Effect of lanthanum loading on nanosized CeO2-ZnO solid catalysts supported on cordierite for diesel soot oxidation

Nascimento, Leandro Fontanetti do; Lima, José Fernando de; Filho, Paulo C. de Sousa; Serra, Osvaldo Antônio

doi:10.1016/j.jes.2018.01.011

Cited by 35 publications

(12 citation statements)

References 38 publications

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“…The better performance observed for the silver-doped catalytic coating was attributed to an effective soot-catalyst contact improving migration of active oxygen species from catalyst to soot. The same authors also synthesized a Ce-Zn-La mixed oxide (CeO 2 -ZnO-La 2 O 3 ) using a lactic acid-mediated sol-gel method, which efficiently coated cordierite substrates for soot capture and combustion [26].…”

Section: Sic Grainmentioning

confidence: 99%

“…Catalysts 2020, 10, x FOR PEER REVIEW 6 of 16 silver-doped catalytic coating was attributed to an effective soot-catalyst contact improving migration of active oxygen species from catalyst to soot. The same authors also synthesized a Ce-Zn-La mixed oxide (CeO2-ZnO-La2O3) using a lactic acid-mediated sol-gel method, which efficiently coated cordierite substrates for soot capture and combustion [26]. Maunula et al [27] used a proprietary sol-gel method, based on sols with small particles (<100 nm by diameter), to obtain a uniform and well-dispersed coating (containing precious metal-Pt, Pd-as active component) of SiC filter walls that resulted in a lower pressure drop than a nonuniform coating obtained with typical wash-coat slurry.…”

Section: Sic Grainmentioning

confidence: 99%

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The Issue of Soot-Catalyst Contact in Regeneration of Catalytic Diesel Particulate Filters: A Critical Review

Lisi¹,

Landi²,

Sarli³

2020

Catalysts

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Soot-catalyst contact represents the main critical issue for an effective regeneration of catalytic (i.e., catalyst-coated) diesel particulate filters (DPFs). Most of the literature reviews on this topic have mainly been focused on studies dealing with powdered soot-catalyst mixtures. Although the results obtained on powders surely provide significant indications, especially in terms of intrinsic activity of materials towards soot oxidation, they cannot be directly extended to DPFs due to completely different soot-catalyst contact conditions generated during filtration and subsequent regeneration. In this work, attention is devoted to catalytic DPFs and, more specifically, studies on both catalyst dispersion and soot distribution inside the filter are critically reviewed from the perspective of soot-catalyst contact optimization. The main conclusion drawn from the literature analysis is that, in order to fully exploit the potential of catalytic DPFs in soot abatement, both a widespread and homogeneous presence of catalyst in the macro-pores of the filter walls and a suitably low soot load are needed. Under optimal soot-catalyst contact conditions, the consequent decrease in the temperature required for soot oxidation to values within the temperature range of diesel exhausts suggests the passage to a continuous functioning mode for catalytic filters with simultaneous filtration and regeneration, thus overcoming the drawbacks of periodic regeneration performed in current applications.

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Section: Sic Grainmentioning

confidence: 99%

Section: Sic Grainmentioning

confidence: 99%

The Issue of Soot-Catalyst Contact in Regeneration of Catalytic Diesel Particulate Filters: A Critical Review

Lisi¹,

Landi²,

Sarli³

2020

Catalysts

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“…Up to date, several transition metal oxides, including Ce, Co, Mn, Fe, Cu, V, and Mo [6][7][8][9][10][11][12][13][14][15], have been demonstrated as catalysts to decompose soot. Ce, especially CeO 2 , has become a particularly attractive catalyst for soot oxidation as CeO 2 exhibits a relatively high oxygen storage capacity via the redox cycle between Ce 4+ and Ce 3+ for reversibly adding/removing oxygen, making CeO 2 possess high catalytic activities [1,16].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

