Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 66, Pages 28322-28352Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.06.170
Keywords
H-2 generation; Chemical looping techniques; Oxygen carrier; Carbon capture
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This article discusses the limitations of hydrogen as an energy resource, as well as the methods of producing hydrogen using solar, biological, or electrical sources. Chemical-looping technology has gained widespread attention in recent years as a way to produce hydrogen, with the article also comparing the H-2 yield data of different oxygen carriers.
Natural H-2 in useful quantities is negligible, which makes hydrogen unsuitable as an en-ergy resource compared to other fuels. H-2 production by solar, biological, or electrical sources needs more energy than obtained by combusting it. Lower generation of pollutants and better energy efficiency makes hydrogen a potential energy carrier. Hydrogen finds potential applications in automobile and energy production. However, the cost of pro-ducing hydrogen is extremely high. Chemical-looping technology for H-2 generation has caught widespread attention in recent years. This work, presents some recent findings and provides a comprehensive overview of different chemical looping techniques such as chemical looping reforming, syngas chemical looping, coal direct chemical looping, and chemical looping hydrogen generation method for H-2 generation. The above processes are discussed in terms of the relevant chemical reactions and the associated heat of reactions to ascertain the overall endothermicity or exothermicity of the H-2 production. We have compared the H-2 yield data of different Fe/Ni, spinel and perovskites-based oxygen carriers (OC) reported in previous literature. This review is the first comprehensive study to compare the H-2 yield data of all the previously reported oxygen carriers as a function of temperature and redox cycles. In addition, the article summarizes the characteristics and reaction mechanisms of various oxygen carrier materials used for H-2 generation. Lastly, we have reviewed the application of Density Function Theory (DFT) to study the effect of various dopant addition on the efficiency of H-2 production of the oxygen carriers and discussed ASPEN simulations of different chemical looping techniques.(C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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