Synergistic effect of physico-chemical properties and reaction temperature on the gasification of coal-waste activated carbon-slurry coke for H2 production

•Waste activated carbon was recycled for H2 production.•Synergistic effects of coke properties and reaction temperature were investigated.•Coke samples pyrolyzed at 400 °C and 500 °C exhibited higher gasification reactivity.•Increasing the gasification temperature is beneficial to H2 production to an extent.•Coke pyrolyzed at 500 °C showed the highest degree of disorder and carbon activity.