Effect of A Site-deficiency on the Structure and Catalytic Oxidation Activity of the La-Sr-Co-O Perovskite

doi:10.7503/cjcu20210311

Abstract

Abstract:

The La-Sr-Co-O perovskite was prepared by citrate acid complex method， and then the Sr ions was selectively dissolved to obtain A site-deficient perovskite. The changes of phase structure， coordination environment and electronic properties of the A site-deficient perovskite were investigated by powder X-ray diffraction（XRD）， X-ray absorption fine structures（XAFS）， inductively coupled plasma-optical emission spectro- scopy（ICP-OES）， X-ray photoelectron spectroscopy（XPS） and Raman spectra characterization techniques. The corresponding catalytic activity was also evaluated through the CO and NO oxidation reaction. The results show that Sr-rich region is reconstructed by acid treatment through selective dissolving SrCO₃ and SrO. The deficiency of Sr（A-site） lead to the exsolution of Co in the form of new Co₃O₄ phase. More oxygen vancancies were also generated， which facilitates the generation of oxygen vacancy and activation of the lattice oxygen species. Therefore， the A site-deficient perovskite performed better CO and NO oxidation ability under low temperatures.

Key words: A-deficiency, Perovskite, Acid treatment, CO oxidation, NO oxidation

CLC Number:

O643

TrendMD:

GAO Zhongnan, GUO Lihong, ZHAO Dongyue, LI Xingang. Effect of A Site-deficiency on the Structure and Catalytic Oxidation Activity of the La-Sr-Co-O Perovskite[J]. Chem. J. Chinese Universities, 2021, 42(9): 2869.

Figures/Tables 13

References 27

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Catalyst	Molar fraction（%， ICP）			Molar fraction（%， SEM?EDS）				Molar fraction（%， XPS）
Catalyst	La	Co	Sr	La	Co	Sr	O	La	Co	Sr	O
LSC	44.49	32.9	22.61	20.58	25.68	5.02	47.72	3.71	7.29	8.89	89.12
LSC?NA	48.41	42.94	8.65	16.91	27.72	1.09	54.27	6.62	11.32	1.29	80.77

Catalyst	Molar fraction（%， ICP）			Molar fraction（%， SEM?EDS）				Molar fraction（%， XPS）
Catalyst	La	Co	Sr	La	Co	Sr	O	La	Co	Sr	O
LSC	44.49	32.9	22.61	20.58	25.68	5.02	47.72	3.71	7.29	8.89	89.12
LSC?NA	48.41	42.94	8.65	16.91	27.72	1.09	54.27	6.62	11.32	1.29	80.77

Catalyst	E/eV Content（%）
Catalyst	O_latt	O_ads	CO₃^2-/ OH^-	O_latt	O_ads
LSC	528.51	531.26	533.14	17.6	76.2
LSC?NA	529.21	531.18	532.88	23.5	64.5

Catalyst	E/eV Content（%）
Catalyst	O_latt	O_ads	CO₃^2-/ OH^-	O_latt	O_ads
LSC	528.51	531.26	533.14	17.6	76.2
LSC?NA	529.21	531.18	532.88	23.5	64.5