Sulfur Storage and Release from Automotive Catalysts

Henk, M. G.; White, Jeff J.; Denison, Gregory

doi:10.4271/872134

Cited by 20 publications

(3 citation statements)

References 8 publications

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“…The interaction between SO 2 and CeO 2 has been widely investigated in the literature, since CeO 2 is a well known promoter currently used in three way catalytic mufflers [13][14][15][16][17]. Some works evidenced an increase of SO 2 uptake on CeO 2 with respect to Al 2 O 3 [18][19][20] associated with the higher basic strength of ceria [17,18]. On the other hand a decrease of adsorbed SO 2 onto CeO 2 and CeO 2 -ZrO 2 in the presence of noble metals was reported in reference [21].…”

Section: Introductionmentioning

confidence: 99%

Regeneration of S-poisoned Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for the combustion of methane

et al. 2007

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This work investigates the regeneration of S-poisoned Pd/Al 2 O 3 and Pd/CeO 2 /Al 2 O 3 catalysts under different CH 4 containing atmospheres. Under lean combustion conditions in the presence of excess O 2 , partial regeneration took place for both systems only above 750°C after decomposition of stable sulphate species adsorbed on the support. Under alternate lean combustion/CH 4 -reducing pulse regeneration is markedly anticipated down to 550-600°C. Experiments evidenced an effective role of ceria in preventing PdO from sulphation and in promoting regeneration via sulphates decomposition under reducing conditions.

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Section: Introductionmentioning

confidence: 99%

Regeneration of S-poisoned Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for the combustion of methane

et al. 2007

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“…The search for sulfur tolerant emission control systems in automobiles is driven by a need to maintain long-term efficiency in current three-way catalysts, the problems of H 2 S emissions, the high sensitivity of potential lean burn catalysts toward SO 2 , and problems of stable, deactivating sulfate formation on NO adsorbers . In current three-way convertors, ceria is added mainly for oxygen storage, but its function and activity is affected by reaction with SO 2 , leading to decreased oxygen storage capacity and H 2 S emissions. , Ceria, doped ceria, and transition metal promoted ceria have also been shown to be effective catalysts for SO 2 removal by reduction with CO and methane, suggesting applications for flue gas desulfurization in stationary sources. , …”

Section: Introductionmentioning

confidence: 99%

“…1 In current three-way convertors, ceria is added mainly for oxygen storage, 2 but its function and activity is affected by reaction with SO 2 , leading to decreased oxygen storage capacity and H 2 S emissions. 3,4 Ceria, doped ceria, and transition metal promoted ceria have also been shown to be effective catalysts for SO 2 removal by reduction with CO and methane, suggesting applications for flue gas desulfurization in stationary sources. 5,6 Although many of these problems have been circumvented, the details of the mechanisms of the relevant reactions are still not always clear.…”

Section: Introductionmentioning

confidence: 99%

Chemisorption and Reaction of Sulfur Dioxide with Oxidized and Reduced Ceria Surfaces

et al. 1999

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The interaction of SO2 with highly oriented ceria films is studied as a function of coverage, temperature, and degree of oxidation of the ceria. Soft X-ray photoemission (SXPS) is used to analyze the oxidation state of the ceria and the evolution of the SO2-derived species, while thermal desorption spectroscopy is used to analyze the desorption products. The principle interaction is chemisorption of SO2 at oxygen anions, which reversibly desorbs as SO2 over a broad temperature range from 200 to 600 K. This interaction is characterized as a Lewis acid−base interaction and occurs with approximately equal facility if the surface is hydroxylated or sulfided. On reduced ceria the adsorption is more heterogeneous, suggesting a variety of local bonding environments, including a small, distinguishable amount of adsorption at Ce3+ sites. A significant portion of the chemisorbed SO2 converts to sulfide above 300 K, and the resulting sulfide then equilibrates between bulk and surface sites above 600 K. Adsorption at a sulfide site leads to a 1.5 eV shift in the sulfide S 2p state toward higher binding energy. Thermal conversion of chemisorbed SO2 to sulfate is not observed. The results are compared with previous studies of NO adsorption on ceria films and with similar studies of SO2 chemisorption on titania.

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Influence of desulfurization strategies for methane gaseous direct injection engine on carbon dioxide emissions

Fischer¹,

Günther²,

Pischinger³

et al. 2022

Journal of Natural Gas Science and Engineering

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Sulfur Storage and Release from Automotive Catalysts

Cited by 20 publications

References 8 publications

Regeneration of S-poisoned Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for the combustion of methane

Regeneration of S-poisoned Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for the combustion of methane

Chemisorption and Reaction of Sulfur Dioxide with Oxidized and Reduced Ceria Surfaces

Influence of desulfurization strategies for methane gaseous direct injection engine on carbon dioxide emissions

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