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EYE ON CHINA
New Method Boosts Syngas Generation from Biopolyols
Group from the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences proposed a new method to realize photocatalytic conversion of biopolyols to syngas at room temperature with high efficiency.

Photocatalytic biomass conversion is an ideal way of generating syngas (H2 and CO) via C-C bond cleavage, which is initiated by hydrogen abstraction of O/C-H bond. However, the lack of efficient electron-proton transfer limits its efficiency. Conversional gasification of biomass into syngas needs to be operated at high temperature (400-700 °C).

Recently, a group led by Professpr Wang Feng from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), in collaboration with Professor Wang Min from Dalian University of Technology, proposed a new method to realize photocatalytic conversion of biopolyols to syngas at room temperature with high efficiency.

This study was published in Journal of the American Chemical Society.

The researchers prepared surface sulfate ions modified CdS catalyst, which could simultaneously increase both the electron and proton transfer, thereby facilitating the generation of syngas mixture from biopolyols with high activity and selectivity.

In situ characterizations combined with theoretical calculations demonstrated that the surface sulfate ion was bifunctional, serving as the proton acceptor to promote proton transfer, and increasing the oxidation potential of the valence band to enhance electron transfer.

Compared with pristine CdS, exhibited 9-fold higher CO generation rate and 4-fold higher H2 generation. Through this method, a wide range of sugars, such as glucose, fructose, maltose, sucrose, xylose, lactose, insulin, and starch, were facilely converted into syngas.

This study reveals the pivotal effect of surface sulfate ion on electron-proton transfer in photocatalysis and provides a facile method for increasing photocatalytic efficiency.

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