Propane decomposition rate

Near atmospheric pressure, propane decomposition rate increases slightly with increasing total pressure. n-Butane is probably not sensitive to pressure. 

Figure 2. Arrhenius plots for propane decomposition rate in pyrolysis of propane-propylene mixtures...

Table 2. Arrhenius kinetic parameters of propane decomposition rates in pyrolysis of propane—propylene mixtures ...

The pyrolytic reforming reactor was a packed bed in a quartz tube reactor. Quartz was selected to reduce the effect of the reactor construction material on the hydrocarbon decomposition rate. ° The reactor was packed with 5.0 0.1 g of AC (Darco KB-B) or CB (BP2000) carbon-based catalyst. The reactor was heated electrically and operated at 850—950 °C, and the reactants had a residence time of 20—50 s, depending on the fuel. The reactor was tested with propane, natural gas, and gasoline as the fuels. Experiments showed that a flow of 80% hydrogen, with the remainder being methane, was produced for over 180 min of continuous operation.The carbon produced was fine particles that could be blown out... 

Calculated Rate Constants for Propane Decomposition C3HS — CjH + CHj... 

The object of the present work is to show that the double activation energy or EE model is a suitable approximation to the decomposition rate equation for propane, n-butane, and n-hexane and, by extension, other paraffins and isoparaffins. Ethane is a somewhat special case and is excluded for the present. 

Bowker et al.[12] have concluded that adsorption occurs only on [0001] face of zinc oxide and hence represents the active face. Also surface defects are reported to be present on the two polar surfaces[13,14], Akhter et al.[7] have shown that alcohols interact most strongly with zinc polar surface wherein the surface dipoles are pointing outwards. Berlowitz and Kung[6] have further shown that the decomposition rates of propan-2-ol were 3-5 times higher on zinc polar surface than 0-polar surface. Watos et al.[15] have concluded that charge of a surface zinc ion decreases as [0001] > [1010] > [0001] plane, making the latter plane most metallic. 

Product distributions resulting from the OH radical induced oxidation of the following hydrocarbons have been determined 2-methyl-propane, 2,3-dimethyl-butane, 2-methyl-butane, n-pentane, cyclohexane, methySubstituted 1-butenes, isoprene, toluene. Whenever possible, branching ratios for the self-reactions of alkylperoxy radicals and decomposition rate coefficients for alkoxyl radicals were derived. 

To clarify the relationship between these rate constants In Equations (24) and (25) and the propane-propylene ratios, the decomposition rate constant of propane or propylene was determined from the experimental data with various ratios of both components... 

Figure 4, Relationships between propane or propylene decomposition rate constant in copyrolysis at Te/f = 900 C and propane-propylene...

The dotted lines of Figure 5 show the calculated results us ng only the rate constants given in Table 4 and the dots are the observed concentrations for each component. It can be seen from this figure that the calculated values deviate from the observed values as the amount of propylene produced increases. Consequently, the numerical calculations were tried again using the interactions between propane and propylene in addition to the rate constants in Table 4. In this calculation, it was assumed that the ratios of rate constants for the stoichiometric reactions of propane decomposition (k k ) and of propylene... 

Using the experimental results of the pyrolysis of propane-propylene mixtures under the conditions of temperatures near 900 C, atmospheric pressure and hydrogen dilution, the relation between the decomposition rate constant of propane or propylene and the ratio of both reactants was obtained. It was found from the results that propylene had an inhibition effect on propane decomposition, and conversely, propane had an acceleration effect on propylene decomposition. 

C3H6, H2O Pd/SCY/Pd H" 4-fold increase in the rate of propane decomposition. During the electrochemical pumping of hydrogen, the rate of hydrogen pumped to the outer chamber over I/2F reaches values up to 0.9 [24]... 

Fig. 20. Yield of oxime aa a function of the flow rate in the mercury-photosensitized decomposition of propane, in the presence of NO. —2 mole- %NO O—25 mole-% NO.

The reactions of butane-2,3-diol by HCF in alkaline medium using Ru(III) and Ru(VI) compounds as catalysts leads to similar experimental rate equations for both the reactions. The mechanism involves the formation of a catalyst-substrate complex that yields a carbocation for Ru( VI) or a radical for Ru(III) oxidation. The role of HCF is in catalyst regeneration. The rate constants of complex decomposition and catalyst regeneration have been determined.89 A probable mechanism invoving formation of an intermediate complex has been proposed for the iridium(III)-catalysed oxidation of propane- 1,2-diol and of pentane-1,5-diol, butane-2,3-diol, and 2-methylpentane-2,4-diol with HCF.90-92 The Ru(VIII)-catalyzed oxidation some a-hydroxy acids with HCF proceeds with the formation of an intermediate complex between the hydroxy acid and Ru(VIII), which then decomposes in the rate-determining step. HCF regenerates the spent catalyst.93... 

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