Superior low-temperature NO catalytic performance of PrMn2O5 over SmMn2O5 mullite-type catalysts

Thampy, Sampreetha; Ashburn, Nickolas; Liu, Chengfa; Xiong, Ka; Dillon, Sean; Zheng, Yongping; Chabal, Yves J.; Cho, Kyeongjae; Hsu, Julia W. P.

doi:10.1039/c9cy00490d

Cited by 19 publications

(42 citation statements)

References 42 publications

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“…HT synthesis causes crystal growth at lower temperatures than the CP method, which results in high‐surface‐area materials desirable for heterogeneous catalysis and has been successfully used to prepare mullite oxides. [ 43,44,61–64 ] To synthesize AMn 2 O 5 , the metal salt precursors of A, Mn, and KMnO 4 are mixed in a molar ratio of 5:7:3 in DI water and then a precipitating agent (NaOH or KOH) is added dropwise. The HT treatment is conducted at 180–200 °C for 24–48 h in an autoclave under autogenous pressure.…”

Section: Mullite‐type Oxide Structure Synthesis and Stabilitymentioning

confidence: 99%

“…The HT treatment is conducted at 180–200 °C for 24–48 h in an autoclave under autogenous pressure. [ 43,44,61–64 ] The mullite oxide catalysts prepared by this method exhibit high specific surface area with narrow particle size distribution and well‐controlled morphologies. For example, Ma et al synthesized SmMn 2 O 5 with different morphologies such as nanorods and nanoparticles by varying the pH and HT reaction time.…”

Section: Mullite‐type Oxide Structure Synthesis and Stabilitymentioning

confidence: 99%

“…[ 70 ] Based on experimental and DFT calculations, three types of lattice oxygens in different coordination environments, O α , O β , and O γ , are identified ( Figure a): O α is associated with the surface lattice oxygen on Mn 3+ site located in the square–pyramidal unit; O β is ascribed to the surface lattice oxygen on the Mn 4+ site in the octahedral units; and O γ is the lattice oxygen at the bottom of the octahedral unit connecting Mn 4+ to A 3+ sites. [ 62,71,72 ] Based on the density of states (DOS) of O 2 p orbital, Zheng et al showed that the available unoccupied O 2 p states above the Fermi level ( E F ) for SmMn 2 O 5 decreased as O α > O β > O γ (Figure 3b). By correlating the occupancy of O 2 p states with the experimental O 2 temperature‐programmed desorption (TPD) results, the authors determined that the MnO α had the weakest bond strength followed by MnO β and then MnO γ (Figure 3c).…”

Section: Origin Of Catalytic Activity and Reaction Mechanismsmentioning

confidence: 99%

“…Mullite oxides have been shown to catalyze several important oxidation reactions ( Figure ), including NO (Figure 6a), CO (Figure 6b), soot (Figure 6c), and volatile organic compounds (VOCs, Figure 6d) with enhanced performance. [ 38,40,41,43,44,62,76 ] The availability of multiple and distinct active sites i.e., Mn 3+ –O α and Mn 4+ –O β , renders mullite oxides their superior catalytic performance compared with catalysts with single active sites, including supported PGMs, binary TMOs, or perovskite oxides. The catalytic performance of mullite oxides is evaluated based on their catalytic activity, selectivity, and HT durability.…”

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

“…Data adapted from Refs. [40,41,43,62]. Right: Catalytic activities of AMn 2 O 5 for the oxidation reactions in (a– d ).…”

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

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Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Thampy

Ashburn

Cho

et al. 2021

Adv Energy and Sustain Res

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Driving innovations in the field of catalysis and electrocatalysis for a sustainable future necessitates the development of highly active, thermally stable, and low‐cost heterogeneous catalysts. Earth‐abundant transition metal‐based oxide catalysts are highly sought after to replace expensive platinum group metals. Identifying new catalyst formulations and design principles to tune materials’ bulk electronic structures and surface energetics for enhanced catalytic activity accelerates the search. Herein, the inherent attributes of mullite‐type oxides in catalyzing various oxidation reactions—crystal structure, electronic structure, stability, and catalytic activity—are reviewed. A comprehensive understanding of the nature of active sites, oxidation mechanisms, strategies to enhance the catalytic performance and regeneration of active sites, emerging opportunities in electrocatalysis and sensors, and challenges in computational methodologies is discussed. Finally, a perspective on expanding mullite‐type oxides’ viability for commercial applications in environmental and sustainable energy production through the integration of advanced synthetic approaches, operando spectroscopic techniques, and high‐throughput computational tools is outlined.

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Section: Mullite‐type Oxide Structure Synthesis and Stabilitymentioning

confidence: 99%

Section: Mullite‐type Oxide Structure Synthesis and Stabilitymentioning

confidence: 99%

Section: Origin Of Catalytic Activity and Reaction Mechanismsmentioning

confidence: 99%

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

“…Data adapted from Refs. [40,41,43,62]. Right: Catalytic activities of AMn 2 O 5 for the oxidation reactions in (a– d ).…”

Section: Diverse Oxidation Reactions Enabled By Mullite‐type Catalystsmentioning

confidence: 99%

See 3 more Smart Citations

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Thampy

Ashburn

Cho

et al. 2021

Adv Energy and Sustain Res

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Mn‐Based Mullites for Environmental and Energy Applications

Li,

Wang,

et al. 2024

Advanced Materials

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Mn‐based mullite oxides AMn2O5 (A = lanthanide, Y, Bi) is a novel type of ternary catalyst in terms of their electronic and geometric structures. The coexistence of pyramid Mn3+–O and octahedral Mn4+–O makes the d‐orbital selectively active toward various catalytic reactions. The alternative edge‐ and corner‐sharing stacking configuration constructs the confined active sites and abundant active oxygen species. As a result, they tend to show superior catalytic behaviors and thus gain great attention in environmental treatment and energy conversion and storage. In environmental applications, Mn‐based mullites have been demonstrated to be highly active toward low‐temperature oxidization of CO, NO, volatile organic compounds (VOCs), etc. Recent research further shows that mullites decompose O3 and ozonize VOCs from −20 °C to room temperature. Moreover, mullites enhance oxygen reduction reactions (ORR) and sulfur reduction reactions (SRR), critical kinetic steps in air‐battery and Li–S batteries, respectively. Their distinctive structures also facilitate applications in gas‐sensitive sensing, ionic conduction, high mobility dielectrics, oxygen storage, piezoelectricity, dehydration, H2O2 decomposition, and beyond. A comprehensive review from basic physicochemical properties to application certainly not only gains a full picture of mullite oxides but also provides new insights into designing heterogeneous catalysts.

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Flower-like lamellar SmMn2O5 nanosheets with electrochemical properties for the application in supercapacitor electrodes

Zhang

Wang

et al. 2023

J Mater Sci

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Superior low-temperature NO catalytic performance of PrMn₂O₅ over SmMn₂O₅ mullite-type catalysts

Abstract: PrMn2O5 is demonstrated as a superior catalyst compared to SmMn2O5 for low temperature NO oxidation, both experimentally and theoretically.

Cited by 19 publications

References 42 publications

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Earth‐Abundant Transition Metal‐Based Mullite‐Type Oxide Catalysts for Heterogeneous Oxidation Reactions

Mn‐Based Mullites for Environmental and Energy Applications

Flower-like lamellar SmMn2O5 nanosheets with electrochemical properties for the application in supercapacitor electrodes

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