Abstract
Liquid organic hydrides, e.g. 9-ethylcarbazole, are potentially interesting hydrogen storage materials because of their reversible hydrogen sorption properties. In this study, the isobaric specific heat capacity of 9- ethylcarbazole in solid and liquid phases was investigated using adiabatic calorimeter. The experimental setup consisting of two basic components adiabatic calorimeter and pressure unit was developed. To calibrate the apparatus the specific heat of the water was measured. The experimental data points were obtained at 0.1 MPa to 0.88 MPa pressure range and 353 K to 480 K temperature range. The specific heat dependence on pressure and temperature was presented. The increase in specific heat of 9-ethylcarbazole was observed with increasing pressure and temperature for solid phase, while for liquid phase decrease in trend was observed for increasing pressure. Keywords: 9-ethylcarbazole, Adiabatic Calorimeter, Specific Heat, Nitrogen Gas Cylinder
Highlights
Aromatic compounds can reversibly take up a large amount of hydrogen in chemical forms, which may offer a potential solution for storing hydrogen as a lightweight energy carrier. for instance, hydrogen gas can be supplied from these carriers on demand for mobile applications as a result of a change in pressure or temperature within a vehicle or device system. interestingly, the organic based liquid-phase hydrogen carriers when assembled with fuel cells have been recently shown to deliver substantially higher energy density packages than those of lithium ion batteries. furhtermore, hydrogen is thought to be one the most promising clean energy due to its many advantages such as pollution free, higher energy density, rich in quantity and highly efficient
Our experimental calculations for water revealed that this apparatus can be used to measure the specific heat of 9ethylcarbazole. 3.2 Specific heat of 9-ethylcarbazole in the solid phase Specific heat capacity is a measure of the amount of heat energy required to change the temperature of 1 kg of a material by 1 K
The specific heat of 9-ethylcarbazole in solid phase was measured at pressures ranging from 0.2 MPa to 0.8 MPa when the temperature was varied from 293 K to 325 K
Summary
Aromatic compounds can reversibly take up a large amount of hydrogen in chemical forms, which may offer a potential solution for storing hydrogen as a lightweight energy carrier. for instance, hydrogen gas can be supplied from these carriers on demand for mobile applications as a result of a change in pressure or temperature within a vehicle or device system. interestingly, the organic based liquid-phase hydrogen carriers when assembled with fuel cells have been recently shown to deliver substantially higher energy density packages than those of lithium ion batteries. furhtermore, hydrogen is thought to be one the most promising clean energy due to its many advantages such as pollution free, higher energy density, rich in quantity and highly efficient. There are many problems to use hydrogen in daily life, out of which hydrogen storage is a major bottleneck Due to these reasons, tremendous efforts have been made to search hydrogen storage materials which can hold hydrogen reversibly with high energy density [3], [4]. Hydrogen storage using organic heterocyclic liquid compound as a media is one of the most promising method for automotive applications These storage materials are liquids at near ambient conditions and can be catalytically hydrogenated and dehydrogenated at relatively moderate temperatures [5]. This process is reversible by which reactant and products can be recycled between hydrogenation and dehydrogenation [6]. A surplus amount of heat is required to complete the process for hydrogen storage due to which thermodynamic properties are very important to be known and these are affected by pressure
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