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Mostrando 881 - 900 Resultados de 2,617 Para Buscar '"reaction rate"', tiempo de consulta: 0.30s Limitar resultados
  1. 881
    “…Here we report the direct electrocatalytic reduction of low concentration CO(2) by a Re(i)-complex catalyst that possesses CO(2)-capturing ability in the presence of triethanolamine. The reaction rate and faradaic efficiency of CO(2) reduction were almost the same when using Ar gas containing 10% CO(2) or when using pure CO(2) gas, and the selectivity of CO formation was very high (98% at 10% CO(2)). …”
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  2. 882
    “…Among all heterostructures studied, that obtained by FeCl(3)-activation yielded complete conversion of acetaminophen after 6 h of reaction under solar-simulated irradiation, also showing high conversion after successive cycles. Although the reaction rate was lower than the observed with bare TiO(2), the heterostructure showed higher settling velocity, thus being considerably easier to recover from the reaction medium.…”
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  3. 883
  4. 884
    “…Samples of CA in the fermentation broths showed a fast decline of concentration during the first 5 h followed by a slower, but stable, reaction rate in the subsequent hours. A reversible-irreversible kinetic model was applied to explain the degradation rate of CA, its dependence on temperature and concentration. …”
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  5. 885
    “…The Au(2)Pt(2)/N–TiO(2) catalyst, herein with the irradiation wavelength in the range 460–800 nm, exhibited a reaction rate ~24 times greater than that of TiO(2), and the apparent quantum yield at 500 nm reached 5.86%, indicative of the successful functionalization of N–TiO(2) by the integration of Au plasmonic NPs and the Pt cocatalyst. …”
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  6. 886
    “…Therefore, from a synthesis point of view, the corresponding 4-hydroxyvalerate esters could be obtained even at a higher reaction rate. The addition of sulfonated triphenylphosphine ligand (TPPTS) allowed reduction of the system pressure and resulted in the higher selectivity towards GVL.…”
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  7. 887
    “…The FTIR results show that, among the examined nanoparticles, exfoliated graphite (EG) with a predominantly two-dimensional (2D) shape favors the hardening process of the epoxy matrix, increasing its reaction rate. As evidenced by the FTIR signal related to the epoxy stretching frequency (907 cm(−1)), the accelerating effect of the EG sample increases as the filler concentration increases. …”
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  8. 888
    “…Under the experimental pressure conditions, the theoretically calculated total reaction rate constants agree well with the limited experimental data, including the negative temperature dependence at low temperature. …”
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  9. 889
    “…Microreactors have better energy efficiency, reaction rate, safety, a much finer degree of process control, better molecular diffusion, and heat-transfer properties compared with the conventional batch reactor. …”
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  10. 890
    “…This paper reports on the effects of temperature and amine (PEI) loading on CO(2) adsorption capacity and estimated kinetic parameters through modeling of selected models which represent the reaction rate and diffusion rate models. The studied adsorbents showed the highest adsorption capacity at 75 °C with 60 wt % PEI loading. …”
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  11. 891
    por Funazukuri, Toshitaka, Ozawa, Shingo
    Publicado 2019
    “…It can be expected to increase the reaction rate or decrease temperature by decreasing the crystallinity. …”
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  12. 892
    “…A positive correlation between the steric and electronic properties of the phosphane and the reaction rate was observed. Further investigation of the steric influence of the alkoxy-bridged clusters on OAT was probed through the use of POV clusters with bridging alkoxide ligands of varying chain length ([V(6)O(7)(OR′)(12)]; R′ = Et, (n)Pr). …”
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  13. 893
    “…On the other hand, the effects of different parameters (such as the catalyst mass (TiO(2) Degussa P-25), stirring speed (RPM), UV lamps, and temperature) over the photocatalysis reaction rate were analyzed. Also, the reaction’s thermodynamic parameters were determined and found to be similar to those found in other investigations. …”
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  14. 894
    “…The metal-free sustainable strategy was employed for the diverse construction of valuable five-and six-membered polycyclic N,O-heteroaromatics such as oxazoles, 1,4-oxazines, and oxazin-2-one with a rapid reaction rate and high yield. The viability of this mild nonmetallic catalysis is successfully verified through syntheses of labile chiral heterocyclic analogues. …”
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  15. 895
    “…The chemical class a compound belongs to predicted the signalling ability of a compound only to a minor extent, whereas compound characteristics such as its reaction rate with atmospheric oxidants, biosynthesis rate upon herbivory and volatility were much more important predictors. …”
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  16. 896
    “…The highest apparent reaction rate of the photodegradation of methylene blue was observed for the sample pre-reduced in Ar at 1300 °C for 5 h and then calcined in air at 400 °C for 25 h. …”
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  17. 897
    “…The GCN–ZnO0.4 sample also showed enhanced adsorption and photocatalytic activity performance, resulting in an increased reaction rate value up to 3 times that of GCN–pure, which was attributed to the phenomenon of better separation of photogenerated charge carriers resulting because of heterojunction development among interfaces of GCN–pure and ZnO. …”
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  18. 898
    “…The mono- and di-ortho-alkyl substituted sulfonyl chlorides exhibit an enhanced reactivity although both inductive and steric effects lower the reaction rate. The DFT calculations of their structures together with X-ray data showed that an increased reactivity is mainly due to a peculiar, rigid, strongly compressed and sterically congested structure. …”
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  19. 899
    “…In this case, the mass transfer and reaction rate control the dissolution pattern. This article aimed to study the interaction between an acid nanoemulsion system and a carbonate porous media. …”
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  20. 900
    “…The key modeling challenges addressed include incorporating the impact of uncertainties in parameters such as heat and mass transfer coefficients and reaction rate constants. Preliminary simulations demonstrate a proof of concept for the use of simulation for gaining insights into the feasibility of a process scale-up for an industrial-scale AACVD.…”
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