However, the use of catalyst is the main cost burden for recycling of plastic wastes by pyrolysis. Reducing the
catalyst cost for small scale application in developing countries like Indonesia is very interesting challenges. Natural
zeolites which can be found in many places worldwide including Indonesia might be used as a candidate for this
purpose instead of the commercial catalysts.
A large number of papers have been published describing the pyrolysis of plastics. There are only few papers
utilizing real plastic wastes as feedstocks. Plastic wastes can be classified as industrial and municipal plastic wastes
according to their origins [4]. These groups have different qualities and properties. Industrial plastic wastes (IPW)
are those arising from the plastics manufacturing and processing industry. Municipal plastic wastes (MPW) normally
remain a part of municipal solid wastes as they are discarded and collected as household wastes. In Yogyakarta city-
Indonesia, plastic wastes contributed 9.96% to the municipal solid wastes [12].