, Haitao Wang, Da Song, Jinlong Xie, Yan Lin, Ya Xiong, Zhen Huang and Hongyu Huang
Energies 2023, 16(6), 2662; https://doi.org/10.3390/en16062662 - 12 Mar 2023
Viewed by 1411
Abstract
Chemical looping (CL) technology is a novel technology for the clean and efficient use of energy. Oxygen carriers (OCs) are the cornerstone of CL technology. The development of low–cost, high–performance OCs is crucial for the application of CL conversion. Hematite, one of the [...] Read more.
Chemical looping (CL) technology is a novel technology for the clean and efficient use of energy. Oxygen carriers (OCs) are the cornerstone of CL technology. The development of low–cost, high–performance OCs is crucial for the application of CL conversion. Hematite, one of the natural Fe–based OCs, has several advantages (e.g., low cost and environmental friendliness), but its low reactivity limits its application in CL. The performance of hematite can be effectively improved by modifying some of its active components. This study explored the improvement of hematite reactivity by adding alkaline (earth) metals (K, Na, and Ca) and transition metals (Ni, Cu, and Mn). The crystal phases of the OCs were characterized using X-ray diffraction (XRD), and the results revealed that the addition of metals significantly changed the phase of the original hematite. The active solid solution of K–Fe–O and Na–Fe–O species exhibited strong catalytic activity to facilitate lignite char conversion. The addition of CaO promoted the devolatilization of lignite, while the formation of a solid CaFe2O4 solution with low reactivity inhibited the lattice oxygen release. The presence of CuO/CuFe2O4 in the Cu–modified sample could release a small amount of free O2 to promote volatile conversion. The high activity phases of NiO and NiFe2O4 in the Ni–modified OCs could improve the reaction activity of hematite. However, the MnFeO3 phase with low reaction activity was generated in the Mn–modified OC, decreasing the reaction rate of the Mn–modified OC with lignite char. Full article
(This article belongs to the Special Issue Chemical Looping for Syngas Production)
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16 pages, 4237 KiB  
Article
Chemical Looping Gasification of Wood Waste Using NiO-Modified Hematite as an Oxygen Carrier
by Jinlong Xie, Kang Zhu, Zhen Zhang, Xinfei Chen, Yan Lin, Jianjun Hu, Ya Xiong, Yongqi Zhang, Zhen Huang and Hongyu Huang
Energies 2023, 16(4), 1847; https://doi.org/10.3390/en16041847 - 13 Feb 2023
Cited by 1 | Viewed by 1364
Abstract
Chemical looping gasification (CLG) technology is an effective approach to converting wood waste into high-quality syngas. In the present work, the reactivity of natural hematite is enhanced by doping with nickel oxide (NiO), and the effects of various operating parameters upon the CLG [...] Read more.
Chemical looping gasification (CLG) technology is an effective approach to converting wood waste into high-quality syngas. In the present work, the reactivity of natural hematite is enhanced by doping with nickel oxide (NiO), and the effects of various operating parameters upon the CLG of wood waste are investigated using the NiO-modified hematite as an oxygen carrier. The NiO-modified hematite gives a significantly increased carbon conversion of 79.74%, and a valid gas yield of 0.69 m3/kg, compared to 68.13% and 0.59 m3/kg, respectively, for the pristine (natural) hematite, and 54.62% and 0.55 m3/kg, respectively, for the Al2O3, thereby indicating that the modification with NiO improves reactivity of natural hematite towards the CLG of wood waste. In addition, a suitable mass ratio of oxygen carrier to wood waste (O/W) is shown to be beneficial for the production of high-quality syngas, with a maximum valid gas yield of 0.69 m3/kg at an O/W ratio of 1. Further, an increase in reaction temperature is shown to promote the conversion of wood waste, giving a maximum conversion of 86.14% at reaction temperature of 900 °C. In addition, the introduction of an appropriate amount of steam improves both the conversion of wood waste and the quality of the syngas, although excessive steam leads to decreases in the reaction temperature and gas residence time. Therefore, the optimum S/B (mass ratio of steam to biomass) is determined to be 0.4, giving a carbon conversion and valid gas yield of 86.63% and 0.94 m3/kg, respectively. Moreover, the reactivity of the NiO-modified hematite is well-maintained during 20 cycles, with a carbon conversion and valid gas yield of around 79% and 0.69 m3/kg, respectively. Additionally, the XRD and SEM-EDS analyses indicate no measurable change in the crystal phase of the re-oxidized oxygen carrier. Full article
(This article belongs to the Special Issue Chemical Looping for Syngas Production)
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