Ethylene glycol as an alternative solvent approach for very efficient hydrogen production from sodium borohydride with phosphoric acid and acetic acid catalysts. (1st March 2022)

• Record Type: Journal Article
• Authors: Saka, Cafer; Balbay, Asım
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 19(2022)
• Page Start: 10500
• Page End: 10507
• Publication Date: 2022-03-01
• Subjects: Sodium borohydride -- Ethylene glycolysis -- Phosphoric acid -- Acetic acid -- Hydrogen; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.01.131
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: For the first time, phosphoric acid (H3 PO4 ) and acetic acid (CH3 COOH) catalysts were used for efficient hydrogen (H2 ) production from sodium borohydride (NaBH4 ) ethylene glycolysis reaction. In this experimental study, the effects of ethylene glycol/water ratio, ethylene glycol/acid ratio, NaBH4 concentration, acid concentration, and temperature were investigated. These ethylene glycol/water ratio experiments showed that the use of water alongside ethylene glycol negatively affects H2 production. The hydrogen generation rate (HGR) values obtained for this ethylene glycolysis reaction with 1 M H3 PO4 and 1 M CH3 COOH catalysts are 5800 and 4542 mLmin -1, respectively. Also, the completion times of ethylene glycolysis reactions with these acids are 8 and 10 s, respectively. The n value obtained for ethylene glycolysis reactions according to the power-law kinetic model was 0.50. The activation energies obtained with H3 PO4 and CH3 COOH catalysts were 24.45 kJ mol −1 and 33.23 kJ mol −1, respectively. Highlights: H3 PO4 and CH3 COOH were used for H2 production from ethylene glycolysis of NaBH4. HGR value obtained for the ethylene glycolysis reaction with 1 M H3 PO4 is 5800 mLmin -1 . HGR value for the ethylene glycolysis reaction with 1 M CH3 COOH is 4542 mLmin -1 . The activation energies with H3 PO4 and CH3 COOH were 24.45 kJ mol −1 and 33.23 kJ mol −1 .