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- Title
(PMo<sub>12</sub>) (HPy)<sub>3</sub> 的合成、表征及催化氧化碘离子性能.
- Authors
郭 军; 张太文; 张 丹
- Abstract
A new polyoxometalate-based organic-inorganic hybrid heterogeneous catalyst was synthesized by hydrothermal synthesis, and it was characterized by X-ray single crystal diffraction, fourier transform infrared spectroscopy(IR), thermogravimetric analysis(TG), X-ray diffraction analysis(XRD) and elemental analysis.X-ray single crystal diffraction analysis showed that the structural formula of the compound was(PMo12O40)(C5H6N)3[short for (PMo12)(HPy)3, PMo12 was PMo12O40, HPy was C5H6N], which was belonged to orthorhombic system, Cmca space group, unit cell parameters a=1.910 31(8) nm, b=1.538 22(6) nm, c=1.460 63(6) nm, α=β=γ=90°,V=4.292 0(3) nm~3, Z=4, R1=0.062 9, w R2=0.132 4.The compound was composed of three protonated pyridine rings and one classical Keggin type[PMo12O40]3-after in-situ decarboxylation of 2-picolinic acid under high temperature and high pressure, and each secondary unit was formed by electrostatic and other interactions to form one-dimensional(1D) to two-dimensional(2D) structures.Catalytic studies showed that:(PMo12)(HPy)3 in the process of catalyzing the oxidation of iodide ion to iodine element in hydrogen peroxide, the chemical reaction kinetics was approximately a first-order reaction, and the reaction rate was as high as 1.205×10-5 mol/(L·s), which was 1 839.7 times higher than that no catalyst was added.When the heterogeneous catalyst was reused for 5 times, the conversion rate was still as high as 99.96%, showing good catalytic activity and repeatability.
- Subjects
KEGGIN anions; CHEMICAL kinetics; FOURIER transform infrared spectroscopy; HETEROGENEOUS catalysts; HYDROGEN; CATALYTIC activity
- Publication
Inorganic Chemicals Industry, 2023, Vol 55, Issue 4, p125
- ISSN
1006-4990
- Publication type
Article
- DOI
10.19964/j.issn.1006-4990.2022-0382