A comprehensive review of NOx and N2O mitigation from industrial streams

Alves, Luís; Holz, Laura I.V.; Fernandes, Celina; Ribeirinha, Paulo; Mendes, Diogo; Fagg, Duncan P.; Mendes, Adélio

doi:10.1016/j.rser.2021.111916

Cited by 52 publications

(17 citation statements)

References 144 publications

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“…One strategy to mitigate these competing reduction reactions is to select electrocatalysts that meet the CO 2 reduction activity and selectivity requirements but have poor activity towards reducing the impurity. The choice of which catalyst to use would benefit from taking into consideration the abundant studies on electrocatalytic NO x , O 2 , and SO 2 reduction reactions [47–49] . The development of new catalysts that can efficiently reduce CO 2 in the presence of other reducible gases is possible, although the development process itself may be time‐consuming using the conventional trial‐and‐error approach.…”

Section: Mitigation Strategiesmentioning

confidence: 99%

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Harmon

Wang

2022

Angew Chem Int Ed

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The electrochemical conversion of waste CO 2 into useful fuels and chemical products is a promising approach to reduce CO 2 emissions; however, several challenges still remain to be addressed. Thus far, most CO 2 reduction studies use pure CO 2 as the gas reactant, but CO 2 emissions typically contain a number of gas impurities, such as nitrogen oxides, oxygen gas, and sulfur oxides. Gas impurities in CO 2 can pose a significant obstacle for efficient CO 2 electrolysis because they can influence the reaction and catalyst. This Minireview highlights early examples of CO 2 reduction studies using mixed-gas feeds, explores strategies to sustain CO 2 reduction in the presence of gas impurities, and discusses their implications for future progress in this emerging field.

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Section: Mitigation Strategiesmentioning

confidence: 99%

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Harmon

Wang

2022

Angew Chem Int Ed

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“…The choice of which catalyst to use would benefit from taking into consideration the abundant studies on electrocatalytic NO x , O 2 , and SO 2 reduction reactions. [47][48][49] The development of new catalysts that can efficiently reduce CO 2 in the presence of other reducible gases is possible, although the development process itself may be time-consuming using the conventional trial-anderror approach. To design catalysts that custom-fit CO 2 gas feed and conversion requirements, general structure descriptors for electrocatalytic reactions must be derived.…”

Section: Catalyst Selection and Development Strategiesmentioning

confidence: 99%

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Harmon

Wang

2022

Angewandte Chemie

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The electrochemical conversion of waste CO2 into useful fuels and chemical products is a promising approach to reduce CO2 emissions; however, several challenges still remain to be addressed. Thus far, most CO2 reduction studies use pure CO2 as the gas reactant, but CO2 emissions typically contain a number of gas impurities, such as nitrogen oxides, oxygen gas, and sulfur oxides. Gas impurities in CO2 can pose a significant obstacle for efficient CO2 electrolysis because they can influence the reaction and catalyst. This Minireview highlights early examples of CO2 reduction studies using mixed‐gas feeds, explores strategies to sustain CO2 reduction in the presence of gas impurities, and discusses their implications for future progress in this emerging field.

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“…The most effective and widespread technology to mitigate the N 2 O concentration is based on the selective catalytic reduction (SCR), 12 where this environmentally damaging gas is reduced by hydrocarbons, hydrogen, ammonia, or their combinations, usually in the presence of some oxygen 11 :

\begin{matrix} lefttrue \\ n {normalN}_{2} O + w {normalO}_{2} + [{normalC}_{x} {normalN}_{y} {normalH}_{z}] \to \frac{2 n + y}{2} {normalN}_{2} + \frac{z}{2} {normalH}_{2} O + x {normalCO}_{2} \\ + \frac{n + 2 w - (0.5 z + 2 x)}{2} {normalO}_{2} \end{matrix}

Nevertheless, the SCR shows some disadvantages such as the use of noble metal catalysts as well as the emission of pollutants (ie, CO 2 , which requires additional steps for its capture). Hence, the development of climate‐friendly strategies to mitigate the formation and emission of N 2 O, as well as for the improvement of currently used methods, are urgently required.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the development of climate‐friendly strategies to mitigate the formation and emission of N 2 O, as well as for the improvement of currently used methods, are urgently required. In particular, the electrochemical reduction of N 2 O is one of the most promising technologies, which has the potential to compete with state‐of‐the‐art mitigation technologies 11 …”

Section: Introductionmentioning

confidence: 99%

“…However, there are also other anthropogenic emissions, arising due to the burning of fossil fuels and industrial processes, such as nitric and adipic acid production. [8][9][10] Current European Union directives, therefore, aim for a reduction in the emissions of these gases by 42% by 2030, 11 with respect to 2013 emission values, in the face of rising restrictions imposed by the Gothenburg and Kyoto Protocols.…”

Section: Introductionmentioning

confidence: 99%

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The electrochemical promotion of nitrous oxide reduction on a lanthanum strontium iron cobalt cathode

Holz

Loureiro

Araújo

et al. 2022

Intl J of Energy Research

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Summary Nitrous oxide (N2O) is a potent greenhouse gas and suitable methods for its mitigation are urgently required. For this reason, we study the electrochemical promotion of N2O reduction on a La0.6Sr0.4Co0.2Fe0.8O3‐δ (LSCF) electrocatalyst. N2O decomposition was studied in the temperature range 600‐800°C, at ambient pressure, under applied polarization in galvanostatic mode. The results reveal the highest conversion increment factor of 13.12 at 600°C when a current of −0.25 A was applied. The Faradaic efficiency (|Λ|) was calculated for the tested experimental conditions and shows values that exceed unity, evidencing Non‐Faradaic Electrochemical Modification of Catalytic Activity (NEMCA) for the N2O reduction reaction. The nature of the mechanism was also assessed, showing a completely reversible effect, where the electrochemically promoted reaction rate returns to its open circuit (unpromoted) value upon removal of the applied polarization. The current work shows that the existence of the NEMCA effect can be a highly beneficial factor for the electrochemical treatment of this green‐house gas, with a valuable potential for mitigation of exhaust gases.

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A comprehensive review of NOx and N2O mitigation from industrial streams

Cited by 52 publications

References 144 publications

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

The electrochemical promotion of nitrous oxide reduction on a lanthanum strontium iron cobalt cathode

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A comprehensive review of NOx and N2O mitigation from industrial streams

Cited by 52 publications

References 144 publications

Electrochemical CO2 Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Electrochemical CO2 Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Electrochemical CO2 Reduction in the Presence of Impurities: Influences and Mitigation Strategies

The electrochemical promotion of nitrous oxide reduction on a lanthanum strontium iron cobalt cathode

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Product

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Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies

Electrochemical CO₂ Reduction in the Presence of Impurities: Influences and Mitigation Strategies