Subnanometric Pt on Cu Nanoparticles Confined in Y‐zeolite: Highly‐efficient Catalysts for Selective Catalytic Reduction of NO<i>x</i> by CO

Li, Liang; Liu, Shaomian; Jiang, Ruihuan; Ji, Yongjun; Li, Huifang; Guo, Xiangfeng; Jia, Lei; Zhong, Ziyi; Su, Fabing

doi:10.1002/cctc.202001774

Cited by 20 publications

(12 citation statements)

References 42 publications

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“…Noble metals, such as Pd, Pt, Au, and Rh in the form of isolated metal cations, single-atoms, clusters, and nanoparticles, have been successfully confined within aluminosilicate and silicoaluminophosphate zeolites via impregnation method, thus giving superior catalytic activity in various catalytic oxidation and reduction processes. − For instance, Rh cations were introduced into the micropores of ZSM-5 zeolites via a combination of vacuum pumping and incipient wetness impregnation . In detail, Rh(NO 3 ) 3 aqueous solution was slowly dropped to H-ZSM-5 zeolite powder with a syringe pump, with the catalyst powder continuously stirring under vacuum.…”

Section: Synthetic Strategiesmentioning

confidence: 99%

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

2022

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Zeolites with ordered microporous systems, distinct framework topologies, good spatial nanoconfinement effects, and superior (hydro)thermal stability are an ideal scaffold for planting diverse active metal species, including single sites, clusters, and nanoparticles in the framework and framework-associated sites and extra-framework positions, thus affording the metal-in-zeolite catalysts outstanding activity, unique shape selectivity, and enhanced stability and recyclability in the processes of Brønsted acid-, Lewis acid-, and extra-framework metal-catalyzed reactions. Especially, thanks to the advances in zeolite synthesis and characterization techniques in recent years, zeolite-confined extraframework metal catalysts (denoted as metal@zeolite composites) have experienced rapid development in heterogeneous catalysis, owing to the combination of the merits of both active metal sites and zeolite intrinsic properties. In this review, we will present the recent developments of synthesis strategies for incorporating and tailoring of active metal sites in zeolites and advanced characterization techniques for identification of the location, distribution, and coordination environment of metal species in zeolites. Furthermore, the catalytic applications of metal-in-zeolite catalysts are demonstrated, with an emphasis on the metal@zeolite composites in hydrogenation, dehydrogenation, and oxidation reactions. Finally, we point out the current challenges and future perspectives on precise synthesis, atomic level identification, and practical application of the metal-in-zeolite catalyst system.

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Section: Synthetic Strategiesmentioning

confidence: 99%

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

2022

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“…Non-noble metals like Ni, 4 Fe, 4 Cu, 5 and Co 6 and their oxides such as CeO 2 , 3 CuO, 7 FeO x , 8 and CoO x 9 have been found to exhibit excellent catalytic performances in CO-SCR under O 2 -free conditions but lose their catalytic activity immediately in the presence of O 2 . A number of studies have confirmed that precious metals, such as Pt, 10 Pd, 11 Rh, 12 and Ir, 13 have O 2 resistance to a certain extent. However, the high cost of these metals and the high working temperature make them uncompetitive in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO₃ for Efficient NO Reduction by CO in the Presence of O₂

Chen

Liu

et al. 2023

ACS Catal.

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Developing efficient catalysts for the selective catalytic reduction of NO x by CO (CO-SCR) is the key challenge for commercializing this technology. Ag-based catalysts with relatively low costs are promising but widely believed to be not efficient enough for this reaction. Here, we demonstrate that atomically dispersed Ag supported on ordered mesoporous WO 3 (m-WO 3 ) can serve as a highly active catalyst for CO-SCR under O 2 -containing conditions. By altering the amount of the Ag precursor, the local environment of the Ag atom coordinated with the O atom can be tailored. Furthermore, at 250 °C and an O 2 /CO ratio of 2.5:1, 0.3Ag/m-WO 3 (0.3 wt % Ag) with six-coordinated Ag−O exhibited much better catalytic performance than 5 Ag/m-WO 3 (5 wt % Ag) with twocoordinated Ag−O (e.g., 0.43 vs 0.02 mol NO g Ag −1 h −1 in the reaction rate) and previously reported Ag-based catalysts in the literature. The theoretical calculations confirm that the six-coordinated Ag atoms in 0.3Ag/m-WO 3 possess a more positive oxidation state and a higher d-band center than the two-coordinated Ag atoms in 5Ag/m-WO 3 , promoting its bonding strength with coadsorption of the critical intermediates of N 2 O* and CO*. This work provides a feasible route for regulating the local environment of a Ag single atomic catalyst to enhance its catalytic property for CO-SCR.

