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

• Published in: Fuel (Guildford) Vol. 327; p. 125076
• Main Authors: Wang, Jianbin, Liu, Jianzhong, Zhang, Lei, Dai, Shiliang, Li, Anan, Chen, Jian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2022
• Subjects: H2 production; Physico-chemical properties; Solid waste recycling; Steam gasification; Synergistic effect; Solid waste recycling; H2 production; Synergistic effect; Steam gasification; Physico-chemical properties
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2022.125076

[Display omitted] •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. The gasification of coal water slurry represents a promising way to recycle waste activated carbon. Here, the synergistic effects of physico-chemical properties and reaction temperature on the gasification of coal-waste activated carbon-slurry coke for H2 production were investigated. The results showed that the coke samples pyrolyzed at 600 °C and 700 °C exhibited larger crystallite sizes and lower gasification reactivity, while those pyrolyzed at 400 °C and 500 °C showed higher gasification reactivity. In addition, the coke sample pyrolyzed at 500 °C achieved the highest H2 yield of 3051 mL, at a gasification temperature of 1200 °C. Overall, increasing the gasification temperature is beneficial to H2 production to an extent, but that too high a temperature may also inhibit the reaction. The alkali and alkaline earth metal elements present in the coke samples pyrolyzed at 400 °C and 500 °C showed stronger catalytic activity towards gasification, with the sample pyrolyzed at 500 °C exhibiting the highest degree of disorder and carbon activity, as its disordered carbon lattice increases the defects in the microcrystalline structure, which facilitates contact between carbon and steam molecules.