Laying the foundation for low-cost conversion of biomass resources
The Institute of Solid State Physics of the Hefei Institute of Material Science, Chinese Academy of Sciences has made new progress in the catalytic conversion of biomass. Researchers have prepared a highly dispersed copper-based catalyst to achieve the low cost of converting biomass resources into bio-oil and chemical products. The foundation. This achievement was published in the authoritative academic journal "SMALL" in the field of international materials.
The copper-based catalyst preparation method is simple, green, and easy to enlarge, and the conversion rate and selectivity of converting lignin into high value-added chemical 2-methoxy-4-methylphenol (MMP) under different conditions are all better. High level and excellent stability.
With the increasingly severe fossil energy crisis, biomass has become a “darling†to replace fossil energy as a kind of renewable resources. However, due to its high oxygen content, it cannot directly replace fossil fuels. Hydrodeoxygenation (selective hydrogenation) is recognized as the most effective way to improve the quality of biomass fuels and to obtain high value-added chemicals. Vanillin (3-methoxy-4-hydroxybenzaldehyde), as an important aromatic monomer in lignin, has been converted into a high value-added chemical MMP with lower oxygen content, which has caused the majority of researchers. Interested in, and has carried out research work on the selective hydrogenation of vanillin. However, the active components of the hydrogenation catalyst still depend on the precious metals such as palladium, platinum, gold, rhodium, etc. Due to the low reserves and high cost of the precious metal, the large-scale application is severely restricted, so that the preparation of high-efficiency, stable and highly selective non-precious metal catalysts becomes The current hot spot of biomass energy research.
Researchers at the Center for Solid State Physics and Energy Nanomaterials use a one-step carbothermal reduction process to prepare highly dispersed copper-based catalysts. The catalyst is uniformly embedded in a carbon matrix by copper nanoparticles having a diameter of 20 to 30 nm. The researchers found that this catalyst has the best catalytic activity and selectivity in both aqueous and transfer hydrogenation processes. They carried out experiments on the catalyst. Under the condition of 120 °C and 2.0 MPa H2, the copper-based catalyst can hydrogenate vanillin to MMP in the aqueous phase with a conversion rate of 99.9% and a selectivity of 93.2%. At 180 °C Under the condition of 2.0MPa N2, the copper-based catalyst can transfer and transfer vanillin to MMP in isopropanol, and the conversion and selectivity are up to 99.8% and 99.1%, respectively, and the catalyst has excellent stability.
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