Synthesis of highly efficient Mn 2 O 3 catalysts for CO oxidation derived from Mn-MIL-100

Zhang, Xiaodong; Li, Hongxin; Hou, Fulin; Yang, Yang; Han, Dong; Liu, Ning; Wang, Yuxin; Cui, Lifeng

doi:10.1016/j.apsusc.2017.03.179

Cited by 185 publications

(46 citation statements)

References 36 publications

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“…The XPS spectra of Fe p 3/2 at about 711.1 eV and satellite peak at 717.5 eV were assigned to characteristic peak of Fe 2 O 3 [18]. Figure 5 showed the XPS spectra of Mn 2p, in which the peaks located at about 641.6 eV can be assigned to Mn 2p 3/2 of Mn 2 O 3 [19]. Rh 3d spectra is given in Fig.…”

Section: Resultsmentioning

confidence: 95%

Effect of Fe impregnation sequence on ethanol synthesis from syngas over Mn and Fe promoted Rh/γ-Al2O3

Qian

2017

Appl Petrochem Res

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Fe promoted Rh-Mn/Al 2 O 3 catalysts with different Fe impregnation sequences were used for ethanol formation from syngas. The effect of Fe impregnation sequence on the structure and performance of the catalysts was investigated by means of N 2 adsorption, CO adsorption, H 2 -TPR, H 2 -TPD, CO-TPD, XPS and DRIFTS. The results showed that the RhMnFe/Al 2 O 3 catalyst prepared by co-impregnation method showed higher ethanol selectivity than those prepared by sequential impregnation methods. Characterization results indicated that the RhMnFe/Al 2 O 3 catalyst exhibited moderate CO hydrogenation and dissociation ability, stronger CO insertion ability and synergistic effect, which was responsible for its higher ethanol selectivity.

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Section: Resultsmentioning

confidence: 95%

Effect of Fe impregnation sequence on ethanol synthesis from syngas over Mn and Fe promoted Rh/γ-Al2O3

Qian

2017

Appl Petrochem Res

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“…[25] Therefore, the calcination temperature had as ignificant effect on the crystal-type transformation of the Mn-MIL-100 precursor. All diffraction peaks of the obtained materials could be reasonably assigned to (101), (112), (103), (211), (004), (220), (105), (321), (224), and( 400) planes of Mn 3 O 4 (JCPDS PDF 80-0382), whichi ndicated that previousc atalysts transformed into crystalline Mn 3 O 4 at 350 8C.…”

Section: Characterizationo Fa Morphouscatalystsmentioning

confidence: 99%

Facile Synthesis of Highly Efficient Amorphous Mn‐MIL‐100 Catalysts: Formation Mechanism and Structure Changes during Application in CO Oxidation

Zhang

et al. 2018

Chemistry A European J

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A comprehensive study was carried out on amorphous metal-organic frameworks Mn-MIL-100 as efficient catalysts for CO oxidation. This study focused on explaining the crystalline-amorphous-crystalline transformations during thermolysis of Mn-MIL-100 and studying the structure changes during the CO oxidation reaction. A possible formation mechanism of amorphous Mn-MIL-100 was proposed. Amorphous Mn-MIL-100 obtained by calcination at 250 °C (a-Mn-250) showed a smaller specific surface area (4 m g ) but high catalytic activity. Furthermore, the structure of amorphous Mn-MIL-100 was labile during the reaction. When a-Mn-250 was treated with reaction atmosphere at high temperature (giving used-a-Mn-250-S), the amorphous catalysts transformed into Mn O . Meanwhile, the BET surface area (164 m g ) and catalytic performance both sharply increased. In addition, used-a-Mn-250-S catalyst transformed from Mn O into Mn O , and this resulted in a slight decrease of catalytic activity in the presence of 1 vol % water vapor in the feed stream. A schematic mechanism of the structure changes during the reaction process was proposed. The success of the synthesis relies on the increase in BET surface area by using CO as retreatment atmosphere, and the enhanced catalytic activity was attributed to the unique structure, a large quantity of surface active oxygen species, oxygen vacancies, and good low-temperature reduction behavior.

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“…The particles of CuMn RC1 catalyst was least agglomerated, highly porous, uniformly distributed, and had a higher surface area. The choice of precursors in the CuMnOx catalysts lead to the change of surface distribution of Cu, Mn and O elements, which might be related to the CO oxidation [36][37][38]. Thus, the different precursors used in the The synergetic effect of CuMn RC1 catalyst was highly dependent upon the catalyst composition and the nature of oxidized compounds.…”

Section: Morphology Analysismentioning

confidence: 99%

The choice of precursors in the synthesizing of CuMnOx catalysts for maximizing CO oxidation

2018

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The hopcalite (CuMnOx) catalyst is a well-known catalyst for CO oxidation at a low temperature and it is synthesized by the co-precipitation method with different types of precursors. Activity of the CuMnOx catalysts for CO oxidation is strongly dependent upon the combination of precursors, ranking in order {Mn(Ac) 2 + Cu(NO 3 ) 2 } > {Mn(Ac) 2 + Cu(Ac) 2 } > {Mn(N O 3 ) 2 + Cu(NO 3 ) 2 } > {Mn(NO 3 ) 2 + Cu(AC) 2 }. All the precursors were precipitated by KMnO 4 solution and the precursors mostly comprised of MnO 2 , Mn 2 O 3 and CuO phases. Keeping the same precipitant while changing the precursors caused a change in the lattice oxygen mobility which influenced the CO oxidation activity. The calcination strategy of the precursors has great influence on the activity of resulting catalysts. The reactive calcination (RC) conditions produce multifarious phenomena of CO oxidation and the precursor decomposition in a single-step process. The activity order of the catalysts for CO oxidation was as follows: reactive calcination (RC) > flowing air > stagnant air. Therefore, we recommended that the RC route was the more appropriate calcination route for the production of highly active CuMnOx catalysts. All the catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis, X-ray photoelectron spectroscopy and scanning electron microscopy technique. The influence of precursors on the structural properties and the catalytic activity of co-precipitation derived binary CuMnOx catalysts for CO oxidation has been investigated.

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Synthesis of highly efficient Mn 2 O 3 catalysts for CO oxidation derived from Mn-MIL-100

Cited by 185 publications

References 36 publications

Effect of Fe impregnation sequence on ethanol synthesis from syngas over Mn and Fe promoted Rh/γ-Al2O3

Effect of Fe impregnation sequence on ethanol synthesis from syngas over Mn and Fe promoted Rh/γ-Al2O3

Facile Synthesis of Highly Efficient Amorphous Mn‐MIL‐100 Catalysts: Formation Mechanism and Structure Changes during Application in CO Oxidation

The choice of precursors in the synthesizing of CuMnOx catalysts for maximizing CO oxidation

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