Investigation of the Physical and Chemical Properties of Spent Zinc Catalysts and the Process of Processing with Nitric Acid. American Journal of Engineering , Mechanics and Architecture (2993-2637), [S. l.], v. 3, n. 4, p. 1–4, 2025. Disponível em: https://www.grnjournal.us.e-scholar.org/index.php/AJEMA/article/view/7299. Acesso em: 27 jan. 2026.