et al. 2021

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As CeO2 is a useful catalyst for soot elimination, it is important to develop CeO2 with higher contact areas, and reactivities for efficient soot oxidation and catalytic soot oxidation are basically controlled by structures and surface properties of catalysts. Herein, a Ce-Metal organic framework (MOFs) consisting of Ce and benzene-1,3,5-tricarboxylic acid (H3BTC) is employed as the precursor as CeBTC exhibits a unique bar-like high-aspect-ratio morphology, which is then transformed into CeO2 with a nanoscale bar-like configuration. More importantly, this CeO2 nanobar (CeONB) possesses porou, and even hollow structures, as well as more oxygen vacancies, enabling CeONB to become a promising catalyst for soot oxidation. Thus, CeONB shows a much higher catalytic activity than commercial CeO2 nanoparticle (comCeO) for soot oxidation with a significantly lower ignition temperature (Tig). Moreover, while soot oxidation by comCeO leads to production of CO together with CO2, CeONB can completely convert soot to CO2. The tight contact mode also enables CeONB to exhibit a very low Tig of 310 °C, whereas the existence of NO also enhances the soot oxidation by CeONB to reduce the Tig. The mechanism of NO-assisted soot oxidation is also examined, and validated by DRIFTS to identify the formation and transformation of nitrogen-containing intermediates. CeONB is also recyclable over many consecutive cycles and maintained its high catalytic activity for soot oxidation. These results demonstrate that CeONB is a promising and easily prepared high-aspect-ratio Ce-based catalyst for soot oxidation.

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“…Though the limitation of this technique is in the elemental information, it can't give a proper identification of polymer type. On the other hand, Raman spectroscopy give specific polymer identification information through fingerprint spectrum ( Nascimento et al., 2018 ; Schwaferts et al., 2020 ). Because of the small size of MPs, produce a weak Raman spectrum.…”

Section: Introductionmentioning

confidence: 99%

Microplastics contamination in the soil from Urban Landfill site, Dhaka, Bangladesh

Afrin

Uddin

Rahman

2020

Heliyon

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Microplastics (MP) pollution has become a matter of global concern because of its several deleterious effects on environmental health, especially on the terrestrial environment. The evidence of MP contamination in terrestrial environment is less explored compared to aquatic bodies. However, in Bangladesh despite having high possibility of MP contamination, there is lacking of available research-based evidence. Urban areas soil is subjected to act as a major environmental reservoir for MPs. Thus, this study was carried out to investigate the presence of MP contamination in constructed landfill sites near Dhaka city, Bangladesh. Ten unmixed soil samples were collected from the Aminbazar Sanitary landfill sites, from that thirty replicated samples were investigated via Fourier Transform Infrared Spectroscopy (FT-IR) analysis and Stereomicroscope. The range of physicochemical parameters were found in the soil samples as follows: moisture content; 15.84%-56.54%; soil pH; 5.76-6.02, electric conductivity; 0.1 μs/cm-2.43 μs/cm, alkalinity; 6.7 AE 1.528-14.33 AE 0.577, TOC; 0.18% AE 0.02-1.09 AE 0.03. Among the ten samples, 3 samples were identified to have the presence of MP in the form of Low density polyethylene (LDPE), High density polyethylene (HDPE), and Cellulose acetate (CA) respectively. The detection limit ranged from 1-2000 μm. Hence, the results show that the procurement and discharge of MPs in the landfills is an overlong process. The results of this study provide an initial evidence and affirm that landfill can be a potential source of MPs. This study indicates that MPs are comparatively overlong outcome of human induced activities which can significantly cause changes in terrestrial ecosystems.

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Effect of lanthanum loading on nanosized CeO2-ZnO solid catalysts supported on cordierite for diesel soot oxidation

Cited by 35 publications

References 38 publications

The Issue of Soot-Catalyst Contact in Regeneration of Catalytic Diesel Particulate Filters: A Critical Review

The Issue of Soot-Catalyst Contact in Regeneration of Catalytic Diesel Particulate Filters: A Critical Review

Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy

Microplastics contamination in the soil from Urban Landfill site, Dhaka, Bangladesh

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