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educt concentrations, were varied to arrive at the kinetic regime. The commercial 0.9-wt%
Au/γ-Al2O3(Aurolite TM)catalystwasusedtoestablishthemass transferregime.Thestirring
ratewas fixedat1000rpmandtheamountofcatalystvariedasshowninFigure3. In theory,
if the rate doubles with the doubling of the weight of the catalyst, then the reaction is
controlledbykinetics; if this is not the case, then the reaction is controlledbymass transfer.
The curve in Figure 3 indicates that, under the defined experimental conditions, the ideal
amount of catalyst necessary to achieve kinetic control was between 0.5 and 1.2 g. This
‘reaction-limited’ situation was ideal for the determination of intrinsic reaction kinetic
parameters.
3.2.3.The effect of temperature onactivation energy
In thiswork, theactivationenergy for theoxidationof glycerol overAu/γ-Al2O3 catalystwas
experimentallydetermined. For a zero-order reaction, it canbe shown that fractional conver-
sion is linearlydependenton timeandtemperature throughtherelationshipsshowninEq. (1)
andEq. (2):
XA¼ kCAo � t (1)
whereXA is the fractional conversionof reactantA,
Figure2. Theeffect ofbase concentrationasa reaction initiatoronglyceroloxidationusing0.5gof0.9-wt%Au/γ-Al2O3
catalystat90�CandO2pressureof8.5bar.
Advanced Chemical
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Buch Advanced Chemical Kinetics"
Advanced Chemical Kinetics
- Titel
- Advanced Chemical Kinetics
- Autor
- Muhammad Akhyar Farrukh
- Herausgeber
- InTech
- Ort
- Rijeka
- Datum
- 2018
- Sprache
- englisch
- Lizenz
- CC BY 4.0
- ISBN
- 978-953-51-3816-7
- Abmessungen
- 18.0 x 26.0 cm
- Seiten
- 226
- Schlagwörter
- Engineering and Technology, Chemistry, Physical Chemistry, Chemical Kinetics
- Kategorien
- Naturwissenschaften Chemie