Influence of CO addition on the toluene total oxidation over Co based mixed oxide catalysts

Genty, Éric; Brunet, Julien; Poupin, Christophe; Ojala, Satu; Siffert, Stéphane; Cousin, Renaud

doi:10.1016/j.apcatb.2019.01.081

Cited by 60 publications

(22 citation statements)

References 43 publications

(62 reference statements)

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“…[ 48,49 ] It has been reported that O α concentration (O α /(O α + O β ) is directly related to the catalytic performance. [ 50,51 ] The catalyst with higher O α proportion is expected to have better oxygen storage capacity and mobility. [ 52 ] The calculated results in Table 2 show that the proportion of O α on CuOA surface is the lowest, which is ≈22.3% and those of CuOU and CuOH are almost the same (≈24%).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of CuO/TiO₂/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Tang

Wang

Liu

et al. 2021

Adv Materials Inter

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This work reports a novel strategy to in situ grow TiO2 nanosheets on flexible Ti mesh as ideal support, and to modify CuO active components through multi‐step methods. The CuO/TiO2/Ti monolithic catalyst can realize the complete CO oxidation at 110 °C without the assistance of any noble metal and the outstanding long‐term stability can be also achieved. When using urea as deposition precipitant, CuO particle size will increase obviously with the reaction time longer than 6 h, which is adverse to the catalytic performance, showing the significant impact of CuO particle size on the CO oxidation capability. The deposition reaction carried out in different solutions is also investigated and the results show that CuO/TiO2/Ti catalysts synthesized in acid and alkaline condition exhibit superior catalytic performance owing to the high content of Cu1+/0 and adsorbed oxygen species (Oα) on surface, large surface area, and excellent redox capacity compared with that in reductive solution. More importantly, the as‐synthesized CuO/TiO2/Ti monolithic catalysts show outstanding low‐temperature performance and excellent long‐term stability, indicating the overwhelming advantage of in situ grown catalysts. It is expected that the peculiar in situ growth technology is capable of extending to monolithic catalysts for multiple applications in the future.

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Section: Resultsmentioning

confidence: 99%

Fabrication of CuO/TiO₂/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Tang

Wang

Liu

et al. 2021

Adv Materials Inter

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“…Co 2+ [28,29]. The promoted catalytic performance of Cu 0.05 Co and Ni 0.05 Co for toluene oxidation could be attributed to the strong synergistic effect between cobalt and doped metal cations.…”

Section: Discussionmentioning

confidence: 95%

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

et al. 2020

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Metal-doped (Mn, Cu, Ni, and Fe) cobalt oxides were prepared by a coprecipitation method and were used as catalysts for the total oxidation of toluene and propane. The metal-doped catalysts displayed the same cubic spinel Co3O4 structure as the pure cobalt oxide did; the variation of cell parameter demonstrated the incorporation of dopants into the cobalt oxide lattice. FTIR spectra revealed the segregation of manganese oxide and iron oxide. The addition of dopant greatly influenced the crystallite size, strain, specific surface area, reducibility, and subsequently the catalytic performance of cobalt oxides. The catalytic activity of new materials was closely related to the nature of the dopant and the type of hydrocarbons. The doping of Mn, Ni, and Cu favored the combustion of toluene, with the Mn-doped one being the most active (14.6 × 10−8 mol gCo−1 s−1 at 210 °C; T50 = 224 °C), while the presence of Fe in Co3O4 inhibited its toluene activity. Regarding the combustion of propane, the introduction of Cu, Ni, and Fe had a negative effect on propane oxidation, while the presence of Mn in Co3O4 maintained its propane activity (6.1 × 10−8 mol gCo−1 s−1 at 160 °C; T50 = 201 °C). The excellent performance of Mn-doped Co3O4 could be attributed to the small grain size, high degree of strain, high surface area, and strong interaction between Mn and Co. Moreover, the presence of 4.4 vol.% H2O badly suppressed the activity of metal-doped catalysts for propane oxidation, among them, Fe-doped Co3O4 showed the best durability for wet propane combustion.

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“…This may be due to the formation of byproducts and adsorption on the surface of the catalyst, after a period of time, the generated byproducts desorbed from the surface of the catalyst. [ 53 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 13 ] Therefore, it is urgent to find a valid method to improve the catalytic performance of Co 3 O 4 catalysts. In order to further improve the catalytic performance of Co 3 O 4 catalyst, various hybrid cations (such as Mn 3+ , [ 14 ] Fe 3+ , [ 15 ] Ni 2+ , [ 16 ] La 3+ , [ 17 ] Al 3+ , [ 18 ] and In 3+[ [ 19 ] ] ) were recommended to form a mixed‐metal oxide with strong synergistic effect between Co and hybrid metal cations. For example, the addition of Mn gave Co 3 O 4 catalyst large surface area, rich cationic vacancy, and enhanced oxygen mobility, which greatly improved the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

Liu

Fan

Song

2020

Applied Organom Chemis

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Cobalt-based catalyst, as a typical catalyst for volatile organic compounds (VOCs) combustion, has attracted extensive attention. However, the catalytic activity of pure Co 3 O 4 is difficult to meet the requirements of practical application especially at low temperatures. Therefore, it is key to find an effective way to improve the catalytic performance of Co 3 O 4. In this paper, Co 3 O 4 is modified by engineering a combination of structural template and Ce dopant. The various characterization results verify that the template agent and the doping of appropriate Ce lead to great changes in the texture property and low temperature reducibility of Co 3 O 4 , thus resulting in superior catalytic performances of obtained mesoporous Ce x CoO catalysts. In particular, the best catalyst, Ce 0.05 CoO, achieves a toluene conversion of T 90% at 238 C, which is significantly lower than many of the Co-based catalysts reported in previous literatures. Furthermore, the toluene conversion rate maintains above 90% during 100 h at 238 C. The excellent catalytic performance of Ce 0.05 CoO can be attributed to its large specific surface area, uniform pore structure, good low temperature reducibility, and abundant surface oxygen species.

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Influence of CO addition on the toluene total oxidation over Co based mixed oxide catalysts

Cited by 60 publications

References 43 publications

Fabrication of CuO/TiO₂/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Fabrication of CuO/TiO₂/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

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Influence of CO addition on the toluene total oxidation over Co based mixed oxide catalysts

Cited by 60 publications

References 43 publications

Fabrication of CuO/TiO2/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Fabrication of CuO/TiO2/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Comparison of Different Metal Doping Effects on Co3O4 Catalysts for the Total Oxidation of Toluene and Propane

Preparation of mesoporous CexCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping

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Fabrication of CuO/TiO₂/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Fabrication of CuO/TiO₂/Ti Monolithic Catalyst for Efficient and Stable CO Oxidation

Preparation of mesoporous Ce_xCoO as highly effective catalysts for toluene combustion: The synergetic effects of structural template and Ce doping