Selective catalytic reduction of NOx with NH3 over Ce-Mn oxide and Cu-SSZ-13 composite catalysts – Low temperature enhancement

Andana, Tahrizi; Rappé, Kenneth G.; Nelson, Nicholas C.; Gao, Feng; Wang, Yong

doi:10.1016/j.apcatb.2022.121522

Cited by 43 publications

(46 citation statements)

References 48 publications

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“…The replacement of vanadium with manganese [135][136][137][138][139][140] or copper [141] as the active component for SCR of NO x has received increasing attention because of the potential to function under lower temperature conditions than vanadium, which is a distinct economic process advantage. Here, cerium oxide has been shown to provide the same tangible benefits observed with vanadium oxide-based catalyst systems.…”

Section: No X Remediationmentioning

confidence: 99%

The Emergence of the Ubiquity of Cerium in Heterogeneous Oxidation Catalysis Science and Technology

Brazdil

2022

Catalysts

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Research into the incorporation of cerium into a diverse range of catalyst systems for a wide spectrum of process chemistries has expanded rapidly. This has been evidenced since about 1980 in the increasing number of both scientific research journals and patent publications that address the application of cerium as a component of a multi-metal oxide system and as a support material for metal catalysts. This review chronicles both the applied and fundamental research into cerium-containing oxide catalysts where cerium’s redox activity confers enhanced and new catalytic functionality. Application areas of cerium-containing catalysts include selective oxidation, combustion, NOx remediation, and the production of sustainable chemicals and materials via bio-based feedstocks, among others. The newfound interest in cerium-containing catalysts stems from the benefits achieved by cerium’s inclusion, which include selectivity, activity, and stability. These benefits arise because of cerium’s unique combination of chemical and thermal stability, its redox active properties, its ability to stabilize defect structures in multicomponent oxides, and its propensity to stabilize catalytically optimal oxidation states of other multivalent elements. This review surveys the origins and some of the current directions in the research and application of cerium oxide-based catalysts.

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Section: No X Remediationmentioning

confidence: 99%

The Emergence of the Ubiquity of Cerium in Heterogeneous Oxidation Catalysis Science and Technology

Brazdil

2022

Catalysts

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“…Among the various metal oxides, MnO x -CeO 2 catalyst has been studied extensively due to its nontoxicity and outstanding low-temperature activity, therefore it should be an ideal candidate for improving the low-temperature activity of Cu-SSZ-13 catalyst (Qi et al, 2004). Liu et al (2017) supported 6D) (Andana et al, 2022). Furthermore, this composite catalyst could circumvent the challenge of NH 4 NO 3 deposits inhibiting low-temperature SCR on Cu-SSZ-13.…”

Section: Metal Oxidesmentioning

confidence: 99%

“…(D) Schematic diagram of SCR mechanism of MnO x -CeO 2 -Cu-SSZ-13 composite catalyst. Reproduced with permission Andana et al (2022) , Copyright 2022, Elsevier Publishers. (E) Enhanced high-temperature SCR activity and schematic diagram of the highly dispersed ZrO 2 modified Cu-SSZ-13.…”

Section: Introducing the Heteroatoms Or Metal Oxidesmentioning

confidence: 99%

“…Based on the above discussion, several options have been proposed to improve the SCR activity of Cu-SSZ-13 catalysts. An alternative is to add a second phase (metal oxide) to Cu-SSZ-13 to help improve low-temperature activity except for co-exchanging Cu-SSZ-13 with heteroatoms, in which the improvement in low-temperature SCR performance is limited since the co-cations appear to enhance Cu redox capacity, but decrease Cu loading by competing for the exchange sites ( Table 4 ) ( Andana et al, 2021 ; 2022 ). The metal oxide in Cu-SSZ-13 zeolite-metal oxide composite catalyst carried out the oxidative function to partially convert NO to NO 2 to enable the fast SCR reaction over the catalyst.…”

