Water splitting by titanium exchanged zeolite A
Analysis of the product resulting from the equilibration 25 g of zeolite A with 50 cc of unstirred 20% titanium chloride solution for 1 h at ambient temperature indicated that 75% of the potassium cations are replaced by titanium cations on the surface of the /sup 1///sub 16/ in.-diameter Linde 3A particles; the cages probably remained intact since little aluminum leaching occurred. Approximately 0.4 cc of gas (40% hydrogen, 60% air) per g of zeolite was collected after direct exposure to strong illumination (> or = 8000 ft-c) for >5 m followed by a 45 m period without illumination. Ti exchanged zeolites X and Y did not evolve detectable H/sub 2/ under similar conditions. The authors concluded that a photoformed radical composed of a Ti(IV)-oxygen complex in which four oxygen atoms surround the Ti atom in a perfect tetrahedron with the unpaired electrons shared by the oxygen atoms is the precursor of H/sub 2/ formation in water submerged titanium-zeolite A. Partial regeneration was accomplished by heating the inactive material to 275/sup 0/C at 3 x 10/sup -2/ Torr for 4 h.
- Research Organization:
- Univ. of Utah, Salt Lake City
- OSTI ID:
- 6618450
- Journal Information:
- J. Am. Chem. Soc.; (United States), Vol. 100:21
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN PRODUCTION
PHOTOCHEMICAL REACTIONS
TITANIUM CHLORIDES
ZEOLITES
AQUEOUS SOLUTIONS
CHEMICAL REACTION YIELD
COMPARATIVE EVALUATIONS
HIGH TEMPERATURE
MASS SPECTRA
MEDIUM VACUUM
PHOTOLYSIS
PRESSURE DEPENDENCE
REGENERATION
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TITANIUM COMPLEXES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
DECOMPOSITION
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MINERALS
MIXTURES
SOLUTIONS
SPECTRA
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
YIELDS
080106* - Hydrogen- Production- Biosynthesis & Photochemical Processes
400500 - Photochemistry