Abstract
The rising concentration of CO2, emitted into the atmosphere from power plant flue gas, is a major contributor to global warming. Silica gel is an important adsorbent to dry wet flue gas prior to sending the dried gas (CO2/N2 mixture) for carbon capture. In the present work, a comprehensive experimental and simulation study is undertaken to establish the adsorption and diffusion of N2 and CO2 and their mixture on silica gel at pressures and temperatures relevant to vacuum swing adsorption (VSA) processes. The adsorption equilibrium of pure N2 and CO2 is captured well by the single component Langmuir isotherm model. Carefully designed controlled experiments are conducted to show that the transport mechanism for the adsorption of pure N2 in silica gel pores is governed by Knudsen flow, while for CO2, it is a combination of Knudsen and surface flow. Binary mixture experiments are performed to confirm the mixture equilibrium and kinetic models necessary to simulate the dry product end of a column in a VSA process for drying wet flue gas. For binary mixture equilibrium of these gases, there is no effect of competition from the other gas present in the mixture, implying that they exhibit noncompetitive adsorption on silica gel. Transport of CO2/N2 mixture in silica gel pores is well captured by the mechanism established from the single component study. ©
| Original language | English |
|---|---|
| Pages (from-to) | 19611-19622 |
| Journal | Industrial and Engineering Chemistry Research |
| Volume | 58 |
| Issue number | 42 |
| DOIs | |
| Publication status | E-pub ahead of print - 9 Oct 2019 |
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Adsorption and Diffusion of N2 and CO2 and Their Mixture on Silica Gel. / Goyal, Prerna; Purdue, Mark J.; Farooq, Shamsuzzaman.
In: Industrial and Engineering Chemistry Research, Vol. 58, No. 42, 09.10.2019, p. 19611-19622.Research output: Contribution to journal › Article
TY - JOUR
T1 - Adsorption and Diffusion of N2 and CO2 and Their Mixture on Silica Gel
AU - Goyal, Prerna
AU - Purdue, Mark J.
AU - Farooq, Shamsuzzaman
PY - 2019/10/9
Y1 - 2019/10/9
N2 - The rising concentration of CO2, emitted into the atmosphere from power plant flue gas, is a major contributor to global warming. Silica gel is an important adsorbent to dry wet flue gas prior to sending the dried gas (CO2/N2 mixture) for carbon capture. In the present work, a comprehensive experimental and simulation study is undertaken to establish the adsorption and diffusion of N2 and CO2 and their mixture on silica gel at pressures and temperatures relevant to vacuum swing adsorption (VSA) processes. The adsorption equilibrium of pure N2 and CO2 is captured well by the single component Langmuir isotherm model. Carefully designed controlled experiments are conducted to show that the transport mechanism for the adsorption of pure N2 in silica gel pores is governed by Knudsen flow, while for CO2, it is a combination of Knudsen and surface flow. Binary mixture experiments are performed to confirm the mixture equilibrium and kinetic models necessary to simulate the dry product end of a column in a VSA process for drying wet flue gas. For binary mixture equilibrium of these gases, there is no effect of competition from the other gas present in the mixture, implying that they exhibit noncompetitive adsorption on silica gel. Transport of CO2/N2 mixture in silica gel pores is well captured by the mechanism established from the single component study. ©
AB - The rising concentration of CO2, emitted into the atmosphere from power plant flue gas, is a major contributor to global warming. Silica gel is an important adsorbent to dry wet flue gas prior to sending the dried gas (CO2/N2 mixture) for carbon capture. In the present work, a comprehensive experimental and simulation study is undertaken to establish the adsorption and diffusion of N2 and CO2 and their mixture on silica gel at pressures and temperatures relevant to vacuum swing adsorption (VSA) processes. The adsorption equilibrium of pure N2 and CO2 is captured well by the single component Langmuir isotherm model. Carefully designed controlled experiments are conducted to show that the transport mechanism for the adsorption of pure N2 in silica gel pores is governed by Knudsen flow, while for CO2, it is a combination of Knudsen and surface flow. Binary mixture experiments are performed to confirm the mixture equilibrium and kinetic models necessary to simulate the dry product end of a column in a VSA process for drying wet flue gas. For binary mixture equilibrium of these gases, there is no effect of competition from the other gas present in the mixture, implying that they exhibit noncompetitive adsorption on silica gel. Transport of CO2/N2 mixture in silica gel pores is well captured by the mechanism established from the single component study. ©
UR - http://www.scopus.com/inward/record.url?scp=85073118698&partnerID=8YFLogxK
U2 - 10.1021/acs.iecr.9b02685
DO - 10.1021/acs.iecr.9b02685
M3 - Article
VL - 58
SP - 19611
EP - 19622
JO - INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
JF - INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
SN - 0888-5885
IS - 42
ER -