Selective oxidation of ammonia to nitrogen over SiO2-supported MoO3 catalysts

Boer, Michiel de; Huisman, Henk; Mos, R.; Leliveld, R.G.; Dillen, A.J. van; Geus, J.W.

doi:10.1016/0920-5861(93)80023-t

Cited by 71 publications

(50 citation statements)

References 29 publications

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“…30,36,88,96,120,130,146,181] and (iii) the internal selective catalytic reduction (i-SCR) mechanism [e.g. 32,37,38,89,96,105,109,111,138,144,179,191]. A detailed description of these mechanisms was given by Jabłońska et al [e.g.…”

Section: The Mechanisms Of Nh3-scomentioning

confidence: 99%

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Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Jabłońska

Palkovits

2016

Applied Catalysis B: Environmental

186

172

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Section: The Mechanisms Of Nh3-scomentioning

confidence: 99%

“…[28][29][30][31][32]. The application areas for NH3-SCO include for instance the treatment of waste gases from chemical production processes, ammonia slip from the NH3-SCR process and gasification of biomass [e.g.…”

Section: Introductionmentioning

confidence: 99%

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Jabłońska

Palkovits

2016

Applied Catalysis B: Environmental

186

172

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“…The N 2 /NO 2 was added to the stream when the ammonia concentration was just below 0.2 mol-%. The conversion (Conv) of ammonia was calculated in the ordinary way as: Ef= |df(x,y)/dx|*Ex +|df(x,y)/dy|*Ey (12) In our case, E f is the error of margin of the conversion, |df(x,y)/dx| the partial differential of the conversion with respect to x (inlet molar ratio, if y is outlet molar ratio) and E x the margin of error in parameter x.…”

Section: Nox Reduction In the Model Synthesis Gasmentioning

confidence: 99%

“…In some of them [9,10] the concentration of CO and H 2 is very low, compared to a real synthesis gas produced in a gasifier. In others [11][12][13][14][15], it is not clear if the process studied really is SCO or ammonia cracking driven by the temperature increase, caused by CO and H 2 combustion in the catalytic bed due to the oxygen injection.…”

Section: Introductionmentioning

confidence: 99%

Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas

Tunå

Brandin

2013

Fuel

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PostprintThis is the accepted version of a paper published in Fuel. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Tuna, P., Brandin, J. (2013) Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas. Fuel AbstractSynthesis gas generated by the gasification of nitrogen-containing hydrocarbons will contain ammonia. This is a catalyst poison and elevated levels of nitrogen oxides (NO X ) will be produced if the synthesis gas is combusted. This paper presents a study of the selective oxidation of ammonia in reducing environments. The concept is the same as in traditional selective catalytic reduction, where NO X are removed from flue gas by reaction with injected ammonia over a catalyst. Here, a new concept for the removal of ammonia is demonstrated by reaction with injected NO X over a catalyst. The experiments were carried out in a model synthesis gas consisting of CO, CO 2 , H 2 , N 2 and NH 3 /NO X . The performance of two catalysts, V 2 O 5 /WO 3 /TiO 2 and H-mordenite, were evaluated. On-site generation of NO X by nitric acid decomposition was also investigated and tested. The results show good conversion of ammonia under the conditions studied for both catalysts, and with on-site generated NO X .

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“…Various kinds of catalysts that oxidize gaseous NH 3 have been examined. For example, de Boer et al (1993) studied the selective conversion of NH 3 to N 2 over V 2 O 5 , MoO 3 , and WO 3 catalysts on various supports at 525 K in the SCO reaction. Amblard et al (2000) performed excellent selective conversion of NH 3 to gaseous nitrogen using a γ-Al 2 O 3 -supported Ni catalyst in an SCO process.…”

Section: Introductionmentioning

confidence: 99%

Removal of Gaseous Ammonia in Pt-Rh Binary Catalytic Oxidation

Dong

Lai

Lin

2012

Aerosol Air Qual. Res.

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In this study, the oxidation of ammonia (NH 3 ) to form nitrogen was investigated by selective catalytic oxidation (SCO) over a Pt-Rh binary catalyst fabricated by the incipient wetness impregnation process in a tubular fixed-bed flow quartz reactor (TFBR). The catalysts were analysed by three-dimensional excitation-emission fluorescent matrix (EEFM) spectroscopy, UV-Vis absorption, dynamic light-scattering (DLS), zeta potential measurements, and linear sweep voltammograms (LSV). At optimum conditions, namely, a temperature of 673 K and an oxygen content of 4%, nearly 100% of the NH 3 was removed by catalytic oxidation over the Pt-Rh binary catalyst. The main product of the NH 3 -SCO process was N 2 . Additionally, for the freshly prepared Pt-Rh binary catalyst, three peaks (at 235/295 nm, 245/315 nm, and 240/365 nm) were observed via EEFM; however, the peak with the highest emission wavelength disappeared over time as Pt-Rh binary catalyst was exhausted by NH 3 . These results show that EEFM spectroscopy, which enhances intrinsic emission Pt clusters in the Pt-Rh binary catalyst, is an effective method for characterizing this catalyst in catalytic treatment systems. The UV-Vis absorption spectra revealed that the bands associated with such octahedral platinum (IV) species were observed at about 350 nm. Moreover, the LSV reversible redox ability may explain the significant activity of the catalysts.

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Selective oxidation of ammonia to nitrogen over SiO2-supported MoO3 catalysts

Cited by 71 publications

References 29 publications

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Copper based catalysts for the selective ammonia oxidation into nitrogen and water vapour—Recent trends and open challenges

Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas

Removal of Gaseous Ammonia in Pt-Rh Binary Catalytic Oxidation

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