A facile synthesis for cauliflower like CeO2 catalysts from Ce-BTC precursor and their catalytic performance for CO oxidation

Zhang, Xiaodong; Hou, Fulin; Yang, Yang; Wang, Yuxin; Liu, Ning; Chen, Dan; Yang, Yiqiong

doi:10.1016/j.apsusc.2017.06.235

Cited by 168 publications

(54 citation statements)

References 40 publications

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“…[20] Figure ). When the 480 cm −1 sharp peak appeared, the intensity of shoulder peak became dramatically weak . Similar situation can also be found in this research, all shoulder peaks were not very large and it's very difficult to evaluate the difference of samples defects basing on this.…”

Section: Resultssupporting

confidence: 72%

“…The reaction rates at 250 °C normalized per gram (r 250°C ) and per unit surface area (R 250°C ) are calculated to enable the comparison of the catalytic activity of the different samples using the conversions below 20 %, as listed in Table . The least active sample A is with r 250°C =9.08×10 −6 mol/s⋅g and R 250°C =1.24×10 −7 mol/s⋅m 2 , nevertheless higher than the values (6.42×10 −6 mol/s⋅g, 2.32×10 −8 mol/s⋅m 2 ) of the best sample CeB/AO/F127‐STE we reported before and other CO oxidation rates ,. The best sample MW+P has an even better catalytic activity, with r 250°C =1.90×10 −5 mol/s⋅g and R 250°C =3.97×10 −7 mol/s⋅m 2 .…”

Section: Resultsmentioning

confidence: 52%

“…Sample MW+UV and MW+US+UV showed higher H 2 consumption amount (about 11.20 cm 3 /g), which may be caused by the thinner layer and more oxygen on the surface (see Figure ). The increase of Ce 3+ or oxygen vacancies on the surface caused the shift of starting point to lower temperature . The starting points of MW+UV was 325 °C while the temperature of sample MW and MW+P shifted to 250 °C, indicating the latter two has more surface Ce 3+ or surface oxygen vacancies, and these two also showed good catalytic activity in the following catalytic reactions.…”

Section: Resultsmentioning

confidence: 97%

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Large Dimensional CeO₂ Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

Ding

Yang

et al. 2018

ChemCatChem

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Large nano-structured flakes of CeO 2 (20-80 nm in thickness, up to 5.6 mm in diameter) were synthesized by a combination of microwave (MW), ultraviolet (UV) and ultrasound (US), with or without pressure (P). The CeO 2 structures were systematically examined by XRD, SEM, N 2 sorption, HRTEM, XPS, Raman and H 2 -TPR. The synthesized CeO 2 nanoflakes were composed by 3.0-7.5 nm nanoparticles with the (111) surface exposed, and laminated to nanoflakes with 3.42-3.85 nm nano-channels in between. MW-assisting was beneficial to form a higher surface Ce 3 + /(Ce 3 + + Ce 4 + ) ratio and surface oxygen vacancies during short synthesis procedure. A Raman peak at 480 cm À1 correlating with bulk Ce 3 + was detected. H 2 -TPR found MW and MW + P had more surface Ce 3 + (surface oxygen vacancies). CO oxidation and imine conversion proved that MW + P was the optimum condition to produce highly active CeO 2 nanoflakes. The much better catalytic performance than CeO 2 from solvothermal preparation, due to the larger channel gap (3.85 nm),a higher Ce 3 + /(Ce 3 + + Ce 4 + ) ratio (32 %) and more surface oxygen vacancies on the particles of the organized flake structures.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 97%

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Large Dimensional CeO₂ Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

Ding

Yang

et al. 2018

ChemCatChem

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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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“…MOFs have attracted much attention as precursors for nanoporous metal oxides [27][28][29][30]. Abney et al [31] levered the advantageous properties of a sacrificial MOF template to form a series of CuO-CeO 2 catalyst systems displaying enhanced CO oxidation performance.…”

Section: Introductionmentioning

confidence: 99%

Effects of Preparation Method on the Structure and Catalytic Activity of Ag–Fe2O3 Catalysts Derived from MOFs

Zhang

Yang

et al. 2017

Catalysts

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Abstract:In this work, Ag-Fe 2 O 3 catalysts were successfully prepared using several different methods. Our main intention was to investigate the effect of the preparation methods on the catalysts' structure and their catalytic performance for CO oxidation. The catalysts were characterized by X-ray diffraction (XRD), N 2 adsorption-desorption, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), H 2 -temperature program reduction (H 2 -TPR) and inductively coupled plasma optical emission spectroscopy (ICP-OES). Ag-Fe catalysts prepared by impregnating Ag into MIL-100 (Fe) presented the best catalytic activity, over which CO could be completely oxidized at 160 • C. Based on the characterization, it was found that more metallic Ag species and porosity existed on Ag-Fe catalysts, which could efficiently absorb atmospheric oxygen and, thus, enhance the CO oxidation.

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A facile synthesis for cauliflower like CeO2 catalysts from Ce-BTC precursor and their catalytic performance for CO oxidation

Cited by 168 publications

References 40 publications

Large Dimensional CeO₂ Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

Large Dimensional CeO₂ Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

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

Effects of Preparation Method on the Structure and Catalytic Activity of Ag–Fe2O3 Catalysts Derived from MOFs

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A facile synthesis for cauliflower like CeO2 catalysts from Ce-BTC precursor and their catalytic performance for CO oxidation

Cited by 168 publications

References 40 publications

Large Dimensional CeO2 Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

Large Dimensional CeO2 Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

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

Effects of Preparation Method on the Structure and Catalytic Activity of Ag–Fe2O3 Catalysts Derived from MOFs

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Product

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Large Dimensional CeO₂ Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity

Large Dimensional CeO₂ Nanoflakes by Microwave‐Assisted Synthesis: Lamellar Nano‐Channels and Surface Oxygen Vacancies Promote Catalytic Activity