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    Daniel Mastral Pdf

    This. DO FILHO DO FOGO AO GUERREIRO DA LUZ - Daniel Mastral. publication was reported as an alleged copyright violation. Publishers may not upload. Missões by Daniel Mastral & Isabela Mastral is Religion & Spirituality Vamos conhecer bases bíblicas sólidas que serão estribo para. GUERREIROS DA LUZ by Daniel Mastral is Religious Tendo deixado a Irmandade há dois anos,. Daniel Mastral conhece sua noiva Isabela e.

    Oxidation rates were characterized by the temperature of half- 17 September conversion T50 and by the quantity of oxygen consumed during the reaction, which allows to determine Accepted 20 September the amount of the solid hydrocarbon initially mg of a mixture of 0. A preliminary study carried out with two selected hydrocarbons showed that turnover frequencies Keywords: Hydrocarbon catalytic oxidation TOF are little dependent on the Pt loading. The hydrocarbons should be vaporized before them to react Diesel oxidation catalysts with the Pt catalyst. Ideally, temperatures of light-off and of vaporization should coincide for the optimal Pt catalysts transformation into CO2. A comparison with light- Diesel soot off tests performed in a stream of gaseous hydrocarbon vaporized upstream the catalyst showed that Polycyclic aromatic hydrocarbons PAH oxidation rates depend on the same structural parameters, except when the hydrocarbon is too volatile Structural effects of hydrocarbon molecules i. In the first case, a large HC fraction is desorbed without being oxidized while in the second case, oxidation rate is limited by the vaporization. All rights reserved. Introduction oxidation processes for gas cleanup of incinerators or combus- tion units [24,25].

    Comparison between naphthalene and methylnaphthalene are often chosen as model PAH analyses in the Diesel fuel and in the exhaust gas seems to compounds for testing oxidation catalysts [18—23]. Naphthalene show that a significant part of certain PAH are not converted in derivatives and heavier aromatics pyrene, anthracene, fluoran- the engine and survive in the exhaust gas [28].

    The high stabil- E-mail address: daniel. Diehl et al. For heavier hydrocarbons, this technique could not be Due to the fact that the hydrocarbon starts to vaporize before applied. Oxidation tests were then carried out using the classical it can be oxidized, NO2 exp is always smaller than NO2 th. In this method employed for diesel soot oxidation: the solid hydrocarbon approach, HC conversion is calculated on the basis of O2 con- is intimately mixed with the platinum catalyst and light-off profiles sumption profile NO2 vs.

    For instance, T50 is the temperature are recorded with oxygen only in the gas [30—32]. Several tests were repeated to determine the interval of confidence of the light-off 2.

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    Experimental temperatures. Oxidation of solid hydrocarbons may 2. These products were not system- The condition of the test made that a relatively high sample atically analyzed but their presence generally less than a few weight was used for each light-off test. Experi- ments were carried out on a 0.

    The support grain size: 2—4 mm; 3. This chlorination ensures constant HC and O2 concentration at the reactor inlet ppm C a homogeneous distribution of Pt in the alumina balls. After impregnation with ing between 0. No change of textural properties was noticed after are reported in Table 1.

    Specific activity and turn-over frequency Pt impregnation, drying and calcination. Chemical analyses led to are virtually constant for the 0. The low-loaded catalysts were size.

    Trans- mission Electron Microscopy showed very small Pt particles below 3. Hydrocarbon oxidation: comparison between the two 1. Light-off tests Catalytic oxidation of some hydrocarbons could be carried out both in the saturator reactor results in ref.

    All the light-off curves recorded in the two reaction systems N being the other experiments were carried out in a soot oxidation the name of the hydrocarbon, N corresponds to light-off in the reactor. Two grams of 0. This ratio dation reactor. Except for naphthalene, oxidation occurs at higher corresponds, for instance, to 40 mg coronene in 2 g of catalyst.

    Naphthalene being relatively easy mixture 6.

    It is assumed that the oxidation reaction produces only CO2 and water according to eq. Light-off curves for selected the theoretical amount of O2 NO2 th required for total oxidation.

