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Title

KINETIC MODELING OF CO2 CAPTURE ON MODIFIED SILICA BASED ADSORBENTS

Pages

 Start Page | End Page

Keywords

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Abstract

 ADSORPTION, ALBEIT NOT YET COMMERCIALIZED IS A PROMISING TECHNOLOGY MAY BE UTILIZED TO CAPTURE SOME ANTHROPOGENIC GREENHOUSE GASES LIKE CO2. IN SUCH A METHOD IN ADDITION TO THE ADSORPTION CAPACITY, ADSORPTION KINETICS IS THE OTHER KEY FEATURE THAT CHARACTERIZES AN IDEAL ADSORBENT [1, 2].SAYARI ET AL. STUDIED THE ADSORPTIVE PROPERTIES OF AMINE GRAFTED MESOPOROUS SILICA SORBENTS AND INDICATED GENERAL KINETIC MODEL DEVELOPED BASED ON AVRAMI’S KINETIC MODEL WAS IN A GOOD AGREEMENT WITH EXPERIMENTAL DATA [3].IN THIS STUDY THE ADSORPTION KINETICS OF CO2 ON FUNCTIONALIZED SBA-15 WITH AMINES (MONO-, DI-, AND TRI-AMINOSILANES) AS CHEMICAL ADSORBENTS WAS INVESTIGATED. THE RESULTS SHOWED THAT EXPERIMENTAL DATA OF CO2 UPTAKE AS A FUNCTION OF TIME AT 70 °C WERE IN A GOOD AGREEMENT WITH SOME KINETIC MODELS INCLUDING LAGERGEN’S PSEUDO-FIRST AND PSEUDO-SECOND ORDER AND AVRAMI’S KINETIC MODELS.FOR ALL SAMPLES, AVRAMI MODEL WITH ORDERS OF 1.4, 1.6, 1.6 AND 1.5 SUCCESSFULLY APPLIED FOR EXPLANATION OF EXPERIMENTAL DATA OBTAINED FROM SBA-15, 5%N1-S, 5%N2-S AND 5%N3-S RESPECTIVELY. THIS CAN BE ATTRIBUTED TO THE ABILITY OF AVRAMI’S MODEL TO DESCRIBE COMPLEX ADSORPTION MECHANISMS AS A RESULT OF ITS FRACTIONAL ORDER. ALSO THE RESULTS SHOWED PSEUDO-FIRST MODEL DESCRIBES THE KINETICS OF ADSORPTION MORE ACCURATE THAN PSEUDO-SECOND MODEL FOR CONSIDERED ADSORBENTS.

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