CO Oxidation Catalyzed by Ag Nanoparticles Supported on SnO/CeO<sub>2</sub>

Khan, Inayat Ali; Sajid, Nida; Badshah, Amin; Wattoo, Muhammad Hamid Sarwar; Anjum, Dalaver H.; Nadeem, Muhammad Arif

doi:10.5935/0103-5053.20150028

Cited by 4 publications

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“…In the literature, high-temperature activity due to silver was reported using 2.0 wt.% at 220 • C. Usually, catalytic activity of silver based catalysts depends on the surface architecture (related to gas transport), preparation method and pre-treatment conditions and medium (which influence the catalyst structure and electronic states, for example, through hydrogen reduction followed by oxidation). The activity may decrease due to the increase in the particle size, in which further decrease partially coordinated the active surface sites [27] in SLOAL as compared to RUOAL. Additionally, it showed that increasing silver loading increased the conversion percentage up to certain value and beyond that it tend to decrease [28,29].…”

Section: The Co Oxidation Performance Of the Catalystsmentioning

confidence: 99%

Preparation, Characterization and CO Oxidation Performance of Ag2O/γ-Al2O3 and (Ag2O+RuO2)/γ-Al2O3 Catalysts

2020

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This research dealt with the preparation and characterization of silver oxide (SLO) nanomaterials (NMs) and their composite catalysts (i.e., silver and ruthenium oxide (SLORUO)). The prepared materials were tested for their catalytic performance in carbon monoxide (CO) oxidation. Generally, silver in its pure state is not widely used for CO oxidation due to stability and structural issues. However, the usage of subsurface oxygen and oxygen-induced reconstruction could be effective as an oxidation catalyst at a slightly high temperature. The low-temperature reaction of highly active RuO2 (RUO) is a well-known phenomenon. Thus, the possibility of using it with SLO to observe the combined catalytic behavior was investigated. The wet chemically prepared SLO and SLORUO NMs exhibited spherical and rods in spherical aggregate-type surface morphology belonging to cubic and rutile crystalline structures, respectively. The NMs and catalysts (i.e., the NMs on γ-Al2O3 catalyst support at 0.5 and 1.0 wt.% ranges) showed good thermal stability. The dry and wet CO oxidation using RUO and SLO showed concentration-dependent catalytic activity. The RUO, SLO, and SLORUO composites using 0.5 wt.% showed full CO oxidation at 200, 300, and 225 °C, respectively. The reasons for the observed activity of the catalysts are explained based on the pore characteristics, chemical composition, and dispersion using H2 temperature-programmed reduction (TPR) behaviors.

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Section: The Co Oxidation Performance Of the Catalystsmentioning

confidence: 99%

Preparation, Characterization and CO Oxidation Performance of Ag2O/γ-Al2O3 and (Ag2O+RuO2)/γ-Al2O3 Catalysts

2020

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“…The samples using DRS-UV showed presence of isolated Ti 4+ species corresponding to tetrahedral coordination 27 and Ag NPs, exhibited presence of three kinds of Ag species indicating the variation in coordination environments. 28 SEM and TEM morphology of TiO 2 and Ag NPs showed irregular shape and size 29 and agglomeration of nanoparticles with distribution of small spherical nanoparticles (10-30 nm), 30 respectively. Broth dilution method was used to evaluate the toxicity of a synthesized TiO 2 and Ag NPs to bacterial cells and hence the susceptibility of the cells in this mixture.…”

Section: Discussionmentioning

confidence: 95%

UsingFomitopsis pinicolafor bioinspired synthesis of titanium dioxide and silver nanoparticles, targeting biomedical applications

et al. 2020

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“…Due to the unique surface properties and practically similar ionic radii of K + and Ag + [33], providing the opportunity for K + substitution in the K-OMS-2 tunnels by silver ions, the Ag addition on the MnO 2 surface is thought to be an effective means to improve the catalytic oxidation efficiency of the catalyst. Silver is known as an attractive catalyst for many heterogeneous catalytic oxidation reactions, such as the oxidation of CO at ambient temperature [34,35], formaldehyde [36,37], and benzene [38], the combustion of mobilederived pollutants [39], and the oxidation of alcohols [35,40,41], etc. The performance of silver-based catalysts depends on their surface structure and composition, thus, it can be modulated by different Ag-O interactions [42].…”

Section: Introductionmentioning

confidence: 99%

“…and synergistic action with a large number of promoters and modifiers (noble metals, transition metal oxides, halogen-containing compounds, etc.) [41,43].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect in Ag/Fe–MnO2 Catalysts for Ethanol Oxidation

et al. 2022

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Here we report the synergistic effect of OMS-2 catalysts tested in ethanol oxidation, and the effects produced by both the addition of an Fe modifier in the catalyst preparation stage, and the introduction of Ag on its surface by the impregnation method. To analyze the action of each component, the Fe-modified, Ag-containing OMS-2 catalysts with different Mn/Fe ratios were prepared. Combined XPS and XRF elemental analysis confirms the states and distribution of the Ag- and Fe-containing species between the surface and bulk of the OMS-2 catalysts, which form highly dispersed Ag species on the surface of 0.05Fe–OMS-2, and are also incorporated into the OMS-2 crystalline lattice. The cooperative action of Ag and Fe modifiers improves both reoxidation ability (TPO results) and the amount of adsorbed oxygen species on the catalyst surface. The introduction of Ag to the OMS-2 and 0.05 Fe–OMS-2 surface allows a high level of activity (T80 = 150–155 °C) and selectivity (SAc80 = 93%) towards the acetaldehyde formation.

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CO Oxidation Catalyzed by Ag Nanoparticles Supported on SnO/CeO₂

Cited by 4 publications

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Preparation, Characterization and CO Oxidation Performance of Ag2O/γ-Al2O3 and (Ag2O+RuO2)/γ-Al2O3 Catalysts

Preparation, Characterization and CO Oxidation Performance of Ag2O/γ-Al2O3 and (Ag2O+RuO2)/γ-Al2O3 Catalysts

UsingFomitopsis pinicolafor bioinspired synthesis of titanium dioxide and silver nanoparticles, targeting biomedical applications

Synergistic Effect in Ag/Fe–MnO2 Catalysts for Ethanol Oxidation

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CO Oxidation Catalyzed by Ag Nanoparticles Supported on SnO/CeO2

Cited by 4 publications

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Preparation, Characterization and CO Oxidation Performance of Ag2O/γ-Al2O3 and (Ag2O+RuO2)/γ-Al2O3 Catalysts

Preparation, Characterization and CO Oxidation Performance of Ag2O/γ-Al2O3 and (Ag2O+RuO2)/γ-Al2O3 Catalysts

UsingFomitopsis pinicolafor bioinspired synthesis of titanium dioxide and silver nanoparticles, targeting biomedical applications

Synergistic Effect in Ag/Fe–MnO2 Catalysts for Ethanol Oxidation

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CO Oxidation Catalyzed by Ag Nanoparticles Supported on SnO/CeO₂