Direct synthesis of hydrazine through nitrogen fixation by...

Details Direct synthesis of hydrazine through nitrogen fixation by... Direct synthesis of hydrazine through nitrogen fixation by...

2006-10-10

2006-10-10

Langel, Wayne A. (Department: 1754)

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

C423S407000

Reexamination Certificate

active

07118655

ABSTRACT:
Two methods and apparatuses are described for hydrazine synthesis through nitrogen fixation induced by photoexcitation of N2. Both methods of photoexcitation of N2for hydrazine synthesis involve a two-photon absorption process. The first method of N2fixation with H2uses a high-energy short-pulsed Nd: YAG laser with wavelength of 1.06 μm. The two-photon absorption of N2is followed by a vibrational-vibrational (V—V) energy transfer that leads to a near-complete population inversion of N2vibrational states. The energy separation of these states is larger than the activation energy needed for N2H4formation. The second method of N2fixation with H2O uses a high-energy short-pulsed blue laser with wavelength of 0.4 μm. The two-photon absorption at 0.4 μm pumps N2to a highly excited vibrational state, which has enough energy to both dissociate H2O into H2and O2, and to react with H2to form N2H4as in the above direct method of N2fixation with H2.

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