Efficient cobalt–manganese oxide catalyst deposited on modified AC with unprecedented catalytic performance in CO preferential oxidation

Zhao, Zhongkui; Bao, Ting; Zeng, Yang; Wang, Guiru; Muhammad, Turghun

doi:10.1016/j.catcom.2012.12.001

Cited by 21 publications

(16 citation statements)

References 36 publications

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“…Furthermore, in comparison of neat Co 3 O 4 , the shift of Co 3 O 4 diffraction peaks to lower angles can be observed on the Co‐Mn‐O‐ns and Co‐Mn‐O‐np, suggesting the expansion in Co 3 O 4 unit cell. The similar phenomena can be found in the previous reports, which might be ascribed to the formation of Mn x Co 3 − x O 4 composite oxide phase owing to Mn insertion. The formation of Mn x Co 3 − x O 4 solid solution had been confirmed by X‐ray absorption fine structure spectroscopy via analyzing the difference in coordination structures around Co and Mn atoms and the valence state of Mn species .…”

Section: Resultssupporting

confidence: 91%

“…The effluent gas was first cooled by a condenser with ice water as coolant to remove H 2 O before the gas flowing into chromatographic columns. No methane was detected over our catalysts in the temperature range from 30 to 220°C, which was consistent with the previous reports …”

Section: Methodssupporting

confidence: 94%

“…This suggests more Co 3 O 4 species, catalytically active for CO PROX reaction, on the Co‐Mn‐O‐ns catalyst as compared to Co‐Mn‐O‐np, which is consistent with the results from XPS analysis shown as above. The broadened feature peaks corresponding to Co 3 O 4 with a visible shift to lower wavenumber on Raman spectrum of Co‐Mn‐O‐ns catalyst, in comparison of that of pure Co 3 O 4 , can be readily observed, suggesting the existence of strong interaction of Co‐Mn . This may lead to the increase in the catalytic performance of Co‐based catalysts.…”

Section: Resultsmentioning

confidence: 94%

“…That is to say, the morphology of Co‐Mn composite oxide affects the surface Co/Mn ratio, and the nanosheet structured Co‐Mn‐O‐ns sample is favorable for Co‐enrichment on its surface. Both higher surface Co/Mn atomic ratio and higher Co 3+ /Co 2+ of the Co‐Mn‐O‐ns demonstrates the more Co 3+ absolute amount on its surface, which results in its higher catalytic activity than Co‐Mn‐O‐np, now that Co 3+ is the main active species for CO PROX reaction . Moreover, as a first approximation Co enrichment could lead to higher electronegative sites (1.8) when compared to Mn (1.5), which may affect kinetics, and hence higher activity for Co‐Mn‐O‐ns sheets.…”

Section: Resultsmentioning

confidence: 99%

“…As the other candidate for CO PROX, the cobalt‐based catalysts have illustrated a wider temperature window for complete CO removal, but their catalytic activity at low temperature is definitely required to be improved . In Dr. Zhongkui Zhao's “Nano Catalysis and Energy Storage” research group at Dalian University of Technology, recently, the continuing efforts are being made to improve catalytic performance especially catalytic activity at low temperature of cobalt‐based catalysts, and the Co‐Mn‐based catalysts have been considered to be a promising candidate, but the catalytic activity at low temperature is not satisfactory . Therefore, further improvement in catalytic activity at low temperature is essential for practical applications in PEMFC.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 91%

Section: Methodssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

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High‐Performance Co‐MnO_x Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O₃ Decomposition

et al. 2019

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A highly active and efficient thin-felt Al-fiber-structured Co-MnO x composite oxide catalyst (named Co-MnO x -Al) with unique form factor and high permeability is developed for highthroughput catalytic decomposition of gaseous ozone (O 3 ). Thin-sheet Al-fiber felt (60 μm diameter; 90 vol % voidage) chips underwent a steam-only oxidation and calcination for endogenously growing a 0.7-μm-thick mesoporous layer of γ-Al 2 O 3 nanosheets along with the Al-fiber. Cobalt and manganese were placed onto the ns-γ-Al 2 O 3 /Al-fiber chips by incipient wetness co-impregnation method. The best catalyst is the one with a Co/Mn molar ratio of 0.36 and Co-Mn loading of 5 wt % after calcining at 500°C (named Co-MnO x (0.36)-Al), being able to achieve full O 3 conversion at 25°C for a feed gas containing 1000 � 30 ppm O 3 , using a high gas hourly space velocity of 48000 mL g cat.À 1 h À 1 ; full O 3 conversion is retained in the absence of moisture till the testing end after 720 min; in case with a relative humidity of 50 %, O 3 conversion slides from 88 % of the initial value to a flat of~66 % within 90 min. CoO x modification is paramount for improved formation of Mn 2 + species while leading to the highest fraction of (Mn 2 + + Mn 3 + ) in total (Mn 2 + + Mn 3 + + Mn 4 + ) and more oxygen vacancies on Co-MnO x (0.36)-Al catalyst surface.[a] L.

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Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H₂ Rich Environment

et al. 2020

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Efficient cobalt–manganese oxide catalyst deposited on modified AC with unprecedented catalytic performance in CO preferential oxidation

Cited by 21 publications

References 36 publications

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

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

High‐Performance Co‐MnO_x Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O₃ Decomposition

Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H₂ Rich Environment

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Efficient cobalt–manganese oxide catalyst deposited on modified AC with unprecedented catalytic performance in CO preferential oxidation

Cited by 21 publications

References 36 publications

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

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

High‐Performance Co‐MnOx Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O3 Decomposition

Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H2 Rich Environment

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Product

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High‐Performance Co‐MnO_x Composite Oxide Catalyst Structured onto Al‐Fiber Felt for High‐Throughput O₃ Decomposition

Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H₂ Rich Environment