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

作者：Xie, Peini; Yu, Shufan; Ouyang, Liuzhang; Zeng, Liang; Sun, Zhao; Sun, Zhiqiang^*

来源：International Journal of Hydrogen Energy, 2022, 47(21): 11164-11176.

DOI：10.1016/j.ijhydene.2022.01.164

• Formic acid
• Sorption-enhanced CO(x & nbsp
• )removal
• Sodium sorbent looping
• Hydrogen production
• Ultra-low-concentration CO

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?& nbsp;NaHCO3) formic acid dehydrogenation (SLFAD) system is proposed for high-purity hydrogen production with ultra-low CO generation via the Na2CO3?& nbsp;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 H-2. 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 hydrogenconcentration of 97.905 vol%, a minimum CO concentration of 11.97 ppm, and a high hydrogen production rate of 0.99989 kmol H-2 h(-1) can be obtained under the conditions of atmospheric pressure, FADR temperature at 80 & DEG;C, H2O/HCOOH = 1.2, CORR temperature at 80 & DEG;C, and Na2CO3/HCOOH = 1.0.

• 单位
  天津大学