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Steam Reforming of Oils Produced from Waste Plastics

2005; Society of Chemical Engineers, Japan; Volume: 38; Issue: 10 Linguagem: Inglês

10.1252/jcej.38.859

1881-1299

Toshiro Tsuji, Satoshi OKAJIMA, Akira Sasaki, Takao Masuda,

Catalysts for Methane Reforming

Steam reforming of oils derived from plastics has been investigated to produce gas from waste plastics. Two types of oils, from polyethylene and from polystyrene, were produced by thermal decomposition at relatively low temperatures (350–450°C). Steam reforming of these oils was conducted at temperatures from 650 to 850°C under a pressure of 1 atm using three types of Ni-Al2O3 catalysts. Gas yield, gas composition, carbon conversion, and the coking ratio for these catalysts were measured. Although the plastic-derived oils contain heavy hydrocarbons or aromatics, they are gasified well with a low coking rate at temperatures above 800°C and a steam carbon ratio = 3.5 and LHSV = 1 h–1. Among the three catalysts, C11NK, which is a commercial steam reforming catalyst for naphtha, possessed moderate activity, but had the lowest rate of coking. Gas compositions agreed well with values calculated from chemical equilibria. Product gas contained approximately 72 vol% hydrogen for polyethylene-derived oil and 68 vol% for polystyrene-derived oil.