Selective separation of CO2 and CH4 for biogas upgrading on zeolite NaKA and SAPO-56

Zoltán Bacsik; Ocean Cheung; Petr Vasiliev; Niklas Hedin

doi:10.1016/j.apenergy.2015.10.109

Selective separation of CO₂ and CH₄ for biogas upgrading on zeolite NaKA and SAPO-56

Zoltán Bacsik, Ocean Cheung, Petr Vasiliev, Niklas Hedin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

113 Citations (Scopus)

Abstract

Several commercial and potential adsorbents were investigated for the separation of CO₂ from CH₄, which is relevant for the upgrading of raw biogas. The main focus of the paper was on the working capacities and selectivities of the adsorbents for a generic vacuum swing adsorption (VSA) process. Zeolites 4A and 13X had good estimated CO₂-over-CH₄ selectivities and reasonably high working capacities for the removal of CO₂. A variant of zeolite A - |Na₁₂ _- _xK_x|-LTA (with 1.8≤x≤3.2), had at least the same working capacity as zeolite 4A but with a significantly improved selectivity. Hence, the environmentally important "CH₄ slip" can be minimized with this |Na₁₂ _- _xK_x|-LTA sorbent. If a high working capacity for CO₂ removal is the most important characteristic for a VSA process, then silicoaluminum phosphate, specifically SAPO-56, appeared to be the best candidate among the studied sorbents. In addition, SAPO-56 had a substantially high estimated CO₂-over-CH₄ selectivity with a value between ~20 and 30.

Original language	English
Pages (from-to)	613-621
Number of pages	9
Journal	Applied Energy
Volume	162
DOIs	https://doi.org/10.1016/j.apenergy.2015.10.109
Publication status	Published - 15 Jan 2016

Keywords

Biogas upgrading
Carbon dioxide/methane separation
CH adsorption
CO adsorption
SAPO-56
Zeolite NaKA

ASJC Scopus subject areas

General Energy
Civil and Structural Engineering

Access to Document

10.1016/j.apenergy.2015.10.109

Cite this

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title = "Selective separation of CO2 and CH4 for biogas upgrading on zeolite NaKA and SAPO-56",

abstract = "Several commercial and potential adsorbents were investigated for the separation of CO2 from CH4, which is relevant for the upgrading of raw biogas. The main focus of the paper was on the working capacities and selectivities of the adsorbents for a generic vacuum swing adsorption (VSA) process. Zeolites 4A and 13X had good estimated CO2-over-CH4 selectivities and reasonably high working capacities for the removal of CO2. A variant of zeolite A - |Na12 - xKx|-LTA (with 1.8≤x≤3.2), had at least the same working capacity as zeolite 4A but with a significantly improved selectivity. Hence, the environmentally important {"}CH4 slip{"} can be minimized with this |Na12 - xKx|-LTA sorbent. If a high working capacity for CO2 removal is the most important characteristic for a VSA process, then silicoaluminum phosphate, specifically SAPO-56, appeared to be the best candidate among the studied sorbents. In addition, SAPO-56 had a substantially high estimated CO2-over-CH4 selectivity with a value between ~20 and 30.",

keywords = "Biogas upgrading, Carbon dioxide/methane separation, CH adsorption, CO adsorption, SAPO-56, Zeolite NaKA",

author = "Zolt{\'a}n Bacsik and Ocean Cheung and Petr Vasiliev and Niklas Hedin",

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AU - Bacsik, Zoltán

AU - Cheung, Ocean

AU - Vasiliev, Petr

AU - Hedin, Niklas

PY - 2016/1/15

Y1 - 2016/1/15

N2 - Several commercial and potential adsorbents were investigated for the separation of CO2 from CH4, which is relevant for the upgrading of raw biogas. The main focus of the paper was on the working capacities and selectivities of the adsorbents for a generic vacuum swing adsorption (VSA) process. Zeolites 4A and 13X had good estimated CO2-over-CH4 selectivities and reasonably high working capacities for the removal of CO2. A variant of zeolite A - |Na12 - xKx|-LTA (with 1.8≤x≤3.2), had at least the same working capacity as zeolite 4A but with a significantly improved selectivity. Hence, the environmentally important "CH4 slip" can be minimized with this |Na12 - xKx|-LTA sorbent. If a high working capacity for CO2 removal is the most important characteristic for a VSA process, then silicoaluminum phosphate, specifically SAPO-56, appeared to be the best candidate among the studied sorbents. In addition, SAPO-56 had a substantially high estimated CO2-over-CH4 selectivity with a value between ~20 and 30.

AB - Several commercial and potential adsorbents were investigated for the separation of CO2 from CH4, which is relevant for the upgrading of raw biogas. The main focus of the paper was on the working capacities and selectivities of the adsorbents for a generic vacuum swing adsorption (VSA) process. Zeolites 4A and 13X had good estimated CO2-over-CH4 selectivities and reasonably high working capacities for the removal of CO2. A variant of zeolite A - |Na12 - xKx|-LTA (with 1.8≤x≤3.2), had at least the same working capacity as zeolite 4A but with a significantly improved selectivity. Hence, the environmentally important "CH4 slip" can be minimized with this |Na12 - xKx|-LTA sorbent. If a high working capacity for CO2 removal is the most important characteristic for a VSA process, then silicoaluminum phosphate, specifically SAPO-56, appeared to be the best candidate among the studied sorbents. In addition, SAPO-56 had a substantially high estimated CO2-over-CH4 selectivity with a value between ~20 and 30.

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