Cyclohexane dehydrogenation for thermochemical energy conversion

DeLancey, George B.; Kovenklioglu, Suphan; Ritter, Arthur; Schneider, James W.

doi:10.1021/i200023a016

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…Cyclohexane dehydrogenation (eq 10) was also proposed as TCS system in the early-1980s. 77 The endothermic step is the formation of benzene and hydrogen, and it takes place at temperatures close to 300 °C. 62,77 Similar to the previous reactions, C 6 H 12 dehydrogenation is a commercial process, with years of industrial experience.…”

Section: Hydrocarbon-based Heat Storagementioning

confidence: 99%

“…77 The endothermic step is the formation of benzene and hydrogen, and it takes place at temperatures close to 300 °C. 62,77 Similar to the previous reactions, C 6 H 12 dehydrogenation is a commercial process, with years of industrial experience. Nevertheless, it exhibits problems of reversibility, possible secondary reactions, toxicity (benzene), and hydrogen storage and requires the use of catalysts.…”

Section: Hydrocarbon-based Heat Storagementioning

confidence: 99%

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Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

et al. 2019

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Among renewable energies, wind and solar are inherently intermittent and therefore both require efficient energy storage systems to facilitate a round-the-clock electricity production at global scale. In this context, concentrated solar power (CSP) stands out among other sustainable technologies because it offers the interesting possibility of storing energy collected from the sun as heat, by sensible, latent or thermochemical means. Accordingly, continuous electricity generation in the power block is possible even during off-sun periods, providing CSP plants with a remarkable dispatchability. Sensible heat storage has been already incorporated to commercial CSP plants. However, due to its potentially higher energy storage density, thermochemical heat storage (TCS) systems emerge as an attractive alternative for the design of next generation power plants, which are expected to operate at higher temperatures. Through these systems, thermal energy is used to drive endothermic chemical reactions, which can subsequently release the stored energy when needed through a reversible exothermic step. This review analyzes the status 2 of this prominent energy storage technology, its major challenges and future perspectives, covering in detail the numerous strategies proposed for the improvement of materials and thermochemical reactors. Thermodynamic calculations allow selecting high energy density systems, but experimental findings indicate that sufficiently rapid kinetics and long-term stability trough continuous cycles of chemical transformation are also necessary for practical implementation. In addition, selecting easy to handle materials with reduced cost and limited toxicity is crucial for large-scale deployment of this technology. In this work, the possible utilization of materials as diverse as metal hydrides, hydroxides or carbonates for thermochemical storage is discussed. Furthermore, especial attention is paid to the development of redox metal oxides, such as Co3O4/CoO, Mn2O3/Mn3O4 and perovskites of different compositions, as an auspicious new class of TCS materials due to the advantage of working with atmospheric air as reactant, avoiding the need of gas storage tanks. Current knowledge about the structural, morphological and chemical modifications of these solids, either caused during redox transformations, or induced wittingly as a way to improve their properties, is revised in detail. In addition, the design of new reactors concepts proposed for the most efficient use of TCS in concentrated solar facilities is also critically considered. Finally, strategies for the harmonic integration of these units in functioning solar power plants, as well as the economic aspects are also briefly assessed.

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Section: Hydrocarbon-based Heat Storagementioning

confidence: 99%

Section: Hydrocarbon-based Heat Storagementioning

confidence: 99%

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

et al. 2019

View full text Add to dashboard Cite

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“…The enthalpy of reaction is very large. Moreover, the technology for the hydrogenation of benzene has already formed the industrial scale [18], which will promote the potential application of the cyclohexane/benzene/hydrogen system for the chemical reaction heat storage. Therefore, this reversible reaction is considered as a promising candidate for chemical reaction heat storage.…”

Section: Chemical Reaction Heat Storagementioning

confidence: 99%

A review of promising candidate reactions for chemical heat storage

Yan

Wang

et al. 2015

Renewable and Sustainable Energy Reviews

316

135

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“…However, cyclohexane (CHA) dehydrogenating to benzene may occur without passing through detection of cyclohexene. A number of authors [30][31][32][33][34] have assumed that CHE, as an intermediate in CHA dehydrogenation, has never been directly detected. Land et al 35 have since directly detected CHE as an intermediate.…”

Section: Activation Parameters For Che Hydrogenation Using Bimetallicmentioning

confidence: 99%

Cyclohexene Hydroconversion Using Monometallic and Bimetallic Catalysts Supported on γ‐Alumina

Aboul-Gheit¹,

Abdel‐Hamid²,

Aboul-Fotouh³

et al. 2006

J Chinese Chemical Soc

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The hydroconversion of cyclohexene (CHE) using monometallic catalysts containing 0.35wt% of Pt, Pd, Ir or Re on a γ‐alumina support, as well as bimetallic catalysts containing combinations of 0.35wt% Pt with 0.35wt% of either Pd, Ir or Re on γ‐alumina, were investigated in a plug flow‐type fixed‐bed reactor. The Cyclohexene (CHE) feed was injected continuously with a rate of 8.33 × 10−3mole h−1 on 0.2 g of catalyst using a simultaneous hydrogen gas flow of 20 cm3 min−1 throughout a broad reaction temperature range of 50–400 °C. The dispersion of the metals in the catalysts was determined via H2 or CO chemisorption. The activities of the monometallic catalysts were found to be in the order: Pd > Pt > Ir > Re, whereas those of the bimetallic catalysts were in the order: PtPd > PtIr > PtRe. Cyclohexene hydrogenation and dehydrogenation reactions using the current mono‐ and bimetallic catalysts were kinetically investigated applying the absolute reaction rate theory, whereby reaction rate constant, activation energy, enthalpy and entropy of activation were computed to explain surface variations on these catalysts.

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Cyclohexane dehydrogenation for thermochemical energy conversion

Cited by 15 publications

References 4 publications

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

A review of promising candidate reactions for chemical heat storage

Cyclohexene Hydroconversion Using Monometallic and Bimetallic Catalysts Supported on γ‐Alumina

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