Low-temperature oxidation of methane on Pd-Sn/ZrO2 catalysts

Lovón-Quintana, Juan J.; Santos, João Batista Oliveira dos; Lovón, Adriana S.P.; La-Salvia, Nathália; Valença, Gustavo Paim

doi:10.1016/j.molcata.2015.08.001

Cited by 17 publications

(6 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to several previous studies, the negative peak below 100 °C was corresponded to the H 2 desorption as a result of the decomposition of Pd hydride, [36] such as α-H-Pd, β-H-Pd and γ-H-Pd. [33,37] In addition, the broad and small peak located between 100 °C and 200 °C can be assigned to the reduction of strong absorbed PdO species. [38] Typically, when hydrogen is passed over the Pd supported catalysts at room temperature, hydrogen is consumed rapidly.…”

Section: Tem Observationsmentioning

confidence: 99%

Pd catalyst supported on ZrO₂‐Al₂O₃ by double‐solvent method for methane oxidation under lean conditions

Huang

et al. 2016

Can J Chem Eng

View full text Add to dashboard Cite

The Pd catalyst supported on the Zr 0.5 Al 0.5 O 1.75 composite material was prepared by the conventional impregnation and double solvent impregnation method. The effects of preparation method on the catalytic properties of the Pd/Zr 0.5 Al 0.5 O 1.75 catalyst for methane combustion have been investigated systematically. The measurement was evaluated in a multiple fixed-bed continuous flow micro-reactor by passing a gas mixture simulating the exhaust emissions from lean-burn natural gas vehicles. The as-prepared catalysts were characterized by CO chemical adsorption, transmission electron microscopy (TEM), hydrogen-temperature programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS) measurements. The results of TEM and CO-chemisorption showed that the introduction of double solvent during the preparation of Pd/Zr 0.5 Al 0.5 O 1.75 was beneficial for the dispersion of Pd nanoparticles and obtained superior resistance to the sintering of Pd on the surface of Zr 0.5 Al 0.5 O 1.75 . The H 2 -TPR measurements demonstrated that the double solvent method increased the reducibility of the Pd catalyst. The XPS results further indicated that more active surface oxygen species also can be formed on the catalyst prepared via double solvent process. Thus, this catalyst exhibited better catalytic performance and hydrothermal aging resistance in the methane oxidation compared to its analogues with the same Pd content prepared by the conventional impregnation method. This article is protected by copyright. All rights reserved

show abstract

Section: Tem Observationsmentioning

confidence: 99%

Pd catalyst supported on ZrO₂‐Al₂O₃ by double‐solvent method for methane oxidation under lean conditions

Huang

et al. 2016

Can J Chem Eng

View full text Add to dashboard Cite

show abstract

“…[6][7][8][9] So far, the simple metal oxides, such as CeO 2 , Co 3 O 4 , TiO 2 , ZrO 2 and MnO x , have been extensively studied for their large specic surface area. [10][11][12][13] Whereas in practical applications, metal oxide supported catalysts are unstable aer redox cycling, which results in the deactivation of active Pd species.…”

Section: Introductionmentioning

confidence: 99%

Highly dispersed Pd on macroporous SmMn₂O₅ mullite for low temperature oxidation of CO and C₃H₈

Zhu

Feng

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

The catalytic behavior of a palladium catalyst supported on macroporous SmMn 2 O 5 mullite (Pd/SMO-EG&M) for CO and C 3 H 8 oxidation was measured under lean-burn conditions. Different analytical techniques including XRD, Raman, BET, CO chemisorption, SEM, FTEM, XPS, TPD, TPR and CO + O 2 pulse were undertaken to evaluate its physical and chemical properties. It was concluded that the crystal structure, morphology and specific surface area (SSA) of SmMn 2 O 5 remained unchanged after Pd addition. The Pd/SMO-EG&M exhibited a low complete transformation temperature for CO (105 C) and C 3 H 8 (350 C) oxidation. Such remarkable oxidation activity was attributed to high Pd dispersion (38.4%), which improved the reducibility and mobility of oxygen species, as revealed by TPR and TPD measurements. The high activity of oxygen species for Pd/SMO-EG&M above 250 C accelerated the oxidation capacity as well. In a word, our study indicates that the macroporous Pd-mullite catalyst has potential applications in exhaust purification for gasoline vehicle.

