Evaluation of Rh/Ce x Ti 1−x O 2 catalysts for synthesis of oxygenates from syngas using XPS and TPR techniques

Sheerin, Ephraim; Reddy, Gunugunuri K.; Smirniotis, Panagiotis G.

doi:10.1016/j.cattod.2015.07.050

Cited by 46 publications

(27 citation statements)

References 31 publications

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“…The Ce/Al 2 O 3 catalyst did not exhibit noticeable 3d peaks that are associated with CeO 2 , likely due to the low surface distribution. Mg-Ce/Al 2 O 3 (I) and Mg-Ce/Al 2 O 3 (II), however, exhibited well-developed 3d peaks from the Ce 4+ oxides [41]. The surface content of CeO 2 (0.67 wt %) on Mg-Ce/Al 2 O 3 (I) was greater (0.40 wt %) relative to Ce/Al 2 O 3 only ( …”

Section: Introductionmentioning

confidence: 99%

Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

Chen

Yoza

et al. 2017

Catalysts

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Abstract:The use of catalytic ozonation processes (COPs) for the advanced treatment of recalcitrant petroleum refinery wastewater (RPRW) is rapidly expanding. In this study, magnesium (Mg), cerium (Ce), and Mg-Ce oxide-loaded alumina (Al 2 O 3 ) were developed as cost efficient catalysts for ozonation treatment of RPRW, having performance metrics that meet new discharge standards. Interactions between the metal oxides and the Al 2 O 3 support influence the catalytic properties, as well as the efficiency and mechanism. Mg-Ce/Al 2 O 3 (Mg-Ce/Al 2 O 3 -COP) reduced the chemical oxygen demand by 4.7%, 4.1%, 6.0%, and 17.5% relative to Mg/Al 2 O 3 -COP, Ce/Al 2 O 3 -COP, Al 2 O 3 -COP, and single ozonation, respectively. The loaded composite metal oxides significantly increased the hydroxyl radical-mediated oxidation. Surface hydroxyl groups (-OHs) are the dominant catalytic active sites on Al 2 O 3 . These active surface -OHs along with the deposited metal oxides (Mg 2+ and/or Ce 4+ ) increased the catalytic activity. The Mg-Ce/Al 2 O 3 catalyst can be economically produced, has high efficiency, and is stable under acidic and alkaline conditions.

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Section: Introductionmentioning

confidence: 99%

Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

Chen

Yoza

et al. 2017

Catalysts

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“…The observed shift in Ce and Ti signals suggests an interaction between both components. Sheerin et al prepared mixed Ce–Ti oxides containing different Ce and Ti loadings, and a similar shift in Ti signal was observed. XRD and textural properties also pointed in this direction, to the formation of a Ti–Ce solid solution.…”

Section: Resultsmentioning

confidence: 68%

Au-Decorated Ce–Ti Mixed Oxides for Efficient CO Preferential Photooxidation

Infantes‐Molina

Villanova

Talon

et al. 2020

ACS Appl. Mater. Interfaces

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We investigated the photocatalytic behavior of gold nanoparticles supported on CeO 2 –TiO 2 nanostructured matrixes in the CO preferential oxidation in H 2 -rich stream (photo-CO-PROX), by modifying the electronic band structure of ceria through addition of titania and making it more suitable for interacting with free electrons excited in gold nanoparticles through surface plasmon resonance. CeO 2 samples with different TiO 2 concentrations (0–20 wt %) were prepared through a slow coprecipitation method in alkaline conditions. The synthetic route is surfactant-free and environmentally friendly. Au nanoparticles (<1.0 wt % loading) were deposited on the surface of the CeO 2 –TiO 2 oxides by deposition–precipitation. A benchmarking sample was also considered, prepared by standard fast coprecipitation, to assess how a peculiar morphology can affect the photocatalytic behavior. The samples appeared organized in a hierarchical needle-like structure, with different morphologies depending on the Ti content and preparation method, with homogeneously distributed Au nanoparticles decorating the Ce–Ti mixed oxides. The morphology influences the preferential photooxidation of CO to CO 2 in excess of H 2 under simulated solar light irradiation at room temperature and atmospheric pressure. The Au/CeO 2 –TiO 2 systems exhibit much higher activity compared to a benchmark sample with a non-organized structure. The most efficient sample exhibited CO conversions of 52.9 and 80.2%, and CO 2 selectivities equal to 95.3 and 59.4%, in the dark and under simulated sunlight, respectively. A clear morphology–functionality correlation was found in our systematic analysis, with CO conversion maximized for a TiO 2 content equal to 15 wt %. The outcomes of this study are significant advancements toward the development of an effective strategy for exploitation of hydrogen as a viable clean fuel in stationary, automotive, and portable power generators.

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“…As the heating process promoted the oxidation of cerium, some part of Ce 3+ was transformed into Ce 4+ . These envelopes conrmed the coexistence of both Ce 3+ and Ce 4+ , 40 as well as O 1s spectrum (Fig. 4c); two bonds of Ce with O were formed, which were CeO 2 with a binding energy of 529.0 eV and CeOOH with a binding energy of 531.3 eV.…”

Section: Surface Morphologymentioning

confidence: 98%

Effect of graphene oxide on anticorrosion performance of polyelectrolyte multilayer for 2A12 aluminum alloy substrates

et al. 2017

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Evaluation of Rh/Ce x Ti 1−x O 2 catalysts for synthesis of oxygenates from syngas using XPS and TPR techniques

Cited by 46 publications

References 31 publications

Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

Comparison of Efficiencies and Mechanisms of Catalytic Ozonation of Recalcitrant Petroleum Refinery Wastewater by Ce, Mg, and Ce-Mg Oxides Loaded Al2O3

Au-Decorated Ce–Ti Mixed Oxides for Efficient CO Preferential Photooxidation

Effect of graphene oxide on anticorrosion performance of polyelectrolyte multilayer for 2A12 aluminum alloy substrates

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