Hydrogen from Waste Plastics by Two-Stage Pyrolysis/Low-Temperature Plasma Catalytic Processing
Hydrogen from Waste Plastics by Two-Stage Pyrolysis/Low-Temperature Plasma Catalytic Processing
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DOI：
10.1021/acs.energyfuels.0c02043
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发表时间：
2020-09-17
期刊：
影响因子：
5.3
通讯作者：
Williams, Paul T.
中科院分区：
文献类型：
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作者：
Aminu, Idris;Nahil, Mohamad A.;Williams, Paul T.
以废塑料（聚乙烯）为原料，采用一种新型的两段热解-低温等离子体催化蒸汽重整工艺制氢。聚乙烯热解生成热解气体，在低温非热等离子体（介质阻挡放电）存在下催化蒸汽重整生成氢气。在没有催化剂的情况下，增加等离子体功率导致氢产量的显著增加。在等离子体反应器放电区加入不同的催化剂（Ni/Al2O3、Fe/Al2O3、Co/Al2O3和Cu/Al2O3），在1.5 mmol g（-1）塑料时，Ni/Al2O3的氢气产率最高。采用Ni/Al2O3催化剂，研究了在不同蒸汽质量/小时空速（WHSVs）条件下等离子体催化过程中蒸汽的加入情况。水蒸气的加入促进了催化蒸汽重整反应的发生，使其产氢量显著提高，在催化剂WHSV为4 gh (-1) g（-1）时，产氢量最高，为4.56 mmol g（-1）塑料。
Hydrogen was produced from waste plastic (polyethylene) using a novel two-stage pyrolysis-low-temperature (250 degrees C) plasma catalytic steam reforming process. Pyrolysis of the polyethylene generated pyrolysis gases, which were catalytically steam-reformed in the presence of low-temperature non-thermal plasma (dielectric barrier discharge) to produce hydrogen gas. In the absence of a catalyst, increasing the plasma power resulted in a significant increase in the hydrogen yield. Different catalysts (Ni/Al2O3, Fe/Al2O3, Co/Al2O3, and Cu/Al2O3) were incorporated in the discharge region of the plasma reactor, and Ni/Al2O3 produced the highest yield of hydrogen at 1.5 mmol g(-1) plastic. The addition of steam to the plasma catalytic process was investigated at different steam weight hourly space velocities (WHSVs) using the Ni/Al2O3 catalyst. The addition of steam to promote catalytic steam reforming reactions resulted in a marked increase in the hydrogen yield, producing the highest hydrogen yield of 4.56 mmol g(-1) plastic at a WHSV of 4 g h(-1) g(-1) catalyst.