Activities of various oxides

TABLE Catalytic Activity of Various Oxides on the Oxidation of Different Polymers ... 

For this reaction the comparison of activity of various oxides cannot be carried out because most of them transform in reaction conditions into nonactive sulfates. The exception is vanadium pentoxide whose activity strongly increases when promoted by sulfates of alkali metals. As is clear from Fig. 15, the catalytic activity of vanadium catalysts, with the addition of different sulfates of alkali metals, changes identically in reactions of isotopic exchange in molecular oxygen and in the oxidation of sulfur dioxide. 

In this work, we investigate the preparation of copper-oxide catalyst system for hydrogenation, particularly CO hydrogenation for methanol production. We report the relations between the condition and morphology of the catalyst originated from the preparation condition of the catalyst and the catalytic activity for CO hydrogenation as well as the catalytic activity of various oxide contained copper. 

Figure 25 shows the specific activities of various oxides plotted versus 1031T. The accessible surface area, if not given by the authors, has been estimated from experience gained with catalysts of the same composition and mode of preparation. 

Recent developments in the theory of electronic structure of solids and more extensive data on the mechanism of physical phenomena in the solid phase revealed a relationship between coloration in the visible and the electronic structure of the solid. Elovich et al. (63) investigated the catalytic activities of various oxides with respect to high con-... 

Table I. Relative Hydrocarbon Oxidation Activities of Various Oxides...

The centres responsible for the activity of various oxides in CTR using aliphatic alcohol as hydrogen donor are usually of basic character. Acidic centres are mainly responsible for the undesired consecutive dehydration. 

The electrochemical catalytic activity of various Pt-porous nanoparticles for the oxidation of methanol was shown in Figure 13. The peak mass current densities recorded after 100 scan cycles were 80mAmg Pt for those porous Pt nanoparticles. The peak mass current densities were 72, 62, 58 and 51mAmg Pt for those products formed for reaction time of 3, 5, 10, and 20min at the Pt(acac)2 HDD HDA ACA DPE molar ratio of 6 36 118 12 100, respectively. As a reference point, the catalytic activity of a commercial carbon-supported Pt... 

Yang, Z. Kitano, Y. Chiha, K. Shibata, N. Kurokawa, H. Doi, Y. Arakawa, Y. Tada, M. Synthesis of variously oxidized abietane diterpenes and their antibacterial activities against MRS A and VRE. Bioorg. Med. Chem. 2001, 9, 347-356. 

The aim of this contribution is to provide a molecular insight through density functional theory modeling corroborated with spectroscopic investigations (both in static and flow regimes) into the binding and activation of nitrogen oxides on various TMIs of different... 

The last phase of the excitotoxic cascade involves the activation of various biochemical pathways, among which phospholipases, proteases (in particular cal-pain), kinases and calmodulin-regulated enzymes such as nitric oxide synthase (NOS) play a prominent role. 

Olas and Wachowicz (2002) investigated the effects of tranx-resveratrol and vitamin C on oxidative stress in blood platelets. The level of 02 in control blood platelets and platelets incubated with resveratrol or vitamin C was recorded using a chemiluminescence method. On the other hand, Oh and others (2006) reported the x02 quenching activities of various freshly squeezed fruit and vegetable juices by measuring their inhibitory effects on the rubrene oxidation induced by x02 from disproportionation of hydrogen peroxide by sodium molybdate in a microemulsion system. 

NADPH might be considered as an indirect antioxidant due to its function as the reductant of various oxidized substrates, for example in the re-reduction of GSSG into GSH. However, it has recently been shown [1] that NADPH possesses the free radical scavenging activity reacting with such free radicals as CO/, N02 ROO and R0 . It should be noted that the efficiency of NADPH may increase under in vivo conditions due to its regeneration by numerous enzymes. 

The autoxidation of 3,5-di-terf-butylcatechol (H2DTBC) was frequently used to test the catalytic activity of various metal complexes. Speier studied the reaction with [Cu(PY)Cl] (PY = pyridine) in CH2C12 and CHCI3, and reported second-, first- and zeroth-order dependence with respect to Cu(I), 02 and substrate concentrations, respectively (41). The results are consistent with a kinetic model in which the rate determining oxidation of Cu(I) is followed by fast reduction of Cu(II) by H2DTBC. 

The capability to monitor gene-regulated responses is essential to identify the various steps that lead from the perception of elicitors to their activation of the oxidative burst machinery for defense induction. Powerful genomic approaches have now become available for the main algal models mentioned in this chapter and have allowed investigators to mine putative defense genes. 

The quantitative significance of such a superficial comparison of catalytic activities of different materials is probably very limited, and considerable caution should be exercised in interpreting the results. Different procedures and pretreatments were employed in the preparation of the various oxides tested, and it is not known to what extent these influence the resulting catalytic activities. As far as the apparent pattern is concerned, there is no obvious correlation between the catalytic activities of these oxides and their semiconducting properties. On the other hand, the... 

Related alkylrhenium(VI) complexes can be transformed to the same active species [MeRe0(02)2 H20] in the presence of hydrogen peroxide and therefore can also serve as catalysts. A comparison of the catalytic activity of various rhenium compounds is given in Reference 345. Because of its great oxidation activity, MTO can be used at room temperature and below. Although MTO is more active in the absence of bases like... 

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