Solid-State Kinetic Investigations of Nonisothermal Reduction of Iron Species Supported on SBA-15

Table 3

Mössbauer parameters for 9.3 wt% Fe_Nitrate, 7.2 wt% Fe_Nitrate, 2.0 wt% Fe_Nitrate, and 10.7 wt% Fe_Citrate. Temperature, , isomer shift, (referred to -Fe at 298 K and not corrected for 2nd-order Doppler shift), quadrupole shift, , line widths, , hyperfine magnetic field, , fluctuation rate, , and area. indicates values held fixed in simulation. [] indicates that relaxation rate reached the dynamic limit.

Sample	/K	/mm/s	/mm/s	/mm/s	/T	/mm/s	Area/%
9.3 wt% Fe_Nitrate	300	0.320 (9)	0.173 (42)	0.29 (11)	48.3	[]	48
		0.327 (8)	0.536 (37)	0.277 (45)	48.3	[]	52
	14	0.401 (21)	−0.012 (20)	0.28	46.5 (2.7)	0.13	45
		0.465 (11)	−0.018 (11)	0.28	50.0 (1.2)	0.02	52
		0.401	0.43	0.37	48.3	310	3
7.2 wt% Fe_Nitrate	300	0.330 (5)	0.299 (15)	0.190 (16)	48.3	[]	52
		0.307 (7)	0.508 (27)	0.233 (17)	48.3	[]	48
	14	0.394 (35)	−0.014 (43)	0.23	45.4 (5)	0.3	49
		0.462 (19)	−0.034 (19)	0.23	49.7 ()	0.1	39
		0.431 (72)	0.518 (59)	0.45	48.3	[]	12
2.0 wt% Fe_Nitrate	300	0.336 (15)	0.346 (78)	0.273 (60)	48.3	[]	60
		0.312 (21)	0.583 (95)	0.265 (71)	48.3	[]	40
	14	0.421	0.08 (12)	0.24 (76)	43.8 (1.5)	0.7	55
		0.423 (48)	0.500 (60)	0.437 (80)	48.3	520	45
10.7 wt% Fe_Citrate	300	0.294 (12)	0.206 (39)	0.34 (12)	48.3	[]	45
		0.316 (12)	0.672 (50)	0.376 (49)	48.3	[]	55
	14		−0.008 (64)	0.20	43.5	5.6	34
		0.451 (10)	−0.005 (97)	0.20	43.5 (7)	0.5	31
		0.438 (15)	0.466 (22)	0.23	48.3	[]	25
		0.416 (38)	0.814 (50)	0.23	48.3	[]	10
	4	0.497 (62)	0.018 (62)	0.20	48.9 (5)	0.05	14
		0.424 (47)	−0.026 (45)	0.20	45.0 (6)	0.45	81
		0.438	0.47	0.23	48.3	[]	1
		0.416	0.81	0.23	48.3	[]	4