Section: Introducing the Heteroatoms Or Metal Oxidesmentioning

confidence: 99%

“…The sample had excellent NO x conversions above 90% from 125 to 450 °C and good H 2 O and SO 2 resistances. Recently, the reaction pathway of MnO x -CeO 2 -Cu-SSZ-13 composite catalyst was revealed, in which the oxide-derived nitrites/nitrite-precursors (e.g., HONO, N 2 O 3 ) reacted with Cu-SSZ-13 stored NH 3 species to generate NH 4 NO 2 intermediate whose decomposition is almost barrierless assisted by the Brønsted-acid site ( Figure 6D ) ( Andana et al, 2022 ). Furthermore, this composite catalyst could circumvent the challenge of NH 4 NO 3 deposits inhibiting low-temperature SCR on Cu-SSZ-13.…”

Section: Introducing the Heteroatoms Or Metal Oxidesmentioning

confidence: 99%

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Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Xin

Zhang

et al. 2022

Front. Chem.

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Nitrogen oxides (NOx), which are the major gaseous pollutants emitted by mobile sources, especially diesel engines, contribute to many environmental issues and harm human health. Selective catalytic reduction of NOx with NH3 (NH3-SCR) is proved to be one of the most efficient techniques for reducing NOx emission. Recently, Cu-SSZ-13 catalyst has been recognized as a promising candidate for NH3-SCR catalyst for reducing diesel engine NOx emissions due to its wide active temperature window and excellent hydrothermal stability. Despite being commercialized as an advanced selective catalytic reduction catalyst, Cu-SSZ-13 catalyst still confronts the challenges of low-temperature activity and hydrothermal aging to meet the increasing demands on catalytic performance and lifetime. Therefore, numerous studies have been dedicated to the improvement of NH3-SCR performance for Cu-SSZ-13 catalyst. In this review, the recent progress in NH3-SCR performance optimization of Cu-SSZ-13 catalysts is summarized following three aspects: 1) modifying the Cu active sites; 2) introducing the heteroatoms or metal oxides; 3) regulating the morphology. Meanwhile, future perspectives and opportunities of Cu-SSZ-13 catalysts in reducing diesel engine NOx emissions are discussed.

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Mesoporous Ceria and Ceria‐Praseodymia as High Surface Area Supports for Pd‐based Catalysts with Enhanced Methane Oxidation Activity

Ballauri,

Sartoretti,

Castellino

et al. 2024

ChemCatChem

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In recent years, Pd/CeO2 materials have proven to be effective catalysts for the total oxidation of methane. In this work, three different synthesis routes were used to prepare high specific surface area supports, consisting of pure CeO2 and 10 at% Pr‐doped ceria (Ce90Pr10). Nano‐structured spheres were obtained with a microwave‐assisted synthesis, dumbbell‐like particles were produced through a urea‐based hydrothermal method, and ordered mesoporous oxides were prepared by using SBA‐15 as hard‐template. The six materials were then impregnated with 2 wt% Pd, calcined at 500 °C, and comprehensively characterized. All the samples retained their high surface area after impregnation (75–110 m2 g−1), allowing a good dispersion of palladium. No significant structural or morphological differences were observed upon Pr doping, but a higher Pd oxidation state was induced by Pr‐doped supports. However, all Pd/CeO2 and Pd/Ce90Pr10 catalysts exhibited similar activity for dry methane oxidation below 500 °C, regardless of the synthesis technique and of the Pr presence: they all achieved almost complete CH4 oxidation at 400 °C, showing a really remarkable improvement with respect to analogous low surface area supports. A promoting role of Pr was instead noticed in wet conditions, thanks to its ability to counteract water‐induced deactivation phenomena.

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Selective catalytic reduction of NOx with NH3 over Ce-Mn oxide and Cu-SSZ-13 composite catalysts – Low temperature enhancement

Cited by 43 publications

References 48 publications

The Emergence of the Ubiquity of Cerium in Heterogeneous Oxidation Catalysis Science and Technology

The Emergence of the Ubiquity of Cerium in Heterogeneous Oxidation Catalysis Science and Technology

Recent progress in performance optimization of Cu-SSZ-13 catalyst for selective catalytic reduction of NOx

Mesoporous Ceria and Ceria‐Praseodymia as High Surface Area Supports for Pd‐based Catalysts with Enhanced Methane Oxidation Activity

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