Simultaneous recovery of H2-rich syngas and removal of HCN during pyrolytic recycling of polyurethane by Ni/Mg/Al catalysts
Simultaneous recovery of H2-rich syngas and removal of HCN during pyrolytic recycling of polyurethane by Ni/Mg/Al catalysts
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DOI：
10.1016/j.cej.2018.12.099
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发表时间：
2019-04
影响因子：
15.1
通讯作者：
S. Kumagai;R. Yabuki;T. Kameda;Yuko Saito;T. Yoshioka
中科院分区：
文献类型：
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作者：
S. Kumagai;R. Yabuki;T. Kameda;Yuko Saito;T. Yoshioka
聚氨酯（pu），如柔性（缓冲材料和海绵）和刚性（不同的绝缘体）形式和弹性体（柔性管和智能手机外壳）在500 °C下热分解。将无用的分解产物转化为富h2合成气，在800 ℃、50 vol%蒸汽/He流量条件下，采用Ni/Mg/Al催化剂脱除其中有毒的HCN。所得总产气量为1411-1623 mL/g (H2: 794-967 mL/g)，几乎是不产h2u的简单裂解法的30倍。同时，产物气中HCN浓度从2.8 vol%的最大值急剧下降到0.2-0.6 vol%。催化剂中Ni、Mg和Al的协同作用是催化剂去除HCN和提高富h2合成气产量的主要原因。这种方法对处理各种不能有效回收的PU废物有很大的希望。
Polyurethanes (PUs) such as flexible (cushioning material and sponge) and rigid (different insulators) forms and elastomers (flexible tube and smartphone case) were thermally decomposed at 500 °C. The useless decomposition products were converted into H2-rich syngas and the toxic HCN in it was removed by Ni/Mg/Al catalysts at 800 °C under 50 vol% steam/He flow. The resultant total gas production was 1411–1623 mL/g (H2: 794–967 mL/g), which was almost 30 times larger than that obtained from simple pyrolysis of PUs where no H2was produced. Meanwhile, there was a drastic reduction of HCN concentration in the product gas from a maximum at 2.8 to 0.2–0.6 vol%. The excellent performance on the removal of HCN and the enhanced H2-rich syngas production is due to the synergy between Ni, Mg, and Al in the catalysts. This approach has great promise for treating a variety of PU wastes that cannot be recycled effectively otherwise.