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The rate constants, k, were estimated bynon-linear regression of themodel shown inEq. (2)
against experimental data and the results summarised inTable 1, showing the apparentEA
determined fromtheestimatedrate constantsusinga two-pointArrheniusequation, thus:
EA¼T1�T2�RT2�T2 ln k2
k1 (3)
By the use of a two-pointArrhenius equationwith catalyst activity beingmeasured at 60 and
90�C, thepre-exponential factor,A,wasdetermined tobeequal to274695moldm�3h�1under
the reactionconditionsemployed. Inaddition, the kvalues for thevarious catalystsweredeter-
mined experimentally using Eq. (2). Then, since k¼274695:e�EA=RT, and in substituting the
values forAand k in theArrheniusequation, theEAper catalystwere found tobe inveryclose
proximity, with the least active catalyst (Au/γ-Al2O3) having the highest EA = 37.4 kJ mol
�1,
followedbytheAu-MoO3/γ-Al2O3withEA=35.4kJmol
�1.Therateconstants (k)of thecatalysts
for overall glycerol conversion, calculated from experimental resultswere observed to be 2.22
and1.14mol dm� 3 h� 1 for theAu-MoO3/γ-Al2O3 andAu/γ-Al2O3, respectively, per gramof
catalyst.Alternatively,whennormalised to the amount ofAu in the catalyst, the rate constants
werefoundtobe642moldm�3h�1 g�1Au forAu-MoO3/γ-Al2O3catalystand252moldm �3 h�1 g�1Au
forAu/γ-Al2O3catalyst.
Figure4. Conversionofglycerolover timeby0.9-wt%Au/γ-Al2O3 (106�150mμ) catalyst; 1000 rpm,NaOH/glycerol=2:1,
at60and90�C,underanO2pressureof8.5bar.
Advanced Chemical
Kinetics120
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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