Effect of active oxygen on the performance of Pt/CeO 2 catalysts for CO oxidation

Zhou, Anbin; Wang, Jun; Wang, Hui; Li, Hang; Wang, Jianqiang; Shen, Meiqing

doi:10.1016/j.jre.2017.07.008

Cited by 45 publications

(12 citation statements)

References 39 publications

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“…The main diffraction peaks at 28.8°, 33.1°, 47.8°, 56.5°, 59.5°, 69.3°, 77.1° and 79.2° were ascribed to the cubic fluorite cerium oxide and the peaks at 35.4° and 38.7° were attributed to the CuO (JCPDS 34-0394). 32 Except Cu 8 Ag 2 /CeO 2 exhibited the Ag 2 O diffraction peak at 38.2°, no diffraction peaks derived from other metal or metal oxides (Mn, Zn. Ni, Co, Fe) were observed in the XRD patterns.…”

Section: Resultsmentioning

confidence: 94%

The highly efficient removal of HCN over Cu₈Mn₂/CeO₂ catalytic material

Yi¹,

Sun²,

Li³

et al. 2021

RSC Adv.

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Section: Resultsmentioning

confidence: 94%

The highly efficient removal of HCN over Cu₈Mn₂/CeO₂ catalytic material

Yi¹,

Sun²,

Li³

et al. 2021

RSC Adv.

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“…530 °C (observed in the bare support) suggests that the reduction of the CeO2 surface is enclosed in the same event, and indicates an enhancement of the ceria reducibility. For the Pt(-ac)/Ce catalyst, the two sharp contributions are related to reducing platinum species interacting differently with ceria [60], while the peak around 418 °C characterizes the hydrocarbon species generated from the decomposition of acetylacetonate.…”

Section: Chemical Characterizationmentioning

confidence: 99%

Pt-based Catalysts in the Dry Reforming of Methane: Effect of Support and Metal Precursor on the Catalytic Stability

et al. 2021

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Abstract. Platinum catalysts (1.5 wt. %) supported over CeO2 and γ-Al2O3 were synthesized via wet impregnation using two different Pt precursors: H2PtCl6 and Pt(acac)2. Catalysts were tested in the dry reforming of methane (DRM) reaction at stoichiometric conditions (CH4/CO2 molar ratio of 1) with two approaches: as a function of temperature (400-800 °C) and as a function of time on-stream (800 °C / 24 h). Platinum supported over ceria catalysts showed better catalytic properties, especially in the stability tests, where deactivation was almost negligible. In contrast, alumina-supported catalysts stability was considerably lower due to the increased formation of carbon residues and the significant Pt particle sintering after reaction at 800 °C for 24 h. Through different characterization techniques (TEM, CO chemisorption), a strong Pt-Ceria interaction was evidenced, which helped in preventing Pt particle agglomeration under reaction conditions and promoted active interface sites. Both features are proposed to be responsible for the Pt/CeO2 catalysts better catalytic performance. The effect of the Pt precursor depends on the nature of the support. In ceria, Cl species benefited the generation of oxygen vacancies and surface ceria reducibility; both features are responsible for the Pt/CeO2 anti-coke properties, thus impacting positively in the catalytic performance of the Pt(-cl)/Ce sample. Conversely, in alumina, these Cl species triggered particle sintering and carbon deposition during the DRM reaction, affecting the Pt(-cl)/Al catalytic performance. Resumen. Catalizadores de platino (1.5 % en peso) soportados sobre CeO2 y γ-Al2O3 fueron sintetizados mediante impregnación húmeda utilizando dos diferentes precursores de Pt: H2PtCl6 and Pt(acac)2. Los catalizadores fueron evaluados en la reacción de reformado seco de metano (DRM) en condiciones estequiométricas (razón molar de CH4/CO2 igual a 1) y con dos metodologías: en función de la temperatura de reacción (400-800 °C) y en función del tiempo de reacción (800 °C / 24 h). Los catalizadores de platino soportados sobre ceria mostraron las mejores propiedades catalíticas, especialmente en las pruebas de estabilidad, donde la desactivación fue muy baja. Por el contrario, la estabilidad catalítica de las muestras soportadas en alúmina fue considerablemente menor, debido tanto a la formación de residuos de carbón como al sinterizado de partículas de Pt. Por medio diferentes técnicas de caracterización (TEM, Quimisorción de CO), se evidenció una fuerte interacción Pt-Ceria, la cual ayudó a prevenir la aglomeración de partículas de Pt durante la reacción, además de promover la generación de sitios activos interfaciales. Ambas características se proponen como las responsables de las mejores propiedades catalíticas presentadas por los catalizadores Pt/CeO2. El efecto del precursor del Pt depende de la naturaleza del soporte. En ceria, las especies de cloro beneficiaron la generación de sitios vacantes de oxígeno así como la reducción superficial de la ceria; ambas características son responsables de las propiedades anti-coque en el sistema Pt/CeO2, por lo tanto, estas impactaron positivamente en el desempeño catalítico de la muestra Pt(-cl)/Ce. Por el contrario, en la alúmina, estas especies cloradas aparentemente promovieron el sinterizado de partículas y los depósitos de carbono durante la reacción, lo cual afectó el desempeño catalítico de la muestra Pt(-cl)/Al.

