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Influence of Bimetallic Catalysts on Hydrogen Yield and H2:CO Syngas Ratio From the Pyrolysis-Catalytic Steam Reforming of Polypropylene
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DOI：10.1002/ente.70573.png)
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Abstract
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Pyrolysis-catalytic steam reforming of polypropylene has been investigated using bimetallic-alumina catalysts to determine the influence on hydrogen yield, H2:CO syngas ratio, and catalyst coke formation. The presence of different metals coupled with nickel significantly influences the reforming process, for example, producing high hydrogen yield (>100 mmol g−1plastic), defined H2:CO ratio (between 1.96 and 3.41), or heavy catalyst coking. For example, the Ni-Cu/Al2O3 catalyst produced a H2 yield of 99.13 mmol g−1plastic, H2:CO ratio of 3.41, but with high catalyst coke deposition of 15.76 wt%. Whereas, the Ni-Mg/Al2O3 catalyst gave a H2 yield of 92.19 mmol g−1plastic, H2:CO ratio of 2.56, and moderate coke deposition of 6.60 wt%. The Ni-Mn/Al2O3 and Ni-Mo/Al2O3 catalysts gave hydrogen yields of 87.55 and 82.26 mmol g−1plastic, respectively. Bimetallic catalysts containing no Ni, such as Fe-Co/Al2O3, and Co-Cu/Al2O3, showed reduced H2 yield and H2:CO syngas ratio. The results highlight the critical role of active metal choice and loading in maximising hydrogen production and minimising catalyst coking. Nickel remains the most effective reforming metal, while carefully designed bimetallic catalysts, particularly those containing Co, Mo, or Mg, offer targeted gains in hydrogen selectivity, targeted H2:CO ratio, or catalyst coke resistance.
Keywords:
catalysis
hydrogen
syngas
waste plastic
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