Study on the Interaction Between Ni 2+ and SO 4 2− on the Surface of ZSM-5 Catalyst and the Effect on n -Butene Oligomerization. - Xu, Xi; Liu, Guangbo; Li, Jianqing; Gao, Yurou; Gu, Suning; Wu, Jinhu (Catalysts (2073-4344), 2026)