Takeuchi&Kubotera, LLP
Direct synthesis of hydrazine through nitrogen fixation by means of two-photon absorptions
Two methods and apparatuses are described for hydrazine synthesis through nitrogen fixation induced by photoexcitation of N2. Both methods of photoexcitation of N2 for hydrazine synthesis involve a two-photon absorption process. The first method of N2 fixation with H2 uses a high-energy short-pulsed Nd: YAG laser with wavelength of 1.06 μm. The two-photon absorption of N2 is followed by a vibrational-vibrational (V—V) energy transfer that leads to a near-complete population inversion of N2 vibrational states. The energy separation of these states is larger than the activation energy needed for N2H4 formation. The second method of N2 fixation 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 N2 to a highly excited vibrational state, which has enough energy to both dissociate H2O into H2 and O2, and to react with H2 to form N2H4 as in the above direct method of N2 fixation with H2.
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C01B B01J B01J B01J B01J
inventional additional inventional inventional inventional
Ching-Sung
Chang