Catalytic LPG Conversion Over Fe-Ga Modified ZSM-5 Zeolite Catalysts with Different Particle Sizes: Effect of Confined-Space Zeolite and External Magnetic Field

In this work, the principles of environmentally friendly and efficient resource utilization have been implemented to move towards achieving carbon neutrality. Accordingly, the confined-space molecular-sieve properties of ZSM-5 zeolite were applied in cooperation with an external magnetic field with the aim to improve the catalytic LPG conversion and the selectivity of BTX (benzene, toluene, and xylenes) over Fe-Ga/ZSM-5 zeolites (0.5 wt.% Ga and 0.1 wt.% Fe). Effect of ZSM-5 particle sizes (0.6 μm, 1.1 μm, and 22.1 μm) on BTX yields and toluene to monoaromatic hydrocarbons were examined under magnetic field at a flux intensity of 28.7 mT in North-to-South direction and compared to those without magnetic field. The highest LPG conversion over Fe-Ga/ZSM-5 catalyst was found at the ZSM-5 particle size of 1.1 µm under external magnetic field, which is 1.2 times greater than that without magnetic field. The BTX yield was also increased by factors of 1.5 compared to those without magnetic field. The outstanding performance can be attributed to the synergistic effects between the external magnetic field and limited mass transfer within the confined-space zeolite. This combination facilitates and enhances the mass transfer ability and reaction performance of the reactant molecules. Consequently, this synergistic effect can lead to the development of green and sustainable innovations for chemical and separation processes in the future. Graphical Abstract