Co-pyrolysis-catalytic steam reforming of cellulose/lignin with polyethylene/polystyrene for the production of hydrogen
Co-pyrolysis-catalytic steam reforming of cellulose/lignin with polyethylene/polystyrene for the production of hydrogen
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DOI：
10.1007/s42768-020-00047-8
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发表时间：
2020-09-01
期刊：
影响因子：
--
通讯作者：
Williams, Paul T.
中科院分区：
文献类型：
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作者：
Akubo, Kaltume;Nahil, Mohamad Anas;Williams, Paul T.
据报道，生物质生物聚合物（木质素和纤维素）与塑料废物（聚乙烯和聚苯乙烯）共热解，再加上热解气体的下游催化蒸汽重整，以生产富氢合成气。所使用的催化剂是负载在 MCM-41 上的 10 wt.% 镍。研究了温度和蒸汽流量等工艺参数的影响，以优化氢气和合成气的生产。与木质素/塑料混合物相比，纤维素/塑料混合物产生更高的氢产率。然而，将催化蒸汽重整温度从 750 摄氏度提高到 850 摄氏度对于添加木质素的影响更为明显。例如，纤维素/聚乙烯在催化剂温度为750℃时的氢产率为50.3mmolg(-1)，在催化剂温度为850℃时增加到60.0mmolg(-1)。然而，对于木质素/聚乙烯混合物，氢产率从25.0增加到50.0mmolg(-1)，代表氢产率增加了一倍。与纤维素/塑料混合物相比，木质素/塑料混合物对氢和产率的更大影响被认为是由于木质素与聚乙烯和聚苯乙烯的重叠热降解曲线所致。向催化剂反应器输入蒸汽产生了催化蒸汽重整条件并且氢气产率显着增加。与纤维素/塑料混合物相比，增加的蒸汽输入对木质素/塑料混合物的影响更大，这也与木质素和塑料的重叠热降解曲线有关。 Ni/MCM-41催化剂与Ni/Al2O3和Ni/Y沸石负载催化剂的比较表明，Ni/Al2O3催化剂产生更高的氢气和合成气产率。
Co-pyrolysis of biomass biopolymers (lignin and cellulose) with plastic wastes (polyethylene and polystyrene) coupled with downstream catalytic steam reforming of the pyrolysis gases for the production of a hydrogen-rich syngas is reported. The catalyst used was 10 wt.% nickel supported on MCM-41. The influence of the process parameters of temperature and the steam flow rate was examined to optimize hydrogen and syngas production. The cellulose/plastic mixtures produced higher hydrogen yields compared with the lignin/plastic mixtures. However, the impact of raising the catalytic steam reforming temperature from 750 to 850 degrees C was more marked for lignin addition. For example, the hydrogen yield for cellulose/polyethylene at a catalyst temperature of 750 degrees C was 50.3 mmol g(-1) and increased to 60.0 mmol g(-1) at a catalyst temperature of 850 degrees C. However, for the lignin/polyethylene mixture, the hydrogen yield increased from 25.0 to 50.0 mmol g(-1) representing a twofold increase in hydrogen yield. The greater influence on hydrogen and yield for the lignin/plastic mixtures compared to the cellulose/plastic mixtures is suggested to be due to the overlapping thermal degradation profiles of lignin and the polyethylene and polystyrene. The input of steam to the catalyst reactor produced catalytic steam reforming conditions and a marked increase in hydrogen yield. The influence of increased steam input to the process was greater for the lignin/plastic mixtures compared to the cellulose/plastic mixtures, again linked to the overlapping thermal degradation profiles of the lignin and the plastics. A comparison of the Ni/MCM-41 catalyst with Ni/Al2O3 and Ni/Y-zeolite-supported catalysts showed that the Ni/Al2O3 catalyst gave higher yields of hydrogen and syngas.