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“…To address this challenge, the photothermal catalysts using pollution-free solar energy have attracted great interest in recent years, [2][3][4][5][6] and the light as an ideal external stimulus can efficiently adjust the electronic structure of catalyst to boost the catalytic reactions. CeO 2 -supported Pt catalyst is one of the most widely used supported catalysts, and it has been successfully employed in various reactions such as CO oxidation, [7,8] organic fuel oxidation, [9] watergas shift reaction, [10] and hydrogen generation. [11] Many researchers have contributed their efforts to figure out the catalytic mechanism of Pt/CeO 2 .…”

Section: Introductionmentioning

confidence: 99%

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation

Zhang

Song

et al. 2021

Adv Materials Inter

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Effective catalytic oxidation of toxic emissions at low temperatures has great significance on environmental protection. Herein, a novel structure of Pt/CeO2 catalyst, composed of abundant CeO2 clusters captured by nanoporous Pt particles, is designed to enhance the photo‐thermocatalytic CO oxidation by boosting the amount of active sites. The nanosized CeO2 support is fabricated by vacuum thermal decomposition and then the Pt/CeO2 catalyst with a nanoporous structure is synthesized by a one‐pot solution reduction method in a mild condition. The synthesized catalyst exhibits great low‐temperature CO catalytic oxidation activity, and the temperature for 90% CO conversion is 154 °C, achieving comparable catalytic activity with the single‐atom Pt/CeO2 catalyst. Abundant dual active sites, in terms of active oxygen absorbed on the oxygen vacancies and spillover from ceria to Pt, and active Pt sites located near the perimeter of the Pt–CeO2 interface, are formed to improve the photo‐thermocatalytic activity for CO oxidation.

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Effect of active oxygen on the performance of Pt/CeO 2 catalysts for CO oxidation

Cited by 45 publications

References 39 publications

The highly efficient removal of HCN over Cu₈Mn₂/CeO₂ catalytic material

The highly efficient removal of HCN over Cu₈Mn₂/CeO₂ catalytic material

Pt-based Catalysts in the Dry Reforming of Methane: Effect of Support and Metal Precursor on the Catalytic Stability

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation

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Effect of active oxygen on the performance of Pt/CeO 2 catalysts for CO oxidation

Cited by 45 publications

References 39 publications

The highly efficient removal of HCN over Cu8Mn2/CeO2 catalytic material

The highly efficient removal of HCN over Cu8Mn2/CeO2 catalytic material

Pt-based Catalysts in the Dry Reforming of Methane: Effect of Support and Metal Precursor on the Catalytic Stability

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO2 to Enhance Photo‐Thermocatalytic CO Oxidation

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Product

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The highly efficient removal of HCN over Cu₈Mn₂/CeO₂ catalytic material

The highly efficient removal of HCN over Cu₈Mn₂/CeO₂ catalytic material

Engineering Dual Active Sites at the Interface between Nanoporous Pt and Nanosized CeO₂ to Enhance Photo‐Thermocatalytic CO Oxidation