Wenpeng Hong,Yuhang Li,Haifeng Jiang,Yu Zhang,Wei Jia,Meng Song
Catalytic steam gasification is a promising route for converting plastic waste into valuable gaseous products. This work explores the heterogeneous catalytic gasification behavior of polystyrene (PS) in a two-stage fixed bed system, as well as the promotion mechanism for the generation of gaseous hydrocarbons. The obtained results indicate that adding MnCo 2 O 4 catalyst can effectively promote the formation of gaseous hydrocarbons. Further, the incorporation of Cu strengthens the above reaction process, resulting in a yield of 85.08 mmol/g for the C 1 -C 3 gaseous hydrocarbons. However, the doping of Ni has a negative effect on the generation of gaseous hydrocarbons. Moreover, an increase in the flow rate of steam within the system results in an initial rise followed by a decline in the yield of gaseous hydrocarbons. The optimal steam inflow is determined at 0.14 mL/min. The cycling test results of the catalyst show that the yield of the gaseous components of C 1 -C 3 can still be maintained at about 80 % of the initial state after five cycles. Finally, the synergistic pathway of steam and catalyst in PS gasification is elucidated. These works provide important and valuable guidance for the preparation of high-value gas-phase hydrocarbon products from waste plastics.
Botian Hao,Wei Ning,Donghai Xu,Yu Wang,Yang Guo,Shuzhong Wang
Indole is commonly reported as a N-containing heterocyclic compounds in biomass supercritical water gasification (SCWG), and is difficult to be degraded to small molecule substances. In this work, Ni/AC, Ni–Cu/AC, Ni–Co/AC, Ni–Ce/AC were prepared and tested for catalytic SCWG of indole. The results showed that Ni–Cu/AC had the highest activity for converting indole and producing gases, leading to the highest hydrogen gasification efficiency (135.1%) and carbon gasification efficiency (33.1%). During the catalytic SCWG of indole, the addition of auxiliary metal Cu in multi-component catalyst showed synergistic effects by changing reaction pathways and reaction rates. It significantly promoted water-gas shift and steam reforming reactions, so forming the highest H 2 yield of 2.62 mol mol −1 . Furthermore, large specific surface, Ni reduction and high catalyst stability point to potential advantages of the Ni–Cu/AC catalyst for catalytic SCWG of recalcitrant N-containing compounds.
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