Morphology-dependent performance of Co 3 O 4 via facile and controllable synthesis for methane combustion

Chen, Zhiping; Wang, Sheng; Liu, Weigang; Gao, Xiang; Gao, Diannan; Wang, Mingzhe; Wang, Shudong

doi:10.1016/j.apcata.2016.07.009

Cited by 133 publications

(54 citation statements)

References 52 publications

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“…The amount of CO 2 evolved from the complete oxidation reaction was barely perceptible over the Co/Al sample. Above 525-550 • C the methane partial oxidation occurred, where methane reacted with low-mobility oxygen species associated with Co 2+ ions, yielding significant amounts of CO and H 2 along with CO 2 [14]. It must be noted that the occurrence of this second process was not observed over the Co/Al catalyst, thus suggesting that it could only take place at temperatures higher than 600 • C.…”

Section: Physico-chemical Characterizationmentioning

confidence: 96%

“…More specifically, bulk spinel-type cobalt oxide (Co 3 O 4 ) is regarded as a highly interesting substitute to noble metals for catalytic oxidation of trace amounts of methane on the basis of its excellent redox properties [9][10][11][12]. However, when prepared by conventional synthesis methodologies [13,14], the textural and structural properties of this oxide tend to be poor. Although some routes can partially overcome this problem, they are normally too complex and difficult to scale up to the industrial operation [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion

et al. 2020

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Spinel-type cobalt oxide is a highly active catalyst for oxidation reactions owing to its remarkable redox properties, although it generally exhibits poor mechanical, textural and structural properties. Supporting this material on a porous alumina can significantly improve these characteristics. However, the strong cobalt–alumina interaction leads to the formation of inactive cobalt aluminate, which limits the activity of the resulting catalysts. In this work, three different strategies for enhancing the performance of alumina-supported catalysts are examined: (i) surface protection of the alumina with magnesia prior to the deposition of the cobalt precursor, with the objective of minimizing the cobalt–alumina interaction; (ii) coprecipitation of cobalt along with nickel, with the aim of improving the redox properties of the deposited cobalt and (iii) surface protection of alumina with ceria, to provide both a barrier effect, minimizing the cobalt–alumina interaction, and a redox promoting effect on the deposited cobalt. Among the examined strategies, the addition of ceria (20 wt % Ce) prior to the deposition of cobalt resulted in being highly efficient. This sample was characterized by a notable abundance of both Co3+ and oxygen lattice species, derived from the partial inhibition of cobalt aluminate formation and the insertion of Ce4+ cations into the spinel lattice.

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Section: Physico-chemical Characterizationmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion

et al. 2020

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“…All samples generated a typical IV isotherm and a type H3 hysteresis loop, indicating that mesoporous structures were formed by the free accumulation of superfine particle in all catalysts. 20 But different potassium salts had an obvious effect on the pore structure of the Co 3 O 4 catalyst. The parent Co 3 O 4 sample had the most apparent hysteresis loop, the biggest surface area (95.4 m 2 g −1 ), pore volume (0.39 cm 3 g −1 ) and radius (16.5 nm).…”

Section: Sem and Betmentioning

confidence: 99%

Promotion effect of potassium carbonate on catalytic activity of Co₃O₄ for formaldehyde removal

Fan

Shi

Zhang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: The effect of K 2 CO 3 on modified Co 3 O 4 was evaluated for the catalytic removal of formaldehyde (HCHO). The synthesized catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area, H 2 temperature-programmed reduction (H 2 -TPR), CO 2 temperature-programmed desorption (CO 2 -TPD) and in situ diffuse reflectance infrared spectroscopy (DRIFTS) analyses. RESULTS: The results indicated that the Co 3 O 4 sample modified by 3 wt% K 2 CO 3 was able to provide 100% conversion of HCHOto CO 2 at 100 ∘ C, while KNO 3 and KCl could barely promote the catalytic performance of Co 3 O 4 . K 2 CO 3 increased the valence state of Co and the number of oxygen vacancies on the surface of modified Co 3 O 4 , thereby enhancing the oxidation ability. The product water on the Co 3 O 4 surface could convert the carbonate to bicarbonate via hydrolysis of K 2 CO 3 , which promoted hydroxyl regeneration and accelerated intermediate species oxidation. CONCLUSION: Thus, the Co 3 O 4 modified by an appropriate amount of K 2 CO 3 exhibited an excellent performance for formaldehyde oxidation removal. Catalytic activity of different anionic potassium salt loaded on Co 3 O 4Different potassium precursors were compared for the catalytic activity of K-promoted cobalt spinel for HCHO decomposition. The formaldehyde removal rate over the different anionic potassium salts that were loaded to the same potassium molar ratio of K 2 CO 3 /Co 3 O 4 (3 wt%) is shown in Fig. 2.The catalytic activity of KNO 3 /Co 3 O 4 and KCl/Co 3 O 4 was almost the same as the Co 3 O 4 catalyst. The temperature for 10% conversion rate of HCHO was 90 ∘ C and for complete conversion was 120 ∘ C for the three catalysts. Nevertheless, for K 2 CO 3 /Co 3 O 4 , the formaldehyde removal rate increased obviously at low

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“…4,5 However, it is difficult for methane to be oxidized due to the strongest C-H bond among hydrocarbons. 6 The main ways to perform complete oxidation of methane are ame combustion and catalytic combustion. But higher reaction temperature, emission of unburned hydrocarbons and more polluting environmental pollutants (NO x ), as well as lower energy efficiency represent serious disadvantages of ame combustion.…”

Section: Introductionmentioning

confidence: 99%

Combustion of lean methane over Co₃O₄ catalysts prepared with different cobalt precursors

Zheng

Zhou

et al. 2020

RSC Adv.

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Morphology-dependent performance of Co 3 O 4 via facile and controllable synthesis for methane combustion

Cited by 133 publications

References 52 publications

Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion

Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion

Promotion effect of potassium carbonate on catalytic activity of Co₃O₄ for formaldehyde removal

Combustion of lean methane over Co₃O₄ catalysts prepared with different cobalt precursors

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Morphology-dependent performance of Co 3 O 4 via facile and controllable synthesis for methane combustion

Cited by 133 publications

References 52 publications

Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion

Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion

Promotion effect of potassium carbonate on catalytic activity of Co3O4 for formaldehyde removal

Combustion of lean methane over Co3O4 catalysts prepared with different cobalt precursors

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Product

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Promotion effect of potassium carbonate on catalytic activity of Co₃O₄ for formaldehyde removal

Combustion of lean methane over Co₃O₄ catalysts prepared with different cobalt precursors