In situ catalytic pyrolysis of oily sludge using coal gangue char to produce naphthalene-rich oil and hydrogen-rich gas - Chenglong Liu; Yunxiang Li; Dekai Fan; Pengfei Zhu; Yang Liu; Li Chao; Chunbao Zhou; Bang Yao; Yingwen Zhang; Jianjun Dai (Chemical Engineering Journal, 2025)