n-Heptane As a Reducing Agent in the NOx Removal over a Pt–Ba/Al2O3 NSR Catalyst

Righini, Laura; Kubiak, Lukasz Maciej; Morandi, Sara; Castoldi, L.; Lietti, Luca; Forzatti, Pio

doi:10.1021/cs500850g

Cited by 9 publications

(5 citation statements)

References 62 publications

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“…However, it is not possible to exclude that NO might be released in the gas phase and subsequently readsorbed and decomposed at metal Pt sites to give N 2 and NH 3 . As a matter of fact, the onset temperature for the reaction between gaseous NO and the reducing agent is always lower than that of the reduction of the stored nitrates, namely near 40 °C vs. 150-160 °C for H 2 [30], near 100 °C vs. near 150 °C for NH 3 [27], near 160 °C vs. 200 °C for CO [31], and near 180 °C vs. 230 °C for n-heptane [32].…”

Section: The Role Of the Reducing Agent In The No X Releasementioning

confidence: 99%

Mechanistic aspects of the release and the reduction of NO stored on Pt–Ba/Al2O3

Castoldi

Righini

Matarrese

et al. 2015

Journal of Catalysis

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Section: The Role Of the Reducing Agent In The No X Releasementioning

confidence: 99%

Mechanistic aspects of the release and the reduction of NO stored on Pt–Ba/Al2O3

Castoldi

Righini

Matarrese

et al. 2015

Journal of Catalysis

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“…This oxidation reaction is also an essential step in the Ostwald process for nitric acid production. 4 Tremendous effort has been deployed over the last decades to develop active NO oxidation catalysts including supported noble metals, 5 multimetal oxides, perovskite type, 6 and activated carbon catalysts. 7 However, catalysts with even higher activity are still required, and this calls for the exploration of a novel class of materials.…”

mentioning

confidence: 99%

Mechanistic Insight into the Catalytic NO Oxidation by the MIL-100 MOF Platform: Toward the Prediction of More Efficient Catalysts

Lyu

Maurin

2020

ACS Catal.

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Through density functional theory calculations, we unravel a microscopic picture of the catalytic NO oxidation activity of the MIL-100 MOF platform. By systematically varying the nature of the coordinatively unsaturated metal sites (Al, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Ru), we demonstrate the relative energy of the metal–oxygen intermediate species to be a reliable descriptor to anticipate the catalytic activity of this family of MOFs. These conclusions are first validated by experimental data on MIL-100(Fe)/MIL-100(Fe,Mn) and further used as guidelines to develop a ruthenium-based MIL-100 with even better catalytic performance.

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“…In fact, a progressive decrease with the temperature was observed from approximately 16% to values lower than 2% between 200 and 350 • C, respectively. N 2 O is generated during the rich period and at the rich/lean transition due to the combination between the incomplete reduction of NO x adsorbed on the NSR catalyst at low temperature and the exothermic reaction between NO and H 2 at the rich period at high temperature [16,54]. On the other hand, lower N 2 O-selectivity values were noted at temperatures below 250 • C for the NSR-2Cu-SSZ-13 configuration compared to the single NSR system.…”

Section: Deno X Activitymentioning

confidence: 99%

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

et al. 2023

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DeNOx activity in a NSR–SCR hybrid system of two copper-containing chabazite-type zeolitic catalysts was addressed. A Pt-Ba-K/Al2O3 model catalyst was used as the NSR (NOx storage and reduction) catalyst. For the SCR (selective catalytic reduction) system, two Cu-CHA zeolites were synthesized employing a single hydrothermal synthesis method assisted with ultrasound and incorporating Cu in a 2 wt.%, 2Cu-SAPO-34 and 2Cu-SSZ-13. The prepared catalysts were characterized, and the crystallinity, surface area, pore size, HR-TEM and EDX mapping, coordination of Cu ions and acidity were compared. The NH3 storage capacity of the SCR catalysts was 1890 and 837 μmol NH3·gcat−1 for 2Cu-SAPO-34 and 2Cu-SSZ-13, respectively. DeNOx activity was evaluated for the single NSR system and the double-bed NSR–SCR by employing alternating lean (3%O2) and rich (1%H2) cycles, maintaining a concentration of 600 ppm NO, 1.5% H2O and 0.3% CO2 between 200 and 350 °C. The addition of the SCR system downstream of the NSR catalyst significantly improved NOx conversion mainly at low temperature, maintaining the selectivity to N2 above 80% and reaching values above 90% at 250 °C when the 2Cu-SSZ-13 catalyst was located. The total reduction in the production of NH3 and ~2% of N2O was observed when comparing the NSR–SCR configuration with the single NSR catalyst.

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n-Heptane As a Reducing Agent in the NO_x Removal over a Pt–Ba/Al₂O₃ NSR Catalyst

Cited by 9 publications

References 62 publications

Mechanistic aspects of the release and the reduction of NO stored on Pt–Ba/Al2O3

Mechanistic aspects of the release and the reduction of NO stored on Pt–Ba/Al2O3

Mechanistic Insight into the Catalytic NO Oxidation by the MIL-100 MOF Platform: Toward the Prediction of More Efficient Catalysts

Comparison of Cu-CHA-Zeolites in the Hybrid NSR-SCR Catalytic System for NOx Abatement in Mobile Sources

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