Ni/Nb2O5 as a noble-metal-free catalyst for the chemical upcycling of waste polyolefin plastics - Mingyue Qiu; Bowen Du; Xiao Chen; Jipeng Meng; Deng Hu; Yanbo Sun; Chi-Wing Tsang; Carol Sze Ki Lin; Christophe Len; Changhai Liang (Chemical Engineering Journal, 2025)