We can use natural catalyst such as dolomite, zinc oxide, shwedaung clay, mabisan clay, bentonite clay for conversion of waste plastics to biofuel 

Dear Padmanabhan Krishnan,

Mixed plastic wastes were converted into liquid fuels. Mixed plastic wastes used were high density polyethylene (HDPE), low density polyethylene (LDPE), polystyrene (PS), polypropylene (PP) and polyethylene-terephthalate (PET). The pyrolysis processes were carried out with fixed bed reactor. Natural catalyst such as Shwedaung clay, Mabisan clay, Bentonite clay, Dolomite and synthetic catalyst, zinc oxide, were used as catalyst for pyrolysis of mixed plastic wastes.

This is find in a paper attached entitled: EFFECT OF VARIOUS CATALYSTS ON FUEL OIL PYROLYSIS PROCESS OF MIXED PLASTIC WASTES

International Journal of Advances in Engineering & Technology, Oct., 2015.

©IJAET ISSN: 22311963

Best wishes

It may be a countless number of catalysts in this process. There are the typical catalysts for the cracking process, aluminosilicates, silicates, zeolites, metals (Pt, Ni, Cu, NiW, NiMo), metal oxides, minerals with high silica content, and also cement. However, it seems that in industrial conditions initial preparation of waste plastics in technological oils is the more important, and the further decomposition in the primary reactor. I am sending our work as an attachment.

best regards, Andrzej

Hi,

Yes there are various other catalysts used successfully to convert plastic waste into liquid fuel in pyrolysis process.

You may find our recently published review article useful in this regard.

Catalytic pyrolysis of plastic waste: A review

http://www.sciencedirect.com/science/article/pii/S0957582016301082

Wish you all the best.

Rehan