Freeze-dried Co 3 O 4 –CeO 2 catalysts for the preferential oxidation of CO with the presence of CO 2 and H 2 O in the feed

Arango-Díaz, A.; Cecilia, Juan Antonio; Marrero-Jerez, J.; Núñez, Pedro; Jiménez-Jiménez, José; Rodríguez‐Castellón, Enrique

doi:10.1016/j.ceramint.2016.01.151

Cited by 34 publications

(16 citation statements)

References 57 publications

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“…The T 100% of standalone Co 3 O 4 (H) catalyst is well comparable/above (with) the activity of CuO-ceria catalysts, as reported elsewhere [14][15][16][17], and better off in terms of selectivity. An average of 98% CO conversion falls within the fuel cells operating temperature window [24]. The PROX activity of the Co 3 O 4 (H) catalyst is consistent with the suggestion made by Boyd et al [25], though on different systems (i.e., for the need of partially reduced gold state).…”

Section: Catalytic Performance Of Various Cobalt Species On Prox Of Cosupporting

confidence: 88%

“…The catalyst showed almost zero H 2 conversion and selectivity towards moisture ( Figure 8C,D). The Co 3 O 4 (H) catalyst outperformed the PROX activity of the Co 3 O 4 -CeO 2 catalyst reported by Arango-Diaz et al [24]. This reduces the needs of bimetallic oxides catalysts, which could result in lower catalyst costs.…”

Section: Catalytic Performance Of Various Cobalt Species On Prox Of Comentioning

confidence: 66%

“…Furthermore, the catalyst deactivates due to surface reconstruction, which hinders the redox cycle [23]. For the PROX catalysts to operate effectively, the catalyst has to start working at room temperature and achieve higher activity and selectivity at approximately 80-100 • C [24].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hydrazine Pretreatment on the Activity, Stability and Active Sites of Cobalt Species for Preferential Oxidation (PROX) of CO in H2-Rich Stream

2019

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The as-prepared (Co3O4) and hydrazine-treated (Co3O4(H)) cobalt catalysts were prepared using the precipitation method and evaluated at a temperature range of 40–220 °C for preferential oxidation (PROX) of CO in excess hydrogen. An improved surface reducibility with smaller crystallite size was noted on hydrazine-treated cobalt species (i.e., Co3O4(H) catalyst), which indicates some surface transformation. This finding correlates with the surface roughness formation (as depicted by scanning electron microscope (SEM) and transmission electron microscope (TEM) data), which was further confirmed by an increase in the Brunauer–Emmett–Teller (BET) surface area. The mesoporous structure of the Co3O4(H) catalyst remained intact, as compared to that of the Co3O4 catalyst. Interestingly, the in situ treatment of the standalone Co3O4(H) catalyst decreased the maximum CO conversion temperature (T100%) from 160 °C (over Co3O4) to 100 °C, with good selectivity. The Co3O4(H) catalyst showed good stability, with approximately 85% CO conversion at 100 °C for 21 h, as compared to a faster deactivation of the Co3O4 catalyst. However, the Co3O4(H) catalyst was unstable in both CO2 and the moisture environment. Based on the evaluation of spent hydrazine-treated (CoO(H)) cobalt catalyst, the high PROX activity is associated with the formation of Co3+ species as confirmed by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and temperature-programmed reduction (TPR) data.

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Section: Catalytic Performance Of Various Cobalt Species On Prox Of Cosupporting

confidence: 88%

Section: Catalytic Performance Of Various Cobalt Species On Prox Of Comentioning

confidence: 66%

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Effect of Hydrazine Pretreatment on the Activity, Stability and Active Sites of Cobalt Species for Preferential Oxidation (PROX) of CO in H2-Rich Stream

2019

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“…Two obvious characteristic reduction peaks could be seen in the H 2 ‐TPR curve of Ce/Ti. The peak at lower temperatures (<650 °C) was originated from the reduction of coordinately unsaturated surface capping oxygen species, which could be favored by the presence of smaller particle size . The peak at higher temperatures (> 700 °C) was due to the reduction of bulk oxygen in CeO 2.…”

Section: Resultsmentioning

confidence: 96%

“…The ΔH of vaporization of O 2 from lattice oxygen atom of cobalt oxides is relatively low, which makes the lattice oxygen ready to be released at lower temperatures, thus giving the high activity of cobalt oxides for catalytic oxidation . Previous researches show that the combination of Ce with Co oxides can lead to different physicochemical properties and catalytic behavior from the individual components . The nucleation/growth of CeO 2 crystal and the oxidation state of Ce element might be affected by the incorporation of Co into the catalyst system.…”

