@article{costa_santos_silva_barros neto_pereira_freitas_2021,  title={Microstructure and morphology of mechanically sulfated acid catalysts of α-Al<sub>2</sub>O<sub>3</sub>},  volume={67},  ISSN={0366-6913},  url={https://doi.org/10.1590/0366-69132021673833017},  DOI={10.1590/0366-69132021673833017},  number={383},  journal={Cerâmica},  publisher={Associação Brasileira de Cerâmica},  author={Costa, T. K. Oliveira and Santos, S. B. F. and Silva, C. B. and Barros Neto, E. L. de and Pereira, C. G. and Freitas, N. L. de},  year={2021},  month={Jul},  pages={308–315} }