Abstract Biomass pyrolysis performance is improved through co-pyrolysis with hydrogen rich plastic producing more liquid fuel products of higher quality. Furthermore, beyond the synergetic effect, in catalytic pyrolysis the presence of plastic may facilitate the contact between catalyst and biomass. In this study, the effect of pretreatment of plastic/biomass was investigated, in order to further improve the above aims. The first pretreatment method was pre-degradation treatment at relatively low temperatures where solid state reactions alter the structure of plastic/biomass but no volatile products are formed. In addition, a second pretreatment method was used for the catalytic pyrolysis of cellulose, namely co-pressing of cellulose and catalyst particles into mixed pellets. Thermogravimetric results confirmed that pre-degradation treatment reduced the decomposition temperature of cellulose. Pre-degradation diminished the hindering effect of the cellulose-derived char/ catalyst-coke demonstrating significant interaction between cellulose and lldPE (linear low density polyethylene) before the charring/coking stage of cellulose. While in the absence of catalyst, there is a minimal interaction between lldPE and cellulose, as the molten lldPE layers around cellulose particles inhibited the escape of the biomass-derived volatile products, the use of catalyst along with pre-degradation provided maximum interaction between lldPE and cellulose pyrolysates which proceeded at lower reaction temperature without any hindrance from char/coke formation. Furthermore, pre-degradation treatment increased the liquid yield with associated increase in char/coke yield. The presence of lldPE during the cellulose pyrolysis decreased the concentration of char/coke on the catalyst while higher amounts of hard coke/char had accumulated on the pre-treated samples. Liquid product characterisation indicated that co-pressing of cellulose with catalyst is more effective in converting cellulose-derived products into aromatics. The results suggest that pre-treatment processes have increased the synergy between lldPE and cellulose, thereby enhancing the quantity and quality of the desired liquid product.

中文翻译：

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通过预处理强化塑料与生物质的共热解

摘要 生物质热解性能通过与富氢塑料共热解产生更多质量更高的液体燃料产品而得到改善。此外，除了协同效应之外，在催化热解中，塑料的存在可以促进催化剂和生物质之间的接触。在本研究中，研究了塑料/生物质预处理的效果，以进一步改善上述目标。第一种预处理方法是在相对较低的温度下进行预降解处理，其中固态反应会改变塑料/生物质的结构，但不会形成挥发性产物。此外，第二种预处理方法用于纤维素的催化热解，即将纤维素和催化剂颗粒共压成混合颗粒。热重结果证实预降解处理降低了纤维素的分解温度。预降解降低了纤维素衍生的炭/催化剂-焦炭的阻碍作用，证明了纤维素和 lldPE（线性低密度聚乙烯）在纤维素炭化/焦化阶段之前的显着相互作用。虽然在没有催化剂的情况下，lldPE 和纤维素之间的相互作用最小，因为纤维素颗粒周围的熔融 lldPE 层抑制了生物质衍生的挥发性产物的逸出，使用催化剂和预降解提供了 lldPE 之间的最大相互作用纤维素热解产物在较低的反应温度下进行，没有任何炭/焦炭形成的障碍。此外，预降解处理增加了液体产量，同时相应地增加了焦炭/焦炭产量。在纤维素热解过程中 lldPE 的存在降低了催化剂上焦炭/焦炭的浓度，而在预处理的样品上积累了大量的硬焦炭/焦炭。液体产品表征表明，纤维素与催化剂的共压在将纤维素衍生产品转化为芳烃方面更有效。结果表明，预处理过程增加了 lldPE 和纤维素之间的协同作用，从而提高了所需液体产品的数量和质量。液体产品表征表明，纤维素与催化剂的共压在将纤维素衍生产品转化为芳烃方面更有效。结果表明，预处理过程增加了 lldPE 和纤维素之间的协同作用，从而提高了所需液体产品的数量和质量。液体产品表征表明，纤维素与催化剂的共压在将纤维素衍生产品转化为芳烃方面更有效。结果表明，预处理过程增加了 lldPE 和纤维素之间的协同作用，从而提高了所需液体产品的数量和质量。