NOx Storage and Reduction for Diesel Engine Exhaust Aftertreatment

Pereda‐Ayo, Beñat; González‐Velasco, Juan R.

doi:10.5772/55729

Cited by 17 publications

(14 citation statements)

References 91 publications

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“…In other words, the removal efficiency of NO x drastically decreases with increasing A/F ratio from 14.7, i.e., with increasing O 2 concentration. On the other hand, diesel engines and lean‐burn gasoline engines have an advantage in fuel economy compared to the gasoline engines, and the use of these engines lowers the fuel consumption by up to 30% 5. However, the diesel and lean‐burn engines are operated at a high A/F ratio of 25–60, where the three‐way catalyst cannot decompose the NO x efficiently.…”

Section: Introductionmentioning

confidence: 99%

Selective Catalytic Reduction of NO by NH₃ over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Yamamoto

Teramura

Tanaka

2016

The Chemical Record

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This account describes the work of our group in the selective catalytic reduction of nitrogen oxides (NO ) with ammonia over heterogeneous photocatalysts (photo-SCR) in the past 16 years. We have found that the photo-SCR proceeds over heterogeneous photocatalysts using a gas flow reactor, elucidated the reaction mechanism under UV- and visible-light irradiation by spectroscopic and kinetic studies, and developed a highly active photo-SCR system by improving the photocatalyst material itself and the reaction system with several approaches based on the reaction mechanism.

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Section: Introductionmentioning

confidence: 99%

Selective Catalytic Reduction of NO by NH₃ over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Yamamoto

Teramura

Tanaka

2016

The Chemical Record

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“…In Figure 1, the slurry viscosity almost holds constant at pH < 4.5, suggesting that the slurry viscosity is not sensitive to pH. In addition, Pereda-Ayo et al [29,30] revealed that at pH = 3.5-4, the alumina-based slurry presented an optimal state of uniformity and stabilization, and a high washcoat loading could be achieved. Nijhuis et al [22] reported that a pH of 3-4 could improve the slurry stabilization, while higher or lower pH increased the viscosity, resulting in unfavorable coating.…”

Section: Phmentioning

confidence: 89%

Optimization of the Washcoat Slurry for Hydrotalcite-Based LNT Catalyst

Zhu

Chen

et al. 2019

Catalysts

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This work aimed to optimize the washcoat slurry for hydrotalcite-based lean NOx trap (LNT) catalyst. The effects of the slurry properties including pH, solid content, binder and additive on the hydrotalcite-based slurry viscosity were investigated. The particle size distribution of the optimal hydrotalcite-based slurry was measured. A cordierite material was used to coat the optimal slurry, and the washcoat was characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption. The optimal slurry containing Pt and Ba was coated on the cordierite for the preparation of hydrotalcite-based LNT catalyst, and the performances of this catalyst were evaluated by NOx storage test, temperature programmed desorption and NOx reduction. For comparison, the performance of the commercial LNT catalyst with Pt/BaO/Al2O3 was analyzed. After coating, the hydrotalcite-based washcoat was closely contacted with the support, being the main phase MgO and presenting a specific surface area of 86.3 m2/g. The hydrotalcite-based LNT catalyst had better NOx storage and desorption ability, selectivity to N2 and LNT efficiency than the Pt/BaO/Al2O3 catalyst.

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“…Oko stehiometrijske tačke (A/F=14,63) sve tri zagaĎujuće materije imaju visok stepen konverzije (>95%). MeĎutim, kada je mešavina bogata kiseonikom, kao što je u dizel motorima (A/F>20), konverzija NO x je manja [4]. ZagaĎujuće materije ponašaju se pojedinačno na sledeći način:…”

Section: Slika 8 Pozicioniranje Lambda Sonde (Levo) I Njen Uzdužni Punclassified

“…Odnos vazduha prema gorivu (A/F) u smeši benzinskog motora [4] Tokom radnog veka katalizatora moţe doći do:  zatrovanja površine katalizatora kada je konvertor izloţen supstancama koje prekrivaju aktivnu površinu (npr. olovo -katalizatori rade samo sa bezolovnim gorivom, fosfor -više se ne koristi u aditivima za motorno ulje, silikon iz zaptivača, sumpor i ugljenik iz goriva),  topljenja katalizatora kada velike količine nesagorelih HC doĎu u kontakt sa monolitom povećavajući radnu temperaturu na 800°C ili 1.000°C.…”

Section: Slikaunclassified

Recovery of platinum-group metals (PGMS) from spent automotive catalysts: Part II: Automotive catalysts: Structures and principle of operation

Dimitrijevic¹,

Milic²,

Alagic³

et al. 2015

Rec odr raz

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IZVOD -Da bi se smanjilo zagaĎenje vazduha i ispoštovala zakonska regulative, u izduvne sisteme motornih vozila (putnička, teretna i druga vozila, a u poslednje vreme i graĎevinske i poljoprivredne mašine) ugraĎuju se katalizatori tj. katalitički konvertori. Njihov zadatak je da štetne proizvode sagorevanja tečnih fosilnih goriva prevedu u manje štetne produkte. U katalitičkim konvertorima, rodijum se koristi za redukciju, a platina i paladijum za oksidaciju gasova. U radu su prikazani struktura i princip rada auto katalizatora budući da su automobili najzastupljenija motorna vozila na putevima širom sveta i da se predviĎa da će bar do 2020. godine dominirati proizvodnja automobila sa benzinskim i dizel motorima.Ključne reči: auto katalizatori, struktura, princip rada ABSTRACT -Catalytic converters are incorporated into motor vehicle emission systems (passenger cars, trucks and other motor vehicles, as well as civil and agricultural machines, as of lately) to reduce air pollution as well as to meet the the emission standards.Their purpose is to convert toxic emissions generated by combustion of liquid fossil fuels into less harmful products. In catalytic converters, rhodium is used for the reduction of gasses, whereas platinum and palladium are used for the oxidation of gasses. This paper presents the structure and operating principle of automotive catalysts in view of the fact that cars are the most prevalent motor vehicles worldwide and due to the fact that the production of cars with gasoline and diesel engines will dominate until at least 2020.

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NOx Storage and Reduction for Diesel Engine Exhaust Aftertreatment

Cited by 17 publications

References 91 publications

Selective Catalytic Reduction of NO by NH₃ over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Selective Catalytic Reduction of NO by NH₃ over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Optimization of the Washcoat Slurry for Hydrotalcite-Based LNT Catalyst

Recovery of platinum-group metals (PGMS) from spent automotive catalysts: Part II: Automotive catalysts: Structures and principle of operation

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NOx Storage and Reduction for Diesel Engine Exhaust Aftertreatment

Cited by 17 publications

References 91 publications

Selective Catalytic Reduction of NO by NH3 over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Selective Catalytic Reduction of NO by NH3 over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Optimization of the Washcoat Slurry for Hydrotalcite-Based LNT Catalyst

Recovery of platinum-group metals (PGMS) from spent automotive catalysts: Part II: Automotive catalysts: Structures and principle of operation

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Selective Catalytic Reduction of NO by NH₃ over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments

Selective Catalytic Reduction of NO by NH₃ over Photocatalysts (Photo‐SCR): Mechanistic Investigations and Developments