Mechanism of the Selective Catalytic Reduction of NO by NH3over MnOx/Al2O3

Kijlstra, W.S.; Brands, D. S.; Poels, E.K.; Bliek, A.

doi:10.1006/jcat.1997.1788

Cited by 382 publications

(234 citation statements)

References 44 publications

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“…This is in agreement with Miyadera's result [10]. Several vibrational spectroscopy studies of NO + O 2 reaction on aluminabased material have been reported that different nitrates were formed on Al 2 O 3 [9,10,12,16,18]. However, the detailed assignments were inconsistent in the previous studies, especially for the band observed around 1300 cm −1 .…”

Section: Theoreticalsupporting

confidence: 90%

“…The strong band at 1304 cm −1 in Fig. 1, was assigned to as (ONO) of nitrates in previous study [18], whereas, no adsorption feature in Fig. 4b could be related with the strong band at 1304 cm −1 .…”

Section: Theoretical Spectra For the Adsorbed Nitrate Species On Almentioning

confidence: 70%

“…In addition, the vibration mode in the simulated spectrum in Fig. 4c was attributed to the N O stretch vibration, rather than the as (ONO) vibration [18]. On the basis of the above results, the calculated model c provided an actual structure to understand and clarify the assignment of the band at around 1300 cm −1 .…”

Section: Theoretical Spectra For the Adsorbed Nitrate Species On Almentioning

confidence: 73%

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Experimental and theoretical studies of surface nitrate species on Ag/Al2O3 using DRIFTS and DFT

Zhang

Gao

et al. 2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Section: Theoreticalsupporting

confidence: 90%

Section: Theoretical Spectra For the Adsorbed Nitrate Species On Almentioning

confidence: 70%

Section: Theoretical Spectra For the Adsorbed Nitrate Species On Almentioning

confidence: 73%

See 1 more Smart Citation

Experimental and theoretical studies of surface nitrate species on Ag/Al2O3 using DRIFTS and DFT

Zhang

Gao

et al. 2008

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…4, after the sample was treated with NH 3 at room temperature, the bands were observed at 1695, 1614, 1483, 1389, and 1232 cm À1 . The bands at 1695 and 1483 cm À1 were due to the asymmetric and symmetric deformation modes of NH 3 coordinated on Brønsted acid sites (NH þ 4 ) [6,[20][21][22][23], respectively. The band at 1389 cm À1 was observed under similar conditions on Ni/ Al 2 O 3 by Amblard et al [6] and on Au/MO x /c-Al 2 O 3 by Lin et al [24].…”

Section: Ftir Study Of Nh 3 Adsorptionmentioning

confidence: 99%

“…According to the literature [6,24] and the peak behavior when the sample was heated, the band at 1389 cm À1 could be assigned to NH þ 4 ad-species on the c-Al 2 O 3 support. The bands at 1614 and 1232 cm À1 could be assigned to the asymmetric and symmetric deformation modes of NH 3 coordinated on Lewis acid sites [6,[20][21][22][23], respectively. Correspondingly, the bands in the NH stretching region were also observed at 3401, 3356, 3270, and 3149 cm À1 [8,14,25].…”

Section: Ftir Study Of Nh 3 Adsorptionmentioning

confidence: 99%

Mechanism of selective catalytic oxidation of ammonia to nitrogen over Ag/Al2O3

Zhang

2009

Journal of Catalysis

200

127

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Mechanism O 2 uptake In situ DRIFTS a b s t r a c tThe mechanism of selective catalytic oxidation (SCO) of NH 3 over Ag/Al 2 O 3 was studied by NH 3 temperature-programed oxidation, O 2 -pulse adsorption, and in situ DRIFTS of NH 3 adsorption and oxidation. The essence which affects the low temperature activity of Ag/Al 2 O 3 has been elucidated through the mechanism study. Different Ag species on Ag/Al 2 O 3 significantly influence O 2 uptake by catalysts; while different oxygen species affect the activity of NH 3 oxidation at low temperature. The activated -NH could react with the atomic oxygen (O) at low temperatures (<140°C); however, the -NH could also interact with the O 2 at temperatures above 140°C. At low temperatures (<140°C), NH 3 oxidation follows the -NH mechanism. However, at temperatures above 140°C, NH 3 oxidation follows an in situ selective catalytic reduction (iSCR) mechanism (two-step formation of N 2 via the reduction of an in situ-produced NO x species by a NH x species).

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Design Strategies for a Denitrification Catalyst with Improved Resistance against Alkali Poisoning: The Significance of Nanoconfining Spaces and Acid–Base Balance

Wang

Chen

et al. 2016

ChemCatChem

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Based on the ideas of the nanoconfining effect and the acid–base balance mechanism, a dual‐protection strategy was designed to solve the deactivation problem that occurs on ceria‐based deNOx catalysts. The nanoconfining spaces were provided by multilayer titanate nanotubes, and the acid–base balance was guaranteed by the modification of sulfuric acid pickling on titanate nanotubes. The ceria‐doped 0.1 mol L−1 sulfated titanate nanotubes catalyst exhibited an excellent selective catalytic reduction (SCR) catalytic activity and enhanced alkali resistance. It was found that the enhanced alkali resistance was relevant for the perfect hollow‐tubular structure, repeatable Ce4+/Ce3+ redox cycles, and increased surface acid sites. In situ diffuse reflectance infrared Fourier transform spectroscopy further identified that the balance of acidity and basicity on K‐Ce/0.1STNTs ensured the activity of adsorbed NH3 and NOx species. The SCR reaction was thus facilitated over the sulfated catalysts and both the Eley–Rideal and Langmuir–Hinshelwood mechanisms may occur during the reaction.

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Mechanism of the Selective Catalytic Reduction of NO by NH3over MnOx/Al2O3

Cited by 382 publications

References 44 publications

Experimental and theoretical studies of surface nitrate species on Ag/Al2O3 using DRIFTS and DFT

Experimental and theoretical studies of surface nitrate species on Ag/Al2O3 using DRIFTS and DFT

Mechanism of selective catalytic oxidation of ammonia to nitrogen over Ag/Al2O3

Design Strategies for a Denitrification Catalyst with Improved Resistance against Alkali Poisoning: The Significance of Nanoconfining Spaces and Acid–Base Balance

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