Partial oxidation of ethanol on vanadia catalysts on supporting oxides with different redox properties compared to propane

Beck, Benjamin; Harth, Manuel; Hamilton, Neil G.; Carrero, Carlos A.; Uhlrich, John J.; Trunschke, Annette; Shaikhutdinov, Shamil K.; Schubert, H.; Freund, Hans‐Joachim; Schlögl, Robert; Sauer, Joachim; Schomäcker, Reinhard

doi:10.1016/j.jcat.2012.09.008

Cited by 146 publications

(176 citation statements)

References 77 publications

(140 reference statements)

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“…Our conclusion is that the smallest vanadia aggregates lead to activity at the lowest temperature, while polymeric species only show activity at higher temperature. It also varies considerably as we change the nature of the support, that is from ceria to alumina [30], in line with recent catalytic studies on powdered monolayer vanadia catalysts [30]. With this we conclude the discussion of the first example and now turn to the discussion of the influence of dopants within the lattice of simple oxides and their influence on oxygen adsorption.…”

Section: Resultssupporting

confidence: 74%

Model Studies on Heterogeneous Catalysts at the Atomic Scale

2014

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Thin single crystalline oxide films comprise perfect supports to grow nanoparticles of metals and other catalytically relevant materials. The model systems thus created can be thoroughly investigated with respect to structure and/or chemical activity applying both, the techniques of surface science under ultrahigh vacuum conditions as well as the traditional techniques applied in catalysis to study chemical kinetics under ambient conditions. We discuss here in particular the oxidation of methanol to formaldehyde on ceria supported vanadia nanoclusters as well as the effect of transition-metal dopants in single crystalline oxides, such as CaO, on the activation of molecular oxygen

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Section: Resultssupporting

confidence: 74%

Model Studies on Heterogeneous Catalysts at the Atomic Scale

2014

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“…As reported, the apparent activation energy (E a ) indicating the reactivity is consistent with the measured enthalpy of oxygen defect formation [21]. Also, similar correlation was obtained in Lanthanum oxide doped with Cu, Zn, Mg, or Fe [22].…”

Section: Steady-state Ch 3 Oh Oxidationsupporting

confidence: 87%

“…The E a falls within the normal range measured for ODH of propane over the VOx catalysts [25]. As reported, the support material would strongly influence the ODH rate of propane over the supported VOx catalyst, and the order of reactivity is [21]. This order coincides with the increase of Sanderson electro-negativity for the ions building up the support oxides [5].…”

Section: Odh Of Propanesupporting

confidence: 80%

A Comparison of the Redox Properties of Bulk Vanadium Mixed Oxide Catalysts

Wang

Qiu

et al. 2015

Catal Lett

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A series of bulk vanadium mixed oxides (Ce, Al, Fe or Cr) were successfully prepared. Methanol and propane were proposed as probe molecules to investigate the redox properties of this series of bulk vanadium mixed oxides and a qualitative picture of the redox properties was obtained. Specifically, we tested steady-state methanol oxidation at range 250-300°C and oxidative dehydrogenation (ODH) of propane to propene at range 350-550°C. We also explored the turn over frequency of redox products (TOF redox ) and found that the TOF redox values in methanol oxidation and ODH of propane changed in the order as CeVO 4 [ AlVO 4 [ V 2 O 5 [ FeVO 4 [ CrVO 4 . Graphical Abstract

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“…The energy cost to remove lattice oxygen, though not the only factor to explain catalytic activity-e.g., the arrangement of atoms in the active site is also important [87,88]-is a good starting point. Hence, the oxygen defect formation energy is used as a descriptor for the activity of ceria-and vanadia-based catalysts [5,89].…”

Section: Defect Formation Energy and Statistical Thermodynamicsmentioning

confidence: 99%

Oxygen Defects at Reducible Oxide Surfaces: The Example of Ceria and Vanadia

Ganduglia‐Pirovano

2015

Defects at Oxide Surfaces

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Cerium and vanadium oxide-based systems play a major role in a variety of technological applications, with the reducibility of the systems being crucial to their functionality in the applications. The in-depth understanding and control of the type, density, and distribution of oxygen vacancies provide a means to influence the electronic structure and to tailor the systems' functionality. Hence, a great deal of experimental and theoretical work has been devoted to the study of partially reduced ceria and vanadia, both surfaces and bulk. Here, theoretical data for structural and electronic properties and energetic quantities related to the formation and interaction of neutral oxygen vacancies at the CeO 2 (111) and V 2 O 5 (001) surfaces are reviewed, discussed and compared. Experimental findings on oxygen defects in ceria and vanadia are briefly reported. Special attention is given to the fate of the electrons left in the system upon vacancy formation, the vacancy-induced lattice relaxation, whether vacancies agglomerate or repel each other, and the ability of state-of-the-art quantum-mechanical methods to provide an accurate decription of the geometric and electronic structures of the partially reduced oxide systems as well as reliable oxygen defect formation energies. IntroductionReducible metal oxides are extremely functional solid state compounds exhibiting a rich chemistry related to changes of the metal oxidation state [1]. As complex materials such as surfaces, supported particles and films, porous networks, they play a predominant role in applications in advanced technologies like catalysis, sensors, fuel cells, and microelectronics. Point defects in oxides such as vacancies and interstitials account for the transport properties of ionic solids. Defect sites on oxide supports of metal catalyst particles not only act as anchoring and nucleation centers

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Partial oxidation of ethanol on vanadia catalysts on supporting oxides with different redox properties compared to propane

Cited by 146 publications

References 77 publications

Model Studies on Heterogeneous Catalysts at the Atomic Scale

Model Studies on Heterogeneous Catalysts at the Atomic Scale

A Comparison of the Redox Properties of Bulk Vanadium Mixed Oxide Catalysts

Oxygen Defects at Reducible Oxide Surfaces: The Example of Ceria and Vanadia

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