Investigation of the structure, acidity, and catalytic performance of CuO/Ti0.95Ce0.05O2 catalyst for the selective catalytic reduction of NO by NH3 at low temperature

Yao, Xin‐Kan; Zhang, Lei; Li, Lulu; Liu, Lichen; Cao, Yuan; Dong, Xian; Gao, Fei; Deng, Yu; Tang, Changjin; Chen, Zhuo; Chen, Yi

doi:10.1016/j.apcatb.2013.12.007

Cited by 239 publications

(91 citation statements)

References 49 publications

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“…6a shows the O 1s spectra of mesoporous NiO-CeO 2 catalysts. In addition to the presence of the main peak O' at 529.3 eV attributed to the lattice oxygen of the metal oxides, an apparent shoulder peak O" at 531.9 eV representing the absorbed oxygen and oxygen in carbonates, hydroxyl groups is observed [37]. The relative percentage of these two kinds of oxygen species (i.e., lattice oxygen and chemisorbed oxygen) is quantified based on the area of O and O , and the ratio of S O /S O for these samples follows the order: meso-CeO 2 < meso-Ni 0.05 Ce < meso-Ni 0.1 Ce < meso-Ni 0.2 Ce, which is in accordance with the order of the oxygen vacancy concentration and Raman signal at 831 cm −1 .…”

Section: Tablementioning

confidence: 93%

“…6b. According to the literatures, the bands labeled u and represent 3d 10 4f 1 initial electronic state corresponding to Ce 3+ , while the other six bands labeled u and , u and , u 0 and 0 are related to Ce 4+ [37][38][39]. Moreover, from the area of these peaks, the contents of Ce 3+ relative to the total Ce concentration of these samples are calculated by the following equation:…”

Section: Tablementioning

confidence: 99%

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Mesoporous NiO–CeO2 catalysts for CO oxidation: Nickel content effect and mechanism aspect

Tang

Yao

et al. 2015

Applied Catalysis A: General

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108

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Section: Tablementioning

confidence: 93%

Section: Tablementioning

confidence: 99%

Mesoporous NiO–CeO2 catalysts for CO oxidation: Nickel content effect and mechanism aspect

Tang

Yao

et al. 2015

Applied Catalysis A: General

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108

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“…[36,37] In addition, a slight shift of the cerium characteristic peak (Figure S3) could be observed for the Ce 10 /Ti, Ce 10 W 6 /Ti, and Sb 5 Ce 10 W 6 /Ti, which implies that tungsten and antimony incorporated into the cerium crystal with the crystal maintaining the cubic cerium structure. Both Raman spectra and high-resolution (HR) TEM proved that doping of antimony prohibited the cerium crystal size, reducing the lattice spacing ( Figures S4 and S5).…”

mentioning

confidence: 92%

Investigations on the Antimony Promotional Effect on CeO₂–WO₃/TiO₂ for Selective Catalytic Reduction of NO_x with NH₃

Liang

Liu

et al. 2016

ChemCatChem

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Antimony‐doped CeO2–WO3/TiO2 catalysts were prepared by a conventional ultrasonic‐assisted impregnation method and employed for selective catalytic reduction of NOx with NH3 at low temperature. Both experimental work and theoretical studies were employed to elucidate the effect of the antimony on promoting the CeO2–WO3/TiO2 catalyst. The catalytic activity of CeO2–WO3/TiO2 was largely improved after the addition of antimony oxide. It was found that antimony doping reduced the crystal size and strengthened the synergistic effect between the metal cations, which resulted in a favorable catalyst surface status with abundant active surface oxygen, Brønsted acid sites, and effective electron transfer. Both in situ diffuse reflectance infrared Fourier transform analysis and DFT calculation results revealed that the ammonia and NOx desorption behavior over the catalyst surface were considerably different. For the ammonia species, rather large amounts of the active NH4+ and NH3 species anchored on the surface of the Sb‐doped CeO2–WO3/TiO2. In view of the NOx species, the amount of nonactive bidentate nitrate species was largely reduced and the amount of active gaseous NO2 species was clearly enhanced, which lowered the activation energy of the catalytic process and gave rise to the elevated low‐temperature NH3 selective catalytic reduction activity. All these preferable properties resulted in the elevated de‐NOx activity of the Sb‐doped CeO2–WO3/TiO2 catalyst.

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“…The bands at 1211 and 1391 cm −1 can be assigned to N-H bonds in NH 3 that is chemisorbed on Lewis acid sites [18]. As illustrated in Figure 2B, DRIFT spectra for NH 3 adsorption over Cat-B were similar to those for NH 3 adsorption over Cat-A.…”

Section: Catalytic Activitymentioning

confidence: 51%

DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction

Zhang

et al. 2018

Catalysts

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Abstract:Heteropoly acids (HPAs) with the Keggin structure have been widely used in NO x removal. Two kinds of catalysts (those with and without the Keggin structure) are prepared for studying the effect of the Keggin structure on the NH 3 -SCR reaction. A series of in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) analyses are conducted to investigate the surface-adsorbed species on the catalysts during the SCR reaction. The mechanism for enhancing low-temperature activity of the catalysts is proposed. Furthermore, the effect of NH 4 + in the Keggin structure is also investigated. Results indicate that both the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms occurred in the NH 3 -SCR reaction over the catalyst with the Keggin structure (Cat-A); in addition, when more acid sites are provided, NO x species activity is improved and more NH 4 + ions participate in reaction over Cat-A, thus promoting SCR activity.

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Investigation of the structure, acidity, and catalytic performance of CuO/Ti0.95Ce0.05O2 catalyst for the selective catalytic reduction of NO by NH3 at low temperature

Cited by 239 publications

References 49 publications

Mesoporous NiO–CeO2 catalysts for CO oxidation: Nickel content effect and mechanism aspect

Mesoporous NiO–CeO2 catalysts for CO oxidation: Nickel content effect and mechanism aspect

Investigations on the Antimony Promotional Effect on CeO₂–WO₃/TiO₂ for Selective Catalytic Reduction of NO_x with NH₃

DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction

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Investigation of the structure, acidity, and catalytic performance of CuO/Ti0.95Ce0.05O2 catalyst for the selective catalytic reduction of NO by NH3 at low temperature

Cited by 239 publications

References 49 publications

Mesoporous NiO–CeO2 catalysts for CO oxidation: Nickel content effect and mechanism aspect

Mesoporous NiO–CeO2 catalysts for CO oxidation: Nickel content effect and mechanism aspect

Investigations on the Antimony Promotional Effect on CeO2–WO3/TiO2 for Selective Catalytic Reduction of NOx with NH3

DRIFT Study on Promotion Effect of the Keggin Structure over V2O5-MoO3/TiO2 Catalysts for Low Temperature NH3-SCR Reaction

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Investigations on the Antimony Promotional Effect on CeO₂–WO₃/TiO₂ for Selective Catalytic Reduction of NO_x with NH₃