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Amblard, M.; Burch, Robbie; Southward, Barry W. L.

doi:10.1023/a:1019054613815

Cited by 31 publications

(30 citation statements)

References 9 publications

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“…The increasing problem of atmospheric pollution by various N-containing compounds, such as NO, N 2 O, NO 2 , and NH 3 , has resulted in stricter regulations on their emissions. Many chemical processes have ammonia as a reactant or produce ammonia as a by-product (e.g., nitric acid and nitrogen fertilizer production, urea manufacturing, hydrodenitrification process, DeNOx process).…”

Section: Introductionmentioning

confidence: 99%

“…Various transition metal oxides including CuO, Fe 2 O 3 , Co 3 O 4 , MnO 2 MoO 3 , V 2 O 5 (e.g., [1][2][3][4][5][6]) were tested as catalysts for the SCO process. Among them the catalysts containing copper and/or iron were found to be some of the most interesting systems.…”

Section: Introductionmentioning

confidence: 99%

“…Some of the Mg 2? cations are replaced by trivalent ones (e.g., Al 3? ) which result in an increase of the positive charge density of the layer. This net positive charge is compensated by anions (e.g., CO 3 2-, NO 3 -) which together with water molecules are located in the interlayer space. Furthermore, some of the Mg 2?…”

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: Introductionmentioning

confidence: 99%

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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“…The measurements were performed in a flow microreactor system equipped with QMS detector (VG Quartz). Prior to ammonia sorption, a sample was outgassed in a flow of pure helium at 450°C for 1 h. Subsequently, the microreactor was cooled down to 70°C and the sample was saturated in a flow of gas mixture containing 1 vol.% of NH 3 in helium for about 30 min. Then, the catalyst was purged in a helium flow until a constant baseline level was attained.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…The effectiveness of the DeNO x process can be improved by supplying stoichiometric or even excess quantity of ammonia to the NO x converter. The residual ammonia could be selectively oxidized to N 2 and H 2 O in a secondary bed of catalyst [3]. It should be noticed that majority of flue gases contains oxygen, therefore there is not need to supply this gas for the ammonia oxidation process.…”

Section: Introductionmentioning

confidence: 99%

Natural Micas Intercalated with Al2O3 and Modified with Transition Metals as Catalysts of the Selective Oxidation of Ammonia to Nitrogen

et al. 2009

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Natural cationic layered clays-vermiculite and phlogopite-pretreated with acids were intercalated with alumina pillars. In next step, transition metals were deposited on the surface of pillared interlayer clays (PILC) by a liquid ion exchange method. The catalyst samples were characterized with respect to: composition (EPMA), structure (XRD), texture (BET), surface acidity (NH 3 -TPD) and coordination of deposited transition metals (UV-vis-DRS). The modified clays were tested in the role of catalyst for the selective oxidation of ammonia to nitrogen. In a series of the studied samples the best catalytic performance presented alumina pillared vermiculite modified with copper.

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Preparation of Ag–Cu/Al₂O₃ Composite Catalyst for Ammonia Decomposition

Lee

Lim

Park³

et al. 2015

Bulletin Korean Chem Soc

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A catalyst of Ag with alumina has been widely used for the decomposition of odorous ammonia. In order to meet cost effectiveness, copper was added with five different doping ratios of Ag/Cu in this work, and NH 3 decomposition was examined at 150-400 C. Experimental results show that the catalyst doped with only Cu shows very weak potential to oxidize NH 3 despite its excellent selectivity for nitrogen molecules than NO or N 2 O at temperatures over 300 C. Analysis by X-ray photoelectron spectroscopy indicates that Ag 0 is the major chemical functionality that determines the decomposition rate of NH 3 at low temperature, e.g., 200 C, while Ag + and Ag 2+ are efficient at higher temperatures. Among the five segregated copper functionalities, only Cu 2p a/2 appeared to be favorable for the activity of Ag particles. It was found from the experimental results that Ag/Cu = 1:9 could provide a cost-effective combination for the low temperature regime.

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Cited by 31 publications

References 9 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

Natural Micas Intercalated with Al2O3 and Modified with Transition Metals as Catalysts of the Selective Oxidation of Ammonia to Nitrogen

Preparation of Ag–Cu/Al₂O₃ Composite Catalyst for Ammonia Decomposition

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Untitled

Cited by 31 publications

References 9 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

Natural Micas Intercalated with Al2O3 and Modified with Transition Metals as Catalysts of the Selective Oxidation of Ammonia to Nitrogen

Preparation of Ag–Cu/Al2O3 Composite Catalyst for Ammonia Decomposition

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Product

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Preparation of Ag–Cu/Al₂O₃ Composite Catalyst for Ammonia Decomposition