Optimizing the distribution of aromatic products from catalytic fast pyrolysis of cellulose by ZSM-5 modification with boron and co-feeding of low-density polyethylene
Optimizing the distribution of aromatic products from catalytic fast pyrolysis of cellulose by ZSM-5 modification with boron and co-feeding of low-density polyethylene
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DOI：
10.1016/j.apcata.2014.09.009
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发表时间：
2014-10
影响因子：
5.5
通讯作者：
Guoqiang Zhou;Jian Li;Yanqing Yu;Xiangyu Li;Yujue Wang;Wei Wang;S. Komarneni
中科院分区：
文献类型：
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作者：
Guoqiang Zhou;Jian Li;Yanqing Yu;Xiangyu Li;Yujue Wang;Wei Wang;S. Komarneni
研究了硼浸渍ZSM-5沸石对纤维素、低密度聚乙烯及其混合物催化快速热解性能的影响。通过用不同的硼负载量（0.5-3重量%）浸渍常规ZSM-5来制备一系列硼改性的ZSM-5沸石。由于硼的沉积，ZSM-5的酸性和孔径随着硼负载量的增加而减小。当浸渍有1重量%由于ZSM-5含有硼，ZSM-5保持了足够的催化活性，用于生产有价值的单芳烃，并减少了纤维素CFP中不希望的多芳烃的形成。此外，在CFP中，硼沉积使ZSM-5的孔变窄，大大提高了对二甲苯的产量。该结果表明，稍微减小ZSM-5的孔径可以改善CFP中朝向更有价值的产物的芳族分布。在CFP中纤维素与LDPE的共进料进一步改善了产物分布。作为硼改性和共进料的结果，单芳族化合物产率从用母体ZSM-5单独的纤维素的CFP的20.0 C%增加到用硼改性的ZSM-5共进料纤维素和LDPE混合物（混合比为4：1）的CFP的24.6 C%，而多芳族化合物产率从11.3 C%降低到6.0 C%。对二甲苯的收率也从2.23 C%增加到5.57 C%，而选择性从47.9%增加到75.2%。结果表明，硼改性ZSM-5和塑料的共投料有利于改善生物质CFP中芳香族产物的分布。
This study investigated the effects of ZSM-5 impregnation with boron on its catalytic properties in catalytic fast pyrolysis (CFP) of cellulose, low-density polyethylene (LDPE), and their mixtures. A series of boron-modified ZSM-5 zeolites were prepared by impregnating a conventional ZSM-5 with different boron loadings (0.5–3 wt.%). Due to boron deposition, the acidity and pore size of ZSM-5 decreased with increasing the boron loading. When impregnated with 1 wt.% boron, ZSM-5 preserved sufficient catalytic activity for the production of valuable monoaromatic hydrocarbons and decreased the formation of undesired polyaromatic hydrocarbons in CFP of cellulose. In addition, the pore narrowing of ZSM-5 by boron deposition greatly enhancedp-xylene production overm- ando-xylenes in CFP. This result indicates that slightly decreasing the pore size of ZSM-5 can improve aromatic distribution toward more valuable products in CFP. Co-feeding of cellulose with LDPE in CFP further improved the product distribution. As a result of boron modification and co-feeding, the monoaromatic yield increased from 20.0 C% for CFP of cellulose alone with the parent ZSM-5 to 24.6 C% for co-feed CFP of cellulose and LDPE mixture (mixing ratio of 4:1) with the boron-modified ZSM-5, while the polyaromatic yield decreased from 11.3 C% to 6.0 C%. The yield forp-xylene also increased from 2.23 C% to 5.57 C% while the selectivity increased from 47.9% to 75.2%. The results indicate that ZSM-5 modification with boron and co-feeding of plastics have a beneficial effect for improving aromatic product distribution in CFP of biomass.