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Adsorption

, Volume 19, Issue 1, pp 49–61 | Cite as

Preparation and characterization of double metal-silica sorbent for gas filtration

  • Ebenezer Twumasi Afriyie
  • Peter Norberg
  • Christer Sjöström
  • Mikael Forslund
Article

Abstract

This paper presents the preparation of a porous (Mg, Ca) silicate structure, which could be employed as sorbent filter media. The sorbents have been prepared using sodium silicate precipitated with various ratios of magnesium and calcium salts. The sorbents obtained were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD) and nitrogen physisorption isotherm. Further, the applicability and performance of the sorbent impregnate with potassium hydroxide for removal of sulphur dioxide (SO2) has been demonstrated. From the isotherms, specific surface area, pore diameter and volume of pores were estimated. Results show that the chemical composition and textural properties of the resultant sorbents were highly dependent on Mg/Ca molar ratio. It was found that sorbents made with 68 mol% Mg and 32 mol% Ca (PSS-MgCa-68/32); and 75 mol% Mg and 25 mol% Ca (PSS-MgCa-75/25) exhibited even higher specific surface area and pore volume than the sorbents containing a single metal. The Mg/Ca-silica sorbents obtained contains interconnected bimodal porosity with large portions being mesopores of varied sizes. The pore size distribution (PSD) results further indicate that PSS-MgCa-68/32 sorbent exhibits wide PSD of interconnected pores in the size range of 1 to 32 nm while PSS-MgCa-50/50 and PSS-MgCa-75/25 exhibits narrow PSD of 1 to 5 nm. Using SO2 as model contaminate gas, it was shown that the dynamic adsorption performance of the PSS-MgCa-sorbents impregnated with 8 wt% KOH exhibits SO2 uptake, with impregnated PSS-MgCa-68/32 showing better performance. This shows that the materials prepared can be used as adsorbent for gas filtration.

Keywords

Mg/Ca-silica sorbent Gas filtration Characterization Textural properties Impregnate Mg/Ca-silica sorbents 

Abbreviations

dmes

maximum mesopores size distribution

dmic

maximum micropores size distribution

NLDFT

Nonlocal Density Functional Theory

p/p

Relative pressure

PSD

Pore Size Distribution

SBET

Specific Surface area obtained via Brunauer-Emmet-Teller-equation

Smes

Mesoporous surface area obtained via t-plot

Smic

Micropore surface area obtained via t-plot

Vmes

Mesoporous pore volume obtained via t-plot

Vmic

Microporous pore volume obtained via t-plot

Vtot

Total pore volume

XRD

X-Ray-Diffraction

Notes

Acknowledgements

We are grateful to Svenska Aerogel AB for providing the sorbents used in this study and to Ann-Charlotte at Camfil AB for performing the challenge measurements. We are also grateful to Dr. Alfonso E. Garcia-Bennet and Dr. Rambabu Atluri at the Ångström Laboratory, Uppsala University for providing the adsorption instrument and for the open research atmosphere and fruitful discussions.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Ebenezer Twumasi Afriyie
    • 1
  • Peter Norberg
    • 1
  • Christer Sjöström
    • 1
  • Mikael Forslund
    • 1
  1. 1.Materials Technology, KTH Research SchoolUniversity of GävleGävleSweden

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