MnO  modified Co3O4-CeO2 catalysts for the preferential oxidation of CO in H2-rich gases

Guo, Qiang; Liu, Yuan

doi:10.1016/j.apcatb.2008.01.007

Cited by 125 publications

(47 citation statements)

References 39 publications

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“…However, studies on Co 3 O 4 catalyst for the PROX of CO in H 2 -rich stream are scarce [12][13][14]. Yung et al [12] studied the PROX of CO over a CoO x /ZrO 2 catalyst under various reaction conditions and found that the CoO x / ZrO 2 catalyst showed high CO conversion and high selectivity of CO oxidation in a temperature window of 80-200°C .…”

Section: Introductionmentioning

confidence: 98%

“…Yung et al [12] studied the PROX of CO over a CoO x /ZrO 2 catalyst under various reaction conditions and found that the CoO x / ZrO 2 catalyst showed high CO conversion and high selectivity of CO oxidation in a temperature window of 80-200°C . Recently, Guo and Liu [13,14] reported that high CO conversion activity could be achieved over a Co 3 O 4 -CeO 2 catalyst. They also indicated that the addition of MnO x could promote the interaction between Co 3 O 4 and CeO 2 , and thus increase the Co 3?…”

Section: Introductionmentioning

confidence: 99%

“…They also indicated that the addition of MnO x could promote the interaction between Co 3 O 4 and CeO 2 , and thus increase the Co 3? content in the catalyst, which may enhance the selectivity for CO oxidation [14]. On the other hand, CuO is also known to be one of the main active components for the PROX of CO, and a few studies have been contributed to CuO-CeO 2 catalysts [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the selectivity for CO oxidation in H 2 -rich gas mixtures over noble metal catalysts may decrease at high reaction temperatures [5,9]. Therefore, it is highly desirable to develop efficient non-noble transition metal oxide catalysts for the PROX of CO [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Cobalt and Copper Composite Oxides as Efficient Catalysts for Preferential Oxidation of CO in H2-Rich Stream

Liu

Zhang

et al. 2008

Catal Lett

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A series of Co-Cu composite oxides with different Co/Cu atomic ratios were prepared by a co-precipitation method. XRD, N 2 sorption, TEM, XPS, H 2 -TPR, CO-TPR, CO-TPD and O 2 -TPD were used to characterize the structure and redox properties of the composite oxides. Only spinel structure of Co 3 O 4 phase was confirmed for the Co-Cu composite oxides with Co/Cu ratios of 4/1 and 2/1, but the particle sizes of these composite oxides decreased evidently compared with Co 3 O 4 . These composite oxides could be reduced at lower temperatures than Co 3 O 4 by either H 2 or CO. CO and O 2 adsorption amounts over the composite oxides were significantly higher than those over Co 3 O 4 . These results indicated a strong interaction between cobalt and copper species in the composite samples, possibly suggesting the formation of Cu x Co 3-x O 4 solid solution. For the preferential oxidation of CO in a H 2 -rich stream, the Co-Cu composite oxides (Co/Cu = 4/1-1/1) showed distinctly higher catalytic activities than both Co 3 O 4 and CuO, and the formation of Cu x Co 3-x O 4 solid solution was proposed to contribute to the high catalytic activity of the composite catalysts. The Co-Cu composite oxide was found to exhibit higher catalytic activity than several other Co 3 O 4 -based binary oxides including Co-Ce, Co-Ni, Co-Fe and Co-Zn oxides.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cobalt and Copper Composite Oxides as Efficient Catalysts for Preferential Oxidation of CO in H2-Rich Stream

Liu

Zhang

et al. 2008

Catal Lett

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“…Catalytic oxidation of CO is an efficient way to control emissions. Recently, some precious metal catalysts (Pd, Au, Pt, Ru) [1][2][3][4][5][6] and transition metal catalysts (Cu, Co, Mn) [7][8][9][10][11][12][13][14] have been developed for low-temperature CO oxidation. The precious metal catalysts can have high activity for CO oxidation.…”

Section: Introductionmentioning

confidence: 99%

CuO/Ce x Sn1−x O2 catalysts: synthesis, characterization, and catalytic performance for low-temperature CO oxidation

Cao

Wang

Sun

et al. 2010

Transition Met Chem

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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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MnO modified Co3O4-CeO2 catalysts for the preferential oxidation of CO in H2-rich gases

Cited by 125 publications

References 39 publications

Cobalt and Copper Composite Oxides as Efficient Catalysts for Preferential Oxidation of CO in H2-Rich Stream

Cobalt and Copper Composite Oxides as Efficient Catalysts for Preferential Oxidation of CO in H2-Rich Stream

CuO/Ce x Sn1−x O2 catalysts: synthesis, characterization, and catalytic performance for low-temperature CO oxidation

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

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