Synthesis of binary Co–Mg–O oxide system and study of its behavior in reduction/oxidation cycling

Vedyagin, Aleksey A.; Karnaukhov, Timofey M.; Cherepanova, Svetlana V.; Stoyanovskii, Vladimir O.; Rogov, Vladimir A.; Mishakov, Ilya V.

doi:10.1016/j.ijhydene.2018.05.044

Cited by 16 publications

(6 citation statements)

References 46 publications

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“…In this case, the second component should be further introduced in the form of organometallic compounds [ 18 ], which are exotic and expensive precursors. An alternative approach has been reported in a number of recent publications [ 19 , 20 , 21 , 22 , 23 ]. In these papers, the hydrolysis stage was efficiently performed using an aqueous solution of the inorganic salt precursor.…”

Section: Introductionmentioning

confidence: 99%

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

et al. 2022

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In the present work, a series of two-component Ni-Mg-O oxide systems were prepared using a sol–gel technique at varied pH of hydrolysis procedure. The aqueous solutions of nitric acid or ammonia were added to control the pH values. The xerogel samples obtained after drying were analysed using a thermogravimetric approach. The oxide systems were characterized by a set of physicochemical methods (low-temperature nitrogen adsorption, X-ray diffraction analysis, scanning electron microscopy, UV-vis spectroscopy, and temperature-programmed reduction method). The thermal stability of the samples was examined in a testing reaction of CO oxidation in a prompt thermal aging regime. It was revealed that the pH value during the magnesium methoxide hydrolysis stage significantly affects the properties of the intermediate hydroxide and final oxide nanomaterials. The thermal decomposition of nitric acid or ammonia is accompanied by exothermal effects, which noticeably influence the textural characteristics. Moreover, the pH of the hydrolysing solution defines the strength of the nickel interaction with the MgO matrix. An increase in pH facilitates the formation of the NixMg1−xO solid solution with a higher amount of incorporated nickel, which is characterized by the reproducible broad temperature range of the hydrogen uptake and the enhanced thermal stability.

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Section: Introductionmentioning

confidence: 99%

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

et al. 2022

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“…MgO matrix protects the cobalt oxide species from agglomeration and migration at high operating temperatures. Thereby, the Co-Mg-O system has stable and reproducible performance in cyclic reduction/reoxidation reactions in the hydrogen production industry [239]. Ni-Mg-O is another binary system where nickel oxide species are uniformly distributed within the magnesium oxide matrix.…”

Section: Other Metal Oxide Cyclesmentioning

confidence: 99%

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

2022

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The thermochemical water-splitting method is a promising technology for efficiently converting renewable thermal energy sources into green hydrogen. This technique is primarily based on recirculating an active material, capable of experiencing multiple reduction-oxidation (redox) steps through an integrated cycle to convert water into separate streams of hydrogen and oxygen. The thermochemical cycles are divided into two main categories according to their operating temperatures, namely low-temperature cycles (<1100 °C) and high-temperature cycles (<1100 °C). The copper chlorine cycle offers relatively higher efficiency and lower costs for hydrogen production among the low-temperature processes. In contrast, the zinc oxide and ferrite cycles show great potential for developing large-scale high-temperature cycles. Although, several challenges, such as energy storage capacity, durability, cost-effectiveness, etc., should be addressed before scaling up these technologies into commercial plants for hydrogen production. This review critically examines various aspects of the most promising thermochemical water-splitting cycles, with a particular focus on their capabilities to produce green hydrogen with high performance, redox pairs stability, and the technology maturity and readiness for commercial use.

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“…The sol-gel techniques give a number of advantages, including the mentioned small particle size and uniform distribution of one component within the matrix of another component serving as the support. Recently, such a sol-gel approach was successfully applied to prepare the two- and three-component oxide systems based on the MgO matrix [ 57 , 58 , 59 , 60 ]. Magnesium oxide is a unique material possessing attractive textural characteristics such as developed specific surface area and porosity.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesis and Characterization of the Cu-Mg-O System for Chemical Looping Application

et al. 2022

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A sol-gel technique was applied to prepare the two-component oxide system Cu-Mg-O, where MgO plays the role of oxide matrix, and CuO is an active chemical looping component. The prepared samples were characterized by scanning electron microscopy, low-temperature nitrogen adsorption, and X-ray diffraction analysis. The reduction behavior of the Cu-Mg-O system was examined in nine consecutive reduction/oxidation cycles. The presence of the MgO matrix was shown to affect the ability of CuO towards reduction and re-oxidation significantly. During the first reduction/oxidation cycle, the main characteristics of the oxide system (particle size, crystallization degree, etc.) undergo noticeable changes. Starting from the third cycle, the system exhibits a stable operation, providing the uptake of similar hydrogen amounts within the same temperature range. Based on the obtained results, the two-component Cu-Mg-O system can be considered as a prospective chemical looping agent.

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Synthesis of binary Co–Mg–O oxide system and study of its behavior in reduction/oxidation cycling

Cited by 16 publications

References 46 publications

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

Preparation of the Nanostructured Ni-Mg-O Oxide System by a Sol–Gel Technique at Varied pH

A Review on Recent Progress in the Integrated Green Hydrogen Production Processes

Sol-Gel Synthesis and Characterization of the Cu-Mg-O System for Chemical Looping Application

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