The synergistic effect on the product distribution for the co-pyrolysis of tannery wastes

•Harmless disposal of tannery wastes by co-pyrolysis was explored.•Co-pyrolysis of tannery wastes produced much more high-quality oil and gas.•Synergistic co-pyrolysis effect was found when more tanning sludge (TS) was added.•Synergistic co-pyrolysis effect was owing to the catalytic effect of miner...

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