TY - JOUR
T1 - Enhanced hydrogen production with carbon storage by olivine alteration in CO 2 -rich hydrothermal environments
AU - Wang, Jiajie
AU - Watanabe, Noriaki
AU - Okamoto, Atsushi
AU - Nakamura, Kengo
AU - Komai, Takeshi
N1 - Funding Information:
The authors thank Ryosuke Oyanagi for giving suggestions on TG analysis operation and analysis of the results. The authors also thank reviewers who gave helpful suggestions. This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number JP18J12695 .
Publisher Copyright:
© 2019 Elsevier Ltd. All rights reserved.
PY - 2019/3
Y1 - 2019/3
N2 - Here we report a novel experimental study on simultaneous hydrogen (H 2 ) production and CO 2 storage. A high concentration of NaHCO 3 (source of CO 2 ) is utilized to promote H 2 generation from olivine (Mg,Fe) 2 SiO 4 ) hydration, and then CO 2 is reduced to formic acid (HCOOH) or sequestrated in magnesite (MgCO 3 ) in a hydrothermal system. The effects of NaHCO 3 concentration (0-1.0 mol/L) and initial pH (8-11) on H 2 production and CO 2 storage were experimentally lab-scale tested at 300 °C. Both reaction pathways and reaction rates changed with variation of the reaction conditions. Under CO 2 -rich conditions, olivine consumption was promoted with the absence of Fe(II)-bearing brucite (Mg,Fe(OH) 2 ), by which more Mg and Fe ions were released. Thus, the production of H 2 and carbonation processes were significantly accelerated. The highest H 2 generation rate reached 3.13 mmol/kg olivine ·h, which is more than 15 times higher than previously reported. The HCOOH yield was 129.1 mmol/kg olivine and magnesite ((Mg,Fe)CO 3 ) generation reached a maximum of 19.2 wt% in 72 h. The enhancement of H 2 production at lower pH is primarily attributed to the presence of HCO 3 - , rather than the pH changes caused by NaHCO 3 addition. The system proposed here has significant potential to be applied at the field-scale.
AB - Here we report a novel experimental study on simultaneous hydrogen (H 2 ) production and CO 2 storage. A high concentration of NaHCO 3 (source of CO 2 ) is utilized to promote H 2 generation from olivine (Mg,Fe) 2 SiO 4 ) hydration, and then CO 2 is reduced to formic acid (HCOOH) or sequestrated in magnesite (MgCO 3 ) in a hydrothermal system. The effects of NaHCO 3 concentration (0-1.0 mol/L) and initial pH (8-11) on H 2 production and CO 2 storage were experimentally lab-scale tested at 300 °C. Both reaction pathways and reaction rates changed with variation of the reaction conditions. Under CO 2 -rich conditions, olivine consumption was promoted with the absence of Fe(II)-bearing brucite (Mg,Fe(OH) 2 ), by which more Mg and Fe ions were released. Thus, the production of H 2 and carbonation processes were significantly accelerated. The highest H 2 generation rate reached 3.13 mmol/kg olivine ·h, which is more than 15 times higher than previously reported. The HCOOH yield was 129.1 mmol/kg olivine and magnesite ((Mg,Fe)CO 3 ) generation reached a maximum of 19.2 wt% in 72 h. The enhancement of H 2 production at lower pH is primarily attributed to the presence of HCO 3 - , rather than the pH changes caused by NaHCO 3 addition. The system proposed here has significant potential to be applied at the field-scale.
KW - CO -rich
KW - CO reduction
KW - H production
KW - Hydrothermal
KW - Olivine alteration
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U2 - 10.1016/j.jcou.2019.02.008
DO - 10.1016/j.jcou.2019.02.008
M3 - Article
AN - SCOPUS:85062172842
VL - 30
SP - 205
EP - 213
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
SN - 2212-9820
ER -