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“…Many transition metals, such as Cu, Fe, Co, and Ni, and their oxides, including CuO, ,, CeO 2 , FeO x , CoO x , and MnO x , have shown good performance in CO-SCR under O 2 -free conditions but limited activity and poor N 2 selectivity under the O 2 -containing conditions. − As we know, real exhaust gases normally contain O 2 and/or SO 2 , and thus alternative catalysts with O 2 and SO 2 tolerance are highly demanded. Some noble metals, such as Pt, − Pd, Rh, Ir, , Au, and Ag, , have been investigated for CO-SCR, and among these, Pt-based catalysts, including Pt/TiO 2 -SG, Pt/SiO 2 , Pt/WO 3 /CeO 2 /ZrO 2 , Pt/W–Ce–Zr, and Pt–Ba/Al 2 O 3 , showed good CO-SCR performance under O 2 -containing conditions. However, these reported catalysts have poor resistance to SO 2 poisoning (even less than 50 ppm) due to easier SO 2 adsorption than NO and/or CO adsorption.…”

Section: Introductionmentioning

confidence: 99%

Negatively Charged Single-Atom Pt Catalyst Shows Superior SO₂ Tolerance in NO_x Reduction by CO

Liu

Song

et al. 2022

ACS Catal.

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Pt-based catalysts are promising for the selective catalytic reduction of NO x by CO (CO-SCR), but some technical issues hinder their practical application, including the high Pt loading needed, high reduction temperature, and the low tolerance toward SO 2 . Here, we report a novel Pt catalyst for CO-SCR, which has negatively charged single-atom Pt embedded on CuO squares, and the latter is supported on CoAlO nanosheets. This Pt−CuO/CoAlO catalyst with an ultra-low Pt loading (0.02 wt %) exhibited 91% NO conversion and 80% N 2 selectivity in 3% O 2 at 200 °C. More importantly, it showed almost no activity loss in 200 ppm SO 2 over a 15 h test. The theoretical calculations reveal that the negatively charged Pt has a stronger NO adsorption ability than the positively charged Pt, and Cu serves as the CO adsorption site. The much-weakened SO 2 adsorption on Pt−CuO/ CoAlO relative to the NO and CO adsorption effectively avoids the catalyst poisoning by SO 2 . KEYWORDS: Pt-based catalysts, hydrotalcite-like oxide, negatively charged Pt atoms, NO x reduction by CO, SO 2 tolerance ■ HIGHLIGHTS • A negatively charged Pt single-atom catalyst is synthesized. • This catalyst with an ultra-low Pt loading (0.02 wt%) exhibits an excellent low-temperature (200 °C) activity in the presence of 3% O 2 . • This catalyst displays excellent resistance to SO 2 poisoning (200 ppm for 15 h). • The negatively charged Pt promotes NO adsorption, and Cu acts as a CO adsorption site. • A lower SO 2 adsorption energy on this catalyst than NO and CO adsorption avoids its poisoning.

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Subnanometric Pt on Cu Nanoparticles Confined in Y‐zeolite: Highly‐efficient Catalysts for Selective Catalytic Reduction of NOx by CO

Cited by 20 publications

References 42 publications

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO₃ for Efficient NO Reduction by CO in the Presence of O₂

Negatively Charged Single-Atom Pt Catalyst Shows Superior SO₂ Tolerance in NO_x Reduction by CO

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Subnanometric Pt on Cu Nanoparticles Confined in Y‐zeolite: Highly‐efficient Catalysts for Selective Catalytic Reduction of NOx by CO

Cited by 20 publications

References 42 publications

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Metal Sites in Zeolites: Synthesis, Characterization, and Catalysis

Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO3 for Efficient NO Reduction by CO in the Presence of O2

Negatively Charged Single-Atom Pt Catalyst Shows Superior SO2 Tolerance in NOx Reduction by CO

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Tailoring the Electronic Structure of Single Ag Atoms in Ag/WO₃ for Efficient NO Reduction by CO in the Presence of O₂

Negatively Charged Single-Atom Pt Catalyst Shows Superior SO₂ Tolerance in NO_x Reduction by CO