Ethanol steam reforming over Co/CeO2 catalysts: Investigation of the effect of ceria morphology

Soykal, I. Ilgaz; Bayram, Burcu; Sohn, Hyuntae; Gawade, Preshit; Miller, Jeffrey T.; Ozkan, Umit S.

doi:10.1016/j.apcata.2012.09.038

Cited by 90 publications

(58 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…dispersed on the ceria surface as reported in [38,39], but their presence was confirmed by the TEM and Raman results (see below). The XRD results were supported by the Raman spectroscopy characterization.…”

Section: Elemental and Structural Characterizationsupporting

confidence: 50%

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Grzybek

Stelmachowski

Gudyka

et al. 2016

Applied Catalysis B: Environmental

107

View full text Add to dashboard Cite

dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: the role of the interface periphery, Applied Catalysis B, Environmental http://dx.doi.org/10. 1016/j.apcatb.2015.07.027 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. The catalytic tests in deN 2 O reaction revealed that the 10 wt.% of cobalt spinel in supported system is able to reproduce the activity of bare Co 3 O 4 catalyst. However, it was found that the catalyst with the lowest content of Co 3 O 4 equal to 1 wt.% exhibits the highest apparent reaction rate per mass of the spinel active phase. The observed activity was explained basing on the transmission electron microscopy analysis in terms of the dispersion of spinel phase over ceria support. A simple model that accounts for the observed strong dispersion effect is proposed. It consists in a two-step mechanism, where N 2 O is dissociated on the spinel nanograins and the resultant oxygen species are preferentially recombined at the Co 3 O 4 /CeO 2 interface periphery.

show abstract

Section: Elemental and Structural Characterizationsupporting

confidence: 50%

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Grzybek

Stelmachowski

Gudyka

et al. 2016

Applied Catalysis B: Environmental

107

View full text Add to dashboard Cite

show abstract

“…These materials were examined both as supports, as well as catalysts, in ethanol steam reforming to understand the effect of particle size and morphology [3,46]. In this article, we report the effect of microgravity on the synthesis of ceria.…”

Section: +mentioning

confidence: 99%

“…D-spacing was measured using Image J software. Figure 5c shows a ceria rod including (220) and (200) planes with 0.19 and 0.27 nm d-spacing [34,46,52]. Figure 5f indicates ceria nanopolyhedra and spheres with (311) and (220) planes [54].…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

“…To the best of our knowledge, there have not been any publications for the synthesis of nanorods under such conditions. In most cases, studies have concluded that ceria nanorods are formed at much higher temperatures and pressures [27,[46][47][48][49]. In order to understand the formation of ceria nanorods under microgravitiy condition, two crystal growth processes, Oswald ripening and oriented attachment, can be considered.…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

See 1 more Smart Citation

Effect of Microgravity on Synthesis of Nano Ceria

et al. 2015

Self Cite

View full text Add to dashboard Cite

Cerium oxide (CeO2) was prepared using a controlled-precipitation method under microgravity at the International Space Station (ISS). For comparison, ceria was also synthesized under normal-gravity conditions (referred as control). The Brunauer-Emmett-Teller (BET) surface area, pore volume and pore size analysis results indicated that the ceria particles grown in space had lower surface area and pore volume compared to the control samples. Furthermore, the space samples had a broader pore size distribution ranging from 30-600 Å, whereas the control samples consisted of pore sizes from 30-50 Å range. Structural information of the ceria particles were obtained using TEM and XRD. Based on the TEM images, it was confirmed that the space samples were predominantly nano-rods, on the other hand, only nano-polyhedra particles were seen in the control ceria samples. The average particle size was larger for ceria samples synthesized in space. XRD results showed higher crystallinity as well as larger mean crystal size for the space samples. The effect of sodium hydroxide concentration on synthesis of ceria was also examined using 1 M and 3 M solutions. It was found that the control samples, prepared in 1 M and 3 M sodium hydroxide solutions, did not show a significant difference between the two. However, when the ceria samples were prepared OPEN ACCESSCatalysts 2015, 5 1307 in a more basic medium (3 M) under microgravity, a decrease in the particle size of the nano-rods and appearances of nano-polyhedra and spheres were observed.

show abstract

“…Cerium oxide (CeO 2 ), due to its unique features (e.g., high oxygen storage capacity (OSC), rich oxygen vacancies, strong interaction with active metals, and ease of change between Ce 3+ and Ce 4+ ), has been regarded and extensively used as a versatile and excellent support for transition metal [4,5] and noble metal [6,7] catalysts in many catalytic processes [8]. Among these CeO 2 support catalysts, Figure 1 shows the XRD patterns of the CeO 2 supports and the corresponding Cu/CeO 2 catalysts.…”

Section: Introductionmentioning

confidence: 99%

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Ren

Peng

et al. 2017

Catalysts

View full text Add to dashboard Cite

CeO 2 nanooctahedrons, nanorods, and nanocubes were prepared by the hydrothermal method and were then used as supports of Cu-based catalysts for the water-gas shift (WGS) reaction. The chemical and physical properties of these catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 adsorption/desorption, UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2 -TPR) and in situ diffuse reflectance infra-red fourier transform spectroscopy (DRIFTS) techniques. Characterization results indicate that the morphology of the CeO 2 supports, originating from the selective exposure of different crystal planes, has a distinct impact on the dispersion of Cu and the catalytic properties. The nanooctahedron CeO 2 catalyst (Cu-CeO 2 -O) showed the best dispersion of Cu, the largest amount of moderate copper oxide, and the strongest Cu-support interaction. Consequently, the Cu-CeO 2 -O catalyst exhibited the highest CO conversion at the temperature range of 150-250 • C when compared with the nanocube and nanorod Cu-CeO 2 catalysts. The optimized Cu content of the Cu-CeO 2 -O catalysts is 10 wt % and the CO conversion reaches 91.3% at 300 • C. A distinctive profile assigned to the evolution of different types of carbonate species was observed in the 1000-1800 cm −1 region of the in situ DRIFTS spectra and a particular type of carbonate species was identified as a potential key reaction intermediate at low temperature.

show abstract

Ethanol steam reforming over Co/CeO2 catalysts: Investigation of the effect of ceria morphology

Cited by 90 publications

References 69 publications

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Strong dispersion effect of cobalt spinel active phase spread over ceria for catalytic N2O decomposition: The role of the interface periphery

Effect of Microgravity on Synthesis of Nano Ceria

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Contact Info

Product

Resources

About