Silica Gel as a Selective Adsorbent for Biogas Drying and Upgrading

Carlos A. Grande, Daniela G.B. Morence, Aud M. Bouzga, Kari Anne Andreassen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Biogas upgrading (CO2 removal) is an essential step toward the production of biomethane. Biomethane can be transported in the existing natural gas grids or used directly as a vehicular fuel with proven environmental benefits. Before or after upgrading (depending on the technology), biomethane needs to be dried to avoid corrosion issues in pipelines and storage devices. While the trend now is to evaluate advanced and eventually expensive adsorbents, we have revisited the possibility of using silica gel as a cheap material to decrease the cost of biomethane production. Silica gel does not present a very high selectivity toward CO2, but Pressure Swing Adsorption (PSA) engineers can handle the lack of selectivity by tuning the unit operation. The advantage of silica gel is that the adsorption isotherms of CO2 are not very steep. Moreover, an additional advantage is that the same adsorbent can do the drying and the upgrading steps in the same column. We have evaluated two different samples of silica gel with wide and narrow pores, and we have seen that the material with higher density and higher surface area has more potential to be used for biogas upgrading.
Original languageEnglish (US)
Pages (from-to)10142-10149
Number of pages8
JournalIndustrial and Engineering Chemistry Research
Issue number21
StatePublished - May 27 2020
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-13

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Chemistry
  • Industrial and Manufacturing Engineering


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