Formation of N2O greenhouse gas during SCR of NO with NH3 by supported vanadium oxide catalysts

Zhu, Minghui; Lai, Jun‐Kun; Wachs, Israel E.

doi:10.1016/j.apcatb.2017.11.029

Cited by 80 publications

(37 citation statements)

References 30 publications

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“…The catalytic activity was found to be comparable with that of FeTi material. N2O is an important greenhouse gas and it's the main by-product of NH3-SCR reaction [34]. The N2 selectivity of prepared materials is shown in Fig.…”

Section: Nox Conversion Over Catalystsmentioning

confidence: 99%

SO2 promoted in situ recovery of thermally deactivated Fe2(SO4)3/TiO2 NH3-SCR catalysts: From experimental work to theoretical study

Chen

et al. 2019

Chemical Engineering Journal

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Section: Nox Conversion Over Catalystsmentioning

confidence: 99%

SO2 promoted in situ recovery of thermally deactivated Fe2(SO4)3/TiO2 NH3-SCR catalysts: From experimental work to theoretical study

Chen

et al. 2019

Chemical Engineering Journal

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“…Therefore, the NSR technique is appropriate for the reduction of N x O y oxides produced by combustion engines. One should note here that additional N 2 O can be produced during the reduction of other N x O y oxides; consequently, it is necessary to avoid the side reactions leading to such species [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

N2O Hydrogenation on Silver Doped Gold Catalysts, a DFT Study

Fajín

Cordeiro

2022

Nanomaterials

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In this study, the full reaction mechanism for N2O hydrogenation on silver doped Au(210) surfaces was investigated in order to clarify the experimental observations. Density functional theory (DFT) calculations were used to state the most favorable reaction paths for individual steps involved in the N2O hydrogenation. From the DFT results, the activation energy barriers, rate constants and reaction energies for the individual steps were determined, which made it possible to elucidate the most favorable reaction mechanism for the global catalytic process. It was found that the N2O dissociation occurs in surface regions where silver atoms are present, while hydrogen dissociation occurs in pure gold regions of the catalyst or in regions with a low silver content. Likewise, N2O dissociation is the rate determining step of the global process, while water formation from O adatoms double hydrogenation and N2 and H2O desorptions are reaction steps limited by low activation energy barriers, and therefore, the latter are easily carried out. Moreover, water formation occurs in the edges between the regions where hydrogen and N2O are dissociated. Interestingly, a good dispersion of the silver atoms in the surface is necessary to avoid catalyst poison by O adatoms accumulation, which are strongly adsorbed on the surface.

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“…Around 40% of ammonia emission in the animal sector can be traced back to cattle and cows [2]. As ammonia converts into various nitrous oxides in the atmosphere, its contribution to global warming is roughly 265 times more severe compared to CO 2 [3]. The European Union identified the threat and harmfulness of ammonia emissions on the ozone layer [4], water eutrophication [5], overfertilizing or soil acidification [6], and odor nuisance in 2016 and decided that NH 3 emission must be cut by 12% until 2030 compared to 2005 [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Flushing Milk and Acidic Whey on pH and Nitrogen Loss of Cattle Manure Slurry

Sepperer

Petutschnigg

Steiner³

2021

Atmosphere

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With the increasing demand for food worldwide, the use of fertilizers in the agricultural industry has grown. Natural fertilizers derived from the use of animal manure slurry, especially cattle and cow, are responsible for 40% of the agricultural ammonia emission. The EU defined the goal to reduce NH3 emission drastically until 2030, yet until today an overall increase has been observed, making it more difficult to reach the target. In this study, we used two by-products from the dairy industry, namely flushing milk and acidic whey, to lower the pH of cattle manure slurry and therefore mitigate the loss of nitrogen in the form of ammonia into the atmosphere, making it available in the soil. Measurements of pH, ammonium nitrogen, total Kjeldahl nitrogen, and lactic acid bacteria colonies were conducted in a lab-scale experiment to test the hypothesis. Afterwards, pH measurements were conducted on bigger samples. We found that whey effectively reduced the pH of manure below 5, therefore moving the ammonia/ammonium equilibrium strongly towards ammonium. Flushing milk on the other hand lowered the pH to a smaller extent, yet allowed for faster hydrolysis of urea into ammonium. The findings in this study present a suitable and environmentally friendly approach to help reach the climate goals set by the EU by using by-products from the same industry branch, therefore being a suitable example of circular economy.

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Formation of N2O greenhouse gas during SCR of NO with NH3 by supported vanadium oxide catalysts

Cited by 80 publications

References 30 publications

SO2 promoted in situ recovery of thermally deactivated Fe2(SO4)3/TiO2 NH3-SCR catalysts: From experimental work to theoretical study

SO2 promoted in situ recovery of thermally deactivated Fe2(SO4)3/TiO2 NH3-SCR catalysts: From experimental work to theoretical study

N2O Hydrogenation on Silver Doped Gold Catalysts, a DFT Study

Effect of Flushing Milk and Acidic Whey on pH and Nitrogen Loss of Cattle Manure Slurry

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