Low-temperature water–gas shift: Strategy to lower Pt loading by doping ceria with Ca2+ improves formate mobility/WGS rate by increasing surface O-mobility

Linganiso, Linda Z.; Jacobs, Gary; Azzam, Khalid G.; Graham, Uschi M.; Davis, Burtron H.; Cronauer, Donald C.; Kropf, A. Jeremy; Marshall, Christopher L.

doi:10.1016/j.apcata.2010.12.043

Cited by 47 publications

(47 citation statements)

References 56 publications

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“…5 Transient formate decomposition at 130°C over 0.5% Pt/ceria catalysts doped with a Ba b Y c Hf d La e undoped and f Zn CO conversion was found to be 18%, which is lower than the undoped Pt/ceria catalyst. These results are in good agreement with the results of other studies [23][24][25][26][33][34][35][36][37], that the oxide support has a strong influence on the WGS activity. The implication is that Ba, Y, Hf, and La strains the lattice, improving the O-mobility.…”

Section: Catalytic Testing Using a Fixed Bed Reactorsupporting

confidence: 95%

“…at 300°C. A similar decrease in the temperature of the surface reduction step was also observed in the case of zirconia [35] and calcium [37] doped ceria catalysts promoted with Pt and this …”

Section: X-ray Absorption Near Edge Spectroscopy (Xanes)supporting

confidence: 75%

“…In our previous studies [23,37], TPR-XANES investigations of a series of Pt/ceria catalysts having different Pt loadings and Ca doped Pt/ceria catalysts definitively identified that once Pt oxide reduction occurs, reduction of the ceria surface shell follows. The latter step was found to involve conversion of surface O to Type II bridging OH groups [17], with a corresponding change in oxidation state of the associated Ce atoms in the surface shell from Ce 4?…”

Section: X-ray Absorption Near Edge Spectroscopy (Xanes)mentioning

confidence: 97%

“…between 300 and 350°C as shown in Figure 3. In our previous investigation, [37] TPR-XANES of an undoped pure ceria identified that surface shell reduction was complete (*25% of Ce as Ce 3? ) between 450 and 500°C.…”

Section: X-ray Absorption Near Edge Spectroscopy (Xanes)mentioning

confidence: 97%

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Low-Temperature Water–Gas Shift: Doping Ceria Improves Reducibility and Mobility of O-Bound Species and Catalyst Activity

et al. 2011

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A series of platinum loaded catalysts supported on cation (Me)-doped cerium dioxide (Me = Ba, La, Y, Hf and Zn) was prepared by co-precipitation of the Me-nitrates and impregnation of a Pt precursor. Low temperature water-gas shift activity depends on the nature of dopant employed, varying in the order of Ba [ Y [ Hf [ La [ undoped ceria [ Zn. TPR-XANES measurements with flowing hydrogen reveal that adding dopants to ceria facilitate ceria reduction and increases the extents of both surface shell and bulk reduction of ceria. Experimental results confirm past theoretical models that dopants enhance both O-mobility and reducibility of ceria. DRIFTS measurements of the transient decomposition of formates in steam suggest that formate half-life follows the trend Znindicating that the formate decomposition rate is enhanced by the addition of most of the dopants tested. Taken together, the results suggest that dopant addition improves the WGS rate by increasing the O-mobility of O-bound associated intermediates. Therefore, less Pt and Ce, which are expensive, is required to achieve comparable levels of activity.

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Section: Catalytic Testing Using a Fixed Bed Reactorsupporting

confidence: 95%

Section: X-ray Absorption Near Edge Spectroscopy (Xanes)supporting

confidence: 75%

Section: X-ray Absorption Near Edge Spectroscopy (Xanes)mentioning

confidence: 97%

Section: X-ray Absorption Near Edge Spectroscopy (Xanes)mentioning

confidence: 97%

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Low-Temperature Water–Gas Shift: Doping Ceria Improves Reducibility and Mobility of O-Bound Species and Catalyst Activity

et al. 2011

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“…[101] Doping nanoceria with transition metals such as Fe, Mn, and Co, or oxides such as yttria and gadolinia, can enhance the oxygen diffusion, thus facilitating surface reactions. [102][103][104] Gupta et al [105] prepared nanoceria with different Ce 3＋ /Ce 4＋ ratio to fine-tune the catalytic activity by selection of different trivalent dopants. With this method, the surface Ce 3＋ concentration of nanoceria was appropriately tuned and superior SOD mimetic activity was produced as expected.…”

Section: Dopingmentioning

confidence: 99%

Ceria Nanoparticles as Enzyme Mimetics

Wang

Zhang

et al. 2017

Chin. J. Chem.

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In the past decades, enzyme mimetics based on ceria nanoparticles (nanoceria) have been developed as potential substitutes for nature enzymes. The mixed valence states of cerium and the patterns of oxygen vacancies on crystal planes result in different enzyme mimetic activities. In this review we survey the bio-applications of nanoceria-based enzyme mimetics as well as the underlying mechanisms. Factors influencing the enzyme mimetic activities and future perspective of nanoceria-based enzyme mimetics are also addressed.

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Nanocatalysis for Fuel Production

Jacobs

Davis

2013

Nanotechnology for the Energy Challenge

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Low-temperature water–gas shift: Strategy to lower Pt loading by doping ceria with Ca2+ improves formate mobility/WGS rate by increasing surface O-mobility

Cited by 47 publications

References 56 publications

Low-Temperature Water–Gas Shift: Doping Ceria Improves Reducibility and Mobility of O-Bound Species and Catalyst Activity

Low-Temperature Water–Gas Shift: Doping Ceria Improves Reducibility and Mobility of O-Bound Species and Catalyst Activity

Ceria Nanoparticles as Enzyme Mimetics

Nanocatalysis for Fuel Production

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