Propane oxidation with chemically bound oxygen on Pt/TiO2/Al2O3 and Pt/CeO2/Al2O3 catalysts

Sinels’nikov, V. V.; Tolkachev, N. N.; Goryashchenko, S. S.; Telegina, N. S.; Stakheev, A. Yu.

doi:10.1134/s0023158406010150

Cited by 10 publications

(8 citation statements)

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“…A similar mechanism was also presented over other catalyst systems. 56,64 Since ceria supports possess different morphologies and crystal planes, the properties of Pd/CeO 2 catalysts for propane oxidation are affected by the crystal planes of ceria. For instance, the formation energy of oxygen vacancy is varied in the order of (110) < (100) < (111) for ceria, 65 because the…”

Section: T H I S C O N T E N T Imentioning

confidence: 99%

Effect of Ceria Crystal Plane on the Physicochemical and Catalytic Properties of Pd/Ceria for CO and Propane Oxidation

et al. 2016

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Ceria nanocrystallites with different morphologies and crystal planes were hydrothermally prepared, and the effects of ceria supports on the physicochemical and catalytic properties of Pd/CeO 2 for the CO and propane oxidation were examined. The results showed that the structure and chemical state of Pd on ceria were affected by ceria crystal planes. The Pd species on CeO 2 -R (rods) and CeO 2 -C (cubes) mainly formed Pd x Ce 1−x O 2−σ solid solution with −Pd 2+ −O 2− −Ce 4+ − linkage. In addition, the PdO x nanoparticles were dominated on the surface of Pd/CeO 2 -O (octahedrons). For the CO oxidation, the Pd/CeO 2 -R catalyst showed the highest catalytic activity among three catalysts, its reaction rate reached 2.07 × 10 −4 mol g Pd −1 s −1 at 50 °C, in which CeO 2 -R mainly exposed the ( 110) and (100) facets with low oxygen vacancy formation energy, strong reducibility, and high surface oxygen mobility. TOF of Pd/CeO 2 -R (3.78 × 10 −2 s −1 ) was much higher than that of Pd/CeO 2 -C (6.40 × 10 −3 s −1 ) and Pd/CeO 2 -O (1.24 × 10 −3 s −1 ) at 50 °C, and its activation energy (E a ) was 40.4 kJ/mol. For propane oxidation, the highest reaction rate (8.08 × 10 −5 mol g Pd −1 s −1 at 300 °C) was obtained over the Pd/CeO 2 -O catalyst, in which CeO 2 -O mainly exposed the (111) facet. There are strong surface Ce−O bonds on the ceria (111) facet, which favors the existence of PdO particles and propane activation. The turnover frequency (TOF) of the Pd/CeO 2 -O catalyst was highest (3.52 × 10 −2 s −1 ) at 300 °C and its E a value was 49.1 kJ/mol. These results demonstrate the inverse facet sensitivity of ceria for the CO and propane oxidation over Pd/ ceria.

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Section: T H I S C O N T E N T Imentioning

confidence: 99%

Effect of Ceria Crystal Plane on the Physicochemical and Catalytic Properties of Pd/Ceria for CO and Propane Oxidation

et al. 2016

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“…As far as the role of Pt is concerned, it is reported to function as a propane adsorption site. The overall mechanism involves propane adsorption onto the Pt site to form oxidized byproducts and the oxidation of these byproducts by the support [12]. In our case we believe the function of the Rh is similar to that of the Pt.…”

Section: Surface Analysismentioning

confidence: 71%

“…In general catalytic oxidation reactions, the presence of TiO 2 as one of the support constituents leads to improvement in selectivity [11], and higher turnover frequency for the oxidation of the feed [21,22]. For example, a related work on propane oxidation suggests that improvement in selectivity and lower production of intermediate byproduct amounts can be achieved with TiO 2 addition and Pt as the catalyst [12]. This improvement is attributed to the presence of more oxygen-containing support on TiO 2 (TiO 2 , has 2 oxygen atoms per Ti) compared to Al 2 O 3 (which has 1.5 oxygen per Al atom).…”

Section: Surface Analysismentioning

confidence: 97%

“…These properties of the oxides can alter the oxidative mechanism of the primary feed component. The presence of TiO 2 has been reported to produce alkene as byproducts while its absence leads to CO as the major intermediate [12]. As far as the role of Pt is concerned, it is reported to function as a propane adsorption site.…”

Section: Surface Analysismentioning

confidence: 99%

“…Mixed oxide supports in principle may display the beneficial properties of the parent oxides. Indeed, a few reports discuss the application of mixed oxides as supports for catalytic conversion of propane (oxidation [12], dehydrogenation [13]). …”

Section: Introductionmentioning

confidence: 99%

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