Analysis of Non-Selective Catalyst Reduction Performance with Dedicated Exhaust Gas Recirculation

Roekel, Chris A Van; Montgomery, David T.; Singh, Jaswinder; Olsen, Daniel B.

doi:10.4236/aces.2022.122009

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…1Pd-1Cu/SBA-15 reduced at 200˚C shows a very high nitrate conversion (96%) compared to 1Pd-1Cu/SBA-15 reduced at 100˚C (13%). This result can be explained by the fact that changing the reduction temperature can modify the metal-metal and metal-support interactions that affect the catalytic behavior in nitrate reduction experiments [48]- [52], and according to the TPR results already done, it can be noticed that the reduction range of Pd-Cu metals is closer to 200˚C where CuO formation in the presence of an oxygenated surface requires a higher temperature to be reduced, as previously demonstrated for Pd-Cu and Pt-Cu supported catalysts [48].…”

Section: Effect Of the Reduction Methods And The Temperaturementioning

confidence: 99%

Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water

Rachini¹,

Jaafar²,

Tabaja³

et al. 2023

MSA

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Nitrate from the application of nitrogen-based fertilizers in intensive agriculture is a notorious waste product, though it lacks cost-effective solutions for its removal from potential drinking water resources. Catalytic reduction appears to be a promising technique for converting nitrates to benign nitrogen gas. Mesoporous silica SBA-15 is a frequently used catalyst support that has large surface areas and highly ordered nanopores. In this work, mesoporous silica SBA-15 bimetallic catalysts for nitrate reduction were investigated. The catalyst was optimized for the selection of promoter metal (Sn and Cu), noble metal (Pd and Pt) and loading ratios of these metals at different temperatures and reduction conditions. The catalysts prepared were characterized by FT-IR, N 2 physisorption, XRD, SEM, and ICP. All catalysts showed the presence of cylindrical mesoporous channels and uniform pore structures that remained even after metals loading. In the presence of a CO 2 buffer, the catalysts 4Pd-1Cu/SBA-15 and 1Pt-1Cu/SBA-15 reduced at 100˚C under H 2 and 1Pd-1Cu/SBA-15 reduced at 200˚C under H 2 demonstrated very high nitrate How to cite this paper:

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Section: Effect Of the Reduction Methods And The Temperaturementioning

confidence: 99%

Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water

Rachini¹,

Jaafar²,

Tabaja³

et al. 2023

MSA

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“…How to reduce nitrogen oxide emissions as effectively as possible under the condition of complete combustion has become one of the focuses of research [2]. The current common denitrification technologies include liquid adsorption [3], dry gas adsorption [4], biological enzymatic degradation treatment [5], non-selective catalytic reduction (SNCR) [6], selective catalytic reduction (SCR) [7], and so on [8]. NH 3 -SCR and CO(NH 2 ) 2 -SCR are the typical SCR methods commonly used in industry, in which redox reaction is taken place between ammonia gases and nitrogen oxides [9].…”

Section: Introductionmentioning

confidence: 99%

Performance of Mn-Ce-Fe/FA Catalysts on Selective Catalytic Reduction of NOX with CO under Different Atmospheres

et al. 2023

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Gas turbines produce a large amount of NOx and CO due to high temperatures and insufficient combustion. Through the selective catalytic reduction of NO with CO (CO-SCR) in a gas turbine, the activities of the Mn-Fe-Ce/FA catalyst using fly ash (FA) as a carrier under different atmospheres were studied. The catalysts prepared by calcining different active materials under different atmospheres were used to analyze their denitrification abilities and resistance to water vapor. The denitrification performance of the catalyst prepared under reducing atmosphere is about 30 percent higher than that of the catalyst prepared under air atmosphere, and the decarburization performance is about 40 percent higher. In the presence of oxygen, the denitrification rate and decarburization rate of the 1:1 ratio of the Mn-Ce catalyst reach 67.16% and 59.57%, respectively. In an oxygen-containing atmosphere, the catalyst prepared by replacing Ce with Fe shows better denitrification and decarburization performances, which are 78.56% and 78.39%, respectively. When the flue gas space velocity is 4000 h−1 and the carbon-nitrogen ratio is 1.6, the catalyst shows better performance. After the water vapor is introduced, the denitrification and decarbonization rates of the catalyst decrease by about 10% and 9%, respectively. After ceasing water vapor, it rebounds by about 8%, and the activity could not be fully restored. However, the catalyst still shows strong water resistance in general.

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“…By implementing flue gas recirculation, a significant reduction in NO X emissions of more than 90% can be achieved through lower temperatures (estimated up to 25% reduction) and better mixing with the oxidizer; -In internal combustion engines (when burning natural gas). A special method of exhaust gas recirculation involves the recirculation of exhaust gases from one or more engine cylinders back into the engine intake manifold under any operating conditions [11]; -When burning biofuels: in [12], an experimental study on the implementation of primary measures to reduce emissions of harmful substances in flue gases was carried out on a prototype stand of a biofuel boiler with a capacity of 20 kW. Flue gas recirculation in the experiment was organized by mixing primary air with flue gases after the boiler.…”

Section: Introductionmentioning

confidence: 99%

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

Fedorov,

Generalov,

Sherkunov

et al. 2023

Energies

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Currently, NOX emission requirements for thermal power plants and power equipment are being tightened. Regime and technical measures are being developed to improve the efficiency of fuel combustion in boilers. Due to the high cost of field studies, and in some cases the impossibility of conducting them, mathematical modeling tools allow one to work out technical and tactical measures. In this paper, the multidisciplinary STAR-CCM+ platform with GMU-45 type burners is used to simulate the combustion of gaseous fuel in a digital model of an energy boiler of the type TGME-464. By conducting numerical experiments, the possibility of reducing NOX emissions by using flue gas recirculation is considered, and the efficiency of burner devices is compared when using different embrasure configurations.

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Analysis of Non-Selective Catalyst Reduction Performance with Dedicated Exhaust Gas Recirculation

Cited by 4 publications

References 10 publications

Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water

Activity and Selectivity of Bimetallic Catalysts Based on SBA-15 for Nitrate Reduction in Water

Performance of Mn-Ce-Fe/FA Catalysts on Selective Catalytic Reduction of NOX with CO under Different Atmospheres

Improving the Efficiency of Fuel Combustion with the Use of Various Designs of Embrasures

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