The Effect of Oxygen Pressure

Regions of Homogeneity of Non-stoichiometric Oxides in the Surface interaction Layers and the Effect of Oxygen Pressure on their Range of Stabiiity... 

A. Muan, The Effect of Oxygen Pressure on Phase Relations in Oxide Systems, Am. J. Sci, 256, 171-207 (1958). 

BaTi03 the effects of oxygen pressure One of the most important features of oxide semiconductors is the effect on their behaviour of the external oxygen pressure. This has only been examined at high temperatures because the... 

The effect of oxygen pressure on the solubihties of siderophile elements in silicate melt has been understood for many years due to metallurgical interest, and has been known to the geological community since early work of Newsom and Drake (1982, 1983) on tungsten and phosphorus. Although there was a brief exploration of the possibility of zero valence dissolution of nickel and possibly cobalt at low /o (Colson, 1992 ... 

Stadie, W. C., and Haugaard, N., Oxygen poisoning. V. The effect of oxygen pressure upon enzymes succinic dehydrogenase and cytochrome oxidase. J. Biol. Chem. 161, 153-174 (1945). 

Salman A et al. (1998) The Effect of Oxygen Pressure, Temperature and Manufacturing Processes on Laboratory Degradation of Polypropylene Geosynthetics. In Rowe RK (ed) Conference Proceedings of the Sixth International Conference on Geosynthetics. Industrial Fabrics Association International (IFAI), Atlanta, USA, pp 683-690... 

Electronic and ionic components of electrical conductivity are resolved for Nd203 at 500-1000°Cby Volchenkova and Chebotin (1974). The effect of oxygen pressure is studied and the conclusion reached that the ionic conduction is due to oxygen vacancies. 

Cheema, S.A., K.A. Holbrook, GA. Oldershaw, D.P. Starkey, and R.W. Walker (1999), The effect of oxygen pressure on the tropospheric oxidation of diethyl ether, H-atom elimination from the 1-ethoxyethoxy radical, Phys. Chem. Chem. Phys., 1, 3243-3245. 

The effect of increasing pressure is to move the average hydrocarbon content towards the heavier species, but increasing temperature seems to favour the production of lighter species. The final proportions are also determined by the state of the catalyst, and the physical anangement of tire reactor. The formation of the oxygenated compounds could also involve reactions between the H2O content of tire gas in the form of adsorbed OH radicals and hydrocarbon radicals since the production of these molecules is also well beyond the thermodynamic expectation. 

Figure 2 shows the effect of ethylene pressure upon the steady-state reaction rates for clean Ag(llO) at 490 K and 150 torr O2 (25). Also shown is the steady-state coverage of atomically adsorbed oxygen... 

We have measured data similar to Fig. 2 where, instead, the effects of O2 pressure upon the steady-state rates and 6 were observed ( ). These data are plotted in Fig. 3 to directJy reflect the effects of oxygen adatom coverage upon the rates at a fixed... 

Two types of catalysts have been proposed for the CPOM reaction copper and palladium. The catalytic properties of these materials show significant discrepancies with respect to by-product formation and the effect of oxygen partial pressure. The Cu-based catalysts display high selectivity for the CPOM reaction whereas for the Pd-based catalysts CO formation is significant. 

Yund R.A. and Anderson T.P. (1978) The effect of fluid pressure on oxygen isotope exchange between feldspar and water. Geochim. Cosmochim. Acta 42, 235-239. 

Effect of Oxygen Concentration. The effect of oxygen concentration on the conversion to anthraquinone and anthracene was also determined. As the oxygen partial pressure was increased, the ratio of anthraquinone to anthracene formed increased significantly (Table V). Thus, the data indicate that higher oxygen concentrations favor anthraquinone formation. 

Therefore, the effect of partial pressure on the oxidation rate of ethylbenzene, Tetralin and p-xylene was examined carefully. However, at temperatures below 80 °C. the rate was independent of the partial pressure of oxygen at pressures of 400-760 mm. Hg. 

A. Takei, K. Nii. Effects of oxygen pressure on the oxidation behavior of Ni-20Cr alloy // Trans.Japan Inst.Metals.- 1982.- V.23, No. 12.- P.748-758. 

The effect of chamber pressure upon specific impulse at fixed expansion pressure ratio. Hydrogen/ oxygen Isp 0PT = optimum expansion for a pressure ratio of Pc/t>e = 340 Isp VAC = expansion for an area ratio of Ae/At =100 and vacuum ambient conditions. Equilibrium expansion flow. (50). 124... 

Fig. V.A. 2 Theoretical equilibrium expansion performance of hydrogen/ oxygen showing the effect of chamber pressure, Pc, on optimum mixture ratio. (50)...

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