Rod-, flower-, and dumbbell-like MnO2: Highly active catalysts for the combustion of toluene

Shi, Fang; Wang, Fang; Dai, Hongxing; Dai, Jianxing; Deng, Jiguang; Liu, Yuxi; Bai, Guangmei; Ji, Kemeng; Au, Chak Tong

doi:10.1016/j.apcata.2012.05.016

Cited by 140 publications

(63 citation statements)

References 48 publications

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“…As we can see, the catalytic activity is not consistent with the changing trend of the activation energy as usual. Shi et al (2012) had found the same phenomenon as we did, in which the best catalyst owned the highest E a value among the three synthetic samples.…”

Section: Calculation Of E a Valuesupporting

confidence: 63%

Effect of MnO2 Crystalline Structure on the Catalytic Oxidation of Formaldehyde

Lin

Chen

et al. 2017

Aerosol Air Qual. Res.

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Manganese oxides prove to be a promising catalyst for formaldehyde (HCHO) elimination in catalytic oxidation. In this study, MnO 2 with different crystalline structure (α-MnO 2 , β-MnO 2 , γ-MnO 2 , and δ-MnO 2 ) were synthesized by hydrothermal method to investigate their catalytic performances towards the abatement of formaldehyde. The prepared catalysts were characterized and analyzed by the X-ray diffraction (XRD), hydrogen-temperature programmed reduction (H 2 -TPR), BET specific surface area, X-ray photoelectron spectroscopy (XPS), and ammonia-temperature programmed desorption (NH 3 -TPD). In addition, the apparent activation energy was also calculated by using Arrhenius plots. Among the above four prepared catalysts, the γ-MnO 2 has the best destruction and removal efficiency (DRE), which was approaching to 100% for HCHO at 155°C. The catalytic activity of γ-MnO 2 is associated with abundant mesopores, higher reducibility of surface oxygen species, and more oxygen vacancies as compared to other types of crystalline MnO 2 .

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Section: Calculation Of E a Valuesupporting

confidence: 63%

Effect of MnO2 Crystalline Structure on the Catalytic Oxidation of Formaldehyde

Lin

Chen

et al. 2017

Aerosol Air Qual. Res.

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“…MnO 2 exhibited good catalytic performance in many fields because of its multivalent and polycrystalline type [9][10][11]. For example, Shi et al pointed out that ␣-MnO 2 and -MnO 2 showed good catalytic activities in the combustion of toluene [11].…”

Section: Introductionmentioning

confidence: 98%

“…For example, Shi et al pointed out that ␣-MnO 2 and -MnO 2 showed good catalytic activities in the combustion of toluene [11]. Liang et al found that ␣-MnO 2 and ␦-MnO 2 were active for CO oxidation [9].…”

Section: Introductionmentioning

confidence: 98%

Selective catalytic oxidation of ammonia to nitrogen over MnO2 prepared by urea-assisted hydrothermal method

Fan

Zhong

et al. 2015

Applied Surface Science

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“…10). It is well-known that the catalytic combustion of organic compounds over transition metal oxides involves a Mars-van Krevelen mechanism, where the organic molecules are primarily oxidized by the lattice oxygen of metal oxides, the latter being re-oxidized by the adsorbed oxygen [59,60]. Therefore, both the gas-phase oxygen adsorption capability and oxygen transfer rate between O sur.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

Catalytic behavior and synergistic effect of nanostructured mesoporous CuO-MnOx-CeO2 catalysts for chlorobenzene destruction

Shen

et al. 2014

Applied Surface Science

107

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a b s t r a c tMesoporous CuO-MnO x -CeO 2 composite metal oxides with different copper and manganese loadings were prepared by a urea-assistant hydrothermal method, and were further adopted for the complete catalytic combustion of chlorobenzene. The effects of reaction conditions such as inlet reagent concentration and water feed concentration on chlorobenzene combustion were also studied. The structure and textural properties of the synthesized catalysts were characterized via the XRD, N 2 adsorption/desorption, FE-SEM, TEM, H 2 -TPR, O 2 -TPD, and XPS techniques. The characterization results reveal that the presence of a small amount of Mn species can facilitate the incorporation of Cu and Mn ions into ceria lattice to form Cu-Mn-Ce-O solid solution. The synergistic effect of Cu and Mn species can reduce the redox potential of the composite catalysts, and produce large amounts of oxygen vacancies in the interface of CuO x , MnO x , and CeO 2 oxides. The catalyst with Cu/Mn atomic ratio of 1/1 exhibits the best chlorobenzene elimination capability, oxidizing about 95% of the inlet chlorobenzene at 264• C with CO 2 selectivity higher than 99.5%. The concentration and mobility of the chemically adsorbed oxygen are vital for the effective removal of surface Cl species, which inhibits the dissociation of oxygen molecules and decreases the reducibility of the copper and manganese species. It can be rationally concluded that the superior catalytic performance and durability of the mesoporous CuO-MnO x -CeO 2 composite oxides are primarily attributed to the higher surface oxygen concentration and better active oxygen mobility.

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Rod-, flower-, and dumbbell-like MnO2: Highly active catalysts for the combustion of toluene

Cited by 140 publications

References 48 publications

Effect of MnO2 Crystalline Structure on the Catalytic Oxidation of Formaldehyde

Effect of MnO2 Crystalline Structure on the Catalytic Oxidation of Formaldehyde

Selective catalytic oxidation of ammonia to nitrogen over MnO2 prepared by urea-assisted hydrothermal method

Catalytic behavior and synergistic effect of nanostructured mesoporous CuO-MnOx-CeO2 catalysts for chlorobenzene destruction

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