Modifying effect of additives on performance of ethylene oxidation catalysts

Ostrovskii, V.E.; Koolkova, N.V.; Lopateen, V.L.; Tiomkeen, M.I.

doi:10.1016/0021-9517(62)90072-6

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“…(25) by KA(l -Oo)(l -eET -OETO) and taking into account Eqs. (21) and (22) and also (Stoukides and Vayenas, 1981) that: one obtains Equation (27) implies that for constant PET and Po, the term (Po,)lnao should be proportional to (pETo)'. Indeed, in Figure 11, where the experimental data are plotted as P&:la, vs. (pETo)', a linear dependence is observed for all temperatures examined.…”

Section: Measurement Of Surface Oxygen Activitymentioning

confidence: 92%

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Ethylene Oxidation on Silver Catalysts: Effect of Ethylene Oxide and of External Transfer Limitations

Stoukides

Pavlou

1986

Chemical Engineering Communications

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Ethylene oxidation to ethylene oxide and to carbon dioxide over silver catalysts was studied in a CSTR. The effects of two factors on the catalyst performance were examined. The first was the presence of excess ethylene oxide in the feed. A kinetic model was introduced which assumed that ethylene and ethylene oxide compete for the same sites on the catalyst surface. This model provided reasonable quantitative agreement with kinetic and potentiometric measurements. The second factor that was studied was the presence of external heat and mass transfer limitations. It was found that such limitations cause a significant decrease of the selectivity to ethylene oxide. This decrease is a result of the temperature difference between the catalyst surface and the bulk of the gas phase and of the fact that the activation energy of ethylene combustion is greater than that of ethylene epoxidation. The contribution of other factors such as inhibition by CO, or possible incomplete mixing in the reactor is shown to be insignificant.

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Section: Measurement Of Surface Oxygen Activitymentioning

confidence: 92%

“…(21) and(22) we could modify Eqs (7),(8),. and(9) as follows: Downloaded by [Columbia University] at 16:41 03 February 2015where the values of K , , K,, K,, KETo and K , are the same as those shown in Eqs.…”

mentioning

confidence: 99%

Ethylene Oxidation on Silver Catalysts: Effect of Ethylene Oxide and of External Transfer Limitations

Stoukides

Pavlou

1986

Chemical Engineering Communications

View full text Add to dashboard Buy / Rent full text

show abstract

Modifying effect of additives on performance of ethylene oxidation catalysts

Cited by 1 publication

References 0 publications

Ethylene Oxidation on Silver Catalysts: Effect of Ethylene Oxide and of External Transfer Limitations

Ethylene Oxidation on Silver Catalysts: Effect of Ethylene Oxide and of External Transfer Limitations

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