Work

Thermodynamic functions and parameters of sorption from flue gases (CO2,SOx,NOx) by Khekordzula clinoptilolite

Year: 2024

Type: article

Abstract: Generation during the production process and emissions into the atmosphere with flue gases (CO 2 ,SOx,NOx) cause the “greenhouse effect” and the problem of global warming. Despite the existing practice of using zeolite as an adsorbent for a number of gases in projects such as Carbon Capture, Utilization and Storage to prevent climate change, the thermodynamic functions and parameters of the zeolite tuff containing the mineral Khekordzula clinophtholite in the inner Kartli region of Georgia are unknown and have not been studied. According to the research data, the corresponding thermodynamic parameters were determined, namely the enthalpy of formation of the mineral clinophthylolite in the Khekordzula zeolite tuff Δ f H 298 0 = − 39 , 825.838 k j · m o l − 1 , Gibbs energy Δ f G 298 0 = − 36 , 734.784 k j · m o l − 1 , entropy S 298 0 = − 10.373 j · K · m o l − 1 ; Dehydration and as well as physical sorption (CO 2 , SOx, NOx) start parameters: temperature T = 352.90 K , pressure P = 6.84 m m H g . The thermodynamic parameters of the Khekordzula natural clinoptilolite tuff, taking into account its basic mineralogical composition, were determined: Δ f H 298 0 = − 30 , 403.76 k j · m o l − 1 ; Δ f G 298 0 = − 29 , 963.01 k j · m o l − 1 ; S 298 0 = − 1.48 j · K · m o l − 1 ; T = 374.22 K , P = 0.0003 m m H g . It has been confirmed that chemisorption (CO 2 , SOx, NOx) by Khekordzula clinophthylolite should begin at temperatures above 2000 K. The results of the conducted studies make it possible to evaluate the prospects of using Khekordzula and natural zeolites of similar composition as an adsorbent for harmful industrial gases, which will help plan and implement effective solutions to environmental problems.

Source: Chemical Thermodynamics and Thermal Analysis

DOI: 10.1016/j.ctta.2024.100141