Abstract
This paper proposes an environment-friendly method to load ferrous ion (Fe2+) to lignite with water, iron metal and carbon dioxide (CO2) but without mineral acids or iron salts containing potentially harmful components. Iron metal was dissolved into 25°C water that had been saturated with CO2 at its gaseous pressure of 4.0 MPa. The solubility of ferrous iron was 1 070 mg-Fe/L-water. This solubility was much higher than that predicted from the solubility product (Ksp) of FeCO3 with an assumption that Fe2+ represented the dissolved ferrous iron. Rather, another assumption of coexistence of Fe2+, FeHCO3+, and Fe(HCO3)2 reasonably explained the measured solubility of ferrous iron. The dissolved ferrous iron was loaded to a Victorian lignite by ion exchange. The iron-loaded lignites with different iron concentrations (0.3-6.7 wt %-dry-lignite) were subjected to a sequence of pyrolysis and steam gasification to produce synthesis gas in a thermogravimetric analyzer. The gasification was catalyzed by the loaded iron regardless of its concentration, while the quickest at 1.0 wt % where dispersion of iron-derived catalytic species in the char matrix was maintained until its complete gasification with steam.
| Original language | English |
|---|---|
| Pages (from-to) | 5623-5631 |
| Number of pages | 9 |
| Journal | Energy and Fuels |
| Volume | 28 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 18 2014 |
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All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
Cite this
Preparation and steam gasification of Fe-Ion exchanged lignite prepared with iron metal, water, and pressurized CO2. / Kim, Hyun Seok; Kudo, Shinji; Norinaga, Koyo; Jun-Ichiro, Hayashi.
In: Energy and Fuels, Vol. 28, No. 9, 18.09.2014, p. 5623-5631.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Preparation and steam gasification of Fe-Ion exchanged lignite prepared with iron metal, water, and pressurized CO2
AU - Kim, Hyun Seok
AU - Kudo, Shinji
AU - Norinaga, Koyo
AU - Jun-Ichiro, Hayashi
PY - 2014/9/18
Y1 - 2014/9/18
N2 - This paper proposes an environment-friendly method to load ferrous ion (Fe2+) to lignite with water, iron metal and carbon dioxide (CO2) but without mineral acids or iron salts containing potentially harmful components. Iron metal was dissolved into 25°C water that had been saturated with CO2 at its gaseous pressure of 4.0 MPa. The solubility of ferrous iron was 1 070 mg-Fe/L-water. This solubility was much higher than that predicted from the solubility product (Ksp) of FeCO3 with an assumption that Fe2+ represented the dissolved ferrous iron. Rather, another assumption of coexistence of Fe2+, FeHCO3+, and Fe(HCO3)2 reasonably explained the measured solubility of ferrous iron. The dissolved ferrous iron was loaded to a Victorian lignite by ion exchange. The iron-loaded lignites with different iron concentrations (0.3-6.7 wt %-dry-lignite) were subjected to a sequence of pyrolysis and steam gasification to produce synthesis gas in a thermogravimetric analyzer. The gasification was catalyzed by the loaded iron regardless of its concentration, while the quickest at 1.0 wt % where dispersion of iron-derived catalytic species in the char matrix was maintained until its complete gasification with steam.
AB - This paper proposes an environment-friendly method to load ferrous ion (Fe2+) to lignite with water, iron metal and carbon dioxide (CO2) but without mineral acids or iron salts containing potentially harmful components. Iron metal was dissolved into 25°C water that had been saturated with CO2 at its gaseous pressure of 4.0 MPa. The solubility of ferrous iron was 1 070 mg-Fe/L-water. This solubility was much higher than that predicted from the solubility product (Ksp) of FeCO3 with an assumption that Fe2+ represented the dissolved ferrous iron. Rather, another assumption of coexistence of Fe2+, FeHCO3+, and Fe(HCO3)2 reasonably explained the measured solubility of ferrous iron. The dissolved ferrous iron was loaded to a Victorian lignite by ion exchange. The iron-loaded lignites with different iron concentrations (0.3-6.7 wt %-dry-lignite) were subjected to a sequence of pyrolysis and steam gasification to produce synthesis gas in a thermogravimetric analyzer. The gasification was catalyzed by the loaded iron regardless of its concentration, while the quickest at 1.0 wt % where dispersion of iron-derived catalytic species in the char matrix was maintained until its complete gasification with steam.
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U2 - 10.1021/ef5010418
DO - 10.1021/ef5010418
M3 - Article
VL - 28
SP - 5623
EP - 5631
JO - Energy & Fuels
JF - Energy & Fuels
SN - 0887-0624
IS - 9
ER -