Regenerable ceria-based SOx traps for sulfur removal in lean exhausts

Kylhammar, Lisa; Carlsson, Per-Anders; Ingelsten, Hanna Härelind; Grönbeck, Henrik; Skoglundh, Magnus

doi:10.1016/j.apcatb.2008.04.003

Cited by 49 publications

(39 citation statements)

References 23 publications

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“…It has been shown that the presence of platinum can enhance the performance of ceria-based SO x traps, which is explained by the formation of SO 3 over noble metal sites and the subsequent spillover to the support. 46,47 In the present study, both the IR spectra (??) and the integrated peak areas for sulfates on silica and terminal silanols (??)…”

Section: Discussionmentioning

confidence: 99%

Vibrational Study of SO_x Adsorption on Pt/SiO₂

et al. 2014

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The formation of ad-SO x species on Pt/SiO 2 upon exposure to SO 2 in concentrations ranging from 10 to 50 ppm at between 200 and 400 C has been studied by in situ diffuse reflectance infrared Fourier transformed spectroscopy. In parallel, first-principles calculations have been carried out to consolidate the experimental interpretations. It was found that sulfate species form on the silica surface with a concomitant removal/rearrangement of silanol groups. Formation of ad-SO x species occurs only after SO 2 oxidation to SO 3 on the platinum surface. Thus SO 2 oxidation to SO 3 is the first step in the SO x adsorption process, followed by spillover of SO 3 to the oxide and, finally, the formation of sulfate species on the hydroxyl positions on the oxide. The sulfate formation is influenced by both temperature and SO 2 concentration.

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Section: Discussionmentioning

confidence: 99%

Vibrational Study of SO_x Adsorption on Pt/SiO₂

et al. 2014

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“…Moreover, while SO 3 reacts with virtually all metal oxides to form sulfates [9,[35][36][37][38][39][40][41][42][43], non-alkaline earth sulfates decompose at moderate temperature levels (<700 • C) which enables their generation at reasonable energy costs [2]. Furthermore, copper and cerium have been reported to promote their mutual dispersion [15,24,29,44,45].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cu-Ce/KIT-6 materials for SOx removal

Gaudin

Dorge

Nouali

et al. 2015

Applied Catalysis A: General

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“…The use of ceria for SO x trapping for efficient use of lean-burn and diesel engines was recently suggested and investigated. 5 Many experimental studies of SO 2 adsorption on ceria have been presented in the literature. Here we will mention some, where ambitious attempts to identify the adsorpa) Electronic mail: yzx@henannu.edu.cn.…”

Section: Introductionmentioning

confidence: 99%

SOx on ceria from adsorbed SO2

Müller²,

Yang³

et al. 2011

The Journal of Chemical Physics

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Results from first-principles calculations present a rather clear picture of the interaction of SO(2) with unreduced and partially reduced (111) and (110) surfaces of ceria. The Ce(3+)∕Ce(4+) redox couple, together with many oxidation states of S, give rise to a multitude of SO(x) species, with oxidation states from +III to +VI. SO(2) adsorbs either as a molecule or attaches via its S-atom to one or two surface oxygens to form sulfite (SO(3)(2-)) and sulfate (SO(4)(2-)) species, forming new S-O bonds but never any S-Ce bonds. Molecular adsorption is found on the (111) surface. SO(3)(2-) structures are found on both the (111) and (110) surfaces of both stoichiometric and partially reduced ceria. SO(4)(2-) structures are observed on the (110) surface together with the formation of two reduced Ce(3+) surface cations. SO(2) can also partially heal the ceria oxygen vacancies by weakening a S-O bond, when significant electron transfer from the surface (Ce4f) into the lowest unoccupied molecular orbital of the SO(2) adsorbate takes place and oxidizes the surface Ce(3+) cations. Furthermore, we propose a mechanism that could lead to monodentate sulfate formation at the (111) surface.

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Regenerable ceria-based SOx traps for sulfur removal in lean exhausts

Cited by 49 publications

References 23 publications

Vibrational Study of SO_x Adsorption on Pt/SiO₂

Vibrational Study of SO_x Adsorption on Pt/SiO₂

Synthesis of Cu-Ce/KIT-6 materials for SOx removal

SOx on ceria from adsorbed SO2

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Regenerable ceria-based SOx traps for sulfur removal in lean exhausts

Cited by 49 publications

References 23 publications

Vibrational Study of SOx Adsorption on Pt/SiO2

Vibrational Study of SOx Adsorption on Pt/SiO2

Synthesis of Cu-Ce/KIT-6 materials for SOx removal

SOx on ceria from adsorbed SO2

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Vibrational Study of SO_x Adsorption on Pt/SiO₂

Vibrational Study of SO_x Adsorption on Pt/SiO₂