Future biorefineries should valorize all components of feedstock, and that includes bark, which constitutes at least 10 wt % of the biomass. Whereas the wood part of lignocellulosic biomass is mainly composed of cellulose, hemicellulose, and lignin, bark also contains suberin and tannin, as well as higher contents of ashes and extractives. Therefore, the valorization of bark shows unique opportunities, but its fractionation is more complicated than wood. However, given that it has only a heating value, bark can be a promising feedstock to turn future biorefineries more economically competitive and sustainable. After a brief discussion on bark’s versatile composition, this perspective embraces a survey of different bark fractionation approaches to get useful products. State-of-the-art catalytic upgrading and valorization of bark to different fractions and products are presented. We hope that this perspective will inspire more researchers to consider bark and valorizing its fractions, preferably using catalysis, despite the challenges, disruptively advancing the field.

未来的生物精炼厂应该对原料的所有成分进行评估，其中包括树皮，树皮至少占生物质的 10 wt%。木质纤维素生物质的木材部分主要由纤维素、半纤维素和木质素组成，而树皮还含有木栓质和单宁，以及较高含量的灰分和提取物。因此，树皮的增值显示出独特的机会，但其分馏比木材更复杂。然而，由于树皮只有热值，它可以成为一种很有前途的原料，使未来的生物炼制厂更具经济竞争力和可持续性。在简要讨论树皮的多功能成分后，该观点包括对不同树皮分馏方法以获得有用产品的调查。介绍了最先进的催化升级和树皮增值到不同馏分和产品的方法。我们希望这一观点能够激励更多的研究人员考虑树皮并评估其成分，最好使用催化作用，尽管面临挑战，从而颠覆性地推进该领域的发展。