A comprehensive study to evaluate absolute uptake of carbon dioxide adsorption onto composite adsorbent. (April 2019)

• Record Type: Journal Article
• Authors: Berdenova, Bakytnur; Pal, Animesh; Muttakin, Mahbubul; Mitra, Sourav; Thu, Kyaw; Saha, Bidyut Baran; Kaltayev, Aidarkhan
• Is Part Of: International journal of refrigeration. Volume 100(2019)
• Page Start: 131
• Page End: 140
• Publication Date: 2019-04
• Subjects: Adsorption -- Absolute uptake -- Composite -- Isotherm model -- Thermal conductivity; Adsorption -- Absorption absolue -- Composite -- Modèle isotherme -- Conductivité thermique; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2019.01.014
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: Porous and thermal properties of synthesized composite were investigated. CO2 adsorption onto composite was measured for various temperatures and pressures. D-A and Tóth models were used to fit the absolute uptake. Isosteric heat of adsorption was estimated using Clausius–Clapeyron equation. Synthesized consolidated composite shows significant improvement in thermal conductivity. Abstract: In this study, new composite adsorbent with enhanced thermal conductivity and adsorption capacity was synthesized and analyzed comprehensively for the development of compact CO2 based adsorption cooling system. The consolidated composite was prepared employing activated carbon, graphene nanoplatelets and hydroxyl cellulose as a parent adsorbent, thermal conductivity enhancer, and binder, respectively. The surface area and pore volume of the composite were found to be 1778 ± 13 m 2 g −1 and 1.014 cm 3 g −1, respectively. In addition, the composite showed 233% higher thermal conductivity compared to the parent activated carbon. Adsorption characteristics of CO2 were measured at temperature ranging from 20 to 70 °C and pressures up to 5 MPa. Absolute uptake was evaluated from excess adsorption based on the following two methods: (i) the adsorbed phase volume is equal to the pore volume of the adsorbent; and (ii) the adsorbed phase volume is almost zero under low pressure and/or high temperature conditions. Furthermore, the averaging of above two methods was also taken for avoiding these two extreme assumptions. Obtained absolute adsorption uptake data were fitted with modified Dubinin-Astakhov and Tóth models. Results indicated good approximation between data points and models. The average isosteric heats of adsorption estimated using modified D-A and Tóth model were found to be 19.742 kJ mol −1 and 19.023 kJ mol −1, respectively. The obtained characteristics of composite adsorbent are prerequisites for designing compact CO2 based adsorption cooling systems. Graphical abstract: Image, graphical abstract