Structure-reactivity relationships in MoO3-based catalysts for hydrodeoxygenation of lignin pyrolysis products

用于木质素热解产物加氢脱氧的 MoO3 基催化剂的结构-反应性关系

• 批准号: 442613239
• 负责人: Privatdozent Dr. Ali Abdel-Mageed, Ph.D., since 2/2022
• 金额: --
• 依托单位: Leibniz-Institut für Katalyse e. V. an der Universität Rostock (LIKAT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/442613239?language=en
• 关键词: Structure; reactivity; relationships; MoO3; based

Renewable resources not relevant for human nutrition contain lignin as main component. They are gaining more and more importance as substitutes for fossil resources. Pyrolysis oil derived from lignin contains 20-40% of bound oxygen which must be removed before further valorization. This is done by catalytic reaction with hydrogen (hydrodeoxygenation, HDO), which in general is performed in liquid phase after condensation of the gaseous pyrolysis products. However, their HDO in the gas phase directly after leaving the pyrolysis reactor would be much more attractive, since this would make their condensation dispensable and save costs. In contrast to liquid phase HDO, there is much less research on HDO in the gas phase. Such investigations shall be performed in this project using lignin-relevant model substrates with differently bound oxygen (e. g. phenol, anisole, Guaiacol) and catalysts based on molybdenum oxide. We are following an integrated approach comprising synthesis of differently purposefully doped MoO3 catalysts, catalytic testing including optimization of reaction conditions as well as comprehensive spectroscopic in situ/operando studies to derive reaction pathways. It is the main aim of this project to elucidate if and how activity and selectivity (e. g. maintaining aromatic bonds, preventing liberation of methane) as well as stability (e. g. resistance against coke deposition) in gas phase HDO of lignin-relevant model substrates can be controlled through modification of redox and acid-base properties of MoO3 catalysts by doping with second metal ions of different valence state and reducibility.

与人类营养无关的可再生资源含有木质素作为主要成分。它们作为化石资源的替代品越来越重要。来自木质素的热解油含有20-40%的结合氧，其必须在进一步稳定之前除去。这通过与氢气的催化反应（加氢脱氧，HDO）来完成，其通常在气态热解产物冷凝后在液相中进行。然而，离开热解反应器后直接呈气相的HDO将更具吸引力，因为这将使它们的冷凝可有可无并节省成本。与液相HDO相比，气相HDO的研究相对较少。在本项目中，应使用具有不同结合氧的木质素相关模型基质（例如：G.苯酚、苯甲醚、愈创木酚）和基于氧化钼的催化剂。我们遵循一种综合方法，包括合成不同目的掺杂的MoO 3催化剂，催化测试，包括优化反应条件以及全面的光谱原位/操作研究，以获得反应途径。本项目的主要目的是阐明活性和选择性（e. G.保持芳族键，防止甲烷的释放）以及稳定性（例如，G.抗焦炭沉积）可以通过用不同价态和还原性的第二金属离子掺杂来改变MoO 3催化剂的氧化还原和酸碱性质来控制。