Catalytic oxidation of volatile organic compound over cerium modified cobalt-based mixed oxide catalysts synthesized by electrodeposition method

Wang, Jing; Yoshida, Akihiro; Wang, Peifen; Yu, Tiantang; Wang, Zhongde; Hao, Xiaogang; Abudula, Abuliti; Guan, Guoqing

doi:10.1016/j.apcatb.2020.118941

Cited by 80 publications

(46 citation statements)

References 46 publications

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“…However, cobalt introduction clearly alters the few top nanometers of the sup- respectively, 20,32 while the Co 3+ species usually appear at 780.0 eV or lower binding energies (a small shoulder in the XPS spectrum). [33][34][35][36][37][38][39][40][41][42][43] However, what is more important in this work is the amount of cobalt impregnated, since the next practical step in catalyst preparation would be reduction.…”

Section: Resultsmentioning

confidence: 99%

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

Cañón

Teplyakov

2021

Surface & Interface Analysis

109

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SiO2 and γ‐Al2O3 impregnation with nominal 10 and 20% of cobalt was examined using wet impregnation method starting with Co(NO3)2·6H2O. The samples were dried and analyzed by XPS prior to calcination to study the surface species in the solids and the role of the support in the processing of supported cobalt catalysts. The results showed that cobalt introduction alters the few top nanometers of the support materials as there are significant changes recorded in the XPS spectra. Most importantly, there is a remarkable similarity between the O 1s XPS signal of SiO2 and γ‐Al2O3 following Co 20% impregnation, which suggests that these materials could have similar properties in terms of the oxidation ability and the general redox behavior. The shift of Al 2p peaks to higher binding energy (BE) in the XPS investigations and the shift of Si 2p peaks to lower BE were observed for high nominal cobalt loading. These results suggest that the choice of the support in cobalt‐based catalysts would tune the chemical characteristics of cobalt in the final materials.

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Section: Resultsmentioning

confidence: 99%

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

Cañón

Teplyakov

2021

Surface & Interface Analysis

109

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“…The CO 2 selectivity profiles are displayed in Figure S4 and the detail temperatures of propane combustion are listed in Table 4. It was found that the CO 2 selectivity of xM‐Co 3 Mn 1 (x=0, 0.025, 0.05 and 0.1) also displayed the same upward trend during the oxidation process [42] . It was apparently found that the T C (the temperature when CO 2 yield reached 90 %) was almost identical to T 90 , which meant that no byproducts were produced, propane was absolutely oxidized to CO 2 and H 2 O [33] .…”

Section: Resultsmentioning

confidence: 78%

“…It was found that the CO 2 selectivity of xM- Co 3 Mn 1 (x = 0, 0.025, 0.05 and 0.1) also displayed the same upward trend during the oxidation process. [42] It was apparently found that the T C (the temperature when CO 2 yield reached 90 %) was almost identical to T 90 , which meant that no byproducts were produced, propane was absolutely oxidized to CO 2 and H 2 O. [33] At the same time, we compared other catalysts reported previously and listed in Table S2, believing that 0.05 M-Co 3 Mn 1 still had a considerable catalytic performance.…”

Section: Catalytic Performancementioning

confidence: 90%

Surface Modification of Cobalt‐Manganese Mixed Oxide and Its Application for Low‐Temperature Propane Catalytic Combustion

et al. 2021

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The CoÀ Mn mixed metal oxide was firstly fabricated using Co(NO 3) 2 , KMnO 4 and K 2 CO 3. The tuned catalysts, donated as xM-Co 3 Mn 1 (x = 0, 0.025, 0.05 and 0.1), were synthesized by selective dissolve method (SD). The physicochemical properties induced by different acid concentrations on catalysts were explored via a series of characterization techniques. Compared with the original material, the catalysts treated by SD had higher advantages in enriching crystal defects, surface Co 2 + and adsorbed oxygen species as well as increasing the specific surface areas (SSA). Among acid-treated catalysts, 0.05 M-Co 3 Mn 1 exhibited the best catalytic activity, while the T 50 and T 90 were 71 and 117°C lower than the original one. Meanwhile, 0.05 M-Co 3 Mn 1 showed excellent stability and great regeneration ability.

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“…It is generally accepted that O ads is one of the major factors affecting the catalytic oxidation activity of toluene by rease of promoting the degradation of carbon skeletons. [ 35,56 ] Figure 12 displays the relationship between toluene conversion and O ads concentrations, it is obviously observed that the higher the ratio of O ads /O latt , the lower T 50% and T 90% , which confirms that the presence of O ads will enhance the catalytic performance of catalyst. Therefore, it can be concluded that the enhanced catalytic performance of Ce x CoO, especially for Ce 0.05 CoO, may come from the improvement on the reducibility and the increase of active O ads species caused by Ce doping.…”

Section: Discussionmentioning

confidence: 91%

“…Generally, the lower crystalline degree represents more lattice defects. The lattice defects will generate more oxygen vacancies and facilitate the transfer and transfer of electrons, [ 35 ] which may promote the reveal of interior atoms and gives the catalyst larger surface area. Besides, no diffraction peaks from cerium oxide are observed, suggesting that CeO x species disperse evenly on the surface of Co 3 O 4.…”

Section: Resultsmentioning

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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Catalytic oxidation of volatile organic compound over cerium modified cobalt-based mixed oxide catalysts synthesized by electrodeposition method

Cited by 80 publications

References 46 publications

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

Surface Modification of Cobalt‐Manganese Mixed Oxide and Its Application for Low‐Temperature Propane Catalytic Combustion

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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Catalytic oxidation of volatile organic compound over cerium modified cobalt-based mixed oxide catalysts synthesized by electrodeposition method

Cited by 80 publications

References 46 publications

XPS characterization of cobalt impregnated SiO2 and γ‐Al2O3

XPS characterization of cobalt impregnated SiO2 and γ‐Al2O3

Surface Modification of Cobalt‐Manganese Mixed Oxide and Its Application for Low‐Temperature Propane Catalytic Combustion

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

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Product

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XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

XPS characterization of cobalt impregnated SiO₂ and γ‐Al₂O₃

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