Low-temperature catalytic oxidation of toluene over nanocrystal-like Mn–Co oxides prepared by two-step hydrothermal method

Qu, Zhenping; Gao, Kang; Fu, Qiang; Qin, Yuan

doi:10.1016/j.catcom.2014.03.035

Cited by 96 publications

(38 citation statements)

References 18 publications

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“…In addition, the catalytic activities of typical samples for toluene oxidation are summarized in Table 2. Evidently, the catalytic activity over the α-MnO2@Co3O4 hybrid catalyst is considerably better than those previous reported for other catalysts, such as Mn10Cu1-S (T90% = 258 °C) [45], Mn-Co (1:1) (T90% = 249 °C) [46], 7.4Au/Co3O4 (T90% = 250 °C) [47], 1% Pt/Al2O3 (T90% = 258 °C) [48], 0.12Ag/Mn2O3-redn (T90% = 250 °C) [49], and Pd/Co3AlO (T90% = 230 °C) [31].…”

Section: Catalytic Activity and Stabilitycontrasting

confidence: 67%

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Ren

Fan

et al. 2020

Chinese Journal of Catalysis

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Herein, a bottom-down design is presented to successfully fabricate ZIF-derived Co3O4, grown in situ on a one-dimensional (1D) α-MnO2 material, denoted as α-MnO2@Co3O4. The synergistic effect derived from the coupled interface constructed between α-MnO2 and Co3O4 is responsible for the enhanced catalytic activity. The resultant α-MnO2@Co3O4 catalyst exhibits excellent catalytic activity at a T90% (temperature required to achieve a toluene conversion of 90%) of approximately 229 o C, which is 47 and 28 °C lower than those of the pure α-MnO2 nanowire and Co3O4-b obtained via pyrolysis of ZIF-67, respectively. This activity is attributed to the increase in the number of surface-adsorbed oxygen species, which accelerate the oxygen mobility and enhance the redox pairs of Mn 4+ /Mn 3+ and Co 2+ /Co 3+ . Moreover, the result of in situ diffuse reflectance infrared Fourier transform spectroscopy suggests that the gaseous oxygen could be more easily activated to adsorbed oxygen species on the surface of α-MnO2@Co3O4 than on that of α-MnO2. The catalytic reaction route of toluene oxidation over the α-MnO2@Co3O4 catalyst is as follows: toluene → benzoate species → alkanes containing oxygen functional group → CO2 and H2O. In addition, the α-MnO2@Co3O4 catalyst shows excellent stability and good water resistance for toluene oxidation. Furthermore, the preparation method can be extended to other 1D MnO2 materials. A new strategy for the development of high-performance catalysts of practical significance is provided.

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Section: Catalytic Activity and Stabilitycontrasting

confidence: 67%

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Ren

Fan

et al. 2020

Chinese Journal of Catalysis

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“…As shown in Figure 7, the CoCe-MA catalyst exhibited the best catalytic performance. The catalytic activity of the CoCe-MA catalyst was extensively compared with other representative catalysts used for toluene oxidation in the literature [26,[48][49][50][51][52], as displayed in Table 7. Table 7 shows that the T 90 values of most catalysts in toluene conversion were higher than that of the CoCe-MA catalyst.…”

Section: Discussionmentioning

confidence: 99%

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

et al. 2019

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Cobalt cerium oxide catalysts with small molecular organic acids (SOAs) as chelating agents were prepared via the sol–gel method and investigated for the complete oxidation of toluene. Four kinds of natural SOAs, i.e. malic acid (MA), citric acid (CA), glycolic acid (GA), and tartaric acid (TA), were selected. The effect of organic acids on the composition, structure, morphology and catalytic performance of metal oxides is discussed in details. The cobalt cerium oxides catalysts were characterized by various techniques, including TG–DSC, XRD, SEM–EDS, N2–adsorption and desorption, XPS, and H2–TPR analyses. The results show that the nature of organic acids influenced the hydrolysis, condensation and calcination processes, as well as strongly affected the textural and physicochemical properties of the metal oxides synthesized. The best catalytic activity was obtained with the CoCe–MA catalyst, and the toluene conversion reached 90% at 242 °C. This outstanding catalytic activity could be related to its textural, redox properties and unique surface compositions and oxidation states. In addition, the CoCe–MA catalyst also showed excellent stability in long–time activity test.

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“…Co3O4-CeO2 catalyst, the reduction peaks become weak, while shoulder peaks can be found near 600 °C, which can be attributed to the interaction between Co and Ce [17]. For catalysts treated with formic acid, the reduction peaks become weaker, suggesting that the content of Co species decreased and is consistent with the results of ICP-AES; meanwhile, the reduction peaks move to lower temperatures, which can be attributed to the porous structures and higher surface areas, as suggested by BET.…”

Section: Temperature-programmed Reduction (Tpr)mentioning

confidence: 96%

Formic Acid Modified Co3O4-CeO2 Catalysts for CO Oxidation

et al. 2016

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Abstract:A formic acid modified catalyst, Co 3 O 4 -CeO 2 , was prepared via facile urea-hydrothermal method and applied in CO oxidation. The Co 3 O 4 -CeO 2 -0.5 catalyst, treated by formic acid at 0.5 mol/L, performed better in CO oxidation with T 50 obtained at 69.5˝C and T 100 obtained at 150˝C, respectively. The characterization results indicate that after treating with formic acid, there is a more porous structure within the Co 3 O 4 -CeO 2 catalyst; meanwhile, despite of the slightly decreased content of Co, there are more adsorption sites exposed by acid treatment, as suggested by CO-TPD and H 2 -TPD, which explains the improvement of catalytic performance.

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Low-temperature catalytic oxidation of toluene over nanocrystal-like Mn–Co oxides prepared by two-step hydrothermal method

Cited by 96 publications

References 18 publications

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Enhancing catalytic toluene oxidation over MnO2@Co3O4 by constructing a coupled interface

Effect of Small Molecular Organic Acids on the Structure and Catalytic Performance of Sol–Gel Prepared Cobalt Cerium Oxides towards Toluene Combustion

Formic Acid Modified Co3O4-CeO2 Catalysts for CO Oxidation

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