Facile synthesis of hierarchical low-silica SAPO-34 with tunable acidity from spent FCC catalysts for the methanol-to-olefins (MTO) reaction - Wenjuan Li; Zhiwei Zhu; Hongxia Zhang; Tianjiao Qin; Dongdong Hao; Dezhi Han; Changqing Chu; Fang Wang; Jiankang Zhang; Liancheng Bing (Journal of Environmental Chemical Engineering, 2026)