Atomic Nitrogen Reactions

Vibrationally excited nitrogen molecules (v = 1, 2, 3) generated in the discharge have been detected by Raman spectroscopy [330]. 

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The formation of the cyanopolyynes (HC2nCN) is closely tied to the synthesis of hydrocarbons. Both hydrocarbon ion-atomic nitrogen reactions 41 viz.,... 

The 4,5-dihydro compounds (34) might be expected to show different properties. Here, as with the pyrazolines discussed in Section IV, A, lone pairs of electrons should be available on both nitrogen atoms for reaction to give salts of type 35 and/or 36. No salts of type 35 have been reported. Indeed, the reaction between the alkyl halide... 

C06-0135. The five stable oxides of nitrogen are NO, NOg, Ng O, Ng O4, and N2 O5. Balance each of the following oxidation reactions, and then use standard formation enthalpies to calculate the heats of reaction per mole of atomic nitrogen for each reaction ... 

Figure 7.20. Coverage of atomic nitrogen on Fe(l 11) on the basis of Eqs. (57) and (68). Desorption in ultrahigh vacuum is observed as a symmetric TPD peak around 740 K. Note that at reaction conditions employingO.l bar(10 Pa) of nitrogen the surface will be largely covered by nitrogen atoms.

Figure 7.21 shows the results for the ammonia synthesis on real catalysts in a reactor. The surface is predominantly covered by atomic nitrogen and by NH intermediates. This actually limits the rate of the reaction as soon as an appreciable partial pressure of ammonia has built up. In fact, ammonia poisons the reaction. 

Transient kinetic experiments have also been carried out to complement the information deduced from the steady-state measurements [33], Systematic variations were observed during the transition from the clean surface to the steady-state catalytic regime that correlate well with the overall reaction rates in the latter. Specifically, there is a time delay in the production of molecular nitrogen because of the need to buildup a threshold of atomic nitrogen coverage on the surface. This atomic nitrogen coverage, which could... 

Metal Complexes as Catalysts for Oxygen, Nitrogen, and Carbon-atom Transfer Reactions... 

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