Benchmarking performance of equilibrium fluid catalytic cracking catalysts in the catalytic cracking of polypropylene

With the transition of the chemical industry towards renewable and recycled feedstocks, cracking catalysts are explored for a new application in converting difficult to recycle polyolefin plastics to feeds for the chemical industry. The refining industry generates large volumes of equilibrium fluid...

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Published in:Applied catalysis. B, Environmental Vol. 383; p. 126059
Main Authors: Rejman, Sebastian, Boot, Ludo, Strohm, James, van der Linden, Jeroen, Vollmer, Ina, Weckhuysen, Bert M.
Format: Journal Article
Language:English
Published: Elsevier B.V 01.04.2026
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ISSN:0926-3373
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Abstract With the transition of the chemical industry towards renewable and recycled feedstocks, cracking catalysts are explored for a new application in converting difficult to recycle polyolefin plastics to feeds for the chemical industry. The refining industry generates large volumes of equilibrium fluid catalytic cracking catalysts (ECAT) as waste materials, which might find a secondary end-of-life application as plastic cracking catalyst. Herein, we aim at establishing which ECAT materials are particularly attractive for plastic waste conversion. We screened a broad range of materials selected for both their activity and accessibility. We establish the range of activity which is achievable with this type of catalyst, placing important boundaries on process conditions. We find that an industry standard vacuum gas oil (VGO) cracking activity test, namely the fluid bed simulated test, not only predicts plastic cracking activity, but is also a very good indicator for propylene selectivity. Historical data gathered by industrial researchers might therefore prove highly useful in identifying more active and selective plastic cracking catalysts, offering concrete guidance on catalyst selection. This finding further suggests that the active sites critical for cracking of VGO are of similar importance for plastic cracking. However, we find that various characterization techniques including physisorption, contaminant analysis and determination of external acidity do not offer concrete guidance on catalyst selection. This work therefore demonstrates the limitations of routine catalyst characterization as an indicator of performance, but showcases how established activity metrics can aid in the transition of the chemical industry to recycled feedstocks. [Display omitted] •Plastic cracking activity for a broad range ECATs is benchmarked against zeolite Y.•VGO cracking activity predicts plastic cracking activity and propylene selectivity.•Historical cracking data can be used to identify promising plastic cracking catalysts.
AbstractList With the transition of the chemical industry towards renewable and recycled feedstocks, cracking catalysts are explored for a new application in converting difficult to recycle polyolefin plastics to feeds for the chemical industry. The refining industry generates large volumes of equilibrium fluid catalytic cracking catalysts (ECAT) as waste materials, which might find a secondary end-of-life application as plastic cracking catalyst. Herein, we aim at establishing which ECAT materials are particularly attractive for plastic waste conversion. We screened a broad range of materials selected for both their activity and accessibility. We establish the range of activity which is achievable with this type of catalyst, placing important boundaries on process conditions. We find that an industry standard vacuum gas oil (VGO) cracking activity test, namely the fluid bed simulated test, not only predicts plastic cracking activity, but is also a very good indicator for propylene selectivity. Historical data gathered by industrial researchers might therefore prove highly useful in identifying more active and selective plastic cracking catalysts, offering concrete guidance on catalyst selection. This finding further suggests that the active sites critical for cracking of VGO are of similar importance for plastic cracking. However, we find that various characterization techniques including physisorption, contaminant analysis and determination of external acidity do not offer concrete guidance on catalyst selection. This work therefore demonstrates the limitations of routine catalyst characterization as an indicator of performance, but showcases how established activity metrics can aid in the transition of the chemical industry to recycled feedstocks. [Display omitted] •Plastic cracking activity for a broad range ECATs is benchmarked against zeolite Y.•VGO cracking activity predicts plastic cracking activity and propylene selectivity.•Historical cracking data can be used to identify promising plastic cracking catalysts.
ArticleNumber 126059
Author Strohm, James
Weckhuysen, Bert M.
Vollmer, Ina
Rejman, Sebastian
Boot, Ludo
van der Linden, Jeroen
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Keywords Pyrolysis
Fluid catalytic cracking
Kinetics
Chemical recycling
Polypropylene
Catalytic cracking
Language English
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SubjectTerms Catalytic cracking
Chemical recycling
Fluid catalytic cracking
Kinetics
Polypropylene
Pyrolysis
Title Benchmarking performance of equilibrium fluid catalytic cracking catalysts in the catalytic cracking of polypropylene
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