Mn-promoted Ag supported on pure siliceous Beta zeolite (Ag/Beta-Si) for catalytic combustion of formaldehyde

Zhang, Ling; Xie, Yuan; Jiang, Yiwen; Wang, Qianqian; Han, Shichao; Luan, Huimin; Meng, Xiangju; Xiao, Feng‐Shou

doi:10.1016/j.apcatb.2019.118461

Cited by 39 publications

(24 citation statements)

References 57 publications

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“…The transformation of surface oxygen species among different electronic states (O 2 → O 2 – → 2O – → O 2– ) would occur simultaneously . The optimal loading of sliver can ensure the dispersibility and a higher exposure of surface Ag sites . The formation of O 2 – , which shows a higher soot combustion activity different from those of the O – and O 2– species, can be promoted by the incorporation of a proper amount of Ag. , The addition of Ag promotes more conversion of Mn 4+ to Mn 3+ and the formation of [V o ] (reaction ), which accelerates the formation of O x n – (reaction ).…”

Section: Resultsmentioning

confidence: 99%

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO₂ for Soot Oxidation: Experimental and DFT Studies

Wang

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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The hydrothermal method was used to synthesize α-MnO 2 with nanoflower-like (NF) and nanowire-like (NW) morphologies. Besides, different amounts (5−15 wt %) of silver were loaded into flowerlike α-MnO 2 (Ag(x)-NF) to promote the soot oxidation performance. The resulting catalysts have been characterized by different techniques. Soot oxidation was detected over temperature-programmed experiments. Unequal surface oxygen vacancies in different α-MnO 2 result in different O x n− generating capacities, as shown in the X-ray photoelectron spectroscopy (XPS) test. The NF had the highest ratio of highly reactive superoxide (O 2 − ). In addition, the NF modified by optimal amounts of Ag could speed up the O 2 − generation caused by the largest amount of surface oxygen vacancies. The density functional theory calculation revealed that the oxygen vacancies on α-MnO 2 species could improve the adsorption of reactants and increase the surface energy of the asprepared catalyst, which result in excellent catalytic performance of Ag(10)-NF.

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Section: Resultsmentioning

confidence: 99%

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO₂ for Soot Oxidation: Experimental and DFT Studies

Wang

Zhang

et al. 2020

Ind. Eng. Chem. Res.

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“…They have a regular network structure. Metal-zeolite composites are widely used in thermocatalysis ( Zhang et al, 2020a ) and dehydrogenation/hydrogenation ( Liu et al, 2019a ). Metal-zeolite composites have been extensively researched and successfully prepared by a variety of methods, such as postencapsulation methods, in situ encapsulation methods or zeolite-shell-encaged methods ( Kosinov et al, 2018 ; Wang et al, 2019a ).…”

Section: Single Atoms Confined In Zeolitesmentioning

confidence: 99%

“…], metal organic frameworks (MOF) ( Otake et al, 2018 ; Zhang et al, 2019a ), Ti 3 C 2 T x MXene nanosheets ( Bao et al, 2021 ), carbon materials [graphene (RGO) ( Chen et al, 2019 ), carbon nanotubes (CNT) ( Cheng et al, 2019 ) and carbon nitride (CN) ( Chen et al, 2018 ) etc.] and zeolites ( Fang et al, 2020 ; Zhang et al, 2020a ) and so on.…”

Section: Introductionmentioning

confidence: 99%

Porous Materials Confining Single Atoms for Catalysis

et al. 2021

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In recent years, single-atom catalysts (SACs) have received extensive attention due to their unique structure and excellent performance. Currently, a variety of porous materials are used as confined single-atom catalysts, such as zeolites, metal-organic frameworks (MOFs), or carbon nitride (CN). The support plays a key role in determining the coordination structure of the catalytic metal center and its catalytic performance. For example, the strong interaction between the metal and the carrier induces the charge transfer between the metal and the carrier, and ultimately affects the catalytic behavior of the single-atom catalyst. Porous materials have unique chemical and physical properties including high specific surface area, adjustable acidity and shape selectivity (such as zeolites), and are rational support materials for confined single atoms, which arouse research interest in this field. This review surveys the latest research progress of confined single-atom catalysts for porous materials, which mainly include zeolites, CN and MOFs. The preparation methods, characterizations, application fields, and the interaction between metal atoms and porous support materials of porous material confined single-atom catalysts are discussed. And we prospect for the application prospects and challenges of porous material confined single-atom catalysts.

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“…More recently, Ag-based catalysts have been taken into consideration because silver is significantly cheaper than other metals (Pt, Pd and Au) and shows high catalyst activities for HCHO oxidation at low temperatures [14,15]. For example, 10%Ag/Beta-Si can oxidize HCHO (80 ppm) completely to CO2 and H2O at around 70°C, or 8%Ag/TiO2 can reach 100% conversion of HCHO (110 ppm) at about 95°C [16,17]. Since the amount of noble metal used as a catalyst is minimal, they need a support to maintain their good performance.…”

Section: Introductionmentioning

confidence: 99%

Catalytic oxidation of formaldehyde over silver supported on ZSM-5: The role of Ag and mesopores

Luon

Long

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Silver nanoparticles (AgNPs) are increasingly drawing a great deal of attention because of their exclusive properties and a huge variety of applications. In recent years, using AgNPs supported on various carriers as heterogeneous catalysts has become promising for treating some toxic gases in the environment, such as HCHO. This study has successfully synthesized AgNPs onto ZSM-5 microporous zeolite and ZSM-5 mesopore-modified zeolite (Meso-ZSM-5) by ion-exchange method using sodium borohydride as a reducing agent. The resulting catalysts were then characterized by N2 adsorption-desorption method. In order to evaluate HCHO adsorption, desorption, and the surface reaction of these catalysts, temperature-programmed desorption (TPD) and temperature-programmed surface reaction (TPSR) were employed. The TPD and TPSR experiments were conducted with different relative humidity. The results showed that Ag/Meso-ZSM-5 exhibited higher catalyst activity in HCHO complete oxidation than Ag/ZSM-5 at high temperatures because of a new larger pore system within the zeolite. Furthermore, TPD and TPSR experiments provided an explanation for the poor performance of the catalysts at low temperatures, which was associated with the high adsorption capacity of the zeolite.

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Mn-promoted Ag supported on pure siliceous Beta zeolite (Ag/Beta-Si) for catalytic combustion of formaldehyde

Cited by 39 publications

References 57 publications

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO₂ for Soot Oxidation: Experimental and DFT Studies

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO₂ for Soot Oxidation: Experimental and DFT Studies

Porous Materials Confining Single Atoms for Catalysis

Catalytic oxidation of formaldehyde over silver supported on ZSM-5: The role of Ag and mesopores

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Mn-promoted Ag supported on pure siliceous Beta zeolite (Ag/Beta-Si) for catalytic combustion of formaldehyde

Cited by 39 publications

References 57 publications

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO2 for Soot Oxidation: Experimental and DFT Studies

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO2 for Soot Oxidation: Experimental and DFT Studies

Porous Materials Confining Single Atoms for Catalysis

Catalytic oxidation of formaldehyde over silver supported on ZSM-5: The role of Ag and mesopores

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Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO₂ for Soot Oxidation: Experimental and DFT Studies

Promoting the Generation of Active Oxygen over Ag-Modified Nanoflower-like α-MnO₂ for Soot Oxidation: Experimental and DFT Studies