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Adsorption equilibrium of carbon dioxide on zeolite 13X at high pressures 3.4 MPa for about 20 pressure measurement points. Siriwardane et al. (2005) used the same method for temperatures of 303.15 K and 393.15 K and pressures up to 2.5 MPa for 12 pressure measurement points. In this paper, the adsorption equilibrium isotherms of CO2 on zeolite 13X were determined at temperatures of 293.15 K, 303.15 K, 313.15 K, 323.15 K, 333.15 K, 348.15 K, 373.15 K, 393.15 K and under pressures up to 2 MPa. The experiments were performed for 33 pressure measurement points allowing to determine the multitemperature adsorption isotherm of the studied system with high accuracy. 2. MATERIALS AND METHODS 2.1. Characteristics of adsorbent and adsorbate Experimental research concerned adsorption equilibrium of carbon dioxide onto zeolite 13X, which was manufactured by Polskie Odczynniki Chemiczne S.A. (Gliwice, Poland). Basic physical properties of the adsorbent (Fig. 1) are presented in Table 1. Fig. 1. Molecular sieves 13X Table 1. Physical properties of zeolite 13X (Nastaj, 2013) Property BET surface area, m2/g 726 bulk density, kg/m3 689 density, kg/m3 1100 bed porosity 0.374 pellet porosity 0.247 pellet diameter, m 0.0036 pore radius, nm 23 Value 2.2. Description of experimental apparatus and measurement Studies of adsorption equilibrium were performed using an Intelligent Gravimetric Analyzer (IGA-002, Hiden Isochema, United Kingdom) (Fig. 2). The main element of the IGA system is a precision balance with weighing resolution of 0.1 μg (Nastaj and Aleksandrzak, 2003). http://journals.pan.pl/dlibra/journal/98834 311PDF Image | ADSORPTION EQUILIBRIUM OF CARBON DIOXIDE ON ZEOLITE
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