Abstract Large amounts of lignin are produced in the pulp and paper industry and are still not used in a more valuable way. Lignin has great potential as a renewable raw material for the production of biofuels and high value chemical products. The aim of the present work was to study the hydropyrolysis process of two industrial Kraft lignin types and evaluate the influence of operating temperature and the addition of two acid catalysts: a widely known commercial zeolite (ZSM-5) and niobic acid (HY-340), which has been poorly explored as a catalyst applied to biomass. HY-340, Nb2O5·nH2O, as well as commercial zeolites, has desirable acidic properties, and a low cost compared to traditional catalysts employed in catalytic pyrolysis. The composition of the vapors produced in a micropyrolyzer (CDS-5200) was analyzed in an online gas chromatograph coupled to a mass spectrometer (PY-GC/MS). The effects of operational parameters, such as reaction temperature and catalyst concentration added to lignins, were also investigated. The results showed that the use of ZSM-5 as a catalyst in hydropyrolysis reactions of both lignins promotes a significant increase in the formation of aromatic hydrocarbons. In the tests performed, the increase in selectivity for aromatic hydrocarbons reached a maximum of 98% of the area for lignin 1 and 99% for lignin 2. The addition of HY-340 in the reactions of catalytic hydropyrolysis of the industrial lignins resulted in an increase in the selectivity of open chain or aliphatic hydrocarbons, mainly n-alkanes, which reached a maximum value of 93% of area for lignin 1 and 92% for lignin 2.

中文翻译：

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使用 ZSM-5 沸石和 HY-340 铌酸催化升级工业硫酸盐木质素的快速加氢热解蒸气

摘要 纸浆和造纸工业生产了大量木质素，但仍未以更有价值的方式加以利用。木质素作为生产生物燃料和高价值化学产品的可再生原材料具有巨大潜力。本工作的目的是研究两种工业硫酸盐木质素类型的加氢热解过程，并评估操作温度和添加两种酸催化剂的影响：广为人知的商业沸石 (ZSM-5) 和铌酸 (HY-340) )，作为应用于生物质的催化剂的探索很少。与用于催化热解的传统催化剂相比，HY-340、Nb2O5·nH2O 以及商业沸石具有理想的酸性和低成本。在微热解器 (CDS-5200) 中产生的蒸汽的组成在与质谱仪 (PY-GC/MS) 联用的在线气相色谱仪中进行分析。还研究了操作参数的影响，例如反应温度和添加到木质素中的催化剂浓度。结果表明，在两种木质素的加氢热解反应中使用 ZSM-5 作为催化剂促进了芳烃形成的显着增加。在进行的测试中，芳香烃的选择性增加达到了木质素 1 的最大面积的 98% 和木质素 2 的 99%。 在工业木质素的催化加氢热解反应中加入 HY-340 导致提高开链或脂肪烃的选择性，主要是正构烷烃，