Automatic high-pressure H2 generation up to 40 MPa through HCO3−/CO32− enhanced Al–H2O reaction. (15th May 2022)

• Record Type: Journal Article
• Authors: Wang, Zhiyou; Pei, Yuhou; Zhong, Heng; Jin, Fangming
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 42(2022)
• Page Start: 18240
• Page End: 18250
• Publication Date: 2022-05-15
• Subjects: Hydrogen energy -- Aluminum -- High-pressure hydrogen -- Hydrogen compressing -- Metal-water reaction -- Bicarbonate; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.04.027
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: For the practical application, storage, and transportation of hydrogen energy, compressed high-pressure H2 is generally required, which consumes large amounts of energy. In this research, an automatic high-pressure H2 production system based on the HCO3 − enhanced Al–H2 O reaction is established, in which, over 40 MPa H2 at 300 °C (25 MPa at 25 °C) is successfully obtained without using any compressing facilities. Energy balance calculation reveals that although this reaction requires a high temperature, it is highly exothermic (145.9 MJ/kg H2 ). Since heating the reactants to the desired reaction temperature only needs an energy of 55.3 MJ/kg H2, the energy requirement of this reaction can be self-supported. In addition, waste Al-can is further tested for the high-pressure H2 generation to realize a waste material recovery simultaneously, and over 40 MPa H2 at 300 °C can also be obtained with the addition of Na2 CO3 . This research proposes a new way of automatic high-pressure H2 production from renewable resources, which can promote the practical large-scale hydrogen energy utilization. Graphical abstract: Image 1 Highlights: Automatic high-pressure H2 generation from Al–H2 O reaction is proposed. H2 pressure over 40 MPa at 300 °C and 25 MPa at 25 °C is obtained. Mild HCO 3 − alkaline buffer is used to activate the Al and to protect the reactor. The automatic high-pressure H2 generation reaction can be self-supported.