In situ IR Study of COS Hydrolysis over Lanthanum Oxysulfide: Effect of O2, H2S and SO2

Abstract

Abstract:

The effect of the presence of O₂, H₂S and SO₂ in the feed on the COS hydrolysis was studied comparatively over La₂O₂S and γ-Al₂O₃. Compared to the traditional γ-Al₂O₃ catalyst, La₂O₂S was observed to be obviously superiosity in resistance to the poisoning of oxygen and sulfide at higher temperature. A certain amount of O₂ or H₂S+O₂ has no effect on the activity of La₂O₂S, while decrease the activity of γ-Al₂O₃ signi-ficantly. The presence of SO₂ would decrease the activity of both catalysts,but the impact on La₂O₂S weakens as the temperature rises. The analysis of TPD and in situ IR reveals that O₂, H₂S and SO₂ shows different adsorption characteristics over La₂O₂S and γ-Al₂O₃. Hence, COS proceed the two catalysts via different reaction mechanisms. Spectroscopies of H₂S, O₂ in situ IR reveal that La₂O₂S hydrolyze via Eley-Rideal mechanism. The rare-La₂O₂S catalyst displays an excellent poisoing performance,because SO₂ can transfer the lattice S^2- inside the La₂O₂S.

Key words: Carbonyl sulfide, Hydrolysis, In situ IR, Rare earth oxide, Rare earth oxysulfide, Temperature programmed desorption

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JIN Xing-Mei*, MA Jian-Xin, ZHOU Wei. In situ IR Study of COS Hydrolysis over Lanthanum Oxysulfide: Effect of O₂, H₂S and SO₂[J]. Chem. J. Chinese Universities, 2009, 30(6): 1194.

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In situ IR Study of COS Hydrolysis over Lanthanum Oxysulfide: Effect of O₂, H₂S and SO₂

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