Schematic diagram of the research experiment process
Recently, the reporter learned from South China University of Technology that Li Xuehui's research team at the school and Shik Chi Edman Tsang, a professor at Oxford University, and He Hongyan, an associate researcher at the Institute of Process Engineering of the Chinese Academy of Sciences, have made important progress in the field of lignin selective conversion. Related research results were published in the journal "Chemistry", a sub-journal of Cell.
At present, the vast majority of carbon-containing bulk chemicals are obtained from non-renewable fossil resources such as petroleum and coal as raw materials, and are obtained through a complex conversion process. This inevitably brings a series of greenhouse effects, climate change and environmental pollution. problem. For example, maleic acid esters are an important bulk chemical. Traditional methods are produced by oxidation of petroleum-based raw materials such as benzene or butane. There are many safety and environmental problems.
Biomass resources have the characteristics of wide sources, huge output, renewable and its constituent elements are close to the current bulk organic chemicals, and their efficient conversion into platform compounds or chemicals is considered an important way to solve the above problems.
It is understood that lignin, an important component of biomass, is the most abundant renewable aromatic polymer in the world. The technology of depolymerizing lignin to produce high value-added aromatic compounds has attracted much attention. However, due to the complex structure of lignin, the yield and selectivity of its depolymerization products are low, so how to achieve the selective conversion of lignin is the key to the efficient use of lignin and biomass.
In order to break through this technical bottleneck, unlike the conventional way of depolymerizing lignin to obtain aromatic compounds, Li Xuehui's group proposed to selectively cleave the benzene ring structure of lignin and strengthen the lignin through in-situ esterification and other strengthening modes to achieve high lignin value New strategies for transformation. Subsequently, the researchers further analyzed and found that the five-coordinated Cu + structure in the copper phosphotungstate ionic liquid is the catalytic active center of the process.
In addition, the research group and its collaborators also innovatively designed a new type of microemulsion reactor system. Based on the structural characteristics of the amphiphilic lignin molecule, the self-surface active mode of action of lignin was used to achieve the effect of interface strengthening The efficient and selective depolymerization of lignin and the process of self-emulsification have demonstrated good industrial application prospects.
On this basis, the researchers further designed and constructed a series of high-efficiency selective depolymerization systems of lignin based on the analysis of the main connection methods of lignin, based on the differences in the main structural units and chemical bonds of lignin, combined with DFT calculations, etc. The selective cleavage and tailoring of lignin characteristic chemical bonds and structural units.
It is reported that the research has received funding from key projects of the National Natural Science Foundation of China. (Zhang Siwei)
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