Role of reforming agent in filamentous coke deposition on Ni/bio-char catalyst during non-oxygenates tar reforming

The filamentous coke deposition limits the application of Ni/bio-char in the tar reforming process during biomass gasification. The addition of H2O and CO2 can improve tar conversion during the gasification process, while the effect of H2O and CO2 on filamentous coke deposition during non-oxygenates tar reforming process has not been extensively explored. To reduce the filamentous coke deposition by optimizing reforming agent, this work investigated the effect of reforming agent on filamentous coke deposition on Ni/bio-char catalyst during reforming of non-oxygenates tar. During CO2 reforming process, the accumulation of filamentous coke resulted in the decline of catalyst activity. In terms of steam reforming process, the promotion effect of steam atmosphere on mesopores of Ni/bio-char contributed to improving the conversion of non-oxygenates tar. The free radicals O* from the dissociation of H2O could oxidize the filamentous coke on Ni/bio-char, which resulted in the filamentous coke deposition (38%) in steam reforming lower than CO2 reforming (57%). Overall, the addition of steam in reforming agent contributed to improving non-oxygenates tar conversion and inhibiting filamentous coke formation during the reforming of non-oxygenates tar over Ni/bio-char.

Automated summary

This study investigates the effect of reforming agent on filamentous coke deposition during the reforming of non-oxygenates tar using Ni/bio-char catalyst. It is found that the addition of steam in the reforming agent can improve the conversion of non-oxygenates tar and inhibit the formation of filamentous coke.