Abstract Metal-induced microwave-assisted pyrolysis followed by ex-situ catalytic upgrading of vapors using a packed HZSM-5 bed was designed and investigated for the production of upgraded bio-oil from peanut shells. Effects of the pyrolysis method, catalyst bed temperature, and microwave power on both the product yield and the chemical composition of bio-oil were investigated. Results showed that compared with conventional pyrolysis, microwave-metal-assisted pyrolysis promoted the yield of aromatic hydrocarbons, which could be further enhanced by applying ex situ HZSM-5 bed. The catalyst bed temperature has a significant effect on the product yield, bio-oil chemical profile and coke deposits on catalyst. The bio-oil yield reached its maximum value (5.6 wt.%) at 600 °C, with the proportion of oxygen-free hydrocarbons of 67% and coke deposits of 0.6%. With the further increase of temperature to 700 °C, the proportion of oxygen-free hydrocarbons increased to 77%, that of coke deposits decreased to 0.5%, and that of the bio-oil yield decreased to 4.7 wt.%. Besides the catalyst bed temperature, higher microwave power led to higher bio-oil yield; however, the proportion of oxygen-free components decreased slightly owing to the reduction in contact time. Considering the outstanding performance in bio-oil deoxygenation, this work provides an important reference for bio-oil upgrading technology development.

中文翻译：

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提高生物油质量：金属诱导微波辅助热解与 HZSM-5 的异位催化升级

摘要 设计并研究了金属诱导的微波辅助热解，然后使用填充的 HZSM-5 床对蒸汽进行异位催化升级，以从花生壳生产升级的生物油。研究了热解方法、催化剂床温度和微波功率对生物油产品收率和化学成分的影响。结果表明，与常规热解相比，微波金属辅助热解提高了芳烃的产率，采用异位HZSM-5床层可以进一步提高芳烃的产率。催化剂床温对产品收率、生物油化学特征和催化剂上的焦炭沉积有显着影响。生物油产率在 600 °C 时达到最大值（5.6 wt.%），无氧碳氢化合物比例为 67%，焦炭沉积量为 0。6%。随着温度进一步升高到700℃，无氧烃的比例增加到77%，焦炭的比例下降到0.5%，生物油的收率下降到4.7%。除了催化剂床温外，较高的微波功率导致较高的生物油产率；然而，由于接触时间的减少，无氧组分的比例略有下降。考虑到在生物油脱氧方面的优异性能，该工作为生物油升级技术开发提供了重要参考。更高的微波功率导致更高的生物油产量；然而，由于接触时间的减少，无氧组分的比例略有下降。考虑到在生物油脱氧方面的优异性能，该工作为生物油升级技术开发提供了重要参考。更高的微波功率导致更高的生物油产量；然而，由于接触时间的减少，无氧组分的比例略有下降。考虑到在生物油脱氧方面的优异性能，该工作为生物油升级技术开发提供了重要参考。