Studies of SO2 Poisoning Mechanism for Perovskite LaCoO3 Model Catalyst

Abstract

Abstract: In this work, the SO₂ poisoning mechanism of model catalyst and powder catalyst of LaCoO₃ has been investigated. The changes of the structure and the chemical states of the elements have been characterized using XRD, TEM, AES and XPS. The results showed that the perovskite structure of LaCoO₃ was destroyed by the invading of S. Some La₂(SO₄)₃ and CoO species were formed on the surface of the poisoned sample, while La₂(SO₄)₃, La₂(SO₃)₃ and CoO species were the main production in the interior of the LaCoO₃ layer, which led to the loss of the catalysis activity. The content of S in the layer increased with the increase of temperature and time. After the sample was poisoned at a relatively high temperature or for a fairly long time, the distribution of S in the LaCoO₃ layer became homogeneous with the depth and the concentration being decreased, suggesting that a dynamic equilibrium was achieved between the poisoning reaction and the decomposition of the sulphurous salts.

Key words: LaCoO₃, SO₂-poisoning mechanism, Perovskite, Film

CLC Number:

O643.1

TrendMD:

ZHU Yong-Fa, TAN Rui-Qin, FENG Jie, JI Shi-Shan, CAO Li-Li . Studies of SO₂ Poisoning Mechanism for Perovskite LaCoO₃ Model Catalyst[J]. Chem. J. Chinese Universities, 2000, 21(11): 1733.

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Studies of SO₂ Poisoning Mechanism for Perovskite LaCoO₃ Model Catalyst

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