The 4th International Conference
Sustainable Future for Human Security
Kyoto, 18-21 October 2013
Fuel Production from LDPE Plastic Waste over Natural Zeolite
Supported Ni, NiMo, Co and CoMo Metal
Wiwin Sriningsiha*, Monica Garby Saerodjib, Wega Trisunaryantic
aDept.
of Chemistry Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia
Dept. of Chemistry Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia
cPhysical Chemistry Laboratory Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia
b
Abstract
According to first rough estimates published by PlasticsEurope, worldwide plastics production rose to 280 million
tonnes in 2011. Plastic waste constitutes a growing social problem, because of the loss of natural resources, the
environmental pollution, and the depletion of landfill space. Hydrocracking process can be used to address the
plastic waste. The use of catalysts would be more beneficial because it can lead to lower operating conditions of the
hydrocracking process. Natural zeolite is recently reported as good material to support metal in the preparation of
catalyst because it has a high acidity, large pore and surface area. Given the natural zeolite is very abundant and
cheap, hence its use as a catalyst is to lower the cost of production. Hydrocracking of LDPE plastic waste into fuels
over bifunctional catalysts was systematically studied. For bifunctional catalysts, activated natural zeolite was
loaded with Ni, NiMo, Co and CoMo metal to increase the activity and selectivity for hydrocracking process.
Hydrocracking reactions were carried out effectively at 350 °C with 20 mL/minutes H 2 flow rate for a reaction time
of 1 h. NiMo loaded on activated natural zeolite had the higher hydrocracking ability than did other. Conversion of
LDPE plastic waste over NiMo/Activated Natural Zeolite at 350 oC produced 11.02% of liquid yield, 87.47% of gas
yield and 1.51% of coke. According the GCMS data, liquid yield consisted of hydrocarbon compound with atom
chain of C8 until C16 that indicate the fuel chemical structure, such as paraffins, olefins and naphthenes. The gas
yield can be short-chain hydrocarbons that can used as gas fuel. The conversion of plastic waste into fuel is
expected to reduce the environmental pollution, support the use of soil, and increase the supply of energy.
© 2013 SustaiN Society
Keywords: Fuel; hydrocracking; LDPE plastic; natural zeolite
* Corresponding author. Tel.: +6285-747-141-063; fax: +62-274-51-333-9.
E-mail address: wiwin.sriningsih218@gmail.com.
Wiwin Sriningsih/ the 4th SustaiN 2013 Conference
Figure 1 The effect of temperature to conversion yield
Figure 2 The relationship between catalyst sample and conversion yield
Table 1 GCMS data of liquid yield from hydrocracking at 350 oC over NiMo/AZ
Retension
time (min)
Selectivity
3.684
1.50
2,3-dimethylhexane
4.740
8.04
2,3-dimethyl-2-heptene
4.917
23.69
2,4-dimethyl-1-heptene
5.251
1.77
1,3,5-trimethyl-yclohexane
9.357
1.28
4-methyldecane
10.549
1.59
4,4,5-trimethyl-2-hexene
11.022
3.69
3,7-dimethyl-1-octanol
11.125
3.22
1-octanol,
15.450
2.08
decyl-cyclohexane
15.747
1.33
(E)-2,2-dimethyl-3-decene
15.937
1.84
Cyclohexane
16.035
6.39
1-undecene
23.659
2.30
2-hexyl-1-decanol
(%)
Estimation of molecular
structure