Hydrolysis of COS over Rare Earth Oxysulfides

Abstract

Abstract: The hydrolysis of carbonyl sulfide was studied over a novel type of rare earth oxysulfides catalyst. The order of catalytic activity of the rare earth oxysulfides was in the sequence: La≈Pr≈ Nd≈ Sm>Eu>Ce>Gd≈Ho>Dy>Er. The analysis of XRD reveals that the catalytic activity could be well related to the easiness of the sulfidation from their oxides to the corresponding oxysulfides and the rare earth oxysulfide is the active phase for the hydrolysis of COS. The effect of the presence of O₂ or SO₂ in the feed was investigated over La₂O₂S and Nd₂O₂S, respectively. At the O₂ volume fraction below 1.5% there was not any effect on the COS conversion and at 2% a COS conversion of higher than 90% was obtained at temperature over 150 ℃. The catalytic activity of COS hydrolysis decreased in the presence of SO₂ at a temperature below 300 ℃. The poisoning effect of SO₂ was reversible and may be caused by the competitive adsorption between SO₂ and COS on the surface of rare earth oxysulfides.

Key words: Carbonyl sulfide, Hydrolysis, Rare earth oxide, Rare earth oxysulfide

CLC Number:

O643

TrendMD:

ZHANG Yi-Qun, XIAO Zhong-Bin, MA Jian-Xin , ZHOU Wei, WU Min-Zhong . Hydrolysis of COS over Rare Earth Oxysulfides[J]. Chem. J. Chinese Universities, 2004, 25(4): 721.

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Hydrolysis of COS over Rare Earth Oxysulfides

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