Albahar, M, Li, C, Zholobenko, VL and Garforth, AA (2020) The effect of ZSM-5 zeolite crystal size on p-xylene selectivity in toluene disproportionation. Microporous and Mesoporous Materials, 302. ISSN 1387-1811

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The effect of crystal size was explored in this work aiming at enhancing p-xylene selectivity through toluene disproportionation over ZSM-5 zeolite. The different physicochemical properties of ZSM-5 were investigated using various characterization techniques including X-ray diffraction (XRD), pyridine adsorption, Fourier transform infra-red (FTIR), BET surface area by N2 adsorption, inductively coupled plasma (ICP) and scanning electron microscopy (SEM). Each catalyst was tested in a fixed bed reactor at a temperature 475 °C, weight hourly space velocity (WHSV) 3-83 h−1 and two different pressures (1 and 10 bar). ZSM-5 zeolites with crystal sizes 5, 50 and 100 μm were synthesized in house and compared with the commercially obtained ZSM-5 having a crystal size of 0.5 μm. As a result of increasing the crystal size the p-xylene selectivity was improved. This was attributed to the longer diffusion path lengths of the large crystals which imposed more diffusion constraints on the other xylene isomers. ZSM-5 zeolite with the largest crystal size 100 μm achieved the highest p-xylene selectivity (58%) at the highest WHSV 83 h−1. However, this was accompanied by a low conversion (2 wt %). The best combination of p-xylene selectivity (40%) alongside 15 wt % toluene conversion were achieved over ZSM-5 having 5 μm crystal size.

Item Type: Article
Additional Information: The final accepted manuscript and all relevant information regarding the article can be found at;
Uncontrolled Keywords: ZSM-5 zeolite; Toluene; Disproportionation; Selectivity; Para-xylene
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QE Geology
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 30 Apr 2020 14:40
Last Modified: 08 Apr 2021 01:30

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