The surface properties and the activities in catalytic wet air oxidation over CeO2–TiO2 catalysts

Yang, Shaoxia; Zhu, Wanpeng; Jiang, Zhanpeng; Chen, Zhengxiong; Wang, Jiangbing

doi:10.1016/j.apsusc.2005.11.067

Cited by 258 publications

(137 citation statements)

References 28 publications

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“…For pure titania, the characteristic peaks of the anatase and the rutile phases are clearly evidenced with a slightly larger proportion of anatase. On the other hand, the brookite phase has not been detected in any case [8][9][10]. The intensity of the anatase characteristic peaks decreases when the amount of cerium increases, also a small broadening along with a slight shift towards larger angles (see Table 3) is observed for these characteristic reflections.…”

Section: X-ray Diffractionmentioning

confidence: 95%

Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Rico-Francés

Jardim

Wezendonk

et al. 2016

Applied Catalysis B: Environmental

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Section: X-ray Diffractionmentioning

confidence: 95%

Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Rico-Francés

Jardim

Wezendonk

et al. 2016

Applied Catalysis B: Environmental

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“…In the case of CZ (20), the adsorption was only 14 % of the BPA removal. The catalytic activity of CZ (20) is related to the highest chemisorbed oxygen concentration of the support (Table 4) which promotes the oxidation reaction on the surface of the catalyst [18]. The addition of an active metal to the supports has no effect on the removal of BPA from the aqueous solution, except in the case of A/C(100)w (Fig.…”

Section: Catalytic Wet Air Oxidation Of Bpamentioning

confidence: 98%

“…4) can be split into three components. The lowest binding energy at around 528.2-529.5 eV corresponds to the lattice oxygen (marked with O I ) while O II at a binding energy around 530 eV is related to chemisorbed oxygen, which has been found to be the most active oxygen species on the surface of the catalyst [18]. The third oxygen component (O III ) at a binding energy of around 532 eV refers to the oxygen of CO 3 2-groups [27].…”

Section: Xps Analysismentioning

confidence: 98%

“…However, the additional separation step of the homogeneous catalysts has made them less interesting and the development of active heterogeneous catalysts has received more attention in the research area of CWAO. Numerous heterogeneous catalysts such as activated carbon, CeO 2 , TiO 2 , MnO 2 , ZrO 2 and their mixed oxides [12][13][14][15][16][17][18] have been tested in the CWAO of phenol, acetic acid and industrial effluents. Moreover, noble metals (Pt, Ru, Pd) supported on mixed oxides have been found to be the most efficient catalysts in CWAO of different effluents than pure metal oxides [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

Heponiemi

Azalim

et al. 2015

Top Catal

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Catalytic wet air oxidation of an aqueous solution, bisphenol A (BPA), was carried out at 160°C and at 20 bar of air in a batch reactor. Silver catalysts (2.5 wt%) prepared by wet impregnation and complexation on commercial CeO 2 in addition to Ce 0.85 Zr 0.15 O 2 and Ce 0.2 Zr 0.8 O 2 sol-gel mixed oxides were synthesized and used as catalysts in the reaction. Characterizations of the catalysts were performed by using FESEM, XRD, BET, XPS and ICP-OES techniques. Residual BPA concentration was analyzed by using an UV-Vis technique and organic compound content was measured via the total organic carbon method. Commercial CeO 2 showed a smaller specific surface area and a larger crystallite size than laboratory prepared Ce-Zr mixed oxides. The highest BPA removal (76 %) was achieved after 3 h with CeO 2 , Ce 0.85 Zr 0.15 O 2 and Ag/Ce 0.85 Zr 0.15 O 2 catalysts revealing that the addition of silver had no effect on the catalytic activity of the pure supports. However, the loading of active metal to the supports by complexation decreased the adsorption of the BPA during the heating period and hence the Ag/Ce 0.85 Zr 0.15 O 2 prepared via complexation was the most active catalyst with only 1 % adsorption of BPA. Moreover, the activity of the catalysts was not related to the surface area of the samples. According to the ICP-OES analysis of the terminal water samples, leaching of the silver was occurred during oxidation experiments explaining the behavior of Ag catalysts in the reaction.

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“…The Ce 3dp5/2 spectra can be divided into four characteristic peaks at 882.5 eV (Ce 4+ ), 885.8 eV (Ce 3+ ), 888.8 eV (Ce 3+ ), and 898.3 eV (Ce 2+ ), respectively, while the Ce3d3/2 spectra can also be divided into four characteristic peaks at 901.4 eV (Ce 4+ ), 903.8 eV (Ce 3+ ), 907.3 eV (Ce 4+ ), and 916.8 eV (Ce 4+ ), respectively. The coexistence of Ce 2+ , Ce 3+ , and Ce 4+ can create a charge imbalance, vacancies, and unsaturated chemical bonds on the catalyst's surface [52] and, as a result, can increase the SCR activity of the catalyst [53]. Among these cerium oxides, CeO 2 has been proven as the most effective oxide type of cerium for SCR activity, which was the main valence state in the 9%Ce(0.3)-Mn/TiO 2 -0.8%GO catalyst.…”

Section: Xps Characterizationmentioning

confidence: 99%

The CeOX and MnOX Nanocrystals Supported on TiO2–Graphene Oxide Catalysts and Their Selective Catalytic Reduction Properties at Low Temperature

Tong

Song

2017

Crystals

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Abstract:A series of 9%CeO x -MnO x /TiO 2 -GO nanocomposites with different molar ratios of Ce/Mn were synthesized by the sol-gel and ultrasonic impregnation methods and characterized by field emission scanning electron microscope (FESEM), high resolution transmission electron microscopy (HRTEM), N 2 adsorption (BET) analysis, X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR). The results showed that various valences of Ce and Mn oxides were uniformly distributed on the surface of TiO 2 -GO multilayered supports. The coexistence of various valences of Ce and Mn oxides can improve the redox performance of the catalyst. With the introduction of Ce, the amount of MnO 2 and non-stoichiometric MnO x /Mn, the total oxygen and chemisorbed oxygen content, and the electron transfer ability of the catalyst increased significantly. When the molar ratio of Ce/Mn was 0.3, the catalysts exhibited high selective catalytic reduction activity (more than 99% at 180 • C) and N 2 selectivity. The presence of hydrophilic groups on the surface of the GO was considered as the critical factor influencing the H 2 O resistance of the catalyst. Due to the pre-sulfuring process of GO, serious sulfation of the active component can be prevented, and the catalyst exhibited excellent SO 2 resistance.

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The surface properties and the activities in catalytic wet air oxidation over CeO2–TiO2 catalysts

Cited by 258 publications

References 28 publications

Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Highly dispersed Pt+ on Ti Ce(1−)O2 as an active phase in preferential oxidation of CO

Cerium Oxide Based Catalysts for Wet Air Oxidation of Bisphenol A

The CeOX and MnOX Nanocrystals Supported on TiO2–Graphene Oxide Catalysts and Their Selective Catalytic Reduction Properties at Low Temperature

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