Vehicle emissions trapping materials: Successes, challenges, and the path forward

Lee, Jungkuk; Theis, Joseph R.; Kyriakidou, Eleni A.

doi:10.1016/j.apcatb.2018.10.069

Cited by 190 publications

(97 citation statements)

References 94 publications

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“…This results in that 80%-90% of the pollutants are emitted during the cold-start [1][2][3][4]. It is, therefore, desirable to trap NOx and HC [5] at low temperature and release these components when the catalyst system is above the light-off temperature and able to efficiently convert them to N 2 , CO 2 , and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Zeolite Beta Doped with La, Fe, and Pd as a Hydrocarbon Trap

et al. 2020

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Hydrocarbon trapping is a technique of great relevance, since a substantial part of hydrocarbon emissions from engines are released from engines before the catalyst has reached the temperature for efficient conversion of the hydrocarbons. In this work, the influence of doping zeolite beta (BEA) with Fe, Pd, and La on the storage and release of propene and toluene is studied. Five monolith samples were prepared; Fe/BEA, La/BEA, Pd/BEA, Pd/Fe/BEA, and Pd/La/BEA using incipient wetness impregnation, and the corresponding powder samples were used for catalyst characterization by Inductively coupled plasma sector field mass spectrometry (ICP-SFMS), Temperature-programmed oxidation (TPO), X-ray photoelectron spectroscopy (XPS) and Scanning transmission electron microscopy with Energy dispersive X-ray analysis (STEM-EDX). The hydrocarbon trapping ability of the samples was quantified using Temperature-programmed desorption (TPD) of propene and toluene, and in situ Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The results from the TPD experiments show that the addition of Pd and La to the zeolite affected the release patterns of the stored hydrocarbons on the trapping material in a positive way. The in situ DRIFTS results indicate that these elements provide H-BEA with additional sites for the storage of hydrocarbons. Furthermore, EDX-mapping showed that the La and Pd are located in close connection.

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Section: Introductionmentioning

confidence: 99%

Zeolite Beta Doped with La, Fe, and Pd as a Hydrocarbon Trap

et al. 2020

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“…In addition, to avoid an extra energy demand, this process must function in a passive way. This implies that the oxidation reaction must occur within the operating temperature range of the exhaust pipe [5][6][7][8]. Passive filter regeneration technology is used in the commercial Continuously Regenerating Trap system (CRT, Johnson Matthey, London, UK).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the metallic promotion of these oxides has been studied, to achieve better catalytic performance. In this context, the development of Ag-containing oxidic catalysts has received attention in recent years [5,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]. In the case of the combustion of particulate matter, these catalysts have been reported as very active [42][43][44]47].…”

Section: Introductionmentioning

confidence: 99%

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

et al. 2019

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This work presents the physicochemical characterization and activity of zirconia-supported silver catalysts for the oxidation of pollutants present in diesel engine exhaust (propane, propene, naphthalene and soot). A series of silver-supported catalysts AgxZ (x = 1, 5 and 10 wt.%, Z = zirconia) were prepared, which were studied by various characterization techniques. The results show that silver is mainly found under the form of small metal nanoparticles (<10 nm) dispersed over the support. The metallic phase coexists with the AgOx oxidic phases. Silver is introduced onto the zirconia, generating Ag–ZrO2 catalysts with high activity for the oxidation of propene and naphthalene. These catalysts also show some activity for soot combustion. Silver species can contribute with zirconia in the catalytic redox cycle, through a synergistic effect, providing sites that facilitate the migration and availability of oxygen, which is favored by the presence of structural defects. This is a novel application of the AgOx–Ag/ZrO2 system in the combustion reaction of propene and naphthalene. The results are highly promising, given that the T50 values found for both model molecules are quite low.

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“…In recent years, acute haze pollution has become a serious threat to human health . Especially, particulate matter (PM) mostly emitted from the power plants, cement factories, and the metallurgical industry contributes to significant effects on the global mortality . In response to these PM pollution, porous and fibrous membranes are widely placed at high temperature areas where PM is initially released to maximize the filtration efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…1 Especially, particulate matter (PM) mostly emitted from the power plants, cement factories, and the metallurgical industry contributes to significant effects on the global mortality. 2,3 In response to these PM pollution, porous and fibrous membranes are widely placed at high temperature areas where PM is initially released to maximize the filtration efficiency. Some limitations still exist, such as low filtration efficiency, high air resistance and complicated preparation procedures.…”

Section: Introductionmentioning

confidence: 99%

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

et al. 2019

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Ceramic foams with extensive interconnected pores have great application potential in high‐temperature particulate matter (PM) capture. Considering that there are still challenges to synthesize ceramic foams with efficient filtration, a novel hierarchical‐structured alumina foam with three‐dimensional (3D) reticular architecture has been fabricated via combining chemical grafting pore‐forming agent and polyurethane (PU) foaming technology. Carbon black is grafted with carbamate functional groups in order to enable a better dispersion in highly viscous PU. Submicrometer and micrometer‐sized pores on the cell walls are observed in hierarchical‐structured ceramic foams. The resulting alumina foam exhibits 95.2% removal efficiency for PM particles and low pressure drop of only 50 Pa when grafted carbon black content is 3 wt%. This filtration performance is much higher than that of existing ceramic materials. These features, combined with our experimental design strategy, provide a new insight to design high‐temperature PM filtration materials with durable high performance.

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Vehicle emissions trapping materials: Successes, challenges, and the path forward

Cited by 190 publications

References 94 publications

Zeolite Beta Doped with La, Fe, and Pd as a Hydrocarbon Trap

Zeolite Beta Doped with La, Fe, and Pd as a Hydrocarbon Trap

Zirconia-Supported Silver Nanoparticles for the Catalytic Combustion of Pollutants Originating from Mobile Sources

Novel design of alumina foams with three‐dimensional reticular architecture for effective high‐temperature particulate matter capture

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