Coal gangue-supported catalyst for the efficient conversion of waste plastics into hydrogen and carbon nanotubes.

From an economic and environmental perspective, pyrolysis-catalysis is a promising method for converting waste plastics into high-value products. Low-cost catalysts are crucial for the large-scale processing of waste plastics. This study prepared a nickel-based catalyst supported on solid waste coal gangue (CG) using a simple impregnation method and investigated the effect of catalyst composition on the catalytic pyrolysis of polyethylene to produce hydrogen and high-value carbon nanotubes (CNTs).