Catalytic Cracking of 1,3,5-Triisopropylbenzene and Low-Density Polyethylene over Hierarchical Y Zeolites and Al-SBA-15

Jim Mensah, Penghui Yan, Aditya Rawal, Adam F. Lee, Karen Wilson, Neil Robinson, Michael L. Johns, Eric Kennedy, Michael Stockenhuber

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Catalytic cracking of high molecular weight hydrocarbons underpins the production of fossil fuels from petroleum vapour and the recycling of polyolefin waste plastic. However, thermal cracking over conventional microporous solid acids is hindered by poor mass-transport. Here we explore the performance of hierarchical H−Y zeolites and Al-SBA-15 for the catalytic cracking of 1,3,5-triisopropylbenzene (1,3,5-TIPB) and low-density polyethylene (LDPE) in a continuous fixed-bed flow reactor. Dealumination by acid washing was used to create hierarchical mesoporosity in H−Y zeolite and modify the solid acidity. Physicochemical properties were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), gas adsorption, in-situ Fourier transform infrared (FTIR), ex-situ pyridine DRIFT, 29Si and 27Al nuclear magnetic resonance (NMR), and 1H relaxation and pulsed field gradient (PFG) NMR diffusion studies. Despite weakening acidity, the introduction of hierarchical porosity promotes deep cracking of both feedstocks; HNO3 dealuminated H−Y produces five times more cumene and benzene from 1,3-5-TIPB, and 33 % more benzene and xylenes from LDPE, than the parent H−Y.

Original languageEnglish
Article numbere202300884
JournalChemCatChem
Volume16
Issue number3
Early online date15 Nov 2023
DOIs
Publication statusPublished - 8 Feb 2024

Fingerprint

Dive into the research topics of 'Catalytic Cracking of 1,3,5-Triisopropylbenzene and Low-Density Polyethylene over Hierarchical Y Zeolites and Al-SBA-15'. Together they form a unique fingerprint.

Cite this