期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 29, 页码 16101-16108出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202104110
关键词
Aromatics; coke formation; fluid catalytic cracking; plastic recycling; polypropylene
资金
- Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC)
- NWO Gravitation program - Ministry of Education, Culture and Science of the government of the Netherlands
- European Union's Horizon 2020 research and innovation program under the Marie Skodowsk-Curie grant [801359]
Research has shown that industrial Fluid Catalytic Cracking catalyst can effectively convert polypropylene, and through separate testing, the limitations of transmission have been revealed. The equilibrium catalyst produced the same aromatic content as the fresh catalyst, but with less coke formation, likely due to reduced activity of the zeolite domains and enhanced cracking activity of the matrix.
Polypropylene (PP) makes up a large share of our plastic waste. We investigated the conversion of PP over the industrial Fluid Catalytic Cracking catalyst (FCC-cat) used to produce gasoline from crude oil fractions. We studied transport limitations arising from the larger size of polymers compared to the crude oil-based feedstock by testing the components of this catalyst separately. Infrared spectroscopy and confocal fluorescence microscopy revealed the role of the FCC matrix in aromatization, and the zeolite Y domains in coking. An equilibrium catalyst (ECAT), discarded during FCC operation as waste, produced the same aromatics content as a fresh FCC-cat, while coking decreased significantly, likely due to the reduced accessibility and activity of the zeolite domains and an enhanced cracking activity of the matrix due to metal deposits present in ECAT. This mechanistic understanding provides handles for further improving the catalyst composition towards higher aromatics selectivity.
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