研究目的
To synthesize a novel organic-inorganic hybrid supramolecular complex based on Keggin building blocks and investigate its crystal structure, photochromic properties, and catalytic performance in the degradation of methanol.
研究成果
The synthesized complex exhibits a stable Keggin structure with high thermal stability, strong oxidizability, blue fluorescence, and irreversible photochromism. It demonstrates good catalytic activity for methanol degradation, with an elimination rate of 76% under optimized conditions, outperforming the parent heteropolyacid. This adds to the chemical library and provides a basis for developing new catalytic materials.
研究不足
The photochromic behavior is irreversible, and the catalytic performance was tested only for methanol degradation under specific conditions, which may limit generalizability to other VOCs or reaction setups. The role of CoSO4 as a template agent is not fully understood.
1：Experimental Design and Method Selection:
The study employed solvothermal synthesis to create the complex, followed by characterization using single-crystal X-ray diffraction, IR spectroscopy, TG-DTA, cyclic voltammetry, fluorescence spectroscopy, and catalytic testing via solid-gas heterogeneous catalysis. Theoretical models include the Keggin structure and hydrogen bonding for supramolecular assembly.
2：Sample Selection and Data Sources:
The complex was synthesized from commercial chemicals including Na2MoO4·2H2O, Na2SiO3·9H2O, CoSO4·7H2O, and DMF. Catalytic tests used gaseous methanol as the substrate.
3：List of Experimental Equipment and Materials:
Equipment includes Bruker Smart Apex II CCD area detector single-crystal diffractometer, WCT-1D TG-DTA instrument, FT-IR spectrophotometer, CS300 electrochemical workstation, F-4500 fluorescence spectrophotometer, and GC-102M gas chromatograph. Materials include various chemicals for synthesis and catalysis.
4：Experimental Procedures and Operational Workflow:
Synthesis involved dissolving and stirring chemicals, adjusting pH, heating in a Teflon-lined bomb, and slow evaporation. Characterization methods were applied as per standard procedures. Catalytic experiments used a fixed-bed microreactor with controlled flow rates and temperatures.
5：Data Analysis Methods:
Data analysis included structural refinement with SHELX programs, interpretation of spectral data, and calculation of elimination rates using gas chromatography results.
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