A temperature programmed reduction study of Pt on Al2O3 and TiO2

Huizinga, T.; Grondelle, van J Joop; Prins, R.

doi:10.1016/0166-9834(84)80104-9

Cited by 137 publications

(90 citation statements)

References 18 publications

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“…For the alumina-supported catalyst, two reduction peaks are evident in good agreement with other TPR reported in the literature [23]. The hydrogen consumption peak at low temperature is due to reduction of Pt oxide particles that do not interact strongly with the alumina, while the high-temperature peak is associated those strongly interacting with it [24]. Decomposition of the Pt precursor that remains after the calcination step may also shift the reduction temperature.…”

Section: Liquid-phase Conversion Of Methyl Stearatesupporting

confidence: 67%

Catalytic Deoxygenation of Methyl-Octanoate and Methyl-Stearate on Pt/Al2O3

et al. 2009

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The deoxygenation of methyl octanoate and methyl stearate over alumina-supported Pt was studied in both the vapor phase in a flow reactor and in the liquid phase in a semibatch reactor. The conversion of both methyl esters resulted in hydrocarbons with one carbon less than the fatty acid of the corresponding ester as the dominant products. In the vapor phase, acid and other oxygenates were observed in low concentrations, but they were not detected when the reaction was conducted in the liquid phase. Under He, condensation products (from esterification and ketonization) were observed. By contrast, under H 2 , mostly paraffins were obtained. These results show promise to directly produce standard diesel components from biodiesel.

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Section: Liquid-phase Conversion Of Methyl Stearatesupporting

confidence: 67%

Catalytic Deoxygenation of Methyl-Octanoate and Methyl-Stearate on Pt/Al2O3

et al. 2009

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“…The reduction peaks on CoOx/SiO2, CoOx/TiO2, and CoOx/Al2O3 can be attributed to the reduction of CoOx to metallic Co [27]. For Pt/CoOx/SiO2, the first peak at 110 °C can be attributed to the reduction of Pt species [28] and the second peak is due to the reduction of CoOx to metallic Co. Two peaks appear for Pt/CoOx/TiO2; the first small peak is contributed to the reduction of Pt species and Co 3+ to Co…”

Section: Pt/mox/sio2 Catalystsmentioning

confidence: 88%

Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3 Catalysts for CO Oxidation

et al. 2015

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Conventional supported Pt catalysts have often been prepared by loading Pt onto commercial supports, such as SiO2, TiO2, Al2O3, and carbon. These catalysts usually have simple metal-support (i.e., Pt-SiO2) interfaces. To tune the catalytic performance of supported Pt catalysts, it is desirable to modify the metal-support interfaces by incorporating an oxide additive into the catalyst formula. Here we prepared three series of metal oxide-modified Pt catalysts (i.e., Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3, where M = Al, Fe, Co, Cu, Zn, Ba, La) for CO oxidation. Among them, Pt/CoOx/SiO2, Pt/CoOx/TiO2, and Pt/CoOx/Al2O3 showed the highest catalytic activities. Relevant samples were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), CO temperature-programmed desorption (CO-TPD), O2 temperature-programmed desorption (O2-TPD), and CO2 temperature-programmed desorption (CO2-TPD).

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“…Surface passivation of reduced metal particles by controlled re-oxidation to create a thin, protective oxide layer. Further oxidation of the bulk is inhibited by diffusion limitation [18]. A quasi-or meta-stable reduced metal phase is maintained below the protection layer.…”

Section: Introductionmentioning

confidence: 99%

Remarks on the passivation of reduced Cu-, Ni-, Fe-, Co-based catalysts

Huber

Lögdberg

et al. 2006

Catal Lett

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Catalysts containing metals such as Cu, Ni, Fe, Co in their reduced state are often subjected to passivation procedures prior to characterization. Passivation with N 2 O or O 2 to create a protective oxide layer also results in a certain degree of sub-surface oxidation. The heat released during oxidation is a critical parameter. The extent of bulk oxidation depends on the type of oxidant as well as on the size of the metal particles, as shown for copper catalysts. The final, meta-stable passivation layer requires a certain thickness to sustain exposure to ambient atmosphere. The encapsulation of metal particles in carbon is an efficient method for preserving the metallic state, as demonstrated for metallic nickel and iron with carbon nanofibers. The use of passivated samples for characterization of the active, i.e., reduced, catalyst has limited value.

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A temperature programmed reduction study of Pt on Al2O3 and TiO2

Cited by 137 publications

References 18 publications

Catalytic Deoxygenation of Methyl-Octanoate and Methyl-Stearate on Pt/Al2O3

Catalytic Deoxygenation of Methyl-Octanoate and Methyl-Stearate on Pt/Al2O3

Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3 Catalysts for CO Oxidation

Remarks on the passivation of reduced Cu-, Ni-, Fe-, Co-based catalysts

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