Table 1. Mössbauer parameters and spectral contributions of ⁵⁷Fe-ferrierite.

57Fe-FER	Isomer shift	Quadrupole splitting	Rel.	Fe species
Fe/Al 0.04	mm/s	mm/s	%
Evacuated*	0.93	0.46	33	Fe(II)
	0.98	0.72	40	Fe(II)
	1.02	2.06	27	Fe(II)
+O2†	0.89	0.51	10	Fe(II)
	1.60	1.32	18	Fe(II)
	0.38	0.78	72	Fe(III)-O−●
+O2/CH4‡	0.98	0.49	39	Fe(II)
	0.90	0.83	31	Fe(II)
	1.05	2.14	30	Fe(II)

*An evacuation at 450°C for 3 hours.

†An evacuation at 450°C for 3 hours, then an interaction with O₂ at room temperature for 40 min, and after that, an O₂ desorption at 200°C for 5 min.

‡An evacuation at 450°C for 3 hours, then an interaction with O₂ at room temperature for 40 min, and consequently, a desorption of O₂ at 200°C for 5 min, and after that, an interaction with CH₄ at room temperature for 40 min, and subsequently, an evacuation of CH₄ at 200°C for 5 min.