TY - JOUR
T1 - Reinforced catalytic oxidation of polyoxometalate@charge transfer complex by on-site heating from photothermal conversion
AU - Chen, Xiaofei
AU - Yang, Aibing
AU - Wang, Gengxin
AU - Wei, Mingfeng
AU - Liu, Ning
AU - Li, Bao
AU - Wu, Lixin
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10/15
Y1 - 2022/10/15
N2 - Near infrared (NIR) absorption at low energy region has been demonstrated to devoted to photothermal conversion efficiently. This process provides a possibility for valuable extension in emerging photothermal catalysis following a specific approach of molecular composition. To exploit novel photothermal materials in increasing the catalytic activity of comment catalysts, a typical yet unnoticed charge transfer (CT) complex of 3,3′,5,5′-tetramethylbenzidine (TMBCT) is used here as an on-site heater. Through the electrostatic complexation of cationic CT complex bearing strong NIR absorption with series polyanionic clusters, composite catalysts are prepared. These nano-assembled catalysts in size of 5–10 nm display integrated NIR photothermal effect and highly enhanced catalysis for the mild oxidation of toluene and its derivatives into corresponding alcohols with high conversion and selection. While NIR photothermal stability of TMBCT is maintained, the catalytic activity of inorganic clusters is largely improved. The increments in conversion unattainable under external heating condition are realized and the extension to the mild oxidation of thioethers and olefins into sulfoxides and epoxides with acceptable catalytic recyclability and structural stability are demonstrated. All results from the detailed characterizations figure out the applicability of the NIR photothermal conversion to the catalytic reactions with similar catalytic centers.
AB - Near infrared (NIR) absorption at low energy region has been demonstrated to devoted to photothermal conversion efficiently. This process provides a possibility for valuable extension in emerging photothermal catalysis following a specific approach of molecular composition. To exploit novel photothermal materials in increasing the catalytic activity of comment catalysts, a typical yet unnoticed charge transfer (CT) complex of 3,3′,5,5′-tetramethylbenzidine (TMBCT) is used here as an on-site heater. Through the electrostatic complexation of cationic CT complex bearing strong NIR absorption with series polyanionic clusters, composite catalysts are prepared. These nano-assembled catalysts in size of 5–10 nm display integrated NIR photothermal effect and highly enhanced catalysis for the mild oxidation of toluene and its derivatives into corresponding alcohols with high conversion and selection. While NIR photothermal stability of TMBCT is maintained, the catalytic activity of inorganic clusters is largely improved. The increments in conversion unattainable under external heating condition are realized and the extension to the mild oxidation of thioethers and olefins into sulfoxides and epoxides with acceptable catalytic recyclability and structural stability are demonstrated. All results from the detailed characterizations figure out the applicability of the NIR photothermal conversion to the catalytic reactions with similar catalytic centers.
KW - Charge transfer complex
KW - Mild oxidation
KW - Near infrared radiation
KW - Photothermal catalysis
KW - Polyoxometalates
UR - http://www.scopus.com/inward/record.url?scp=85131038646&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.137134
DO - 10.1016/j.cej.2022.137134
M3 - Article
AN - SCOPUS:85131038646
SN - 1385-8947
VL - 446
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 137134
ER -