Enhanced catalytic performance for CO preferential oxidation over CuO catalysts supported on highly defective CeO2 nanocrystals

Wang, Cheng; Cheng, Qingpeng; Wang, Xinlei; Ma, Kui; Bai, Xueqin; Tan, Sirui; Tian, Ye; Ding, Tao; Zheng, Lirong; Zhang, Jing; Li, Xingang

doi:10.1016/j.apsusc.2017.06.017

Cited by 64 publications

(43 citation statements)

References 63 publications

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“…X-ray Photoelectron-Spectroscopy Analysis of Catalysts XPS analysis was conducted to assess the impact of doping on elemental valence. Figure 5a shows the Ce 3d XPS spectra of cat-K/ZC, cat-CZ, and cat-ZC, which demonstrate the presence of eight components, as reported in several relevant studies [34][35][36][37][38][39][40][41]. The Ce 3d spectrum consists of two series of spin-orbit lines u and v. Figure 5a displays that Ce 3d 3/2 spin-obit components of cat-ZC which correspond to u lines include three characteristic peaks labeled as u (901.7 eV), u" (908.9 eV), and u Catalysts 2019, 9, x FOR PEER REVIEW phases coexist with CexZr1−xO2 solid solution, the ignition temperature o catalytic performance of the catalyst gets improved as presented in Figure 4a K/ZC exhibited an excellent effect and the ignition temperature was 351 C oxidation of soot was promoted by increasing the catalyst contact with the hi [15][16][17][18][19].…”

Section: Samples or Sootsupporting

confidence: 60%

“…2.1.5. X-ray Photoelectron-Spectroscopy Analysis of Catalysts XPS analysis was conducted to assess the impact of doping on elem shows the Ce 3d XPS spectra of cat-K/ZC, cat-CZ, and cat-ZC, which dem eight components, as reported in several relevant studies [34][35][36][37][38][39][40][41]. The Ce 3d series of spin-orbit lines u and v. Figure 5a displays that Ce 3d3/2 spin-ob which correspond to u lines include three characteristic peaks labeled as u and u‴ (917.0 eV).…”

Section: Samples or Sootmentioning

confidence: 99%

“…In summary, Ce-Zr solid solutions show good cat performance for soot combustion, and the Co/CZ (Co3O4/CZ) sample exhibits the best cat performance. [34][35][36][37][38][39][40][41]. The Ce 3d spectrum consists o series of spin-orbit lines u and v. Figure 5a displays that Ce 3d3/2 spin-obit components of c which correspond to u lines include three characteristic peaks labeled as u (901.7 eV), u" (908.9 and u‴ (917.0 eV).…”

Section: Samples or Sootmentioning

confidence: 99%

“…. The characteristic diffraction peaks of Co 3 O 4 can be observed at 36.852 • and 44.808 • (JCPDS No. .…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Zhang

Wang

et al. 2019

Catalysts

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Cerium-zirconium (Ce-Zr) solid solutions have been extensively used in a wide variety of catalytic processes due to their unique catalytic features in conjunction with lower cost compared to noble metal-based systems. A series of Ce-Zr-based catalysts was prepared by the sol-gel method. The structure and morphology of these catalysts were characterized by X-ray diffraction, thermogravimetric-differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. Furthermore, investigation on catalytic performance was carried out by constructing a test platform, and the result indicated that the catalysts apparently decreased the soot ignition temperature. These catalysts exhibited higher catalytic activity for soot oxidation under narrow contact conditions. The results revealed that some soot particles could react with adsorbed oxygen, and other part of diesel soot reacted with lattice oxygen. The activity of these catalysts was attributed to synergistic effect arising from the combination of K/Co/Zr and Ce-Zr solid solution, which led to the decrease in the ignition temperature to 294 • C (data from the test platform). The catalyst still keeps good stability and catalytic activity after the cycle oxidation experiment. A reaction pathway was proposed to explain catalytic combustion process of soot, i.e., combination of K/Co/Zr with Ce-Zr solid solution reduced the binding energy of Ce-Zr solid solution, which was conducive to provide more active sites to release the active oxygen (O 2 − ) or lattice oxygen (O 2− ).Catalysts 2019, 9, 646 2 of 18 the filter becomes necessary. Soot burns at 500-600 • C under air conditions, while the diesel exhaust temperature is only 200-400 • C. Therefore, igniting soot combustion under these conditions requires catalytic oxidation. The filter should be able to trap and burn soot particles when it collects them, so that the filter does not saturate. A large number of catalysts has been investigated for controlling the exhaust emissions of diesel engines, and the main objective of most of these studies is to improve the catalytic performance for soot combustion. Numerous articles reporting the use of CeO 2 as an effective catalyst for soot combustion are available [11,12], and a mechanism has been proposed to explain these catalytic processes. The Ce 4+ /Ce 3+ redox cycle confers the ability to absorb gaseous O 2 , thus forming active oxygen at the catalyst surface (O ads ), which can be transferred to the soot catalyst interface by superficial diffusion. For this reason, properties of the Ce 4+ /Ce 3+ couple and the capacity of CeO 2 to exchange oxygen with the gas phase make CeO 2 -based materials one of the most promising catalysts for soot combustion [13,14]. They are widely known to favor the oxidation of soot by increasing the catalyst/soot contact with the high mobility of alkali metals or alkaline-earth metals [15][16][17][18][19][20]. Fan et al. studied the effect of Ba loading on Cu-Ce catalysts, and it was sh...