show abstract

“…The performance of Pd‐based catalysts depend not only on the supported active species, but also on the nature of the supports. For example, Pd/ZrO 2 catalyst had high thermal stability, but they showed poor activity due to its irreducibility [11] . SiO 2 ‐supported Pd catalysts had large specific surface area, whereas they exhibited poor hydrothermal stability [12] .…”

Section: Introductionmentioning

confidence: 99%

Exploring the Promotion of γ‐Al₂O₃ on Pd/CeO₂‐Catalyzed Low‐Concentration Methane Oxidation Using Operando DRIFTS‐MS

Dong

et al. 2023

ChemCatChem

View full text Add to dashboard Cite

CeO2/γ‐Al2O3, Pd/CeO2, and Pd/CeO2/γ‐Al2O3 were used for catalyzing low‐concentration CH4 oxidation. It was found that nano‐sized Pd could obviously promote CH4 oxidation on CeO2/γ‐Al2O3. The interaction between Pd and CeO2 on γ‐Al2O3 resulted in higher ratios of Ce3+/(Ce3++Ce4+), Pd2+/(Pd2++Pdδ+), and Oads/(Oads+Olatt), those benefited the formation of more oxygen vacancies and surface reactive oxygen species for CH4 oxidation. γ‐Al2O3 not only supplied a high surface area and enhanced Pd/CeO2 dispersion on γ‐Al2O3, but also simulated the formation of bicarbonate, where bicarbonate is easier to gasify to CO2 than bidentate carbonate that formed on Pd/CeO2. Operando diffuse reflectance infrared Fourier transform spectroscopy‐mass spectrometer analysis results showed that CH4 oxidation could occur at a temperature as low as 180 °C due to the reaction with surface reactive OH, this reaction was also accompanied by the formation of bicarbonate. The mechanism of CH4 oxidation promoted by bicarbonate formation on γ‐Al2O3 was proposed.

show abstract

Low-temperature oxidation of methane on Pd-Sn/ZrO2 catalysts

Cited by 17 publications

References 45 publications

Pd catalyst supported on ZrO₂‐Al₂O₃ by double‐solvent method for methane oxidation under lean conditions

Pd catalyst supported on ZrO₂‐Al₂O₃ by double‐solvent method for methane oxidation under lean conditions

Highly dispersed Pd on macroporous SmMn₂O₅ mullite for low temperature oxidation of CO and C₃H₈

Exploring the Promotion of γ‐Al₂O₃ on Pd/CeO₂‐Catalyzed Low‐Concentration Methane Oxidation Using Operando DRIFTS‐MS

Contact Info

Product

Resources

About

Low-temperature oxidation of methane on Pd-Sn/ZrO2 catalysts

Cited by 17 publications

References 45 publications

Pd catalyst supported on ZrO2‐Al2O3 by double‐solvent method for methane oxidation under lean conditions

Pd catalyst supported on ZrO2‐Al2O3 by double‐solvent method for methane oxidation under lean conditions

Highly dispersed Pd on macroporous SmMn2O5 mullite for low temperature oxidation of CO and C3H8

Exploring the Promotion of γ‐Al2O3 on Pd/CeO2‐Catalyzed Low‐Concentration Methane Oxidation Using Operando DRIFTS‐MS

Contact Info

Product

Resources

About

Pd catalyst supported on ZrO₂‐Al₂O₃ by double‐solvent method for methane oxidation under lean conditions

Pd catalyst supported on ZrO₂‐Al₂O₃ by double‐solvent method for methane oxidation under lean conditions

Highly dispersed Pd on macroporous SmMn₂O₅ mullite for low temperature oxidation of CO and C₃H₈

Exploring the Promotion of γ‐Al₂O₃ on Pd/CeO₂‐Catalyzed Low‐Concentration Methane Oxidation Using Operando DRIFTS‐MS