@article{ribeiro_machado júnior_costa_2013,  title={Kaolin and commercial fcc catalysts in the cracking of loads of polypropylene under refinary conditions},  volume={30},  ISSN={0104-6632},  url={https://doi.org/10.1590/S0104-66322013000400014},  DOI={10.1590/S0104-66322013000400014},  number={4},  journal={Brazilian Journal of Chemical Engineering},  publisher={Brazilian Society of Chemical Engineering},  author={Ribeiro, A. M. and Machado Júnior, H. F. and Costa, D. A.},  year={2013},  month={Oct},  pages={825–834} }