The enhanced performance of ceria with surface sulfation for selective catalytic reduction of NO by NH3

Gu, Tingting; Liu, Yue; Weng, Xiaole; Wang, Haiqiang; Wu, Zhongbiao

doi:10.1016/j.catcom.2010.10.003

Cited by 307 publications

(135 citation statements)

References 41 publications

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“…The high extent of Cu + in 5%-Cu/CeO2-R contributed to the formation of Cu + associate clusters on the (110) surface, which was also observed in the UV-Vis results. As shown in Figure 4c, all of the catalysts exhibited a primary band Oʹ at 529.2-530.1 eV, which was attributed to the lattice oxygen bonding to the metal cations, and a shoulder band Oʹʹ at ~531.0 eV, which was assigned to the chemisorbed oxygen and/or the oxygen species in the surface hydroxyl groups [25]. The surface chemisorbed oxygen was the most active oxygen species in the oxidation reaction due to its high mobility.…”

Section: Chemical States Of the Catalystsmentioning

confidence: 94%

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Ren

Peng

et al. 2017

Catalysts

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CeO 2 nanooctahedrons, nanorods, and nanocubes were prepared by the hydrothermal method and were then used as supports of Cu-based catalysts for the water-gas shift (WGS) reaction. The chemical and physical properties of these catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 adsorption/desorption, UV-Vis spectroscopy, X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H 2 -TPR) and in situ diffuse reflectance infra-red fourier transform spectroscopy (DRIFTS) techniques. Characterization results indicate that the morphology of the CeO 2 supports, originating from the selective exposure of different crystal planes, has a distinct impact on the dispersion of Cu and the catalytic properties. The nanooctahedron CeO 2 catalyst (Cu-CeO 2 -O) showed the best dispersion of Cu, the largest amount of moderate copper oxide, and the strongest Cu-support interaction. Consequently, the Cu-CeO 2 -O catalyst exhibited the highest CO conversion at the temperature range of 150-250 • C when compared with the nanocube and nanorod Cu-CeO 2 catalysts. The optimized Cu content of the Cu-CeO 2 -O catalysts is 10 wt % and the CO conversion reaches 91.3% at 300 • C. A distinctive profile assigned to the evolution of different types of carbonate species was observed in the 1000-1800 cm −1 region of the in situ DRIFTS spectra and a particular type of carbonate species was identified as a potential key reaction intermediate at low temperature.

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Section: Chemical States Of the Catalystsmentioning

confidence: 94%

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Ren

Peng

et al. 2017

Catalysts

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“…This result provides a new route for synthesis of NH 3 -SCR catalysts with higher poisoning resistance for practical use. Recently, the surface modification of CeO 2 by WO x 91 or sulfate species 92 and the surface modification of CeO 2 -ZrO 2 solid solutions by nickel/sulfate species 93 or phosphate species 94 to promote the NH 3 -SCR activity also achieved some progress, in which the roles of acid sites induced by surface modifiers and the inhibition of NH 3 unselective oxidation at high temperatures were carefully addressed. In future studies, the surface modification of CeO 2 or other metal oxides could be a promising way to prepare applicable catalysts that is also convenient for studying their structure-activity relationship in the NH 3 -SCR reaction.…”

Section: Introductionmentioning

confidence: 99%

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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Selective catalytic reduction of NO x using NH 3 or hydrocarbons (NH 3 -SCR or HC-SCR) in oxygen-rich exhaust from diesel engines remains a major challenge in environmental catalysis. The development of highly efficient, stable and environmentally-benign catalysts for SCR processes is very important for practical use. In this feature article, the structure-activity relationship of vanadium-free catalysts in the NH 3 -SCR reaction is discussed in detail, including Fe-, Ce-based oxide catalysts and Fe-, Cu-based zeolite catalysts, which is beneficial for catalyst redesign and activity improvement. Based on our research, a comprehensive mechanism contributing to the performance of Ag/Al 2 O 3 in HC-SCR is provided, giving a clue to the design of a catalytic system with high efficiency.

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“…For example, the addition of cerium enhances the NH 3 -SCR activity and stability of Fe-ZSM-5 [7], V 2 O 5 -WO 3 /TiO 2 [21], and MnO x /TiO 2 [22]. In addition, some CeO 2 -based catalysts, such as CeO 2 -zeolite [23] and sulfated CeO 2 [24], are very active for NH 3 -SCR reaction. In our previous study, we successfully developed a highly effective Ce/TiO 2 catalyst prepared by impregnation method for NH 3 -SCR reaction [25].…”

Section: Introductionmentioning

confidence: 99%

An environmentally-benign CeO2-TiO2 catalyst for the selective catalytic reduction of NO with NH3 in simulated diesel exhaust

et al. 2012

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a b s t r a c tA Ce-Ti based (CeO 2 -TiO 2 ) catalyst prepared by an optimized homogeneous precipitation method showed excellent NH 3 -SCR activity, high N 2 selectivity, broad operation temperature window, and high resistance to space velocity (even under a high gas hourly space velocity (GHSV) of 500,000 h −1 ). Compared with V 2 O 5 -WO 3 /TiO 2 and Fe-ZSM-5 catalysts, the CeO 2 -TiO 2 catalyst showed better catalytic performance for NH 3 -SCR. Under a more realistic condition of simulated diesel engine exhaust, the monolith catalyst of CeO 2 -TiO 2 showed over 90% NO x conversion from 250 to 450• C under a GHSV of 20,000 h −1 in the presence of H 2 O, CO 2 , and C 3 H 6 . The high dispersion of active CeO 2 on TiO 2 in the process of homogenous precipitation and the synergistic effects between CeO 2 and TiO 2 in CeO 2 -TiO 2 are important reasons for the high NH 3 -SCR activity.

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The enhanced performance of ceria with surface sulfation for selective catalytic reduction of NO by NH3

Cited by 307 publications

References 41 publications

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

An environmentally-benign CeO2-TiO2 catalyst for the selective catalytic reduction of NO with NH3 in simulated diesel exhaust

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The enhanced performance of ceria with surface sulfation for selective catalytic reduction of NO by NH3

Cited by 307 publications

References 41 publications

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Morphology-Dependent Properties of Cu/CeO2 Catalysts for the Water-Gas Shift Reaction

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

An environmentally-benign CeO2-TiO2 catalyst for the selective catalytic reduction of NO with NH3 in simulated diesel exhaust

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Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects