Extracting high-purity hydrogen via sodium looping-based formic acid dehydrogenation

Formic acid (FA) has been considered as a prospective hydrogen carrier for its potentials to realize hydrogen storage, transportation, and in-situ supply under mild conditions. However, the application of FA dehydrogenation is limited by its unsatisfactory hydrogen concentration and carbon monoxide...

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Bibliographic Details
Published in:	International journal of hydrogen energy 2022-03, Vol.47 (21), p.11164-11176
Main Authors:	Xie, Peini, Yu, Shufan, Ouyang, Liuzhang, Zeng, Liang, Sun, Zhao, Sun, Zhiqiang
Format:	Article
Language:	eng
Subjects:	Formic acid Hydrogen production Sodium sorbent looping Sorption-enhanced COx removal Ultra-low-concentration CO
Online Access:	Get full text
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Summary:	Formic acid (FA) has been considered as a prospective hydrogen carrier for its potentials to realize hydrogen storage, transportation, and in-situ supply under mild conditions. However, the application of FA dehydrogenation is limited by its unsatisfactory hydrogen concentration and carbon monoxide selectivity. Herein, a sodium looping-based (Na2CO3↔NaHCO3) formic acid dehydrogenation (SLFAD) system is proposed for high-purity hydrogen production with ultra-low CO generation via the Na2CO3↔NaHCO3 looping. The SLFAD system consists of three parts, which are FA dehydrogenation reactor (FADR), sorption-enhanced carbon oxide removal reactor (CORR), and sodium-based sorbent regeneration reactor (SSRR). Experimental results proved that no sodium formate and sodium oxalate was formed under NaHCO3 reduction by H2. A comprehensive assessment of the system was carried out to preliminary verify the feasibility and optimize the operation parameters of the SLFAD system. Results indicated that a maximum hydrogen concentration of 97.905 vol%, a minimum CO concentration of 11.97 ppm, and a high hydrogen production rate of 0.99989 kmol H2 h−1 can be obtained under the conditions of atmospheric pressure, FADR temperature at 80 °C, H2O/HCOOH = 1.2, CORR temperature at 80 °C, and Na2CO3/HCOOH = 1.0. [Display omitted] •A sodium looping based formic acid dehydrogenation (SLFAD) concept was proposed.•A high hydrogen concentration of 97.90 vol% can be obtained at low temperatures.•Carbon monoxide concentration can be restricted to be 11.97 ppm via SLFAD process.•Sodium-based absorbent can be regenerated with the achievement of CO2 capture.
ISSN:	0360-3199 1879-3487