    HC are reported in Fig. For all the tested hydrocarbons, the F. Effect of the platinum loading. For each by Eq. Correlation of light-off temperatures with physical ing point Tb , enthalpy of vaporization at T50 are reported in the parameters of hydrocarbons Tables.

    The correlation seems much Table 2a Structure, physical properties and oxidability T50 of selected CC19 hydrocarbons. The deviation between the theoretical values given by Eq. If n-alkanes and hexamethylbenzene are 3. The results are represented on Fig. Comparison between the two reaction systems. Filled symbols: Fig. Light-off curves of selected hydrocarbons containing 20 atoms C or more in oxidation of solid hydrocarbons mg of a physical mixture of 0. Same conditions as in Fig.

    An attempt was made to correlate the fraction 7 8 9 Chrysene of O2 consumed with the light-off temperature of the hydrocar- 4 10 Triphenylmethane 3 11 Eicosane n-C20 bons. Reaction mechanism. Vaporization and oxidation. Correlation between light-off temperatures half conversion, T50 and boiling temperatures Tb of the hydrocarbons. Light-off curves of selected hydrocarbons containing less than 20 atoms C in the molecule.

    Oxidation is performed over mg of a physical mixture of Fig. Correlation between light-off temperatures half conversion, T50 and num- 0. Dotted line: theoretical HC conversion by oxidation. For the most volatile compounds for instance, naphthalene , the second step see Fig.

    However, the naphtha- in Fig. The oxidation rate of solid hydrocarbons is thus strongly lene concentration becomes very high and the small fraction that related to their volatility. As suggested by the good correlation is oxidized reacts rather rapidly: the apparent T50 is lower than in a between T50 and boiling temperatures for PAH molecules Fig.

    For heavy it seems that the molecular structure would have similar effects on PAHs, the volatilization plays a major role, which confirms that no both oxidability and volatility.

    The question arises to know if the rate of hydrocarbon oxida- are parameters representing at the best the T50 and the boiling tion is only governed by the vaporization step. The whole process temperatures. The behavior of aerosols containing thousands of of the oxidation in the soot reactor can be depicted in Fig. The organic compounds was recently depicted in terms of molecular solid hydrocarbon is first volatized and the concentration varies structure-physical properties relationship.

    The hydrocarbon is behavior of the organic compounds in the aerosols including their not only vaporized but also oxidized. The conversion rate is repre- transformation by different oxidation processes. Combining the To sum up, the molecular structure of PAH may have similar vaporization curve V and the oxidation conversion curve Xox leads effects on their oxidability and on their volatility and it seems to the outlet concentrations depicted in Fig.

    However, conflicting results can relatively high vapor pressure at moderate temperature and can be be obtained when the volatility is too low, which suggests that the largely volatized before its oxidation starts case of naphthalene, hydrocarbon cannot be significantly oxidized in the solid state.

    This is the case of normal paraffins whose oxidation rate decreases with the number of carbons in the molecule Fig.

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    The reverse ten- dency was observed when the hydrocarbon is vaporized upstream 1 Naphthalene the catalyst. However, palladium is often 6 9 17 11 Triphenylmethane added to improve the metal stability [7,35,36]. It would be useful to 8 12 Eicosane n-C20 4 16 13 Benzo[k]fluoranthene extend the same study to Pt-Pd or Pd-only catalysts to compare the 3 14 Benzo[ghi]perylene behavior of these two metals in the oxidation of heavy molecules. Conclusions 19 Rubrene 20 Hexaphenylbenzene 1 Oxidation of solid hydrocarbons mixed with a Pt catalyst is strongly dependent on their volatility.

    A great part of the hydrocarbon is F. Garetto, C. Apesteguia, Catal. Today 62 — Gelin, M. Primet, Appl. B: Environ. Choudhary, S. Banerjee, V. Choudhary, Appl. A: Gen. Demoulin, B.

    Le Clef, M. Navez, P. Ruiz, Appl. Patterson, D. Angove, N. Cant, Appl.

    For most of the 20 hydrocarbons tested from C10 to C42 , oxida- [18] F. Klingstedt, A. Neyestanaki, L. Lindfors, T. Ollonqvist, J. Garcia, B. Solsona, S. Taylor, Catal.

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