Ca, se co-doped polyheptazine imide photocatalyst, preparation method and application thereof

By using Ca and Se co-doped polyheptaquinone imide photocatalyst, the problems of underutilization of photogenerated carriers and low conversion efficiency of low-concentration CO2 were solved, achieving efficient coupled catalysis of CO2 to CH4 and ethylene glycol to glycolic acid, thus improving photocatalytic performance and product selectivity.

CN121402143BActive Publication Date: 2026-07-03HEBEI UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEBEI UNIVERSITY
Filing Date
2025-12-04
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In existing photocatalytic technologies, the redox capacity of photogenerated carriers is not fully utilized, the efficiency of catalytic conversion of low-concentration CO2 to CH4 is not high, and PHI materials have problems such as limited visible light absorption range, insufficient CO2 adsorption capacity, and rapid recombination of photogenerated carriers.

Method used

A Ca and Se co-doped polyheptaquinone imide photocatalyst was used. The synergistic effect of Ca and Se promoted the separation and utilization of photogenerated charges, broadened the photoresponse range and accelerated charge transfer, and constructed a highly efficient coupled reaction system for CO2 to CH4 reduction and ethylene glycol to glycolic acid oxidation.

Benefits of technology

High space-time yield (39.2 μmol/g/h) and high selectivity (92.5%) of low-concentration CO2 to CH4, and high space-time yield (179.3 μmol/g/h) of ethylene glycol to glycolic acid were achieved, improving the energy utilization efficiency and product selectivity of the photocatalyst.

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Abstract

This invention belongs to the field of photocatalytic materials technology, specifically relating to a Ca / Se co-doped PHI photocatalyst, its preparation method, and its application. In the photocatalyst disclosed in this invention, Ca and Se are atomically dispersed on the surface of polyheptaquinoneimide. Ca forms Ca-N coordination bonds with N atoms on the PHI surface. Se doping modulates the band structure, broadens the photoresponse range, and accelerates the transfer of photogenerated charges. The synergistic effect of Ca and Se promotes the separation and utilization of photogenerated charges, enhancing the photocatalytic performance of PHI. This photocatalyst can be used for the highly efficient coupling reaction of catalytic CO2 reduction to CH4 and catalytic ethylene glycol oxidation to glycolic acid. It not only exhibits high yield and high product selectivity for the catalytic reduction of low-concentration CO2 to CH4, but also high yield for the catalytic oxidation of ethylene glycol to glycolic acid, thereby achieving dual value-added of CH4 and glycolic acid.
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