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Section: Samples or Sootsupporting

confidence: 60%

Section: Samples or Sootmentioning

confidence: 99%

Section: Samples or Sootmentioning

confidence: 99%

“…. The characteristic diffraction peaks of Co 3 O 4 can be observed at 36.852 • and 44.808 • (JCPDS No. .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Zhang

Wang

et al. 2019

Catalysts

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“…It is reported in the literature that the binding energy of Cu 2+ is at 934–935 eV while the lower binding energy suggests the existence of Cu + and/or Cu 0 . Shake‐up peak in the range of 936–950 eV is also evidence of Cu 2+ . The Cu 2p 3/2 peak appears to have higher FWHM for the CuO‐CeO 2 ‐1 and CuO‐CeO 2 ‐2 samples and with a, relatively to the main peak, more intense shake‐up peak, indicating that more Cu 2+ species are on the surface of these two samples.…”

Section: Resultsmentioning

confidence: 99%

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

et al. 2018

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Copper oxide nanoparticles were dispersed onto the surface of ceria nanorods, while a post‐synthesis modification was applied to the reference sample using ammonia solutions. The modified catalysts were characterized with a variety of analytical techniques, providing useful information on the effect of the Cu:NH3 ratio, employed in the modification step, on the physicochemical properties. Re‐dispersion of the active copper species under extremely basic conditions promoted the reducibility and the oxygen mobility of the catalyst, thus resulting in a more active and selective catalyst for preferential CO oxidation.

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TiO₂/CeO₂ Frame with Enriched Oxygen Vacancies and Hetero‐Interfaces for Efficient Electrochemical N₂ Reduction

Yan

et al. 2023

ChemCatChem

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Electrochemical nitrogen reduction reaction (NRR) under ambient conditions offers an environmentally benign and sustainable alternative for NH3 synthesis. Exploring highly active and robust NRR electrocatalysts is one of the prerequisites for developing sustainable N2/NH3 cycle systems. In this work, a surface chemistry rich TiO2/CeO2 frame is developed for electrochemical NRR, which is composed of ultrathin TiO2 nanosheets supported with CeO2 nanoparticles. Its unique porous framework as well as formed plentiful oxygen vacancies (OVs) and hetero‐interfaces collectively facilitate the adsorption/activation of N2 and transfer of electrons and protons. The catalyst can attain a high NH3 yield rate of 8.8 μg h−1 mg−1cat. and a Faradaic efficiency of 6.8 % at −0.25 V versus reversible hydrogen electrode, comparable with other reported Ti‐based and OVs‐contained catalysts. Moreover, the TiO2/CeO2 can maintain high durability over repeated 20 cycles. Therefore, this work heralds a new paradigm of fabricating framework‐structured catalyst with enriched hetero‐interfaces and defects toward effective and sustainable NH3 synthesis.

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Enhanced catalytic performance for CO preferential oxidation over CuO catalysts supported on highly defective CeO2 nanocrystals

Cited by 64 publications

References 63 publications

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

TiO₂/CeO₂ Frame with Enriched Oxygen Vacancies and Hetero‐Interfaces for Efficient Electrochemical N₂ Reduction

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Enhanced catalytic performance for CO preferential oxidation over CuO catalysts supported on highly defective CeO2 nanocrystals

Cited by 64 publications

References 63 publications

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

Catalytic Combustion of Diesel Soot on Ce/Zr Series Catalysts Prepared by Sol-Gel Method

A Novel Post‐Synthesis Modification of CuO‐CeO2 Catalysts: Effect on Their Activity for Selective CO Oxidation

TiO2/CeO2 Frame with Enriched Oxygen Vacancies and Hetero‐Interfaces for Efficient Electrochemical N2 Reduction

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Product

Resources

About

A Novel Post‐Synthesis Modification of CuO‐CeO₂ Catalysts: Effect on Their Activity for Selective CO Oxidation

TiO₂/CeO₂ Frame with Enriched Oxygen Vacancies and Hetero‐Interfaces for Efficient Electrochemical N₂ Reduction