Air catalytic biomass (PKS) gasification in a fixed-bed downdraft gasifier using waste bottom ash as catalyst with NARX neural network modelling. - Muhammad Shahbaz; Syed Ali Ammar Taqvi; Muddasser Inayat; Abrar Inayat; Shaharin Anwar Sulaiman; Gordon McKay; Tareq Al-Ansari (Comput. Chem. Eng., 2020)