Abstract A higher amount of oxygenated compounds in bio-oil obstructs its use in the existing petroleum-based infrastructures. In order to convert oxygenates into hydrocarbons and less reactive compounds, a number of catalysts have been studied in the catalytic fast pyrolysis. The ZSM-5 catalyst has drawn a considerable attention due to its potential to yield high quality bio-oil that is rich in aliphatic and aromatic hydrocarbons and deficient of oxygenating species. This review has focused on shape selectivity of ZSM-5 towards improving the quality of bio-oil from catalytic fast pyrolysis. The uniform pore size, unique channels equipped with elliptical and near-circular openings, mesoporosity, and tunable acidity are considered as the most selective for the production of aromatics and also are responsible for deoxygenation reaction. It has been revealed that pyrolysis intermediates diffuse into ZSM-5 pores and undergo catalytic cracking on the active sites while cleavage of C O and C C bonds releases oxygen and further transformation produces aromatic hydrocarbons and small molecular weight compounds. Furthermore, total acidity and the number of acid sites (Bronsted and Lewis acid) of ZSM-5 can be tuned that is promising rather than other acid catalysts for catalytic fast pyrolysis. At last, the catalytic effects of parent and modified ZSM-5 catalysts have been summarized. This review will carry the potential for the selection of catalyst with better understanding of pore size that will be a forwarding approach in the area of catalytic pyrolysis.

中文翻译：

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ZSM-5催化热解生物质制油的综述：关注结构

摘要 生物油中大量的含氧化合物阻碍了其在现有石油基础设施中的使用。为了将含氧化合物转化为碳氢化合物和反应性较低的化合物，已经在催化快速热解中研究了许多催化剂。ZSM-5 催化剂因其生产富含脂肪族和芳香族烃且缺乏氧化物质的高质量生物油的潜力而引起了相当大的关注。本综述重点关注 ZSM-5 的形状选择性，以提高催化快速热解生物油的质量。均匀的孔径、配备椭圆形和近圆形开口的独特通道、中孔性和可调酸度被认为是生产芳烃的最佳选择，也是脱氧反应的原因。研究表明，热解中间体扩散到 ZSM-5 孔隙中并在活性位点上进行催化裂解，同时 CO 和 CC 键的裂解释放氧气，进一步转化产生芳烃和小分子量化合物。此外，可以调整 ZSM-5 的总酸度和酸位点（布朗斯台德酸和路易斯酸）的数量，这比其他酸催化剂更有希望用于催化快速热解。最后总结了母体和改性ZSM-5催化剂的催化效果。这篇综述将具有选择催化剂的潜力，更好地了解孔径，这将成为催化热解领域的一种前沿方法。