Carbon Monoxide Oxidation by Polyoxometalate‐Supported Gold Nanoparticulate Catalysts: Activity, Stability, and Temperature‐ Dependent Activation Properties

Yoshida, Takuya; Murayama, Toru; Sakaguchi, Norihito; Okumura, Mitsutaka; Ishida, Tamao; Haruta, Masatake

doi:10.1002/ange.201710424

Cited by 30 publications

(22 citation statements)

References 36 publications

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“…The pioneering work of the Haruta group on supported Au has triggered tremendous interest in low-temperature CO oxidation . Supported Au nanocluster catalysts have shown excellent activity below 0 °C. − However, a cheaper alternative for this reaction is highly desirable. Some metal oxides, especially Co 3 O 4 , are also known to be active for CO oxidation at ambient temperature. − CO oxidation below even −50 °C over Co 3 O 4 has been intensively studied, and varying activities (in terms of T 50 ) have been reported depending on physical properties and reaction conditions. ,,,− The activity in Co 3 O 4 is significantly enhanced by doping with various metal substituents like Fe, Bi, In, etc., although these metals have hardly any role in the redox reaction itself. − These few metal doped Co 3 O 4 catalysts have shown T 100 for CO oxidation at nearly −100 °C.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co₃O₄ Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

et al. 2019

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Co 3 O 4 with spinel structure shows CO oxidation activity at very low temperature under dry conditions. This study aims at finding the origin of the unique catalytic activity of Co species in Co 3 O 4 based oxides. Although, octahedral site Co 3+ species have been reported to be active in Co 3 O 4 based catalysts, there is no solid explanation as to why Co is so special as compared with other metals like Fe having similar redox states. In this study, mainly, three model spinel catalysts including MnCo 2 O 4 , MnFe 2 O 4 , and CoCr 2 O 4 have been chosen. A detailed analysis of bulk and crystal surface structure, surface properties of the catalysts, and redox properties of the active metals has been performed to understand the unusual catalytic activity. Low-temperature CO oxidation activity decreases in the following order: MnCo 2 O 4 ≫ MnFe 2 O 4 > CoCr 2 O 4 . It indicates that the Co 2+ species in a tetrahedral site (in CoCr 2 O 4 ) remains inactive for lowtemperature catalytic activity, while Co 3+ in an octahedral site (in MnCo 2 O 4 ) is active in Co 3 O 4 based catalysts. This result is corroborated with CoFe 2 O 4 which shows a higher activity than CoCr 2 O 4 , as it has partial occupation of the octahedral site. Fe, being a weak redox metal, does not show low-temperature activity, although crystallite facets of MnCo 2 O 4 and MnFe 2 O 4 catalysts are predominantly exposed in the (100) and (110) lattice planes, which contain quite similar concentrations of Co 3+ and Fe 3+ species in both. The intensity of the redox peak for CO oxidation involving a Co 3+ /Co 2+ couple in MnCo 2 O 4 indicates a highly favorable reaction, while a nonresponsive behavior of Co species is observed in CoCr 2 O 4 . As expected, MnFe 2 O 4 is proven to be weak, giving a much lower intensity of electrochemical CO oxidation. Both CO-and H 2 -TPR indicate a much higher reducibility of Co species in MnCo 2 O 4 as compared with Co species in CoCr 2 O 4 or Fe in MnFe 2 O 4 .

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Section: Introductionmentioning

confidence: 99%

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co₃O₄ Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

et al. 2019

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“…As shown in Figure and Figure S5, the absorption bands observed at ṽ = 2099 cm –1 on Au/TT-Ta 2 O 5 , ṽ = 2106 cm –1 on Au/P-Ta 2 O 5 , ṽ = 2101 cm –1 on Au/T-Ta 2 O 5 , and ṽ = 2093 cm –1 on Au/TiO 2 can be assigned to CO adsorbed on Au 0 . The bands at 2121 and 2133 cm –1 on Au/TT-Ta 2 O 5 and the band at 2120 cm –1 on Au/P-Ta 2 O 5 can be assigned to CO adsorbed on Au δ+ . ,, In the range of 2140 to 2200 cm –1 , the absorption bands of CO adsorbed on the Ta 2 O 5 sites and Au + were probably overlapped. It has been reported that the gold atoms at the perimeter interface showed Au δ+ and/or Au + characters. , The presence of Au + and/or Au δ+ suggested that the effective interaction between gold nanoparticles and the support was formed.…”

Section: Resultsmentioning

confidence: 92%

“…Au/Ta 2 O 5 was prepared by the SI method. , A solution of thiolate-protected gold colloids dissolved in 20 mL of toluene was added dropwise into a solution of Ta 2 O 5 dispersed in 10 mL of toluene. The mixture was stirred at room temperature for 1 h, and the solvent was evaporated under reduced pressure at 40 °C.…”

Section: Experimental Sectionmentioning

confidence: 99%

Elucidation of Active Sites of Gold Nanoparticles on Acidic Ta₂O₅ Supports for CO Oxidation

Lin

Mochizuki

et al. 2020

ACS Catal.

