| Title | Maximizing light olefins and aromatics as high value base chemicals via single step catalytic conversion of plastic waste |
|---|---|
| ID_Doc | 14449 |
| Authors | Eschenbacher, A; Varghese, RJ; Abbas-Abadi, MS; Van Geem, KM |
| Title | Maximizing light olefins and aromatics as high value base chemicals via single step catalytic conversion of plastic waste |
| Year | 2022 |
| Published | |
| Abstract | Chemical recycling of plastic waste via thermochemical processes is essential to move to a carbo-circular economy, reducing our dependence of fossil resources. However, recovering monomers from polyolefins in one or multiple steps is challenging due to their chemical inertness. In the present work, a tandem micropyrolyzer coupled to comprehensive two-dimensional gas chromatography and FID/ToF-MS detectors was utilized to study the performance of industrial formulations of steam-treated FCC catalysts and HZSM-5 additives for the in-line catalytic upgrading of polyolefin pyrolysis products towards light olefins and aromatics in two steps. When upgrading pyrolysis vapors from LDPE over the steam-treated catalysts at 600 degrees C, CH4 yields did not exceed 0.5 wt% due to their low acidity. The FCC catalyst formulations obtained higher yields of C5-C11 aliphatics (up to 42 wt%) and were more active in converting C12 + products than the HZSM-5-containing additives. The highest C2-C4 olefin selectivity of 53 wt% was obtained using a bare steam-treated HZSM-5 additive. With this catalyst, at higher catalyst loading and temperature (700 degrees C), the light olefin yield reached 69 wt% (19% ethylene, 22% propylene, 10% 1,3-butadiene, and 18% other C4 olefins). Importantly, similar yields of light olefins with even higher propylene yields of 31 wt% were obtained when processing real post-consumer mixed polyolefin waste. An adjusted loading of unsteamed catalyst (to obtain a similar level of initial conversion of C12 + products) showed higher coking propensity and deactivated more rapidly than its steam-treated version. The research results show great potential for the pyrolysis of mixed polyolefin waste followed by the direct in-line upgrading of the pyrolysis vapors to produce high value base chemicals such as C2-C4 olefins, aromatics, and naphtha-range aliphatics at high selectivity while limiting formation of coke, CH4, and H2. |
| https://biblio.ugent.be/publication/8723759/file/01H8KPSHTBN5MMW8Y17H685X3R.pdf |
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