The ever-increasing amount of anthropogenic carbon dioxide (CO2) emissions has resulted in great environmental impacts, the heterogeneous catalysis of CO2 hydrogenation to methanol is of great significance.

With the gradual diminishing of fossil fuel reserves and growing concerns about global warming as a result of the over-dependence on fossil-based resources, finding ways of exploiting feasible pathways for the replacement of fossil-based chemicals is highly desirable.[1] To meet this growing demand, biomass and CO 2 have been regarded as "carbon-neutral" resources to produce sustainable chemicals, fuels, and materials, and these substances have garnered much attention in recent years.[2]Lignocellulosic biomass is of particular interest because such materials are the most-abundant carbon resources on the planet, and they primarily consist of a complex mixture of lignin ( % 15-30 %), hemicellulose ( % 25-30 %), and cellulose (%35-50 %).[3] The integrated pretreatment and enzymatic hydrolysis process for the conversion of cellulose and hemicellulose found in lignocellulose into monosugars for bioenergy and biochemical production through biological pathways is a recognized strategy in modern biorefinery, and lignin is produced as a byproduct of this process.[4] With the aim of establishing a cost-competitive lignocellulose-based bioeconomy, the use of every penny and the exploitation of value-added applications of the main components in lignocellulose, such as lignin, are still in high demand. [5] In our previous study, with the cheap ionic liquid dissolution pretreatment of corn stover, around 60 wt % of lignin (IEL) was extracted, and the regenerated sample presented high enzymatic hydrolytic efficiency with full conversion of carbohydrates into monosugars in less than 24 h; this process is accompanied by the production of a new enzymatic hydrolytic lignin

A Schiff base-modified silver catalyst was developed for the direct carboxylation of terminal alkynes with CO2, enabling the efficient synthesis of valuable alkynyl carboxylic acids.