Development of solid heteropolyacids for tandem reactions along the hemicellulose value chain

在气候变化和化石资源日益减少的时代，使用生物质等可再生碳源是不可避免的。为了实现高选择性的必要转化，需要实现酸催化水合/脱水和金属催化加氢/脱氢的串联反应。这样，不稳定的中间体可以直接转化为更稳定的产物，并且可以避免副反应。例如，这适用于从木聚糖生产糖醇，从木糖生产糠醇或从甘油生产1,2-丙二醇。本研究项目将在半纤维素价值链的串联反应中开发、优化和测试由固体金属催化剂和固体酸催化剂组成的催化剂体系。重点在于发展异质化策略的杂多酸，这是特别适合作为催化剂的研究反应。由于此类固定化催化剂的稳定性通常较低，因此将在反应前后对合成的材料进行详细表征，以了解失活机理。随后，可以调整合成策略以形成具有竞争力的催化剂体系。

In times of climate change and diminishing fossil resources, the use of renewable carbon sources such as biomass is inevitable. In order to realize the necessary transformations with high selectivity, the implementation of tandem reactions is necessary, which combine acid catalyzed hydration/dehydration and metal catalyzed hydrogenation/dehydrogenation. In this way, unstable intermediates can be directly converted to more stable products and side-reactions can be avoided. This applies, for example, to the production of sugar alcohols from xylan, of furfurylalcohol from xylose or the production of 1,2-propanediol from glycerol. In the research project, a catalyst system consisting of a solid metal catalyst and a solid acid catalyst shall be developed, optimized and tested in tandem reactions along the hemicellulose value chain. The focus lies on the development of heterogenisation strategies for heteropolyacids, which are particularly well suited as catalysts for the investigated reactions. Since the stability of such immobilized catalysts is often low, the synthesized materials will be characterised in detail before and after the reaction to understand deactivation mechanisms. Subsequently, the synthesis strategy can be adapted to come to a competitive catalyst system.