New applications of monolithic supported catalysts

Farrauto, Robert J.

doi:10.1007/bf02475684

Cited by 17 publications

(7 citation statements)

References 14 publications

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“…In general, Pt shows better performances with HC molecules and good oxidation activity also in presence of SO 2 , provided that the temperature is kept under control. However, at extreme temperatures (such as those obtained to trigger Diesel particulate filter (DPF) regeneration) Pt might undergo degradation [20,22]. On the contrary, Pd has displayed higher activities in the oxidation of light molecules (i.e., CH 4 , C 3 H 8 ) and an increased resistance to sintering at high temperatures [20].…”

Section: Diesel Oxidation Catalyst (Doc)mentioning

confidence: 99%

An Overview of Lean Exhaust deNOx Aftertreatment Technologies and NOx Emission Regulations in the European Union

et al. 2021

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This paper reviews the recent advances in the management of nitrogen oxide (NOx) emissions from the internal combustion engine of light-duty and heavy-duty vehicles, addressing both technical and legal aspects. Particular focus is devoted to the often-virtuous interaction between new legislation imposing more restrictions on the permitted pollutant emission levels and new technologies developed in order to meet these restrictions. The review begins first with the American and then European directives promulgated in the 1970s, aimed at limiting emissions of pollutants from road transport vehicles. Particular attention is paid to the introduction of the Euro standards in the European Union for light- and heavy-duty vehicles, used as a legal and time frame reference for the evolution of emission aftertreatment systems (ATSs). The paper also describes governmental approaches implemented for the control of pollutant emissions in circulating vehicles, such as market surveillance and in-service conformity. In parallel, it is explained how the gradual introduction of small-scale devices aimed at the NOx control, such as lean NOx traps (LNTs) systems, and, most of all, the selective catalytic reduction (SCR) of NOx, permitted the application to road-transport vehicles of this ATS, originally designed in larger sizes for industrial usage. The paper reviews chemical processes occurring in SCR systems and their advantages and drawbacks with respect to the pollutant emission limits imposed by the legislation. Their potential side effects are also addressed, such as the emission of extra, not-yet regulated pollutants such as, for example, NH3 and N2O. The NOx, N2O, and NH3 emission level evolution with the various Euro standards for both light- and heavy-duty vehicles are reported in the light of experimental data obtained at the European Commission’s Joint Research Centre. It is observed that the new technologies, boosted by increasingly stricter legal limits, have led in the last two decades to a clear decrease of over one order of magnitude of NOx emissions in Diesel light-duty vehicles, bringing them to the same level as Euro 6 gasoline vehicles (10 mg/km to 20 mg/km in average). On the other hand, an obvious increase in the emissions of both NH3 and N2O is observed in both Diesel and gasoline light-duty vehicles, whereby NH3 emissions in spark-ignition vehicles are mainly linked to two-reaction mechanisms occurring in three-way catalysts after the catalyst light-off and during engine rich-operation. NH3 emissions measured in recent Euro 6 light-duty vehicles amount to a few mg/km for both gasoline and Diesel engines, whereby N2O emissions exceeding a dozen mg/km have been observed in Diesel vehicles only. The present paper can be regarded as part of a general assessment in view of the next EU emission standards, and a discussion on the role the SCR technology may serve as a NOx emission control strategy from lean-burn vehicles.

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Section: Diesel Oxidation Catalyst (Doc)mentioning

confidence: 99%

An Overview of Lean Exhaust deNOx Aftertreatment Technologies and NOx Emission Regulations in the European Union

et al. 2021

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“…The excellent properties of monolithic catalysts demonstrated in systems for the decontamination of automobile exhaust gases has led to attempts to apply this type of catalyst to other processes such as hydrotreatment, methanation, fuel cells and biochemical reactions [4], those for stationary source emission control [64] being the ones most extensively developed. In this type of process, thermal shock resistance or thermal stability is less important but high surface area and high amounts of support material per unit volume of monolith are necessary.…”

Section: Monoliths As Catalytic Supports: High Surface Area Monolithsmentioning

confidence: 99%

Monolithic reactors for environmental applications

Ávila

Montes

Miró

2005

Chemical Engineering Journal

486

278

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“…The same crystalline phases are registered in binary (No. 5-10) and three component systems (11)(12)(13)(14)(15)(16).…”

Section: Resultsmentioning

confidence: 99%

“…Impregnation of this layer followed by annealing enables one to obtain on its surface catalyt ically active compounds based on the products of ther mal decomposition of respective salts in the form of a solid layer or as individual areas ("islets"). Note that the interest in catalysts on metallic substrates is related to the possibility of fabricating different simple and complex forms on their basis, for instance, honey comb structures with thin walls and high heat transfer rate, including those to be applied in microchannel reactors to conduct coupled reactions [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

Tyrina

Руднев

Lukiyanchuk

et al. 2015

Prot Met Phys Chem Surf

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Coatings on aluminum alloy containing one or several crystalline oxides of cobalt, copper, and cerium deposited in different sequences have been obtained by a combination of methods of plasma electro lytic oxidation and impregnation followed by annealing. It has been established that the composition of sur face layers and the catalytic activity of composites depend on the sequence of deposition of active components on the substrate. Cu 2+ , Cu + , Co 3+ , Ce 4+ , and Ce 3+ are present in the surface and subsurface layers. All the studied composites are characterized by catalytic activity in the reaction of oxidation of CO into CO 2 . Of the studied composites, the following are most active: Ce

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New applications of monolithic supported catalysts

Cited by 17 publications

References 14 publications

An Overview of Lean Exhaust deNOx Aftertreatment Technologies and NOx Emission Regulations in the European Union

An Overview of Lean Exhaust deNOx Aftertreatment Technologies and NOx Emission Regulations in the European Union

Monolithic reactors for environmental applications

Silicate anodic coatings on aluminum containing oxides of cobalt and/or copper and/or cerium and their activity in CO oxidation

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