Oxides comparisons

Direct Oxidation of Propylene to Propylene Oxide. Comparison of ethylene (qv) and propylene gas-phase oxidation on supported silver and silver—gold catalysts shows propylene oxide formation to be 17 times slower than ethylene oxide (qv) formation and the CO2 formation in the propylene system to be six times faster, accounting for the lower selectivity to propylene oxide than for ethylene oxide. Increasing gold content in the catalyst results in increasing acrolein selectivity (198). In propylene oxidation a polymer forms on the catalyst surface that is oxidized to CO2 (199—201). Studies of propylene oxide oxidation to CO2 on a silver catalyst showed a rate oscillation, presumably owing to polymerization on the catalyst surface upon subsequent oxidation (202). 

SCHWARZ K, BERTELSEN L H, NISSEN L R, GORDNER P T, HEINONEN M I, HOPIA A, HUYNH-BA T, LOMBELET p, MCPHAIL D, SKIBSTED L H and TIJBURG L (2001) Investigation of plant extracts for the protection of processed foods against lipid oxidation. Comparison of antioxidant assays based on radical scavenging, lipid oxidation and analysis of the principal antioxidant components, Eur Food Res Technol, 212, 319-28. 

H. S. I. Chao, G. A. Berchtold, Aromatization of Arene 1,2-Oxides. Comparison of the Aromatization Pathways of 1-Carboxy-, 1-Carbomethoxy-, 1-Formyl-, l-(Hydroxyme-thyl)-, and l-(2-Hydroxy-2-propyl)benzene Oxide ,./. Am. Chem. Soc. 1981,103, 898 -902. 

Fig. 11. Evaluation of kinetic parameters for the DOC model—CO and HC oxidation. Comparison of experimentally observed and simulated outlet concentrations in the course of the oxidation light-off for simple mixtures (a) CO, reaction Rl (b) Ci0H22, reactions R4 and R7 (cf. Table II). Lab experiments with isothermal monolith sample using synthetic gas mixtures (14% 02, 6% C02, 6% H20, N2 balance). Rate of temperature increase /min, SV = 30,000 h 1 (Kryl et al., 2005). Reprinted with permission from Ind. Eng. Chem. Res. 44, 9524, 2005 American Chemical Society.

Aki SNVK, Abraham MA. An economical evaluation of catalytic supercritical water oxidation comparison with alternative waste treatment technologies. Environ Prog 1998 17(4) 246-255. 

Isoquinoline is more reactive at the 1-position than quinoline is at the 2-position by approximately the same factor by which the 1-position of naphthalene is more reactive than the 2-position this is true also for the N-oxides. Comparison of the rate data for quinoline and quinoxaline (11.15), and the data in 11.59, suggests that replacement of =CH— by =N— accelerates the exchange at the 2- and 3-positions by factors of 135 and 20, respectively. The low reactivity of quinoxaline N-oxide seems anomalous and may be in error. 

Bukowinski, M. S. T. (1982). Pressure effects on bonding in calcium oxide comparison with magnesium oxide. J. Geophys. Res. 87B, 303-19. 

The electrocatalytic materials were deposited onto ceramic sheets in the form of nanosized parricle-containing inks. The electrocatalytic ink was prepared from carbon black-supported antimony-doped tin oxide. Comparisons were made between the commercially available Sb-doped SnOa as well as the Sb-doped Sn02 prepared by a solgel method. 

Kveder, S. Iskrc, S. Zambeli, N. Hadzija, O. The behaviour of some benzene derivatives on thin layers of aluminum oxide—Comparison with plain and Fe(III) impregnated silica gel. J. Liq. Chromatogr. 1991, 14 (18), 3277-3282. 

In addition to having a good CO tolerance, Pt-Ru electrocatalysts must also have a high activity for H2 oxidation. Comparison of the mass-specific activity of a PtRu2o electrocatalyst with a commercial Pt-Ru 1 1 alloy electrocatalyst for the oxidation of pure H2 showed that its activity is tluee times that of the commercial alloy. This indicates that even for a low Pt coverage on Ru, its activity for H2 oxidation is preserved, a prerequisite for an active CO tolerant catalyst. Comparing the CO tolerance of the PtRu2o electrocatalyst with that of two commercial Pt-Ru alloy electrocatalysts for the oxidation of 1095 ppm CO in H2 confirmed the exceptional stability of the former (Fig. 20) the measurements... 

Pajo L., Tamborini G., Rasmussen G., Mayer K., and Koch L. 2001b. A novel isotope analysis of oxygen in uranium oxides comparison of secondary ion mass spectrometry, glow discharge mass spectrometry and thermal ionization mass spectrometry. Spectrochim Acta B 56(5), 541-549. 

Photolactonization had played a fruitful role in the synthesis of (+)-aspi-cillin (100) because it had been possible to introduce the functional O group at C(6) and, to take measures well-adapted for the future, the C(4)=C(5) and C(2)=C(3) bonds at the same time as the skeleton was being formed. Would it also prove its worth in the synthesis of the antibiotic A 26771 B (101), in which it would be necessary to remove the 0-function at C(6), resulting unavoidably from Wessely oxidation Comparison of Schemes 57 and 58 shows how the strategy used for the photochemical synthesis of 100 was also retained for the photochemical synthesis of 101. 

Harriman A, Richoux MC, Christensen PA, Mosseri S, Neta P (1987) Redox reactions with colloidal metal oxides. Comparison of radiation-generated and chemically generated Ru02 2H20. J Chem Soc Faraday Trans 1 83 3001-3014... 

Clouet, R, Niot, I. Bezard, J. (1989) Biochem. J., 263, 867-873. Pathway of a-linolenic acid through the mitochondrial outer membrane in the rat liver and influence on the rate of oxidation. Comparison with linoleio and oleic acids. 

Figure 8 shows the normalized oxidative comparison of the two different process residues. Both are of similar oxidative stability and exhibit at least a two stage combustion profile on heating at lO C/min. 

Tsuruta, T. Hasebe, Y. Stereocontrol mechanism of an organozineeomplex having ehain-type structure in the polymerization of ferf-butylethylene oxide comparison with propylene oxide. Macromol. Chem. Phys. 1994,195, 427-438. 

Figure 17.7a shows a linear increase in nanopailicle uptake with the surfactant concentration for iron, copper, and nickel oxides. Comparison between Figures 17.3 and 17.7a reveals that the trend in nanoparticle uptake is independent of whether the surfactant is reactive or nonreactive. The increase in nanoparticle uptake was coupled with an increase in the particle size. Again, the same trend was reported for the reactive surfactant case. The inCTease in particle size is attiibnted to the higher... 

Characterization of Ce02-Zr02 mixed oxides comparison of the citrate and sol-gel preparation methods. Chem. Mater., 15, 395-403. 

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