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Synthesis and applications of silicate containing Bi

A bismuth silicate and silicon source technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems that do not involve pure bismuth silicate, and achieve good stability of reactivity, Good matching and high catalytic efficiency

Inactive Publication Date: 2010-09-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, bismuth silicate (Bi 2 SiO 5 ) crystal is a kind of metastable substance, and there is no reference to pure bismuth silicate (Bi 2 SiO 5 ) crystal synthesis and the application of materials containing the crystal in the field of catalysis

Method used

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  • Synthesis and applications of silicate containing Bi
  • Synthesis and applications of silicate containing Bi

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5 are specific preparation methods of the bismuth silicate-containing catalytic material of the present invention.

Embodiment 6

[0019] Embodiment 6 and Embodiment 7 are application examples of the bismuth-containing silicate catalytic material of the present invention.

[0020] The comparative example is a synthesis method of the comparative catalytic material Ti-MCM-4l.

Description of drawings

[0021] Fig. 1 is gained pure powder bismuth silicate (Bi 2 SiO 5 ) powder X-ray diffraction pattern (XRD) of the sample.

[0022] When other non-amorphous carriers are used, the powder X-ray diffraction peaks of the carrier will be superimposed in the catalytic material, but the bismuth silicate (Bi 2 SiO 5 ) distribution and intensity of powder X-ray diffraction peaks.

[0023] Example 1

[0024] According to the molar ratio of silicon atoms in the silicon source to bismuth atoms in the bismuth source being 0.5:1, 1.0 mol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 5000mL of 1M sulfuric acid, and at 15°C, a mixture of 0.5mol ethyl silicate and 8.56mol ethanol was added to the abov...

Embodiment 2

[0026] According to the molar ratio of the silicon atoms in the silicon source to the bismuth atoms in the bismuth source is 5:2, 0.1mol of Bi 2 (SO 4 ) 3 Dissolve in 1300mL of 1M nitric acid, add a mixture of 0.5mol ethyl silicate and 4.28mol acetone at 15°C to the bismuth-containing nitric acid solution, and use 25% ammonia solution at 35°C Adjust the pH value to 8, stir for 10 hours, and then age at 52°C for 36 hours. The sample was taken out, washed and filtered several times, then dried and ground, and then roasted in the air at 540°C for 7 hours to obtain bismuth silicate (Bi 2 SiO 5 ) of the powdered catalytic material, which is numbered T-2, the test conditions of its XRD spectrum are the same as in Example 1, and the peak type and position of the crystal phase diagram diffraction peaks are similar to those in Fig. 1.

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Abstract

The invention relates to a synthesis method and application of silicate containing bismuth, pertaining to the catalyst technical field of materials science. While preparing powder catalysis materials containing bismuth silicate (Bi2SiO5), bismuth source is dissolved into an acidity solution to obtain bismuth solution; according to molar ratio of 25:1-0.5:1 of silicon atoms in silicon source and bismuth atoms in bismuth source, the silicon source and the bismuth source are mixed, and according to requirement, certain amount of carrier is added; the pH value of the obtained material is adjustedto 5-12; then the powder bismuth silicate (Bi2SiO5) or power catalysis material containing bismuth silicate (Bi2SiO5) can be made after the steps of stirring, aging, washing, drying, grinding and firing, wherein, the mass percentage of bismuth silicate (Bi2SiO5) is 100-5 percent; the mass percentage of carrier is 0-95 percent. The invention employs simple method to prepare catalyst material of bismuth silicate (Bi2SiO5) with good crystallinity; the catalyst material can be applied to photocatalysis and oxidation process of hydrocarbons.

Description

technical field [0001] The present invention relates to the synthesis of a bismuth-containing silicate with a special crystal structure, in particular to bismuth silicate (Bi 2 SiO 5 ) and bismuth silicate (Bi 2 SiO 5 ) preparation method of powdery catalytic material, the prepared material containing bismuth silicate can be used as a catalyst and photocatalyst for the selective oxidation of organic matter, and belongs to the technical field of material science catalyst. Background technique [0002] Bismuth silicate (Bi 2 SiO 5 ) belongs to the orthorhombic crystal system, Cmc2 1 Space group, lattice constants a=15.19A, b=5.468A, c=5.314A, Z=4 (Fei Yiting, Fan Shi. Journal of Inorganic Materials, 1997, 12: 469-476), is derived from [Bi 2 o 2 ] 2+ Layers separated by isolated [SiO 3 ] 2- The chain constitutes, that is, Bi 4 [O 4 ][Si 2 o 6 ]. Bi 2 SiO 5 Single crystals mainly have dielectric, thermoelectric and nonlinear optical properties (Fei Yiting, Fan S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01J21/16
Inventor 陈晓晖郑婧黄清明程燕魏可镁
Owner FUZHOU UNIV