Nanocrystalline Co3O4 catalysts for toluene and propane oxidation: Effect of the precipitation agent

Zhang, Weidong; Díez-Ramírez, J.; Anguita, Paola; Descorme, C.; Valverde, J.L.; Giroir‐Fendler, A.

doi:10.1016/j.apcatb.2020.118894

Cited by 96 publications

(58 citation statements)

References 62 publications

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“…It was observed that the activity could be kept at the high conversion stage, whereas there was an obvious loss of activity at the low conversion stage. Considering the hysteresis phenomenon between the heating and cooling processes, where the hydrocarbon was completely converted into CO2 in the heating run, as shown in Figure S3, the origin of the activity loss at the low conversion stage could be related to the formation of the carbonaceous species on the surface of the catalyst preventing the oxidation of toluene, which was also observed by other researchers [23,41].…”

Section: Stability Testsupporting

confidence: 62%

“…The Raman spectra allow us to get information about the lattice distortion of the catalysts ( Figure 3). Five bands at 191, 474, 514, 609, and 679 cm −1 were observed, corresponding to the stretching modes of the spinel Co3O4 [23]. The bands at 474 and 679 cm −1 were attributed to the Eg and A1g modes, respectively, whereas the bands at 191, 514, and 609 cm −1 could be assigned to the F2g modes.…”

Section: Characterization Of the Catalystsmentioning

confidence: 93%

“…In the temperature range of 200 to 300 • C, the curves showed an intense loss of mass (ca. 23 wt.%) together with an endothermic peak at around 255 • C due to the thermal decomposition of cobalt hydroxide carbonate in the catalyst precursors [23,32]. The endothermic peak in the DSC curves, as shown in Figure 1b, shifted to higher temperatures when increasing the number increasing the number of washing steps.…”

Section: Decomposition Of the Catalyst Precursorsmentioning

confidence: 93%

“…Spinel cobalt oxide, Co 3 O 4 , with Co 2+ surrounded by a tetrahedral O 2− coordination sphere and Co 3+ surrounded by octahedral O 2− environment, has been proven to be one of the most promising and efficient materials for several catalytic reactions due to the advantages of low-temperature reducibility, high bulk oxygen mobility, and facile formation of active surface oxygen species [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

et al. 2020

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A series of Co3O4 catalysts with different contents of residual sodium were prepared using a precipitation method with sodium carbonate as a precipitant and tested for the catalytic oxidation of 1000 ppm propane and toluene at a weight hourly space velocity of 40,000 mL g−1 h−1, respectively. Several techniques were used to characterize the physicochemical properties of the catalysts. Results showed that residual sodium could be partially inserted into the Co3O4 spinel lattice, inducing distortions and helping to increase the specific surface area of the Co3O4 catalysts. Meanwhile, it could negatively affect the reducibility and the oxygen mobility of the catalysts. Moreover, residual sodium had a significant influence on the catalytic activity of propane and toluene oxidation over the synthesized Co3O4 catalysts. The catalyst derived from the precursor washed three times presented the best activity for the catalytic oxidation of propane. The origin was traced to its better reducibility and higher oxygen mobility, which were responsible for the formation of active oxygen species. On the other hand, the catalyst obtained from the precursor washed two times exhibited better performance in toluene oxidation, benefitting from its more defective structure and larger specific surface area. Furthermore, the most active catalysts maintained constant performance in cycling and long-term stability tests of propane and toluene oxidation, being potentially applicable for practical applications.

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Section: Stability Testsupporting

confidence: 62%

Section: Characterization Of the Catalystsmentioning

confidence: 93%

Section: Decomposition Of the Catalyst Precursorsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

et al. 2020

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“…The total oxidation of toluene [31] by Co 3 O 4 was reported at temperatures ranging from 250 to 300 • C. On the other hand, toluene sensors with the best operating temperatures ranging around 200 • C (10 to 100 ppm concentrations, response from about 6 to 7) have been published [16]. Ammonia is a peculiar and instructive case.…”

Section: Co 3 Omentioning

confidence: 99%

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

et al. 2021

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The connection between heterogeneous catalysis and chemoresistive sensors is emerging more and more clearly, as concerns the well-known case of supported noble metals nanoparticles. On the other hand, it appears that a clear connection has not been set up yet for metal oxide catalysts. In particular, the catalytic properties of several different oxides hold the promise for specifically designed gas sensors in terms of selectivity towards given classes of analytes. In this review, several well-known metal oxide catalysts will be considered by first exposing solidly established catalytic properties that emerge from related literature perusal. On this basis, existing gas-sensing applications will be discussed and related, when possible, with the obtained catalysis results. Then, further potential sensing applications will be proposed based on the affinity of the catalytic pathways and possible sensing pathways. It will appear that dialogue with heterogeneous catalysis may help workers in chemoresistive sensors to design new systems and to gain remarkable insight into the existing sensing properties, in particular by applying the approaches and techniques typical of catalysis. However, several divergence points will appear between metal oxide catalysis and gas-sensing. Nevertheless, it will be pointed out how such divergences just push to a closer exchange between the two fields by using the catalysis knowledge as a toolbox for investigating the sensing mechanisms.

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Co₃O₄‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs

Xiao,

Zhao,

et al. 2024

ChemCatChem

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Volatile organic compounds (VOCs) are a significant source of environmental pollution, posing threats to human safety. With growing concerns about environmental degradation, catalytic oxidation technology emerges as a paramount and widely adopted approach for VOCs elimination, renowned for its operational simplicity, energy efficiency, and environmental friendliness. As a representative transition metal catalyst, cobalt‐based catalysts have garnered widespread use in VOCs catalytic oxidation due to their costeffectiveness, versatility, and distinctive physicochemical properties. This paper provides a detailed exposition of the construction strategies and structure‐activity relationship of Co3O4‐based catalysts in VOCs oxidation reaction, encompassing both monometallic Co3O4 and multimetallic cobalt‐based catalysts. Furthermore, it offers a comprehensive summary and discussion of the latest research progress concerning Co3O4‐based catalysts in practical applications. Concluding with a meticulous analysis, the paper addresses the technical challenges inherent in developing Co3O4‐based catalysts for VOCs degradation. Additionally, it proposes research directions aimed at overcoming these challenges, contributing to the ongoing discourse on environmental sustainability.

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Nanocrystalline Co3O4 catalysts for toluene and propane oxidation: Effect of the precipitation agent

Cited by 96 publications

References 62 publications

The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

Co₃O₄‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs

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Nanocrystalline Co3O4 catalysts for toluene and propane oxidation: Effect of the precipitation agent

Cited by 96 publications

References 62 publications

The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

How Chemoresistive Sensors Can Learn from Heterogeneous Catalysis. Hints, Issues, and Perspectives

Co3O4‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs

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Product

Resources

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Co₃O₄‐Based Catalysts for the Low‐Temperature Catalytic Oxidation of VOCs