Preferential oxidation of CO (PROX) over CoOx/CeO2 in hydrogen-rich streams: Effect of cobalt loading

Gawade, Preshit; Bayram, Burcu; Alexander, Anne‐Marie; Ozkan, Umit S.

doi:10.1016/j.apcatb.2012.06.032

Cited by 73 publications

(43 citation statements)

References 69 publications

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“…The decrease in CO conversion could be attributed be the reverse water gas shift reaction (RWGS) [16], in addition to competitive adsorption, formation of carbonate species and the blockage of sites by the CO-H 2 O complex. The RWGS reaction promotes the formation of CO through the reduction of CO 2 by hydrogen at high temperatures.…”

Section: Addition Of Co 2 and H 2 Omentioning

confidence: 99%

“…This was accompanied by a decrease in hydrogen and oxygen conversions. Deactivation in this case is probably due to H 2 O blocking the active sites of the catalysts and forming the unreactive CO-H 2 O complex [15,16,21,22].…”

Section: Addition Of Co 2 and H 2 Omentioning

confidence: 99%

“…There are different views that are put forward to explain the decrease in conversion over time for CO PROX. These include a single or combination of factors, such as blocking of active sites by water [10,36], the formation of an inactive CO-H 2 O complex [16,37], accumulation of carbonates on the active sites of the catalyst [10,38], the reduction of the Co 3+ in the Co 3 O 4 phase [12,16] or the competitive adsorption between CO and CO 2 on the active sites of the catalyst [21,38]. To understand the reason for a decrease in the conversion at 120 • C over time, an experiment was carried out where 10 vol.% CO 2 was co-fed with CO. Fig.…”

Section: Time On Stream Experimentsmentioning

confidence: 99%

“…They have been used as single oxides or supported on other oxides such as CeO 2 lysts [10] and, to date, are still widely studied for CO oxidation in the absence of H 2 [22][23][24][25]. Recently, cobalt oxides supported on ceria and zicornia were shown to be promising catalysts for CO-PROX [12,16,20]. Gawade et al [16] showed that the increase in cobalt loading favoured CO conversion in CO-PROX.…”

Section: Introductionmentioning

confidence: 97%

“…Recently, cobalt oxides supported on ceria and zicornia were shown to be promising catalysts for CO-PROX [12,16,20]. Gawade et al [16] showed that the increase in cobalt loading favoured CO conversion in CO-PROX. It was noted that this behavior was only applicable at temperatures below 150 • C. Time on stream experiments in this study showed that the catalysts exhibited good stability, suggesting that no reduction occurred even in the presence of H 2 which was a concern in previous studies conducted, where reduction of cobalt to lower oxidation states (including metallic cobalt) promoted undesirable side reactions in CO-PROX [9,12].…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

Qwabe

Friedrich

Singh

2015

Journal of Molecular Catalysis A: Chemical

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Section: Addition Of Co 2 and H 2 Omentioning

confidence: 99%

Section: Addition Of Co 2 and H 2 Omentioning

confidence: 99%

Section: Time On Stream Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

Qwabe

Friedrich

Singh

2015

Journal of Molecular Catalysis A: Chemical

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A Controllable Surface Etching Strategy for Well‐Defined Spiny Yolk@Shell CuO@CeO₂ Cubes and Their Catalytic Performance Boost

Feng

Zhang

et al. 2018

Adv Funct Materials

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Herein, an effective top‐down etching route is presented to in situ fabricate CuO/CeO2 nanohybrids on the surface of Cu2O microcube templates. This method has well taken into account the factors both in thermodynamics and in kinetics, including surface structural nanocrystallization, construction of mesopores, formation of stable core@shell structures, and strengthened synergistic effects, in order to realize the structural design and hence greatly improve catalytic performance caused by surface nanocrystallization of Cu2O cubes. After etched by aid of ammonia and Ce3+ ions the final products are in a well‐defined spiny yolk@shell structures, in which the unetched part of Cu2O cubes serves as the core and the shell is composed by the CuO nanothorns encapsulated by CeO2 nanoparticles. Systematical characterizations including scanning electron microscopy, transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, H2‐temperature programmed reduction, N2 sorption, firmly disclose the relationship between the catalytic properties and the structures of samples. By simply tuning the usage amount of ammonia and Ce3+ ions, the samples show a typical volcano curve in the model reaction of catalytic CO oxidation. Sample CuO@CeO2‐0.05 exhibits the optimal catalytic activity and stability. It is believed that this top‐down strategy has shown promising future to design high‐performance catalysts for the practical need of application.

