Transition metal/fluorite-type oxides as active catalysts for reduction of sulfur dioxide to elemental sulfur by carbon monoxide

Liu, Wei; Wadia, Cyrus; Flytzani‐Stephanopoulos, Maria

doi:10.1016/s0920-5861(96)00248-9

Cited by 66 publications

(48 citation statements)

References 21 publications

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“…Thus, sulfur is a primary product and very high space velocity can be used without affecting the sulfur yield. The formation of surface oxygen vacancies by CO reduction is an important step in catalyst activation [15,16]. The created surface oxygen vacancies can also be capped by other oxidizing agents, such as carbon dioxide and water.…”

Section: Introductionmentioning

confidence: 99%

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Redox chemistry over CeO2-based catalysts: SO2 reduction by CO or CH4

et al. 1999

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The catalytic reduction of SO 2 to elemental sulfur by CO and CH 4 over Cu-modi®ed ceria catalysts is studied in this work. Doped and undoped ceria are active catalysts for the SO 2 reduction by CO or CH 4 in the temperature range 450±7508C. When CO is used as the reductant, the reaction follows the redox mechanism, and formation of surface defects (oxygen vacancies) and ceria reducibility are important for catalyst activity. SO 2 strongly adsorbs on the catalyst surface forming sulfates. Partial reduction of sulfate by CO is necessary for the reaction to light off and proceed at low temperatures. Addition of copper improves the low-temperature catalyst activity by increasing the reducibility of ceria and providing sites for CO adsorption. On the other hand, methane activation is limited by the thermal stability of surface sulfates. The activation of methane may involve surface oxygen species and partially reduced metal oxide sites at high temperature. Two independent reactions are proposed and used to explain the catalytic performance of ceria-based oxides in CH 4 SO 2 gas mixtures. One reaction leads to elemental sulfur and complete oxidation (CO 2 H 2 O) products, while the second produces H 2 S and COH 2 O under fuel-rich conditions. The addition of copper suppresses the latter, thus increasing the catalyst selectivity to elemental sulfur. The catalyst activity/selectivity studies were complemented by SO 2 uptake experiments in a TGA and reduction studies of the asprepared and pre-sulfated catalysts in CO and methane, both isothermally and in the TPR mode. #

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Section: Introductionmentioning

confidence: 99%

“…The created surface oxygen vacancies can also be capped by other oxidizing agents, such as carbon dioxide and water. The catalytic activity and resistance to water vapor of cerium oxides can be signi®cantly enhanced by addition of small amounts of a transition metal, such as copper [15,16].…”

Section: Introductionmentioning

confidence: 99%

Redox chemistry over CeO2-based catalysts: SO2 reduction by CO or CH4

et al. 1999

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“…For a vast number of oxide compounds, this comes out from the fact that the preparation procedures are not able to give a size distribution approaching the delta function (39 (11), and ceria based materials, useful as DeSOx catalysts (14,15).…”

Section: Chemistry Of So 2 and Desox Processes On Oxide Nanoparticlesmentioning

confidence: 99%

“…A dopant may help in this respect. However, surface reduction by CO is still the key step to initiate the reaction (55). Under reaction conditions, CO and SO 2 compete for the surface oxygen.…”

Section: Interaction With Ceo 2 and Doped-ceriamentioning

confidence: 99%

“…Thus, a synergistic effect was observed for the Cu-dopped ceria. Copper and cerium oxide probably play different roles in the redox mechanism (55). Cerium oxide comprises the matrix of the catalyst and provides the oxygen and oxygen vacancy sources, while Cu cations promote the reducibility of cerium oxide and provide surface sites for CO adsorption (55,57).…”

Section: Interaction With Ceo 2 and Doped-ceriamentioning

confidence: 99%

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Chemistry of SO ₂ and DeSO _x Processes on Oxide Nanoparticles

Rodríguez¹

2006

Synthesis, Properties, and Applications of Oxide Nanomaterials

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Metal Oxide Nanoparticles

Fernández

Rodríguez

2005

Encyclopedia of Inorganic Chemistry

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This article covers the fundamental science, synthesis, characterization, physicochemical properties, and applications of oxide nanomaterials. It also explains the fundamental aspects that determine the growth and behavior of these systems, briefly examines synthetic procedures using bottom‐up and top‐down fabrication technologies, discusses the sophisticated experimental techniques and state‐of‐the‐art theory results used to characterize the physicochemical properties of oxide solids, and describes the current knowledge concerning key oxide materials with important technological applications.

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Transition metal/fluorite-type oxides as active catalysts for reduction of sulfur dioxide to elemental sulfur by carbon monoxide

Cited by 66 publications

References 21 publications

Redox chemistry over CeO2-based catalysts: SO2 reduction by CO or CH4

Redox chemistry over CeO2-based catalysts: SO2 reduction by CO or CH4

Chemistry of SO ₂ and DeSO _x Processes on Oxide Nanoparticles

Metal Oxide Nanoparticles

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Transition metal/fluorite-type oxides as active catalysts for reduction of sulfur dioxide to elemental sulfur by carbon monoxide

Cited by 66 publications

References 21 publications

Redox chemistry over CeO2-based catalysts: SO2 reduction by CO or CH4

Redox chemistry over CeO2-based catalysts: SO2 reduction by CO or CH4

Chemistry of SO 2 and DeSO x Processes on Oxide Nanoparticles

Metal Oxide Nanoparticles

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Chemistry of SO ₂ and DeSO _x Processes on Oxide Nanoparticles