Mechanochemical Synthesis and Characterization of Nanocrystalline Copper-Cobalt Ferrites

doi:10.1007/s40195-015-0207-y

Abstract

Abstract:

Nanocrystalline copper-cobalt ferrites with composition Cu_1-xCo_xFe₂O₄, where x = 0.2 and 0.8, were synthesized by mechanochemical treatment of co-precipitated precursors. The ferrite powders were characterized by XRD and Mössbauer spectroscopy. Results proved obtaining of spinel ferrites with crystallite size smaller than 10 nm. Increasing of crystallite size of samples with increasing of mechanochemical treatment duration was established, too. Catalytic properties of obtained ferrites were tested in reactions of oxidation of CO, methanol and dimethyl ether. High catalytic activity of nanocrystalline copper-cobalt ferrites toward CO and CH₃OH (about 100% conversions of CO and CH₃OH at 160 °C) and moderate activity toward (CH₃)₂O oxidation were established. The results obtained revealed that the Co/Cu atomic ratio is an important factor determinant the behavior of catalysts toward methanol and DME oxidation.

Key words: Mechanochemical synthesis, Nanocrystalline, Ferrites, Mössbauer spectroscopy, Catalysis

Nikolay Velinov, Dimitar Dimitrov, Kremena Koleva, Krassimir Ivanov, Ivan Mitov. Mechanochemical Synthesis and Characterization of Nanocrystalline Copper-Cobalt Ferrites[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(3): 367-372.

Figures/Tables 7

References 22

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Sample	Components	δ (mm/s)	Δ (mm/s)	B (T)	Γ _exp (mm/s)	G (%)
Cu_0.2Co_0.8Fe₂O₄-MS1	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.70	-	0.50	76
Cu_0.2Co_0.8Fe₂O₄-MS1	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.82	-	0.53	24
Cu_0.2Co_0.8Fe₂O₄-MS2	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.71	-	0.53	74
Cu_0.2Co_0.8Fe₂O₄-MS2	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.79	-	0.56	26
Cu_0.8Co_0.2Fe₂O₄-MS1	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.75	-	0.49	72
Cu_0.8Co_0.2Fe₂O₄-MS1	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.95	-	0.57	28
Cu_0.8Co_0.2Fe₂O₄-MS2	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.00	47.0	0.75	3
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.00	44.0	0.75	2
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.75	-	0.50	71
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.99	-	0.54	24
Cu_0.2Co_0.8Fe₂O₄-MS1 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	42.8	2.00	36
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	37.0	1.90	40
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.70	-	0.78	18
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.82	-	0.70	6
Cu_0.2Co_0.8Fe₂O₄-MS2 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	45.4	1.05	49
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	37.7	1.50	38
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.70	-	0.72	11
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.82	-	0.55	2
Cu_0.8Co_0.2Fe₂O₄-MS1 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	49.7	0.80	5
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	45.0	0.80	2
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.75	-	0.51	68
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.95	-	0.57	25
Cu_0.8Co_0.2Fe₂O₄-MS2 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	49.9	0.80	11
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	46.0	0.80	5
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.76	-	0.51	52
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.95	-	0.65	32

Sample	Components	δ (mm/s)	Δ (mm/s)	B (T)	Γ _exp (mm/s)	G (%)
Cu_0.2Co_0.8Fe₂O₄-MS1	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.70	-	0.50	76
Cu_0.2Co_0.8Fe₂O₄-MS1	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.82	-	0.53	24
Cu_0.2Co_0.8Fe₂O₄-MS2	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.71	-	0.53	74
Cu_0.2Co_0.8Fe₂O₄-MS2	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.79	-	0.56	26
Cu_0.8Co_0.2Fe₂O₄-MS1	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.75	-	0.49	72
Cu_0.8Co_0.2Fe₂O₄-MS1	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.95	-	0.57	28
Cu_0.8Co_0.2Fe₂O₄-MS2	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.00	47.0	0.75	3
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.00	44.0	0.75	2
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.37	0.75	-	0.50	71
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.27	0.99	-	0.54	24
Cu_0.2Co_0.8Fe₂O₄-MS1 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	42.8	2.00	36
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	37.0	1.90	40
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.70	-	0.78	18
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.82	-	0.70	6
Cu_0.2Co_0.8Fe₂O₄-MS2 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	45.4	1.05	49
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	37.7	1.50	38
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.70	-	0.72	11
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.82	-	0.55	2
Cu_0.8Co_0.2Fe₂O₄-MS1 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	49.7	0.80	5
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	45.0	0.80	2
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.75	-	0.51	68
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.95	-	0.57	25
Cu_0.8Co_0.2Fe₂O₄-MS2 LNT	Sx1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.00	49.9	0.80	11
	Sx2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.00	46.0	0.80	5
	Db1-\( {\text{Fe}}_{\text{octa}}^{ 3+ } \)	0.48	0.76	-	0.51	52
	Db2-\( {\text{Fe}}_{\text{tetra}}^{ 3+ } \)	0.38	0.95	-	0.65	32