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Title: Hydrogen production by the decomposition of water

A process is described for the production of hydrogen from water by a sulfuric acid process employing electrolysis and thermo-chemical decomposition. The water containing SO/sub 2/ is electrolyzed to produce H/sub 2/ at the cathode and to oxidize the SO/sub 2/ to form H/sub 2/SO/sub 4/ at the anode. After the H/sub 2/ has been separated, a compound of the type M/sub r/X/sub s/ is added to produce a water insoluble sulfate of M and a water insoluble oxide of the metal in the radical X. In the compound M/sub r/X/sub s/, M is at least one metal selected from the group consisting of Ba/sup 2 +/, Ca/sup 2 +/, Sr/sup 2 +/, La/sup 2 +/, and Pb/sup 2 +/; X is at least one radical selected from the group consisting of molybdate (MoO/sub 4//sup 2 -/), tungstate (WO/sub 4//sup 2 -/), and metaborate (BO/sub 2//sup 1 -/); and r and s are either 1, 2, or 3 depending upon the valence of M and X. The precipitated mixture is filtered and heated to a temperature sufficiently high to form SO/sub 3/ gas and to reform M/sub r/X/sub s/. The SO/sub 3/ is dissolved in a small amount of H/submore » 2/O to produce concentrated H/sub 2/SO/sub 4/, and the M/sub r/X/sub s/ is recycled to the process. Alternatively, the SO/sub 3/ gas can be recycled to the beginning of the process to provide a continuous process for the production of H/sub 2/ in which only water need be added in a substantial amount. (BLM)« less
Authors:
;
OSTI Identifier:
5325164
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; HYDROGEN PRODUCTION; ELECTROLYSIS; OXYGEN; PRODUCTION; BARIUM COMPOUNDS; BORATES; CALCIUM COMPOUNDS; LANTHANUM COMPOUNDS; LEAD COMPOUNDS; MOLYBDATES; STRONTIUM COMPOUNDS; SULFURIC ACID; TUNGSTATES; WATER; ALKALINE EARTH METAL COMPOUNDS; CRYOGENIC FLUIDS; ELEMENTS; FLUIDS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; LYSIS; MOLYBDENUM COMPOUNDS; NONMETALS; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS 080101* -- Hydrogen-- Production-- Electrolysis; 080102 -- Hydrogen-- Production-- Thermochemical Processes