نتایج جستجو برای: soot oxidation
تعداد نتایج: 120227 فیلتر نتایج به سال:
The effect of oxidation on nascent soot particles is investigated in this work by means Raman spectroscopy. Three different particle samples are produced a lightly sooting ethylene/air laminar premixed flame and collected at residence times. characterized size primary degree aging hence graphitization, they representative the early evolution flames. Oxidation induced exposing to high temperatur...
Numerous definitions and analytical techniques for elemental (or black) carbon (EC) have been published in the scientific literature, but still no generally accepted interdisciplinary definition exists. EC is not a single chemical compound, but is mainly composed of two parts of carbon contents: combustion residues from pyrolysis and combustion emissions formed via gas-to-particle conversion. A...
Anthropogenic and biogenic gas emissions contribute to the formation of secondary organic aerosol (SOA). When present, soot particles from fossil fuel combustion can acquire a coating of SOA. We investigate SOA-soot biogenic-anthropogenic interactions and their impact on ice nucleation in relation to the particles' organic phase state. SOA particles were generated from the OH oxidation of napht...
In this study, nano-structure ceria with three different morphologies (nanorod, nanoparticle and flake) have been prepared by hydrothermal and solvothermal methods. The ceria samples were deeply characterized by XRD, SEM, TEM, H2-TPR, XPS and in-situ DRIFTS, and tested for soot combustion in absence/presence NO atmospheres under loose and tight contact conditions. The prepared ceria samples exh...
This review article summarizes the contents of the keynote lecture with the same tittle presented at the 7 th edition of the International Conference on Environmental Catalysis hold in Lyon (France) in September 2012. Different aspects of the ceria-catalyzed Diesel soot combustion reactions have been critically discussed, such as the high catalytic activity of ceria for Diesel soot combustion i...
The energy efficiency of Gasoline Direct Injection (GDI) engines is leading to a continuous increase in GDI engine vehicle population. Consequently, their particulate matter (soot) emissions are also becoming concern. As required for diesel engines, meet the limits set by regulations, catalyzed filters considered as an effective solution through which soot could be trapped and burnt out. Howeve...
Vacuum-drying and freeze-drying were adopted to improve the catalytic activity of Ce 0.5 Pr O 2 for soot combustion. The specific surface area pore volume as-prepared greatly increased compared counterpart using common drying method. Furthermore, redox performance oxidation ability enhanced, as demonstrated by H -TPR soot-TPR. Thus, lower combustion temperatures higher intrinsic obtained. This ...
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