Single Brick Solution for Lean‐Burn DeNO x and Soot Abatement

Gil, Sonia; García-Vargas, Jesús Manuel; Liotta, Leonarda F.; Vernoux, P.; Giroir‐Fendler, A.

doi:10.1002/9783527686605.ch35

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“…These two different types of heterogeneous catalytic approaches have different potentials for application depending on the vehicle type and engine size. Among them, urea/ammonia-SCR is a widely commercialized technology for NO x removal in stationary sources and heavy-duty vehicles. , However, SCR technology which works very effectively for diesel-engine applications suffers from economic/ergonomic penalties associated with the use of a reducing agent (typically urea) that needs to be externally added to the catalytic system. Thus, its adoption to lean-burn engines requires complex exhaust after-treatment systems.…”

Section: Introductionmentioning

confidence: 99%

Pt/CeO_x/ZrO_x/γ-Al₂O₃ Ternary Mixed Oxide DeNO_x Catalyst: Surface Chemistry and NO_x Interactions

Andonova

Drenchеv

et al. 2018

J. Phys. Chem. C

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Surface chemistry and the nature of the adsorbed NO x species on a Pt/CeO 2 −ZrO 2 /Al 2 O 3 catalyst were investigated by IR spectroscopy, X-ray diffraction, H 2temperature programmed reduction, and NO x-temperature programmed desorption. Parallel studies were also carried out with benchmark samples such as CeO 2 /Al 2 O 3 , ZrO 2 /Al 2 O 3 , CeO 2 −ZrO 2 /Al 2 O 3 and Pt-supported versions of these materials. All samples were studied in their reduced and nonreduced forms. The use of CO as a probe molecule revealed that during the synthesis of the mixed-metal oxide systems, deposited zirconia preferentially interacted with the alumina hydroxyls, while deposited ceria was preferentially located at the Lewis acid sites. Despite the limited extent of Zr 4+ ions incorporated into the CeO 2 lattice, the reduction of ceria was promoted and occurred at lower temperatures in the presence of zirconia. When deposited on ZrO 2 /Al 2 O 3 , platinum formed relatively big particles and existed in metallic state even in the nonreduced samples. The presence of ceria hindered platinum reduction during calcination and yielded a high platinum dispersion. Subsequent reduction with H 2 led to the production of metallic Pt particles. Consequently, NO adsorption on nonreduced Pt-containing materials was negligible but was enhanced on the reduced samples because of Pt 0-promoted NO disproportionation. The nature of the nitrogen-oxo species produced after NO and O 2 coadsorption on different samples was similar. Despite the high thermal stability of the NO x adsorbed species on the ceria and zirconia adsorption sites, the NO x reduction in the presence of H 2 was much more facile over Pt/CeO 2 −ZrO 2 /Al 2 O 3. Thus, the main differences in the NO x reduction functionalities of the investigated materials could be related to the ability of the catalysts to activate hydrogen at relatively lower temperatures.

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Section: Introductionmentioning

confidence: 99%

Pt/CeO_x/ZrO_x/γ-Al₂O₃ Ternary Mixed Oxide DeNO_x Catalyst: Surface Chemistry and NO_x Interactions

Andonova

Drenchеv

et al. 2018

J. Phys. Chem. C

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Single Brick Solution for Lean‐Burn DeNO x and Soot Abatement

Cited by 1 publication

References 85 publications

Pt/CeO_x/ZrO_x/γ-Al₂O₃ Ternary Mixed Oxide DeNO_x Catalyst: Surface Chemistry and NO_x Interactions

Pt/CeO_x/ZrO_x/γ-Al₂O₃ Ternary Mixed Oxide DeNO_x Catalyst: Surface Chemistry and NO_x Interactions

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Single Brick Solution for Lean‐Burn DeNO x and Soot Abatement

Cited by 1 publication

References 85 publications

Pt/CeOx/ZrOx/γ-Al2O3 Ternary Mixed Oxide DeNOx Catalyst: Surface Chemistry and NOx Interactions

Pt/CeOx/ZrOx/γ-Al2O3 Ternary Mixed Oxide DeNOx Catalyst: Surface Chemistry and NOx Interactions

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Pt/CeO_x/ZrO_x/γ-Al₂O₃ Ternary Mixed Oxide DeNO_x Catalyst: Surface Chemistry and NO_x Interactions

Pt/CeO_x/ZrO_x/γ-Al₂O₃ Ternary Mixed Oxide DeNO_x Catalyst: Surface Chemistry and NO_x Interactions