Effect of heterogeneous zeolite catalyst on hydrothermal liquefaction of pulp and paper mill mixed sludgeTeo Virta, Orlando Salcedo, Ekaterina Sermyagina, Rama Layek and Kristian MelinE3S Web Conf., 720 (2026) 03003DOI: https://doi.org/10.1051/e3sconf/202672003003