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Novel Material for the Separation of Mixtures of Carbon Dioxide and Nitrogen

Mohamed A. M. Elsayed. Novel Material for the Separation of Mixtures of Carbon Dioxide and Nitrogen. Supervisors : Prof. P. J. Hall & Dr. M. J. Heslop. Introduction. Naturally occurring carbonaceous material. Physical or chemical activation. Polymer precursor. Sol-gel process.

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Novel Material for the Separation of Mixtures of Carbon Dioxide and Nitrogen

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  1. Mohamed A. M. Elsayed Novel Material for the Separation of Mixtures of Carbon Dioxide and Nitrogen Supervisors : Prof. P. J. Hall & Dr. M. J. Heslop

  2. Introduction Naturally occurring carbonaceous material Physical or chemical activation Polymer precursor Sol-gel process POROUS CARBON Pyrolysis Fewer minerals impurities & controlled pore structure

  3. Sol-Gel Technologies and their Products

  4. OBJECTIVES First stage 1- further developing and modifying resorcinol formaldehyde sol-gel synthesis procedure to make high surface area carbon xerogels with a controlled pore structure. 2- Studying factor affecting on the texture properties and characteristics of the produced material. 3- Further chemical impregnation to produce nitrogen-enriched carbon xerogels 4 - Using different techniques for characterization and analysis (BET, TPD, FTIR, TGA, XRD, SEM, etc…) Second stage 1-Investigation of full binary isotherms for CO2 and N2 from composition and flow-rate transient times in chromatographic columns 2- Studying factor affecting on the selectivity of CO2 and N2.

  5. Experimental Drying Pyrolysis Resin synthesis RF-xerogels Carbon xerogels Co2 gasification Active carbon xerogels Carbon characterization N2 adsorption-desorption techniques

  6. Result and discussion Resin analysis Ultimate and Proximate analyses using Elemental and Thermogravimetric analyzer respectively R/F= 0.5 and R/C = 300 by mole PH=6 and R/W = 0.25 g/cm3

  7. Thermogravimetric analysis of a dried resorcinol-formaldehyde gel

  8. FTIR spectra for the synthesis resins with different type of catalytic species nitrile lactame aromatic -CH2- amides & amines -OH

  9. Carbonxerogelscharacterization by BET. Effect of changing catalyst species and the catalyst ratios. (b) MEA was used as a catalyst with different R/C ratio (a) R/C= 300 by mole with different type of catalytic species

  10. Characteristic pore properties of RF carbon xerogels a Specific surface area determined from the BET equation. bTotal pore volume. cMicropore volume determine by Horvath-Kawazoe equation. dMesopore volume . eMean pore diameter.

  11. Pore size distribution of the RF carbon xerogels (a) R/C= 300 by mole with different type of catalytic species (b) MEA was used as a catalyst with different R/C ratio R/F=0.5 by mole and R/W=0.25 g/cm3

  12. Effect of R/W on porous structure of carbon xerogels. (b) Total and micropores volume (a) BET surface area and surface area of micropores R/F=0.5, R/C= 100, PH=6 and MEA as a catalyst

  13. Effect of pH on the on porous structure of carbon xerogels (b) Total and micropores volume (a) BET surface area and surface area of micropores R/F=0.5 R/C=100 by mole, R/W=0.25 g/cm3 and MEA as a catalyst.

  14. Effect of degree of Burn-off. Variation of the BET surface area, pore volume and micropore volume with the burn off level of carbon xerogels gasified in CO2 at 900°C R/F=0.5 R/C=100 by mole, R/W=0.25 g/cm3 and MEA as a catalyst.

  15. (a) (b) ( c ) (d) Structural characterization with scanning electron microscopyanalysis. SEM images of cross-section of (a) and (b) samples synthesized under condition pH=6, R/C=300 and R/W=0.25 before and after pyrolysis respectively (c) and (d) carbon xerogels synthesized under condition pH=6, R/C=100 and R/W=0.25 with 0 % and 37% burn-off respectively. (All the samples were prepared using MEA as catalyst)

  16. Conclusion Microporous carbons with high porosity and surface area can be prepared from Resorcinol-Formaldehyde resins The samples evolve from micro-mesoporous solid (RF-Na2CO3: combination of types I and IV isotherms) with 24.2% micropore to an exclusively microporous material (RF-NH4HCO3: type I isotherm) with 98.7% micropore. High surface area (> 2890 m2/g) can be obtained at high burn off levels (>75%). It is possible to tailor the morphology of these materials by varying the initial pH of the precursor’s solution in a narrow range FTIR study shows that samples prepared by MEA, DEA, MDEA and NH4HCO3 contain nitrogenated functional groups These porous materials with these functional groups are being expected as suitable candidates for acidic gas capture like CO2 and SO2, which will be studied in the next stage.

  17. Thank-You & Questions

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