Carbon dioxide adsorption on zeolites and activated carbon by pressure swing adsorption

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Carbon dioxide adsorption on zeolites and activated carbon by pressure swing adsorption ( carbon-dioxide-adsorption-zeolites-and-activated-carbon-by-p )

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Int J Energy Environ Eng (2014) 5:349–356 353 Fig. 5 CO2 adsorption isotherms on zeolite 13X Table 4 Langmuir constants and their regression coefficient Material Zeolite 13X Zeolite 4A AC Temp (°C) Langmuir constant qm K R2 Dq% 0.987 6.6 0.978 9.7 0.987 8.5 0.978 10.8 0.997 5.4 0.974 12.5 0.979 7.9 0.989 9.5 0.961 9.8 0.933 8.5 0.948 12.7 0.939 10.5 25 4.245 35 3.971 45 3.521 60 3.173 25 3.263 35 3.071 45 2.921 60 2.617 25 2.828 35 2.711 45 2.591 60 2.494 19.031 16.875 13.747 11.202 19.031 16.875 13.747 11.202 21.956 19.119 15.502 11.759 Fig. 6 CO2 adsorption isotherms on zeolite 4A Table 5 Freunlich constants and their regression coefficients Material Zeolite 13X Zeolite 4A AC Freunlich constant Kn Temp (°C) 25 35 45 60 25 35 45 60 25 35 45 60 􏱉􏱉􏱉Nexp 􏱁 Ncal􏱉􏱉􏱉 h j1⁄41 􏱉 Nexp 􏱉 R2 Dq% 0.918 6.7 0.938 10.5 0.925 9.5 0.973 12.3 0.917 9.5 0.923 11.2 0.929 10.4 0.937 9.7 0.987 5.4 0.982 8.4 0.995 9.1 0.986 6.7 ð3Þ 1.122 1.034 0.952 0.836 1.122 1.034 0.952 0.836 0.505 0.447 0.383 0.346 6.127 5.483 4.594 3.812 5.025 4.386 3.891 3.311 1.701 1.551 1.387 1.319 Fig. 7 CO2 adsorption isotherm on AC Dq% 1⁄4 100 Xh The average percent deviation quantity, Dq, or the adsorbed amounts were calculated using the following formula given in Eq. 3 [28]: where h is the number of experimental data and Nexp and Ncal are the experimental and calculated number of moles that are adsorbed by the adsorbent pellet. Adsorption thermodynamics The thermodynamic parameters are calculated from the Langmuir isotherms by using the Vant’Hoff’s equation as follows in Eq. 4–6 [29]: DG􏰷 1⁄4 􏱁RT ln Kl ð4Þ 123

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