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Title: Process for photosynthetically splitting water

Abstract

The invention is an improved process for producing gaseous hydrogen and oxygen from water. The process is conducted in a photolytic reactor which contains a water-suspension of a photoactive material containing a hydrogen-liberating catalyst. The reactor also includes a volume for receiving gaseous hydrogen and oxygen evolved from the liquid phase. To avoid oxygen-inactivation of the catalyst, the reactor is evacuated continuously by an external pump which circulates the evolved gases through means for selectively recovering hydrogen therefrom. The pump also cools the reactor by evaporating water from the liquid phase. Preferably, product recovery is effected by selectively diffusing the hydrogen through a heated semipermeable membrane, while maintaining across the membrane a magnetic field gradient which biases the oxygen away from the heated membrane. This promotes separation, minimizes the back-reaction of hydrogen and oxygen, and protects the membrane.

Inventors:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
865188
Patent Number(s):
4476105
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; photosynthetically; splitting; water; improved; producing; gaseous; hydrogen; oxygen; conducted; photolytic; reactor; contains; water-suspension; photoactive; material; containing; hydrogen-liberating; catalyst; volume; receiving; evolved; liquid; phase; avoid; oxygen-inactivation; evacuated; continuously; external; pump; circulates; gases; means; selectively; recovering; therefrom; cools; evaporating; preferably; product; recovery; effected; diffusing; heated; semipermeable; membrane; maintaining; magnetic; field; gradient; biases; promotes; separation; minimizes; back-reaction; protects; field gradient; semipermeable membrane; gaseous hydrogen; permeable membrane; improved process; active material; magnetic field; liquid phase; material containing; recovering hydrogen; splitting water; product recovery; producing gaseous; evolved gases; receiving gas; /423/95/

Citation Formats

Greenbaum, Elias. Process for photosynthetically splitting water. United States: N. p., 1984. Web.
Greenbaum, Elias. Process for photosynthetically splitting water. United States.
Greenbaum, Elias. Sun . "Process for photosynthetically splitting water". United States. https://www.osti.gov/servlets/purl/865188.
@article{osti_865188,
title = {Process for photosynthetically splitting water},
author = {Greenbaum, Elias},
abstractNote = {The invention is an improved process for producing gaseous hydrogen and oxygen from water. The process is conducted in a photolytic reactor which contains a water-suspension of a photoactive material containing a hydrogen-liberating catalyst. The reactor also includes a volume for receiving gaseous hydrogen and oxygen evolved from the liquid phase. To avoid oxygen-inactivation of the catalyst, the reactor is evacuated continuously by an external pump which circulates the evolved gases through means for selectively recovering hydrogen therefrom. The pump also cools the reactor by evaporating water from the liquid phase. Preferably, product recovery is effected by selectively diffusing the hydrogen through a heated semipermeable membrane, while maintaining across the membrane a magnetic field gradient which biases the oxygen away from the heated membrane. This promotes separation, minimizes the back-reaction of hydrogen and oxygen, and protects the membrane.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

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