Section: Introductionmentioning

confidence: 99%

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Zhang

Cao

et al. 2020

Applied Organom Chemis

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The Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation was used for efficient elemental mercury oxidation in flue gas. Results indicated that Co doping greatly enhanced the activity and SO2 resistance of the CeO2‐TiO2 catalyst. In the presence of 5% O2, 500 ppm NO, 800 ppm SO2 and 3% H2O at 200 °C, the Hg0 removal efficiency of CeCo3/Ti could maintain at about 87% for a relatively long time. Characterizations of catalysts (BET, XRD, Raman spectroscopy, TEM, H2‐TPR, O2‐TPD, XPS, TG‐MS and SO2‐DRIFTS) were carried out to reveal the mechanism of Co modification on the redox ability, SO2 resistance and resultant mercury oxidation removal performance of catalyst. It was found that an interaction of Ce with Co promoted the dispersion of CeO2, increased chemisorbed oxygen concentration, and improved the oxygen storage capacity and the reducibility of catalyst, which was beneficial to the improvement of Hg0 oxidation removal. Hg0 would adsorb onto the catalyst and react with surface active oxygen species replenished by gas‐phase O2 to be oxidized via Mars‐Maessen mechanism. SO2 consumed the surface active oxygen species and resulted in the reduction of Ce4+ to Ce3+, which induced the deactivation of catalyst. The introduced Co in CeO2‐TiO2 catalyst exerted the function of protecting Ce4+ from being poisoned by SO2 and thus promoted the sulfur resistance and Hg0 removal performance of the catalyst in the presence of SO2.

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Hollow Multishelled Structure of Heterogeneous Co₃O₄–CeO₂₋_x Nanocomposite for CO Catalytic Oxidation

Wang

Mao

et al. 2019

Adv Funct Materials

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Herein, hollow multishelled structure (HoMS) of Co3O4–CeO2−x nanocomposites with controllable molar ratio of Co and Ce elements is synthesized by a general strategy sequential templating approach (STA) with a facile and efficient electrostatic spray process. As a catalyst of carbon monoxide (CO) catalytic oxidation, Co3O4–CeO2−x (Co/Ce = 4/1) HoMS achieves good catalytic activity (complete conversion temperature is 166.9 °C) and stability (100 h). This performance is attributed to synergistic effects between the two components. The combination of Co3O4 and CeO2 not only generates more interfaces of Co3O4–CeO2−x, which is more favorable for the activation of oxygen, but also improves the oxidizability of Co3O4 as well as the capacity of oxygen storage of CeO2. In addition, the relatively larger effective specific surface area of the HoMS can provide more active sites, while the unique structure of HoMS can facilitate gas diffusion and maintain structural stability.

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Freeze-dried Co 3 O 4 –CeO 2 catalysts for the preferential oxidation of CO with the presence of CO 2 and H 2 O in the feed

Cited by 34 publications

References 57 publications

Effect of Hydrazine Pretreatment on the Activity, Stability and Active Sites of Cobalt Species for Preferential Oxidation (PROX) of CO in H2-Rich Stream

Effect of Hydrazine Pretreatment on the Activity, Stability and Active Sites of Cobalt Species for Preferential Oxidation (PROX) of CO in H2-Rich Stream

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Hollow Multishelled Structure of Heterogeneous Co₃O₄–CeO₂₋_x Nanocomposite for CO Catalytic Oxidation

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Freeze-dried Co 3 O 4 –CeO 2 catalysts for the preferential oxidation of CO with the presence of CO 2 and H 2 O in the feed

Cited by 34 publications

References 57 publications

Effect of Hydrazine Pretreatment on the Activity, Stability and Active Sites of Cobalt Species for Preferential Oxidation (PROX) of CO in H2-Rich Stream

Effect of Hydrazine Pretreatment on the Activity, Stability and Active Sites of Cobalt Species for Preferential Oxidation (PROX) of CO in H2-Rich Stream

Enhanced activity and SO2 resistance of Co‐modified CeO2‐TiO2 catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Hollow Multishelled Structure of Heterogeneous Co3O4–CeO2−x Nanocomposite for CO Catalytic Oxidation

Contact Info

Product

Resources

About

Enhanced activity and SO₂ resistance of Co‐modified CeO₂‐TiO₂ catalyst prepared by facile co‐precipitation for elemental mercury removal in flue gas

Hollow Multishelled Structure of Heterogeneous Co₃O₄–CeO₂₋_x Nanocomposite for CO Catalytic Oxidation