Structural Features of (Ce, La or Sr)(Mn or Co)O3 Nano-Perovskites as a Catalyst for Carbon Monoxide Oxidation

doi:10.1007/s40195-014-0060-4

Abstract

Abstract:

The collection of different cations in the A and B sites of ABO₃ was explored for the regularity of perovskites phase formability. Here, Sr²⁺, La³⁺, and Ce⁴⁺ are selected as the cations of site A. The site B is considered to be Mn or Co cations. XRD analysis and Fourier transform infrared spectroscopy results confirm the formation of perovskite structure for catalysts in which La³⁺ and Sr²⁺ are considered as the cations of site A. Ceria is detected as the main crystalline phase when Ce⁴⁺ is selected to be cation of site A. It is found that the octahedral factor (r_B/r_O) takes the same important role as the tolerance factor to form cubic perovskite. Average crystallite size of the products was calculated by data of the XRD and measured by the TEM analysis. Results of the XRD and TEM studies were supported by the study of the particles size distribution, which was carried out in a particle size analyzer. The perovskite samples were also used for stoichiometric oxidation of carbon monoxide with air.

Key words: Carbon monoxide, Nano-perovskite, Oxidation, Cerium, Lanthanum, Strontium

Mahnaz Ghiasi, Azim Malekzadeh. Structural Features of (Ce, La or Sr)(Mn or Co)O₃ Nano-Perovskites as a Catalyst for Carbon Monoxide Oxidation[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 635-641.

Figures/Tables 9

References 21

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Sample	Composition	Temperature of calcination (°C)	Concentration of Mn(NO₃)₂·4H₂O (mol/L)	Concentration of Co(NO₃)₂·6H₂O (mol/L)	Concentration of Sr(NO₃)₂ (mol/L)	Concentration of La(NO₃)₃·6H₂O (mol/L)	Concentration of Ce(NO₃)₃·6H₂O (mol/L)
No. 1	LaCoO₃	600	–	0.20	–	0.20	–
No. 2	LaCoO₃	900	–	0.20	–	0.20	–
No. 3	LaMnO₃	600	0.20	–	–	0.20	–
No. 4	LaMnO₃	900	0.20	–	–	0.20	–
No. 5	SrCoO₃	900	–	0.25	0.25	–	–
No. 6	SrMnO₃	900	0.25	–	0.25	–	–
No. 7	CeCoO₃	900	–	0.25	–	–	0.25
No. 8	CeMnO₃	900	0.20	–	–	–	0.20
No. 9	CeMnO₃	1100	0.20	–	–	–	0.20
No. 10^a	CeMnO₃	1100	0.20	–	–	–	0.20

Sample	Composition	Temperature of calcination (°C)	Concentration of Mn(NO₃)₂·4H₂O (mol/L)	Concentration of Co(NO₃)₂·6H₂O (mol/L)	Concentration of Sr(NO₃)₂ (mol/L)	Concentration of La(NO₃)₃·6H₂O (mol/L)	Concentration of Ce(NO₃)₃·6H₂O (mol/L)
No. 1	LaCoO₃	600	–	0.20	–	0.20	–
No. 2	LaCoO₃	900	–	0.20	–	0.20	–
No. 3	LaMnO₃	600	0.20	–	–	0.20	–
No. 4	LaMnO₃	900	0.20	–	–	0.20	–
No. 5	SrCoO₃	900	–	0.25	0.25	–	–
No. 6	SrMnO₃	900	0.25	–	0.25	–	–
No. 7	CeCoO₃	900	–	0.25	–	–	0.25
No. 8	CeMnO₃	900	0.20	–	–	–	0.20
No. 9	CeMnO₃	1100	0.20	–	–	–	0.20
No. 10^a	CeMnO₃	1100	0.20	–	–	–	0.20

Sample	Composition	Crystal system	Space group	a (nm)	c (nm)	α (°)
Nos. 1 and 2	LaCoO₃	Rhombohedral	R-3	0.54	0.54	60
Nos. 3 and 4	LaMnO₃	Cubic	Pm-3m	0.39	0.39	90
No. 5	SrCoO₃	Hexagonal	–	0.55	0.42	90
No. 6	SrMnO₃	Hexagonal	P63/mmc	0.55	0.91	90
Nos. 7–10	CeO₂	Cubic	Fm-3m	0.54	0.54	90

Sample	Composition	Crystal system	Space group	a (nm)	c (nm)	α (°)
Nos. 1 and 2	LaCoO₃	Rhombohedral	R-3	0.54	0.54	60
Nos. 3 and 4	LaMnO₃	Cubic	Pm-3m	0.39	0.39	90
No. 5	SrCoO₃	Hexagonal	–	0.55	0.42	90
No. 6	SrMnO₃	Hexagonal	P63/mmc	0.55	0.91	90
Nos. 7–10	CeO₂	Cubic	Fm-3m	0.54	0.54	90

Sample	Composition	Crystallite size (nm)		BET (m²/g)	Total pore volume (mL/g)	Average pore diameter (nm)
Sample	Composition	S	W–H	BET (m²/g)	Total pore volume (mL/g)	Average pore diameter (nm)
No. 1	LaCoO₃	39	50	–	–	–
No. 2	LaCoO₃	44	52	6	0.02	14.16
No. 3	LaMnO₃	22	30	–	–	–
No. 4	LaMnO₃	26	38	7	0.02	14.02
No. 5	SrCoO₃	36	51	5	0.01	7.45
No. 6	SrMnO₃	43	56	5	0.01	9.38
No. 7	CeO₂	46	59	–	–	–
No. 8	CeO₂	46	58	–	–	–
Nos. 9 and 10	CeO₂	51	63	–	–	–

Structural Features of (Ce, La or Sr)(Mn or Co)O₃ Nano-Perovskites as a Catalyst for Carbon Monoxide Oxidation

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Sample	A cation	r_A (nm)	B cation	r_B (nm)	t-value	Octahedral factor
No. 1 and 2	La³⁺	0.103	Co³⁺	0.055	0.88	0.39
No. 3 and 4	La³⁺	0.103	Mn³⁺	0.065	0.84	0.46
No. 5	Sr²⁺	0.118	Co⁴⁺	0.053	0.95	0.38
No. 6	Sr²⁺	0.118	Mn⁴⁺	0.053	0.95	0.38
No. 7	Ce³⁺	0.101	Co³⁺	0.055	0.87	0.39
No. 8	Ce³⁺	0.101	Mn³⁺	0.065	0.83	0.46

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Sample	10%	50%	90%
No. 1	116	183	199
No. 2	192	215	232
No. 3	145	154	162
No. 4	145	212	228
No. 5	265	295	338
No. 6	215	285	333

Sample	10%	50%	90%
No. 1	116	183	199
No. 2	192	215	232
No. 3	145	154	162
No. 4	145	212	228
No. 5	265	295	338
No. 6	215	285	333