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Title: Hydrogen production by the decomposition of water

How to produce hydrogen from water was a problem addressed by this invention. The solution employs a combined electrolytical-thermochemical sulfuric acid process. Additionally, high purity sulfuric acid can be produced in the process. Water and SO.sub.2 react in electrolyzer (12) so that hydrogen is produced at the cathode and sulfuric acid is produced at the anode. Then the sulfuric acid is reacted with a particular compound M.sub.r X.sub.s so as to form at least one water insoluble sulfate and at least one water insoluble oxide of molybdenum, tungsten, or boron. Water is removed by filtration; and the sulfate is decomposed in the presence of the oxide in sulfate decomposition zone (21), thus forming SO.sub.3 and reforming M.sub.r X.sub.s. The M.sub.r X.sub.s is recycled to sulfate formation zone (16). If desired, the SO.sub.3 can be decomposed to SO.sub.2 and O.sub.2 ; and the SO.sub.2 can be recycled to electrolyzer (12) to provide a cycle for producing hydrogen.
Authors:
 [1] ;  [1]
  1. (Los Alamos, NM)
Publication Date:
OSTI Identifier:
863771
Report Number(s):
US 4244794
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
hydrogen; production; decomposition; water; produce; hydrogen; water; addressed; solution; employs; combined; electrolytical-thermochemical; sulfuric; acid; process; additionally; purity; sulfuric; acid; produced; process; water; react; electrolyzer; 12; hydrogen; produced; cathode; sulfuric; acid; produced; anode; sulfuric; acid; reacted; particular; compound; form; water; insoluble; sulfate; water; insoluble; oxide; molybdenum; tungsten; boron; water; removed; filtration; sulfate; decomposed; presence; oxide; sulfate; decomposition; zone; 21; forming; reforming; recycled; sulfate; formation; zone; 16; desired; decomposed; recycled; electrolyzer; 12; provide; cycle; producing; hydrogen; produce hydrogen; sulfate formation; sulfuric acid; sulfuric acid; sulfuric acid; sulfuric acid; producing hydrogen; hydrogen production; water insoluble; water insoluble; soluble oxide /205/