Decomposition of hydrogen bromide using iron bromide and magnetite
A means of thermochemically decomposing hydrogen bromide has been investigated experimentally using the reaction between magnetite and HBr as the bromine producing step. A high yield of Br/sub 2/ was formed in a short time (90% in 0.5 h). For the hydrogen producing step, the direct hydrolysis of ferrous bromide was confirmed as having an unfavorable equilibrium (3.61 x 10/sup -3/ at 849/sup 0/K). However, introduction of magnesium oxide into an aqueous solution of FeBr/sub 2/ and subsequent heating of the insoluble product gave H/sub 2/ and Fe/sub 3/O/sub 4/ in good yields. Further, Br/sub 2/ could be regenerated from this Fe/sub 3/O/sub 4/ by treatment with HBr. All the reactions were demonstrated to be fast, going to about 85% completion. The main drawback is the heat required to dry and dehydrate magnesium bromide in order to reform MgO by hydrolysis. These reactions are discussed within the framework of a thermochemical cycle.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6748623
- Report Number(s):
- LA-UR-78-847; CONF-780807-4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Gas phase photolysis of ethyl bromide at 253. 7 nm
Organometallic catalysis in aqueous solution. Oxygen transfer to bromide
Related Subjects
080102* -- Hydrogen-- Production-- Thermochemical Processes
ALKALINE EARTH METAL COMPOUNDS
BROMIDES
BROMINE
BROMINE COMPOUNDS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HYDROBROMIC ACID
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
HYDROLYSIS
INORGANIC ACIDS
IRON BROMIDES
IRON COMPOUNDS
IRON ORES
IRON OXIDES
LYSIS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETITE
MINERALS
NONMETALS
ORES
OXIDES
OXYGEN COMPOUNDS
SOLVOLYSIS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS