Catalytic oxidation of toluene over nanorod-structured Mn–Ce mixed oxides

Liao, Yinnian; Fu, Mingli; Chen, Limin; Wu, Junliang; Huang, Bichun; Ye, Daiqi

doi:10.1016/j.cattod.2013.06.017

Cited by 146 publications

(68 citation statements)

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“…Compared with other oxides and metals that can be mixed with CeO 2 , MnO x can increase the stability of the catalyst [6], and is less expensive than other metals (Ag, Au, Pt, Pd) that can increase the activity of ceria [13][14][15][16]. Cen et al [17], Gupta et al [18], and Tang et al [19] all showed that the addition of Mn to the ceria surface increases the reducibility of the surface.…”

Section: Introductionmentioning

confidence: 96%

“…Density functional theory (DFT) studies have suggested that Mn can be doped into the fluorite lattice of ceria when there are oxygen vacancies present [3], and Mn-doped CeO 2 will have a high rate for oxidation of methane [4]. MnO x /CeO 2 has also been shown to oxidize volatile organic compounds [5], toluene [6], tars (C 10 H 8 ) [7], hydrocarbons with chlorine (trichlorophenol [8] and trichloroethylene [1]), and CO [9]. Though the ability of Mn-doped CeO 2 to oxidize hydrocarbons is well established, the lack of mechanistic information limits further active site optimization.…”

Section: Introductionmentioning

confidence: 97%

“…MnO x and CeO x combined nanorod structures were very active for the total oxidation of toluene to CO 2 at temperatures as low as 225°C [6]. The catalytic activity of the total oxidation of n-hexane on MnO x /CeO x supported on alumina is also high [11].…”

Section: Introductionmentioning

confidence: 98%

“…A number of studies have demonstrated that MnO x /CeO x mixed oxides have activity for hydrocarbon oxidation and stability at high temperatures (over 1000 K) [6]. MnO x and CeO x combined nanorod structures were very active for the total oxidation of toluene to CO 2 at temperatures as low as 225°C [6].…”

Section: Introductionmentioning

confidence: 99%

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Catalytic propane reforming mechanism over Mn-Doped CeO2 (111)

Krcha

Janik²

2015

Surface Science

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a b s t r a c t a r t i c l e i n f o Available online xxxx Keywords: Ceria DFT + U Manganese Doped oxide ReformingMnO x /CeO x mixed oxide systems exhibit encouraging hydrocarbon oxidation activity, without the inclusion of a noble metal. Using density functional theory (DFT) methods, we examined the oxidative reforming path of propane over the Mn-doped CeO 2 (1 1 1) surface. A plausible set of elementary reaction steps are identified for conversion of propane to CO/CO 2 and H 2 /H 2 O over the oxide surface. The rate-limiting reaction process may vary with redox conditions, with C-H dissociation limiting under more oxidizing conditions and more complex reaction sequences, including surface re-oxidation, limiting under highly reducing conditions. The possibility of intermediate desorption from the surface during the reforming process is low, with desorption energies of the intermediates being much less favorable than further surface reactions until CO/CO 2 products are formed. The reforming paths over Mn-doped ceria are similar to those previously identified over Zr-doped ceria. The extent of surface reduction and the electronic structure of the surface intermediates are examined.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Catalytic propane reforming mechanism over Mn-Doped CeO2 (111)

Krcha

Janik²

2015

Surface Science

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“…The 12.5%-Ce-Mn oxide was the most active sample. The oxidation of toluene over nanorod-shaped Mn-Ce mixed oxides prepared by hydrothermal treatment was studied by Liao et al [17]. The highest activity was observed for the samples with a high manganese content.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Activity of MnOx-CeO2 Catalysts in Ethanol Oxidation

Delimaris

Ioannides

2017

Catalysts

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MnO x -CeO 2 mixed oxides are considered efficient oxidation catalysts superior to the corresponding single oxides. Although these oxides have been the subject of numerous studies, their fundamental performance indicators, such as turnover frequency (TOF) or specific activity, are scarcely reported. The purpose of the present work is to investigate the effect of catalyst composition on the concentration of active sites and intrinsic activity in ethanol oxidation by the employment of temperature-programmed desorption and oxidation of isotopically-labelled ethanol, 12 CH 3 13 CH 2 OH.The transformation pathways of preadsorbed ethanol in the absence of gaseous oxygen refer to dehydrogenation to acetaldehyde followed by its dissociation combined with oxidation by lattice oxygen. In the presence of gaseous oxygen, lattice oxygen is rapidly restored and the main products are acetaldehyde, CO 2 , and water. CO 2 forms less easily on mixed oxides than on pure MnO x . The TOF of ethanol oxidation has been calculated assuming that the amount of adsorbed ethanol and CO 2 produced during temperature-programmed oxidation (TPO) is a reliable indicator of the concentration of the active sites.

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Controllable construction of Ce‐Mn‐O_x with tunable oxygen vacancies and active species for toluene catalytic combustion

Huang

Zhao

Song

et al. 2020

Applied Organom Chemis

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A series of Ce‐Mn‐Ox catalysts synthesized under different hydrothermal conditions were evaluated by catalytic removal of toluene. The results of characterization showed that the contents of oxygen vacancies and active species in catalysts were crucial for the catalytic oxidation process. The concentration of Ce3+, Mn3+, and adsorbed oxygen associated with structural defects in Ce‐Mn‐Ox catalysts could be controlled by hydrothermal conditions, which were considered to promote redox capacity and improve catalytic oxidation performance. In addition, suitable synthetic conditions could increase the SBET and Vp of catalysts. Among the prepared catalysts, CM‐100 showed the best catalytic performance due to the generation of more defective oxygen and active species (Ce3+, Mn3+, and surface‐adsorbed oxygen). In addition, the CM‐100 catalyst showed satisfactory water resistance and stability.

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Catalytic oxidation of toluene over nanorod-structured Mn–Ce mixed oxides

Cited by 146 publications

References 50 publications

Catalytic propane reforming mechanism over Mn-Doped CeO2 (111)

Catalytic propane reforming mechanism over Mn-Doped CeO2 (111)

Intrinsic Activity of MnOx-CeO2 Catalysts in Ethanol Oxidation

Controllable construction of Ce‐Mn‐O_x with tunable oxygen vacancies and active species for toluene catalytic combustion

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Catalytic oxidation of toluene over nanorod-structured Mn–Ce mixed oxides

Cited by 146 publications

References 50 publications

Catalytic propane reforming mechanism over Mn-Doped CeO2 (111)

Catalytic propane reforming mechanism over Mn-Doped CeO2 (111)

Intrinsic Activity of MnOx-CeO2 Catalysts in Ethanol Oxidation

Controllable construction of Ce‐Mn‐Ox with tunable oxygen vacancies and active species for toluene catalytic combustion

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Product

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Controllable construction of Ce‐Mn‐O_x with tunable oxygen vacancies and active species for toluene catalytic combustion