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Mechanistic and kinetic study of thermolysis reaction with hydrolysis step products in Cu–Cl thermochemical cycle.

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Title: Mechanistic and kinetic study of thermolysis reaction with hydrolysis step products in Cu–Cl thermochemical cycle.
Authors: Thomas, Deepa1,2 (AUTHOR) deepat@barc.gov.in, Baveja, Neetu A.1 (AUTHOR), Shenoy, K.T.1 (AUTHOR), Joshi, J.B.2,3 (AUTHOR)
Source: International Journal of Hydrogen Energy. Apr2021, Vol. 46 Issue 24, p12672-12681. 10p.
Subjects: Thermolysis, Hydrolysis, Hydrogen production, Oxygen in water, Low temperatures
Abstract: Copper–Chlorine cycle has been identified as the most prospective among the low temperature thermochemical cycles for hydrogen production. The cycle consists of two thermal reaction steps, one electrochemical step and a physical separation step. The two thermal reaction steps, hydrolysis and thermolysis are carried out in series for water splitting and oxygen production, respectively. The solid product from hydrolysis step Cu 2 OCl 2 enters the thermolysis step where it undergoes decomposition to CuCl and O 2. In the present work, thermolysis experiments were carried out in a laboratory scale horizontal furnace reactor with CuO–CuCl 2 equimolar mixture and Cu 2 OCl 2 in the temperature range of 470–575 °C. Experiments in furnace reactor show that, under otherwise same conditions, similar conversions are obtained with Cu 2 OCl 2 as well as with the equimolar mixture of CuO–CuCl 2. It was also observed that the conversion increased with an increase in CuCl 2 percentage in the reaction mixture. From the experimental data, an attempt has been made to provide insights into the reaction mechanism and kinetics. These results are expected to be useful for the design and scale-up of the thermolysis reactor. • Thermolysis experiments with products from the preceding hydrolysis step. • Thermolysis mechanistic study using isoconvertional analysis. • Two different pathways for integration of hydrolysis and thermolysis steps. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Copper–Chlorine cycle has been identified as the most prospective among the low temperature thermochemical cycles for hydrogen production. The cycle consists of two thermal reaction steps, one electrochemical step and a physical separation step. The two thermal reaction steps, hydrolysis and thermolysis are carried out in series for water splitting and oxygen production, respectively. The solid product from hydrolysis step Cu 2 OCl 2 enters the thermolysis step where it undergoes decomposition to CuCl and O 2. In the present work, thermolysis experiments were carried out in a laboratory scale horizontal furnace reactor with CuO–CuCl 2 equimolar mixture and Cu 2 OCl 2 in the temperature range of 470–575 °C. Experiments in furnace reactor show that, under otherwise same conditions, similar conversions are obtained with Cu 2 OCl 2 as well as with the equimolar mixture of CuO–CuCl 2. It was also observed that the conversion increased with an increase in CuCl 2 percentage in the reaction mixture. From the experimental data, an attempt has been made to provide insights into the reaction mechanism and kinetics. These results are expected to be useful for the design and scale-up of the thermolysis reactor. • Thermolysis experiments with products from the preceding hydrolysis step. • Thermolysis mechanistic study using isoconvertional analysis. • Two different pathways for integration of hydrolysis and thermolysis steps. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2021.01.118