Review of Vehicle Engine Efficiency and Emissions

Joshi, Ameya

doi:10.4271/2021-01-0575

Cited by 69 publications

(34 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, other differences, for example the road load determination, and the weight of the vehicle can further influence the CO 2 emissions in the order of 11-25% [19][20][21]. In 2019, for the third consecutive year, the average CO 2 emissions from light-duty vehicles in EU increased, reaching 122.4 g/km, making the 2021 target of 95 g/km challenging [22]. This means that the share of hybrids and electric vehicles has to be increased.…”

Section: Discussionmentioning

confidence: 99%

Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

et al. 2021

View full text Add to dashboard Cite

In the last years, the in-use emissions of vehicles are measured on the road with portable emissions measurement systems (PEMS). PEMS cannot measure as accurately as the laboratory grade equipment, and studies on their measurement uncertainty have continued since their appearance in the market. In this study we compared PEMS to laboratory grade equipment in Italian laboratories testing a diesel “Golden” (i.e., reference) vehicle for two consecutive years. The results showed equal means of PEMS and laboratory grade equipment for carbon dioxide (CO2), nitrogen oxides (NOx), and particle number (PN), with a variability of ±5 g/km for CO2, ±10 mg/km for NOx, and ±1 × 1011 p/km for PN, which further decreased in the second year. For carbon monoxide (CO), the PEMS were on average 5–20 mg/km higher than the bags (variability ±40 mg/km). The main conclusion of this study is that PEMS are accurate under controlled laboratory ambient conditions, without any indications of significant bias.

show abstract

Section: Discussionmentioning

confidence: 99%

Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Recent years have seen the introduction of several emission regulations based on the emission standard for diesel engines with the aim of ensuring sustainable development. 3 For instance, in the latest regulations, the amounts of permissible contaminants in diesel exhaust gases have been significantly reduced. 3 As a result, automakers are under pressure to reduce the emission of both NO x and harmful chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…3 For instance, in the latest regulations, the amounts of permissible contaminants in diesel exhaust gases have been significantly reduced. 3 As a result, automakers are under pressure to reduce the emission of both NO x and harmful chemicals. However, to date, considerable amounts of diesel fuel are still being used as an energy source for engines and power plants.…”

Section: Introductionmentioning

confidence: 99%

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Nguyen

Matyakubov

Saud

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

A two-stage plasma catalyst system for highthroughput NO x removal was investigated. Herein, the plasma stage involved the large-volume plasma discharge of humidified gas and was carried out in a sandwich-type honeycomb monolith reactor consisting of a commercial honeycomb catalyst (50 mm high; 93 mm in diameter) located between two parallel perforated disks that formed the electrodes. The results demonstrated that, in the plasma stage, the reduction of NO x did not occur at room temperature; instead, NO was only oxidized to NO 2 and n-heptane to oxygenated hydrocarbons. The oxidation of NO and n-heptane in the honeycomb plasma discharge state was largely affected by the humidity of the feed gas. Furthermore, the oxidation of NO to NO 2 occurs preferably to that of n-heptane with a tendency of the NO oxidation to decrease with increasing feed gas humidity. The reason is that the generation of O 3 decreases as the amount of water vapor in the feed gas increases. Compared to the catalyst alone, the two-stage plasma catalyst system increased NO x removal by 29% at a temperature of 200 °C and an energy density of 25 J/L.

show abstract

“…For health and environmental considerations, the current community strongly demands to improve air quality. Environmental protection agencies around the world have introduced more and more stringent motor vehicle exhaust emission regulations on CO, nitrogen oxides (NO x ), unburned hydrocarbons and particulate matter [1]. The commercial technology of pollutants elimination is to adopt efficient catalytic converters.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Alkali Metal Resistance for NH3-SCR Catalyst Cu/SSZ-13: Tune the Crystal Size

et al. 2021

View full text Add to dashboard Cite

To improve the alkali metal resistance of commercial catalyst Cu/SSZ-13 for ammonia selective catalytic reduction (NH3-SCR) reaction, a simple method to synthesize Cu/SSZ-13 with a core–shell like structure was developed. Compared with smaller-sized counterparts, Cu/SSZ-13 with a crystal size of 2.3 μm exhibited excellent resistance to Na poisoning. To reveal the influence of the crystal size on Cu/SSZ-13, physical structure characterization (XRD, BET, SEM, NMR) and chemical acidic distribution (H2-TPR, UV-Vis, Diethylamine-TPD, pyridine-DRIFTs, EDS) were investigated. It was found that the larger the crystal size of the molecular sieve, the more Cu is distributed in the crystal core, and the less likely it was to be replaced by Na to generate CuO. Therefore, a 2.3 μm sized Cu/SSZ-13 well-controlled the reactivity of the side reaction NH3 oxidation and the generation of N2O. The result was helpful to guide the extension of the service life of Cu/SSZ-13.

show abstract

Review of Vehicle Engine Efficiency and Emissions

Cited by 69 publications

References 51 publications

Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Improvement of Alkali Metal Resistance for NH3-SCR Catalyst Cu/SSZ-13: Tune the Crystal Size

Contact Info

Product

Resources

About

Review of Vehicle Engine Efficiency and Emissions

Cited by 69 publications

References 51 publications

Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

Measurements of the Emissions of a “Golden” Vehicle at Seven Laboratories with Portable Emission Measurement Systems (PEMS)

High-Throughput NOx Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

Improvement of Alkali Metal Resistance for NH3-SCR Catalyst Cu/SSZ-13: Tune the Crystal Size

Contact Info

Product

Resources

About

High-Throughput NO_x Removal by Two-Stage Plasma Honeycomb Monolith Catalyst