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Novel Co‐Mn‐O nanosheet catalyst for CO preferential oxidation toward hydrogen purification

et al. 2014

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Co-Mn-O composite oxide nanosheet catalyst was successfully prepared using a facile urea-assisted one-step hydrothermal method in the absence of organic or organic templating reagent. Co-Mn-O nanosheet catalyst was optimized by varying hydrothermal process parameters such as molar ratio of Co-Mn to urea, hydrothermal temperature, and hydrothermal time. Various characterization techniques including scanning electron microscopy, X-ray diffraction, nitrogen adsorption, X-ray photoelectron spectroscopy, Raman spectroscopy, and H 2 temperature-programmed reduction were used to reveal the relationship between catalyst nature and catalytic performance in CO preferential oxidation (CO PROX) in excess H 2 . The developed Co-Mn-O nanosheet catalyst have demonstrated much superior catalytic performance to Co-Mn-O nanoparticle, particularly in the low temperature range, and 100% CO conversion over the developed Co-Mn-O nanosheet can be achieved in temperature range of 50 to 150 C at 10,000 mL g 21 h 21 of gas hourly space velocity in the standard feed. Furthermore, the almost complete CO removal over Co-Mn-O nanosheet at 125 C of low temperature with 94.9% selectivity can be achieved even in the simulated reformed gas. The excellent catalytic performance is ascribed to nanosheet morphology, more surface Co 31 , smaller average crystallite size, higher reducibility, and strong Co-Mn interaction. Catalytic stability investigation indicates the developed nanostructured catalyst exhibits high catalytic stability for CO PROX reaction in simulated gas. The developed Co-Mn-O nanosheet catalyst can be a potential candidate for catalytic elimination of trace CO from H 2 -rich gas for Proton exchange membrane fuel cell applications. Reaction conditions: 100 mg catalyst, GHSV 5 15,000 mL h 21 g 21 , 1.0 vol % CO, 1.0 vol % O 2 , 50 vol % H 2 , Ar balance. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.] 242 Figure 8. The CO conversion (a) and O 2 selectivity to CO 2 (b) over the Co-Mn-O-ns samples prepared with diverse n Co-Mn/Urea . Reaction conditions: GHSV 5 15,000 mL h 21 g 21 , 1.0 vol % CO, 1.0 vol % O 2 , 50 vol % H 2 , Ar balance. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]

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Preferential oxidation of CO (PROX) over CoOx/CeO2 in hydrogen-rich streams: Effect of cobalt loading

Cited by 73 publications

References 69 publications

Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

A Controllable Surface Etching Strategy for Well‐Defined Spiny Yolk@Shell CuO@CeO₂ Cubes and Their Catalytic Performance Boost

Novel Co‐Mn‐O nanosheet catalyst for CO preferential oxidation toward hydrogen purification

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Preferential oxidation of CO (PROX) over CoOx/CeO2 in hydrogen-rich streams: Effect of cobalt loading

Cited by 73 publications

References 69 publications

Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

Preferential oxidation of CO in a hydrogen rich feed stream using Co–Fe mixed metal oxide catalysts prepared from hydrotalcite precursors

A Controllable Surface Etching Strategy for Well‐Defined Spiny Yolk@Shell CuO@CeO2 Cubes and Their Catalytic Performance Boost

Novel Co‐Mn‐O nanosheet catalyst for CO preferential oxidation toward hydrogen purification

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Resources

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A Controllable Surface Etching Strategy for Well‐Defined Spiny Yolk@Shell CuO@CeO₂ Cubes and Their Catalytic Performance Boost