N2O formation in the selective catalytic reduction of NOx with NH3 at low temperature on CuO-supported monolithic catalysts

Suárez, Silvia; Martín, Juan A.; Yates, M.; Ávila, P.; Blanco, Jesús

doi:10.1016/j.jcat.2004.10.019

Cited by 73 publications

(48 citation statements)

References 23 publications

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“…There are no visible CuO diffraction peaks due to low CuO loading. When the CuO content increases to 4.8 wt%, the slight peaks at 2h of 35.5°and 38.7°are also detected, confirming the presence of the CuO phase [26]. The peaks characteristic of CuO are well defined on the 14.3%CuO/Al 2 O 3 sample (Fig.…”

Section: Xrd Analysismentioning

confidence: 55%

Direct amination of toluene to toluidine with hydroxylamine over CuO–V2O5/Al2O3 catalysts

Gao

Zhang

Wang

et al. 2011

Reac Kinet Mech Cat

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A series of CuO-V 2 O 5 /Al 2 O 3 catalysts were prepared and characterized by various techniques such as XRF, BET, XPS and XRD. These catalysts were used for liquid-phase amination of toluene to toluidines. It was found that adding copper species to V 2 O 5 /Al 2 O 3 catalyst showed a peculiar behavior, maintaining a high activity toward toluene amination. An optimum CuO content appeared at 1.6 wt% with a CuO/V 2 O 5 molar ratio of 0.25. More than 60% total yield of toluidines was obtained over 1.6%CuO-15%V 2 O 5 /Al 2 O 3 catalyst under optimized conditions. Catalyst characterizations revealed that the addition of copper improved the formation of V 5? species, thus enhancing the activity of the catalyst.

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Section: Xrd Analysismentioning

confidence: 55%

Direct amination of toluene to toluidine with hydroxylamine over CuO–V2O5/Al2O3 catalysts

Gao

Zhang

Wang

et al. 2011

Reac Kinet Mech Cat

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“…Copper oxide has been extensively studied as an important component of CuO superconductors because of being a p-type semiconductor. With regard to its commercial value and semiconductor properties, CuO has also been widely exploited as a powerful heterogenous catalyst [6][7][8][9][10][11][12][13][14][15], photocatalyst [16][17][18][19][20], magnetic storage medium, solar energy transformer and gas sensor [21,22]. Therefore, the synthesis of CuO-loaded mesoporous titanium dioxide nanocrystalline seems to be valuable for heterogenous photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

A credible role of copper oxide on structure of nanocrystalline mesoporous titanium dioxide

Rahimnejad

Setayesh

Gholami

2008

JICS

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Copper oxide-titania catalysts with nanocrystalline mesoporous structure were prepared by sol-gel technique using tetra isopropyl ortho titanate (TiPT) as the inorganic precursor and amino-2 ethanol as the swelling agent. Characterization was performed using X-ray diffraction (XRD), fourier transformed infrared spectra (FTIR), scanning electron microscopy (SEM), diffuse reflectance UV-Vis spectroscopy (DRS), and N 2 adsorption-desorption measurements. It was found that CuO (0.025-0.1 mol ratio) has some effect on the particle size, surface area, pore-volume, pore-diameter, crystallinity of the particles, and crystalline phase of TiO 2 nanocrystalline. The results indicated that 0.1 CuO-TiO 2 had higher surface area and total pore volume among all CuO-TiO 2 samples. The S BET value of 0.1 mol ratio CuO-load TiO 2 sample is approximately similar to that of Degussa P25 while its pore volume (0.1198 cm 3 g -1 ) is larger than Degussa P25 due to production of large number of pores. Therefore, the physical property of 0.1 CuO-TiO 2 catalyst is comparable with Degussa P25.At 823K, the 0.1 mol ratio CuO-load TiO 2 sample shows the phase transformation from anatase to rutile in the ratio of 1:1.1. The synthesized CuO-TiO 2 nanocrystalline will be able to show photocatalytic reaction under visible light.

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“…[35] result is wrong for the present conditions. On the other hand, it is generally accepted that, under low temperature selective catalytic reduction reaction conditions, N 2 O is formed via the decomposition of AN, as an intermediate formed on the catalyst when ammonia reacts with the surface nitrate groups [48][49][50]. Ref.…”

Section: Catalytic Mechanism Of the Thermal Decomposition Of An Catalmentioning

confidence: 99%

Thermal Decomposition CharacteristicS of Ammonium Nitrate(v) in the Presence of Mn2O3/Graphene Oxides

et al. 2017

Cent. Eur. J. Energ. Mater.

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Nano-composites (Mn2O3, Mn2O3/graphene oxides (GO)) were prepared by a new method. The nano-composites were characterized by XRD and HRTEM. The catalytic performance of the nano-composites on the thermal decomposition of ammonium nitrate(V) (AN) was investigated by TG-DSC and TG-MS. The reaction of AN with the nano-composites in the condensed phase was investigated by RSFTIR. The results of TG-DSC experiments indicated that the nano-composites significantly catalyze the thermal decomposition of AN, especial Mn2O3/GO. The exothermic reaction of AN with Mn2O3/GO commenced at about 185 °C. Based on the TG-MS results, it was ascribed to N2O formation. In the RSFTIR experiments, the dissociation reaction and ionization reaction of AN were both detected. NOx formation at low temperature was also found. NH2 was directly oxidized by HNO3/NO3− at low temperature. The interaction between Mn2O3 and NH3 was detected according to DRIFT experiments. At elevated temperature, the functional groups of GO are destroyed, which had an influence on the interaction between Mn2O3 and GO. A probable mechanism for the exothermic reaction and then its disappearance is proposed. HNO3 gas was absorbed on the surface of solid AN, which can markedly catalyze the thermal decomposition of AN. Perhaps the HNO3 plays a key role in the exothermic reaction and then the reaction of AN disappears at very low temperatures.

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N2O formation in the selective catalytic reduction of NOx with NH3 at low temperature on CuO-supported monolithic catalysts

Cited by 73 publications

References 23 publications

Direct amination of toluene to toluidine with hydroxylamine over CuO–V2O5/Al2O3 catalysts

Direct amination of toluene to toluidine with hydroxylamine over CuO–V2O5/Al2O3 catalysts

A credible role of copper oxide on structure of nanocrystalline mesoporous titanium dioxide

Thermal Decomposition CharacteristicS of Ammonium Nitrate(v) in the Presence of Mn2O3/Graphene Oxides

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