Calcination temperature effects on Pd/alumina catalysts: Particle size, surface species and activity in methane combustion

Fertal, Domenica R.; Monai, Matteo; Proaño, Laura; Bukhovko, Maxim P.; Park, Jihyeon; Ding, Y.; Weckhuysen, Bert M.; Banerjee, Anil Chandra

doi:10.1016/j.cattod.2021.08.005

Cited by 25 publications

(18 citation statements)

References 53 publications

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“…This revealed that PdO and Pd 0 species co-existed in all of them. These results are in good accordance with Fertal’s report . In fact, PdO, metallic Pd, and Pd/PdO mixed phase were proposed as active centers for the complete oxidation of methane .…”

Section: Resultssupporting

confidence: 92%

Ordered Mesoporous Pd-La/Al₂O₃ Catalysts for Enhanced Methane Combustion

et al. 2022

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A set of Pd-M-Al (M = Ce, La, Y, Ni, and Mg) composite oxides with an ordered mesoporous structure were obtained, and the influence of the promoters on the catalytic properties of 1%Pd/Al2O3 was investigated for the catalytic combustion of methane. The samples were characterized using multiple techniques. The results indicated that the addition of promoters has little impact on the morphology of the ordered mesoporous Al2O3 framework and Al3+ coordination environments. Among the catalysts, the ordered mesoporous 1%Pd-La/Al2O3 catalyst showed an excellent activity with a T 90 of 420 °C at 18 L/(g·h) and catalytic stability without notable deactivation for 2000 min, compared with the 1%Pd/Al2O3. The outstanding catalytic performance is mainly related to the stabilization of PdO by La2O3 in the confined mesoporous skeleton of the catalyst.

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Section: Resultssupporting

confidence: 92%

Ordered Mesoporous Pd-La/Al₂O₃ Catalysts for Enhanced Methane Combustion

et al. 2022

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“…The authors proposed two hypotheses to explain the relationship between the TOF and Pt particle size: (1) when metallic Pt was the only active site, the volcano shape of the TOF–Pt particle size curve was ascribed to the competition between the reduction of the chemical potential of active centers and increment of Pt 0 /PtO 2 ratios as the particle size increased; (2) when both Pt and PtO 2 were active sites, the volcano shape of the TOF–Pt particle size curve originated from the changes in the Pt 0 /PtO 2 ratios. Similar results were also observed on Pt-based catalysts and Pd-based catalysts. − The relationship between catalytic activity and Pd size was also influenced by the type of support. As shown in Figure , Murata et al found that Pd-based catalysts loaded on α-Al 2 O 3 and θ-Al 2 O 3 exhibited a volcano-shaped dependence, with an optimal particle size of 7 nm, while those on γ-Al 2 O 3 showed a continuous increase, which was due to the strong interaction between Pd and γ-Al 2 O 3 .…”

Section: Catalystssupporting

confidence: 71%

Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

et al. 2022

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Catalytic combustion of methane is a promising way of eliminating fugitive methane emissions to meet the rising requirement of the wide application of natural gas vehicles. The performance of catalysts for methane combustion has been found to be significantly affected by the variety of lattice defects, oxygen vacancies, and metal−support interactions which are connected with the category, morphology, and crystal type of both active components and supports. Choices of additives and preparation methods also play important roles in the catalytic combustion of methane. In this Review, we highlight the recent progress in the development and understanding of catalytic combustion of methane. Distinct mechanisms regarding catalytic combustion of methane, including the Langmuir−Hinshelwood mechanism, the Eley−Rideal mechanism, and the Mars−van Krevelen mechanism, are first discussed. The effects of active components, supports, additives, and preparation methods on the properties of catalysts for methane combustion are then analyzed. From a practical point of view, the effects of the components of exhaust gas, which include carbon dioxide, water, sulfur compounds, and nitrogencontaining compounds, are also discussed. Finally, we provide a summary regarding the current situation and future prospects for the catalytic combustion of methane.

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“…X-ray fluorescence (XRF) analysis revealed 15.7 wt% Ni loading on Al2O3-ZrO support for Ni/Al2O3-ZrO and 16.45 wt% Ni loading on SiO2-ZrO2 support for Ni/SiO2-ZrO2. The slight wt% Ni increment which differs from the theoretical calculations is attributed to Al2O3-ZrO2 and SiO2-ZrO2 support weight loss due to calcination at 500 °C for 5 h before Ni impregnation similarly in a report by Fertal et al [28]. The crystallite size of nickel was determined from the XRD data using Scherrer's equation (Table 1).…”

Section: Catalyst Characterizationsmentioning

confidence: 69%

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

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Novitasari

et al. 2021

Bull. Chem. React. Eng. Catal.

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Hydrodeoxygenation (HDO) is applied in fuel processing technology to convert bio-oils to green diesel with metal-based catalysts. The major challenges to this process are feedstock, catalyst preparation, and the production of oxygen-free diesel fuel. In this study, we aimed to synthesize Ni catalysts supported on silica-zirconia and alumina-zirconia binary oxides and evaluated their catalytic activity for waste cooking oil (WCO) hydrodeoxygenation to green diesel. Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 were synthesized by wet-impregnation and hydrodeoxygenation of WCO was done using a modified batch reactor. The catalysts were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy - energy dispersive X-ray spectroscopy (SEM-EDS), and N2 isotherm adsorption-desorption analysis. Gas chromatography - mass spectrometry (GC-MS) analysis showed the formation of hydrocarbon framework n-C15 generated from the use of Ni/Al2O3-ZrO2 with the selectivity of 68.97% after a 2 h reaction. Prolonged reaction into 4 h, decreased the selectivity to 58.69%. Ni/SiO2-ZrO2 catalyst at 2 h showed selectivity of 55.39% to n-C15. Conversely, it was observed that the reaction for 4 h increased selectivity to 65.13%. Overall, Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2 catalysts produced oxygen-free green diesel range (n-C14-C18) enriched with n-C15 hydrocarbon. Reaction time influenced the selectivity to n-C15 hydrocarbon. Both catalysts showed promising hydrodeoxygenation activity via the hydrodecarboxylation pathway. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Calcination temperature effects on Pd/alumina catalysts: Particle size, surface species and activity in methane combustion

Cited by 25 publications

References 53 publications

Ordered Mesoporous Pd-La/Al₂O₃ Catalysts for Enhanced Methane Combustion

Ordered Mesoporous Pd-La/Al₂O₃ Catalysts for Enhanced Methane Combustion

Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

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Calcination temperature effects on Pd/alumina catalysts: Particle size, surface species and activity in methane combustion

Cited by 25 publications

References 53 publications

Ordered Mesoporous Pd-La/Al2O3 Catalysts for Enhanced Methane Combustion

Ordered Mesoporous Pd-La/Al2O3 Catalysts for Enhanced Methane Combustion

Catalytic Combustion of Methane: From Mechanism and Materials Properties to Catalytic Performance

The Production of Green Diesel Rich Pentadecane (C15) from Catalytic Hydrodeoxygenation of Waste Cooking Oil using Ni/Al2O3-ZrO2 and Ni/SiO2-ZrO2

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Ordered Mesoporous Pd-La/Al₂O₃ Catalysts for Enhanced Methane Combustion

Ordered Mesoporous Pd-La/Al₂O₃ Catalysts for Enhanced Methane Combustion