Pt and Ir supported on mixed Ce0.97Ru0.03O2 oxide as low-temperature CO oxidation catalysts

Rangel, R.; Gonzalez-A, E.; Solis-Garcia, Alfredo; Zepeda, T.A.; Galván, D. H.; Gómez-Cortés, Antonio; Díaz, Gabriela

doi:10.1016/j.cattod.2021.03.017

Cited by 10 publications

(3 citation statements)

References 58 publications

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“…Carbon monoxide is a harmful pollutant [1][2][3], especially indoors or inside vehicle cabins, and many efforts have been devoted to oxidize CO to CO 2 at low temperatures. Au and Pt-based catalysts are particularly active at room temperature, and promoted by the presence of moisture [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

et al. 2022

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A large signal of gas-phase CO overlapping with those of adsorbates is often present when investigating catalysts by operando diffuse reflectance FT-IR spectroscopy. Physically removing CO(g) from the IR cell may lead to a fast decay of adsorbate signals. Our work shows that carbonyls adsorbed on metallic Pt sites fully vanished in less than 10 min at 30 °C upon removing CO(g) when redox supports were used. In contrast, a broad band assigned to CO adsorbed on oxidized Pt sites was stable. It was concluded that physically removing CO(g) at room temperature during IR analyses will most likely lead to changes in the distribution of CO(ads) and a misrepresentation of the Pt site speciation, misguiding the development of efficient low-temperature CO oxidation catalysts. A tentative representation of the nature of the Pt phases present depending on the feed composition is also proposed.

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Section: Introductionmentioning

confidence: 99%

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

et al. 2022

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“…As a result of electron interactions between the active metal and the nano-structured support, the crystallite size of the noble metal is significantly reduced and the activity of the catalyst is increased [37]. In the case of the oxidation of CO, the temperature at which a 100% conversion of CO is achieved drops significantly [38,39].…”

Section: Introductionmentioning

confidence: 99%

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

et al. 2022

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A porous TiO2 layer was prepared with the plasma electrolytic oxidation (PEO) of Ti. In a further step, Pd was deposited on the TiO2 surface layer using the adsorption method. The activity of the Pd/TiO2/Ti catalyst was investigated during the oxidation of CO to CO2 in a mixture of air with 5% CO. The structure of the catalytic active layer was studied using a scanning electron microscope equipped with an energy dispersive spectrometer (SEM-EDS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray diffraction (XRD). The PEO process provided a porous TiO2 layer with a uniform thickness in the range of 5–10 µm, which is desirable for the production of Pd-supported catalysts. A TOF-SIMS analysis showed the formation of Pd nanoparticles after the adsorption treatment. The conversion of CO to CO2 in all samples was achieved at 150–280 °C, depending on the concentration of Pd. The composition of Pd/ TiO2/Ti was determined using ICP-MS. The optimum concentration of Pd on the surface of the catalyst was approximately 0.14% wt. This concentration was obtained when a 0.4% PdCl2 solution was used in the adsorption process. Increasing the concentration of PdCl2 did not lead to a further improvement in the activity of Pd/ TiO2/Ti.

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“…((1) 0.75CeO 2 /0.5CuO/3DOM SiO 2 , (2) 0.5CeO 2 /0.5CuO/3DOM SiO 2 , (3) 0.5CeO 2 / 0.25CuO/3DOM SiO 2 , (4) 0.25CeO 2 /0.25CuO/3DOM SiO 2 , (5) 1CeO 2 /3DOM SiO 2 , (6) 1CuO/3DOM SiO 2 , (7) 0.25CeO 2 /0.5CuO/3DOM SiO 2 , (8) 0.75CeO 2 /0.25CuO/3DOM SiO 2 ). The comparison of CO catalytic oxidation performance of different nanostructured materials (c) T 100% and (d) T 90% 3,19,24,[51][52][53][54][55][56][57].…”

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confidence: 99%

CeO₂/CuO/3DOM SiO₂ catalysts with very high efficiency and stability for CO oxidation

et al. 2022

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Pt and Ir supported on mixed Ce0.97Ru0.03O2 oxide as low-temperature CO oxidation catalysts

Cited by 10 publications

References 58 publications

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

CeO₂/CuO/3DOM SiO₂ catalysts with very high efficiency and stability for CO oxidation

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Pt and Ir supported on mixed Ce0.97Ru0.03O2 oxide as low-temperature CO oxidation catalysts

Cited by 10 publications

References 58 publications

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO

CO Oxidation over Pd Catalyst Supported on Porous TiO2 Prepared by Plasma Electrolytic Oxidation (PEO) of a Ti Metallic Carrier

CeO2/CuO/3DOM SiO2 catalysts with very high efficiency and stability for CO oxidation

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Product

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CeO₂/CuO/3DOM SiO₂ catalysts with very high efficiency and stability for CO oxidation