The effect of H2O on the reduction of SO2 and NO by CO on La2O2S

Ngai T. Lau; Ming Fang; Chak K. Chan

doi:10.1016/j.apcatb.2007.10.004

The effect of H2O on the reduction of SO2 and NO by CO on La2O2S

Ngai T. Lau, Ming Fang, Chak K. Chan

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19 Scopus citations

Abstract

The effect of H2O on the catalytic reduction of SO2 and NO on La2O2S was studied using temperature-programmed reaction coupled with fast mass spectrometry, powder X-ray diffraction and X-ray photoelectron spectroscopy. It is found that La2O2S can be completely and irreversibly deactivated in the presence of H2O at 700 °C when NO/SO2 is sufficiently high (∼1.0). This is caused by the formation of a layer of inactive and stable La2O2SO4 on the oxysulfide. When NO is absent or NO/SO2 is low (∼0.4), H2O inhibits the reduction and shifts the selectivity from sulfur to H2S. While the causes of the deactivation can be attributed to the Reverse Claus Reaction between H2O and sulfur in the oxysulfide, the competitive hydrolysis of the COS intermediate and the competitive adsorption of H2O, the shift in selectivity to H2S is attributable to the former two factors. © 2007 Elsevier B.V. All rights reserved.

Original language	English (US)
Pages (from-to)	110-116
Number of pages	7
Journal	Applied Catalysis B: Environmental
Volume	79
Issue number	2
DOIs	https://doi.org/10.1016/j.apcatb.2007.10.004
State	Published - Feb 28 2008
Externally published	Yes

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Generated from Scopus record by KAUST IRTS on 2023-07-06

ASJC Scopus subject areas

General Environmental Science
Catalysis
Process Chemistry and Technology

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10.1016/j.apcatb.2007.10.004

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title = "The effect of H2O on the reduction of SO2 and NO by CO on La2O2S",

abstract = "The effect of H2O on the catalytic reduction of SO2 and NO on La2O2S was studied using temperature-programmed reaction coupled with fast mass spectrometry, powder X-ray diffraction and X-ray photoelectron spectroscopy. It is found that La2O2S can be completely and irreversibly deactivated in the presence of H2O at 700 °C when NO/SO2 is sufficiently high (∼1.0). This is caused by the formation of a layer of inactive and stable La2O2SO4 on the oxysulfide. When NO is absent or NO/SO2 is low (∼0.4), H2O inhibits the reduction and shifts the selectivity from sulfur to H2S. While the causes of the deactivation can be attributed to the Reverse Claus Reaction between H2O and sulfur in the oxysulfide, the competitive hydrolysis of the COS intermediate and the competitive adsorption of H2O, the shift in selectivity to H2S is attributable to the former two factors. {\textcopyright} 2007 Elsevier B.V. All rights reserved.",

author = "Lau, {Ngai T.} and Ming Fang and Chan, {Chak K.}",

note = "Generated from Scopus record by KAUST IRTS on 2023-07-06",

year = "2008",

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doi = "10.1016/j.apcatb.2007.10.004",

language = "English (US)",

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T1 - The effect of H2O on the reduction of SO2 and NO by CO on La2O2S

AU - Lau, Ngai T.

AU - Fang, Ming

AU - Chan, Chak K.

N1 - Generated from Scopus record by KAUST IRTS on 2023-07-06

PY - 2008/2/28

Y1 - 2008/2/28

N2 - The effect of H2O on the catalytic reduction of SO2 and NO on La2O2S was studied using temperature-programmed reaction coupled with fast mass spectrometry, powder X-ray diffraction and X-ray photoelectron spectroscopy. It is found that La2O2S can be completely and irreversibly deactivated in the presence of H2O at 700 °C when NO/SO2 is sufficiently high (∼1.0). This is caused by the formation of a layer of inactive and stable La2O2SO4 on the oxysulfide. When NO is absent or NO/SO2 is low (∼0.4), H2O inhibits the reduction and shifts the selectivity from sulfur to H2S. While the causes of the deactivation can be attributed to the Reverse Claus Reaction between H2O and sulfur in the oxysulfide, the competitive hydrolysis of the COS intermediate and the competitive adsorption of H2O, the shift in selectivity to H2S is attributable to the former two factors. © 2007 Elsevier B.V. All rights reserved.

AB - The effect of H2O on the catalytic reduction of SO2 and NO on La2O2S was studied using temperature-programmed reaction coupled with fast mass spectrometry, powder X-ray diffraction and X-ray photoelectron spectroscopy. It is found that La2O2S can be completely and irreversibly deactivated in the presence of H2O at 700 °C when NO/SO2 is sufficiently high (∼1.0). This is caused by the formation of a layer of inactive and stable La2O2SO4 on the oxysulfide. When NO is absent or NO/SO2 is low (∼0.4), H2O inhibits the reduction and shifts the selectivity from sulfur to H2S. While the causes of the deactivation can be attributed to the Reverse Claus Reaction between H2O and sulfur in the oxysulfide, the competitive hydrolysis of the COS intermediate and the competitive adsorption of H2O, the shift in selectivity to H2S is attributable to the former two factors. © 2007 Elsevier B.V. All rights reserved.

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JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

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ER -

The effect of H2O on the reduction of SO2 and NO by CO on La2O2S

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