Selective Low Temperature NH3 Oxidation to N2 on Copper-Based Catalysts

Lü, Gang; Grondelle, van J Joop; Anderson, B.; Santen, van Ra Rutger

doi:10.1006/jcat.1999.2524

Cited by 129 publications

(92 citation statements)

References 20 publications

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“…4b). Comparing the obtained results with that reported in the scientific literature it could be concluded the studied catalyst is significantly less sensitive to the presence of water vapour than other active Cu-doped catalysts of the SCO process (e.g., Cu/TiO 2 [8], Cu/Al 2 O 3 , CuY [9,10]). …”

Section: Resultssupporting

confidence: 64%

“…Copper oxide deposited on alumina, titania, and zeolites exchanged with copper were found to be active and selective catalysts for the low-temperature SCO process, however, their catalytic performance was significantly decreased by the presence of water vapour in the reaction mixture [7][8][9][10]. Hung [11] has shown high activity of a CuO/La 2 O 3 oxide system obtained by the co-precipitation method, while Cui et al [6] reported high activity and selectivity to nitrogen of the mesoporous CuO/RuO 2 catalysts obtained by a co-nano casting-replication method.…”

Section: Introductionmentioning

confidence: 99%

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Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

et al. 2011

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Mg-Cu-Fe oxide systems, obtained from hydrotalcite-like precursors, were tested as catalysts for the selective catalytic oxidation (SCO) of ammonia. Copper containing catalysts were active in low-temperature SCO processes; however, their selectivity to nitrogen significantly decreased at higher temperatures. The optimum composition of the catalyst to guarantee high activity and selectivity to N 2 was proposed. Temperature-programmed experiments, SCO catalytic tests performed with various contact times and additional tests on the samples in the selective catalytic reduction of NO with ammonia showed that the SCO process over the studied calcined hydrotalcites proceeds according to the internal SCR mechanism and oxidation of ammonia to NO is a rate-determining step in the low-temperature range.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

et al. 2011

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“…The NH 3 conversion increased significantly with the increase of copper loading from 1 to 10%, and then remained almost unchanged with the further increase of copper loading from 10 to 20%. It is clear that activity of 10%Cu/TiO 2 for the NH 3 conversion was far higher than that of 10% Cu/Al 2 O 3 (100% ammonia conversion was achieved at about 350 • C), which was developed in the previous study [15]. The selectivity of NH 3 to N 2 , on the other hand, decreased with the increase of copper content.…”

Section: Ammonia Oxidation On Copper-based Catalystsmentioning

confidence: 57%

Selective catalytic oxidation of ammonia from MAP decomposition

Zhang

Yang

et al. 2007

Separation and Purification Technology

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The Cu/TiO 2 catalysts with different Cu loadings were prepared, and their performance in the selective catalytic oxidation of ammonia (SCO of NH 3 ) was compared with 10% Cu/Al 2 O 3 . The 10% Cu/TiO 2 has the best performance among its series for NH 3 conversion and N 2 selectivity. At 250• C, the 100% conversion of ammonia was achieved and the selectivity to N 2 came to 95%. The 10% Cu/TiO 2 catalyst has a much higher activity for the SCO of ammonia and a slightly lower N 2 selectivity than 10% Cu/Al 2 O 3 because of the higher oxygen mobility and lower oxygen bonding strength, which demonstrated that TiO 2 is a more suitable support than Al 2 O 3 for copper-based catalyst in the SCO of NH 3 . The mechanisms involved in the SCO of NH 3 reaction on the 10% Cu/TiO 2 catalyst have also been investigated using TPD, TPR as well as in situ DRIFTS methods.

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“…ions with g-value of 2.32 were not responsible for coke formation. Furthermore, the binuclear ion is known to be an active site for oxidation [25]. Therefore, we concluded that [Cu-O-Cu] 2?…”

Section: Characterization Of Cu Speciesmentioning

confidence: 91%

High Resistance of Cu–Ferrierite to Coke Formation During NH3-SCR in the Presence of n-Decane

et al. 2009

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Selective catalytic reduction of NO x by NH 3 over in the presence of n-decane and SO 2 was investigated. NO x conversion over Cu-ZSM-5 decreased in the presence of n-decane, owing to inhibition of the active sites by coke formation. In contrast, coke formation was negligible over Cu-FER, which maintained its NO x conversion activity even in the presence of decane. Coke formation was negligible over H-ZSM-5 and H-FER supports, which suggests that Cu species were involved in coke formation. Temperature-programmed reduction by H 2 and electron spin resonance spectroscopy indicated that [Cu-O-Cu] 2? was probably the Cu species involved in coke formation over Cu-ZSM-5.

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Selective Low Temperature NH3 Oxidation to N2 on Copper-Based Catalysts

Cited by 129 publications

References 20 publications

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Hydrotalcite Originated Mg–Cu–Fe Mixed Metal Oxides

Selective catalytic oxidation of ammonia from MAP decomposition

High Resistance of Cu–Ferrierite to Coke Formation During NH3-SCR in the Presence of n-Decane

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