Name / the 4Th Sustain 2013 Conference

name / the 4th SustaiN 2013 Conference

Fuel Production from LDPE Plastic Waste over Natural Zeolite Supported Ni, NiMo, Co and CoMo Metal

Wiwin Sriningsiha[1], Monica Garby Saerodjib, Wega Trisunaryantic

aDept. of Chemistry Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia bDept. of Chemistry Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia cPhysical Chemistry Laboratory Universitas Gadjah Mada, Bulaksumur, Yogyakarta 55281, Indonesia

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 H2 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

Table 1 GCMS data of liquid yield from hydrocracking at 350 oC over NiMo/AZ

Retension time (min) / Selectivity
(%) / Estimation of molecular structure
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

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