MMIJ 2020,Sendai

Presentation information (2020/08/07 Ver.)

Special Session

ゼロエミッション社会構築にむけたCCS/CCUS技術開発

Tue. Sep 8, 2020 1:00 PM - 5:25 PM Room-1

The chairman: Yuichi SUGAI (Kyushu University), Shinsuke NAKAO (National Institute of Advanced Industrial Science and Technology), Takashi FUJII (National Institute of Advanced Industrial Science and Technology)

5:05 PM - 5:25 PM

[1K0101-10-10] Hydrogen production with CO2 utilization and storage through hydrothermal alteration of peridotite

○Jiajie Wang1, Noriaki Watanabe1, Atsushi Okamoto1, Kengo Nakamura1, Komai Takeshi1 (1. Tohoku University)

The chairman: Takashi FUJII (National Institute of Advanced Industrial Science and Technology)

Keywords:Carbon storage, Hydrogen production, Peridotite, CCUS, Hydrothermal

Carbon dioxide (CO2) storage and hydrogen (H2) energy replacement of fossil fuel have been regarded as promising ways to develop a sustainable low-carbon society. However, the existing CO2 storage technologies are unprofitable and H2 production processes usually emit CO2. Thus, our research group tried to develop a new system to combine CO2 storage with H2 production by using Fe(II)-bearing ultramafic rocks.
Peridotite was selected for experiments in this study, it is the dominant rock of mantle and abundant on the Earth’s surface, which consists mainly of olivine [(Mg,Fe)2SiO4]. In our study, the hydrothermal alteration of peridotite under CO2-rich conditions was found not only to produce H2 by the oxidation of Fe(II) in it but also to simultaneously store CO2 by cations carbonation. With the use of a CO2-rich solution (e.g., 0.5 mol/L HCO3-) at a moderate temperature (250-300 °C), the rate of H2 production during peridotite hydration can be drastically enhanced. The CO2 after being utilized to promote H2 production was stored in magnesite [(Mg,Fe)CO3] or reduced to formic acid (HCOOH).
Our research group has successfully controlled the behaviors of Fe(II) and Mg during H2O-peridotite-CO2 reactions by varying reaction conditions for H2 production and CO2 storage, respectively, on lab-scale. The mechanisms and thermodynamics of H2O-peridotite-CO2 reactions in different environments were also revealed. Based on experimental results, possible large-scale systems were proposed with the efficient utilization of geothermal or industrial wasted heat.
This study proposed a new H2 production with CO2 storage system based on natural phenomena. It has a potential contribution to sustainable low-carbon society development by providing an environmentally friendly avenue for large scale H2 production with considerable CO2 utilization and storage.

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