Effect of Al 2 O 3 , SiO 2 and TiO 2 on molibdenum oxide supported catalyst in ethanol oxidation into acetaldehyde Husni Husin Chemical Engineering Department Engineering Faculty Syiah Kuala University Darussalam Banda Aceh Indonesia
Apr 10, 2015
Effect of Al2O3, SiO2 and TiO2 on molibdenum oxidesupported catalyst in ethanol oxidation into acetaldehyde
Husni Husin
Chemical Engineering DepartmentEngineering FacultySyiah Kuala UniversityDarussalam Banda AcehIndonesia
Introduction
IMPORT !
Acetaldehyde: intermediate productraw material: pentaeritrytol and acetic acid production
Conventional pocess: petrochemical via X < 72, Y < 95Catalyst : SilverVery Expensive metal
⎯⎯⎯ →⎯ °CAg 500,
Reaction :
CH≡CH + H2O CH2 = CHO H C2H4O P = 15 psi
CH3CH2OH + ½O2 CH3CHO + H2O
T = 300 – 575 oC , P = 1 atm
⎯⎯⎯⎯⎯⎯⎯ →⎯ −+ CSOHHg o1000700,, 422
⎯⎯⎯⎯⎯⎯⎯ →⎯ −+ CSOHHg o1000700,, 422
⎯⎯⎯ →⎯ °CAg 500,
high cost
Alternative Route
Reaction:C2H5OH+½ O2 →C2H4O+H2O
Ethanol Oxidation over MoO3 based Catalyst
-This research is objected to evaluate the Influnce of TiO2, Al2O3, SiO2 on MoO3 catalyst in ethanol oxidation into acetaldehyde
1. Viswanath (1982)Catalyst : Fe/Mo/OT = 200-320˚C
2. Mc Cabe dan Machiels (1983)- Catalyst: mangane, platinum, dan Copper
3. Filho dan Domingues (1992 )- Catalyst : Fe/Mo/O komersial - T: 180-243 0C P: atm
4. Zhang dkk (1995) :- Catalyst : MoO3 syntetis
5. Husin dkk,. (2002)- Catalyst Fe2O3.MoO3
ETHANOL
Literature Study
Catalyst and Condition ???
Catalyst Preparation
(NH4)6Mo724O2.4H2O Al2O3, TiO2, SiO2
Impregnation
Drying
Calsination
MoO3/Al2O3, TiO2, SiO2 Catalyst
Catalyst Preparation
Characterization
Catalyst Test
Reactor set up
feedinjectionthermocople
reactor
condenser
catalystbuble
soap
flowm
eter
Gas mixer
detector
Vent
Methanol
liquid Product
gas product
H2O absorberpreheater
nitro
gen
oxige
n
nitro
gencontroller
RESULT AND DICCUSSION
XRD data
Figure 3.a Diffractogram of MoO3/TiO2
x
x
t
xt
tx x tt x
0
1000
2000
3000
4000
10 20 30 40 50 60 702 Theta (degree)
Inte
nsity
(cps
)
25% MoO3/TiO2
t ttxxt
x
xtx
x
x
0
1000
2000
3000
4000
10 20 30 40 50 60 702 Theta (degree)
Inte
nsity
(cps
)
50% MoO3/TiO2
XRD data
Figure 3.b Diffractogram of MoO3/Al2O3
x
2 Theta (degree)
6000
5000
4000
3000
Intensity (cps)
2000
1000
0
50% MoO3/Al2O3x = MoO3o = Al2O3
10 20 30 40 50 60 70
x
x
xo
x
xxx
xx
xo
xo
xo
o
Intensity
2 Theta (degree)
2000
1000
0
3000
4000Intensity (cps)
5000
25% MoO3/Al2O3x = MoO3o = Al2O3
10 20 30 40 50 60 70
x
x
xx
xx
xo
xo x
oo
Intensity
6000
XRD data
Figure 3.c Diffractogram of MoO3/SiO2
10 20 30 40 50 60 70 10 20 30 40 50 60 70
6000
4000
2000
0
50% MoO3/SiO2x = MoO3s = SiO2
2 Theta (degree)
1000
5000
00
x
s x
xx
xxs
xs
s
xs
Intensity
6000
4000
2000
0
25% MoO3/SiO2x = MoO3s = SiO2
2 Theta (degree)
5000
00
1000
x
xs
s
xxx
xs
s
xs
x
Intensity
Catalytic Activity
Figure 4. Conversion, Selectivity, and yield for ethanol oxidation at different temperature over 25% MoO3/Al2O3, TiO2, and SiO2
0102030405060708090
100
125 150 175 200 225 250 275 300 325Temperature (oC)
Akt
ivita
s (X
, S, Y
) %
Konversi EtanolSelektivitas AsetaldehidaYield Asetaldehida
25 % Mo O3/Al2O3
0
20
40
60
80
100
125 150 175 200 225 250 275 300 325Temperature (oC)
Akt
ivita
s (X
, S, d
an Y
) %
Konversi EtanolSelektivitas AsetaldehidaYield Asetaldehida
25 % Mo O3/TiO2
0102030405060708090
100
125 150 175 200 225 250 275 300 325Temperature (oC)
Akt
ivita
s (X
, S, Y
) %
Konversi EtanolSelektivitas AsetaldehidaYield Asetaldehida
2 5% MoO3 /SiO2
Figure 4. Conversion, Selectivity, and yield for ethanol oxidation at different temperature over 50% MoO3/Al2O3, TiO2, and SiO2
Catalytic Activity
01 02 03 04 05 06 07 08 09 0
1 0 0
1 2 5 1 5 0 1 7 5 2 0 0 2 2 5 2 5 0 2 7 5 3 0 0 3 2 5
T em p erat ur (o C)
Akt
vita
s (X
, S, d
an Y
) %
K o n v ersi E t an o lSelek t iv it as A set aldeh idaY ield A set aldeh ida
1 0 0 % M o O 3
0102030405060708090
100
125 150 175 200 225 250 275 300 325T emperat ure (oC)
Akt
ivita
s (X
, S, Y
) %
Konversi Et anolSelekt iv it as Aset aldehidaYield Aset aldehida
5 0 % M o O3 / S iO2
0102030405060708090
100
125 15 0 175 200 225 250 275 3 00 325T em perat ure (oC)
Akt
ivita
s (X
, S, Y
) %
Konversi Et ano lSelek t iv it as Aset aldeh idaYield Aset aldeh ida
5 0 % M o O 3 / A l2 O 3
0102030405060708090
100
125 150 175 2 00 225 250 275 3 00 325
T em perat ure (oC)
Akt
ivita
s (X
, S, Y
) %
Ko nversi E t ano lSelek t iv it as Aset aldeh idaYield Aset aldeh ida
5 0 % M o O 3 / TiO 2
CONCLUSION
The catalyst that loading of 50% MoO3 has higher intensity than 25% MoO3 . Both of the conversions and selectivities of MoO3 supported catalyst as a function of molybdenum loading and support. The highest conversion was 83% for the catalyst of 50%MoO3/TiO2, while the highest selectivity of acetaldehyde was 96% for the catalyst of 25%MoO3/SiO2. The highest of acetaldehyde yield was 51% by using MoO3/TiO2
suppoerted catalyst .
Katalis Industri
• Thanks you for your attention!