Abstract
Carbon capture by physical adsorption can strongly participate in the reduction of the carbon dioxide emissions from the flue gases with minimum energy penalties. In this paper, we report the experimental data for enhancing the adsorption separation capability of zeolite 13X incorporated with carbon nanotubes (CNT). Six samples (13X, XC1, XC2, XC3, XC4, and XC5) have been characterized by XRD. Equilibrium adsorption isotherms and actual dynamic behavior of adsorption breakthrough tests were conducted. XRD analyses show that all the samples have almost identical XRD patterns to pure 13X, while the equilibrium isotherms indicate that XC3 (0.5 wt% CNT/13X) has CO2 adsorbed amounts much closer to those of pristine 13X. Interesting results of actual capturing behavior were exposed during the breakthrough tests which confirm that the optimal adsorption separation is associated with XC3 with an increased adsorption capacity and separation breakpoint by about 21.4 and 25.3%, respectively, in comparison to pure 13X.
Highlights
The greenhouse gases, including those emitted from combustion and industrial processes, such as carbon dioxide, nitrogen oxide, and methane, lead significantly to global warming, shore floods, atmospheric heat waves, land droughts, and destruction of cold-marine life
We report the experimental data for enhancing the adsorption separation capability of zeolite 13X incorporated with carbon nanotubes (CNT)
Interesting results of actual capturing behavior were exposed during the breakthrough tests which confirm that the optimal adsorption separation is associated with XC3 with an increased adsorption capacity and separation breakpoint by about 21.4 and 25.3%, respectively, in comparison to pure 13X
Summary
The greenhouse gases, including those emitted from combustion and industrial processes, such as carbon dioxide, nitrogen oxide, and methane, lead significantly to global warming, shore floods, atmospheric heat waves, land droughts, and destruction of cold-marine life. The present research work aims at investigating the effect of physical mixing of 13X within small quantities of carbon nanotubes (less than 1.5 wt%), aiming at improving the thermal properties of adsorbent (e.g., thermal conductivity and heat capacity), with the end goal is to enhance the carbon dioxide adsorption capacity and separation behavior. To achieve this goal, experimental work, including measurement of equilibrium adsorption isotherms and XRD characterization of all samples, is required. The breakthrough separation tests are performed for determining the actual behavior of binary mixture of CO2 and N2 (20% v/v. and 80% v/v.) and for quantifying the level of improvements on CO2 separation and capacity
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