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Gold nanoparticles of small sizes with a highly uniform dispersion were successfully deposited on several crystalline forms of Ta 2 O 5 (pseudohexagonal, orthorhombic, and pyrochlore) by the sol immobilization method. The pseudohexagonal Ta 2 O 5 (TT-Ta 2 O 5 ) synthesized by a hydrothermal method showed the highest catalytic activity for CO oxidation as a support for gold catalysts. The temperature at 50% CO conversion was −11 °C for 1 wt % Au/ TT-Ta 2 O 5 , and the temperature was 23 °C at 100% CO conversion (space velocity of 20000 mL h −1 g cat −1). To investigate the reaction mechanism, in situ diffuse reflectance infrared Fourier transform spectroscopy for Au/TT-Ta 2 O 5 was performed, and the sequential delivery of adsorbed CO on Ta 2 O 5 sites and Au sites to the active sites was observed at −120 °C. The results of temperatureprogrammed CO reduction suggested that the oxygen adsorbed at −100 °C contributed mainly to the high catalytic activity of CO oxidation, while the lattice oxygen played a minor role for CO oxidation from −60 to 100 °C, which was the same temperature range with the actual reaction condition.

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“…There are several studies concerning the CO oxidation of different metals and supports, as reported in the review by Lui and Corma [2]. In fact, the catalytic oxidation of CO is the most effective process, as reported in the literature [3] [4] [5] [6] [7], using predominantly alumina-support and noble metals (Pt, Ru, Rh, and Pd) [8]- [13] and zeolite-supported platinum [13] [14] [15]. The met- [27].…”

Section: Introductionmentioning

confidence: 99%

Ruthenium Catalyst Supported on Multi-Walled Carbon Nanotubes for CO Oxidation

Kozonoe

Giudici

Schmal

2021

MRC

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This work proposes the synthesis of the 5%wt Ru on MWCNT catalyst and the influence of feed rate and testing variables for low-temperature oxidation affecting the CO 2 yield. Morphology and incorporation of the nanoparticles in carbon nanotubes were investigated by specific surface area (BET method); thermogravimetric analyses (TGA); X-ray diffraction; Raman spectroscopy, transmission electron microscopy (TEM) and XPS. The conversions of CO and O 2 were mostly 100% in groups C1 and C2 (temperature between 200 and 500˚C with low WHSV). In order to assess the effect of mass on catalytic activity, condition C3 was tested at even lower temperatures. In the tested catalyst, high activity (100% CO and O 2 conversion) was observed, keeping it active under reaction conditions, suggesting oxi-reduction of the RuO 2 at surface without affecting the MWCNT but Lewis acid influencing the CO 2 yield.

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Carbon Monoxide Oxidation by Polyoxometalate‐Supported Gold Nanoparticulate Catalysts: Activity, Stability, and Temperature‐ Dependent Activation Properties

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 30 publications

References 36 publications

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co₃O₄ Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co₃O₄ Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

Elucidation of Active Sites of Gold Nanoparticles on Acidic Ta₂O₅ Supports for CO Oxidation

Ruthenium Catalyst Supported on Multi-Walled Carbon Nanotubes for CO Oxidation

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Carbon Monoxide Oxidation by Polyoxometalate‐Supported Gold Nanoparticulate Catalysts: Activity, Stability, and Temperature‐ Dependent Activation Properties

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 30 publications

References 36 publications

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co3O4 Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co3O4 Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

Elucidation of Active Sites of Gold Nanoparticles on Acidic Ta2O5 Supports for CO Oxidation

Ruthenium Catalyst Supported on Multi-Walled Carbon Nanotubes for CO Oxidation

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Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co₃O₄ Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

Ultra-Low-Temperature CO Oxidation Activity of Octahedral Site Cobalt Species in Co₃O₄ Based Catalysts: Unravelling the Origin of the Unique Catalytic Property

Elucidation of Active Sites of Gold Nanoparticles on Acidic Ta₂O₅ Supports for CO Oxidation