NOx reduction in the Di-Air system over noble metal promoted ceria

Wang, Yixiao; Kapteijn, Freek; Makkee, Michiel

doi:10.1016/j.apcatb.2018.02.004

Cited by 20 publications

(19 citation statements)

References 47 publications

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“…This catalytic architecture was found to have potential for the NO x elimination process because of the pronounced redox properties of ceria and its strong interaction with transition metals. 28 Incorporation of zirconium in the ceria component is known to improve the catalytic performance by enhancing the resistance of the material to sintering, and boosting the reducibility of ceria, leading to a greater population of oxygen vacancies which are responsible for the activity of the catalyst toward oxygen-containing molecules. The presence of ZrO 2 inhibits the undesirable interaction of CeO 2 with Al 2 O 3 , preventing the deactivation of the Ce(IV)/Ce(III) redox couple due to formation of CeAlO 3 .…”

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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“…Room temperature Raman results indicated that the Rh/CLZ samples had more oxygen vacancies as compared to CLZ. 18 A 5 nm ceria crystal size was determined by the Scherrer equation (XRD) and was further confirmed by the analysis of the TEM micrographs. The particle size of Rh was around 2 nm as indicated in the TEM micrographs.…”

Section: −1mentioning

confidence: 93%

“…Characterization details of the CLZ support and Rh/CLZ catalyst were reported in detail elsewhere. [16][17][18][19][20][21] In brief, a 0.5 wt% Rh loading was confirmed by ICP-OES (0.0486 mmol g cat…”

Section: Structure Composition and Texture Propertiesmentioning

confidence: 97%

“…Details on the characterization and instruments can be found in our previous publications. [16][17][18][19][20][21] 2.2. Catalytic testing 2.2.1.…”

Section: Materials Preparation and Characterizationmentioning

confidence: 99%

“…15 The comprehensive work by Wang and Makkee has addressed the working principle and application of this Di-Air system in NO reduction. [16][17][18][19][20][21] Oxygen vacancies within the ceria lattice of a reduced ceria, Pt/ceria or Rh/ceria were found to be the selective catalytic sites for the NO reduction into only N 2 (100% selectivity). 16 Even at low NO concentrations (ppm levels), NO could compete for oxygen vacancies with (100×) excess of O 2 and CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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NOx reduction in the Di-Air system over noble metal promoted ceria

Cited by 20 publications

References 47 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

A new dynamic N₂O reduction system based on Rh/ceria–zirconia: from mechanistic insight towards a practical application

Temporal Analysis of Product (TAP)

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NOx reduction in the Di-Air system over noble metal promoted ceria

Cited by 20 publications

References 47 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

A new dynamic N2O reduction system based on Rh/ceria–zirconia: from mechanistic insight towards a practical application

Temporal Analysis of Product (TAP)

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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

A new dynamic N₂O reduction system based on Rh/ceria–zirconia: from mechanistic insight towards a practical application