The influence of ZSM-5 zeolite and Red Mud in the pyrolysis of plastic wastes has been studied. Both
catalysts have been thoroughly characterized; the zeolite shows weak and strong acid sites and great
BET surface area (412.0m2 g−1), while Red Mud contains lower acidity, with also weak and strong acid
sites, meso-macropores and BET surface area of 27.49m2 g−1. Both catalysts have been tested in pyrolysis
of a mixture of plastics which resembles municipal plastic wastes, at 440 and 500 ◦C in a 3.5dm3 semibatch
reactor. The results have been compared with those of the thermal process. It has been proved that
ZSM-5 zeolite has a strong effect in the characteristics and distribution of pyrolysis products. It generates
at both temperatures a greater proportion of gases and liquids with a higher content of aromatics than
without catalyst. Red Mud needs higher temperatures than ZSM-5 zeolite to exert a catalytic effect in
pyrolysis, since similar results to those obtained without catalyst are obtained at 440 ◦C, while at 500 ◦C
a higher yield of gases and a greater proportion of aromatics in the liquids is obtained.
 
The influence of ZSM-5 zeolite and Red Mud in the pyrolysis of plastic wastes has been studied. Both
catalysts have been thoroughly characterized; the zeolite shows weak and strong acid sites and great
BET surface area (412.0m2 g−1), while Red Mud contains lower acidity, with also weak and strong acid
sites, meso-macropores and BET surface area of 27.49m2 g−1. Both catalysts have been tested in pyrolysis
of a mixture of plastics which resembles municipal plastic wastes, at 440 and 500 ◦C in a 3.5dm3 semibatch
reactor. The results have been compared with those of the thermal process. It has been proved that
ZSM-5 zeolite has a strong effect in the characteristics and distribution of pyrolysis products. It generates
at both temperatures a greater proportion of gases and liquids with a higher content of aromatics than
without catalyst. Red Mud needs higher temperatures than ZSM-5 zeolite to exert a catalytic effect in
pyrolysis, since similar results to those obtained without catalyst are obtained at 440 ◦C, while at 500 ◦C
a higher yield of gases and a greater proportion of aromatics in the liquids is obtained.
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