Kraft Lignin Conversion into Energy Carriers under the Action of Electromagnetic Radiation
Table 3
Mössbauer parameters of the spectra at Т = 300 K of samples 0.1 Fe/(kraft lignin) and 0.1 Fe–1.5 Ni/(kraft lignin) before and after the experiments.
Sample
Fe form
δ
Δ
Hin, T
A (%)
±0.03 mm/s
±0.5T
±0.05
0.1 Fe/(kraft lignin)-initial
Fe3+ (paramagn.)
0.36
0.73
—
0.82
Fe2+ (paramagn.)
0.74
1.10
0.18
0.1 Fe/(kraft lignin)-solid rest after experiment
Fe3+ (paramagn.)
0.38
1.00
—
0.52
Fe3O4+δ (А)
0.35
0.03
48.7
0.13
Fe3O4+δ (В)
0.66
0.02
44.8
0.17
FeO (paramagn.)
−0.08
—
—
0.18
0.1 Fe-1.5 Ni/(kraft lignin)-initial
Fe3+ (paramagn.)
0.36
0.89
—
1.00
0.1 Fe-1.5 Ni/(kraft lignin)-solid rest after experiment
Fe3+ (paramagn.)
0.36
0.87
—
0.62
Fe2+ (paramagn.)
0.66
1.61
—
0.10
Fe3O4+δ (А)
0.26
-0.02
48.4
0.12
Fe3O4+δ (В)
0.69
0.04
45.7
0.16
А (tetrahedral) and В (octahedral) sites of superparamagnetic clusters of nonstoichiometric magnetite; possibly γ-Fe-C. δ is an isomeric shift relative to a-Fe; Δ is the quadrupole splitting or quadrupole shift; Hin is the internal magnetic field on 57 Fe nucleus; A is the relative content.
