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A kind of nano precious metal catalyst and preparation method thereof

A precious metal catalyst, precious metal technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high activity, low dispersion, and a large number of gold particles agglomeration, and achieve simple and easy operation. , good dispersion, the effect of improving the yield

Inactive Publication Date: 2011-12-07
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages: the prepared gold catalyst is easy to cause a large number of gold particles to gather during the reduction, so that the average particle size is above 20nm, the dispersion is low, and a highly active gold catalyst cannot be obtained.

Method used

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  • A kind of nano precious metal catalyst and preparation method thereof
  • A kind of nano precious metal catalyst and preparation method thereof
  • A kind of nano precious metal catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of AuTiO with 0.1% Au mass fraction 2 / MCM-41 nano gold catalyst.

[0031] Composite carrier TiO 2 The preparation of / MCM-41 is carried out in accordance with the process step 1 of composite carrier preparation; execute the process step of distilled water dilution 2: 2.0g calcined TiO 2 / MCM-41 is added to 200ml distilled water; perform the process step of ultrasonic stirring 3: ultrasonic vibration for 10 minutes; then perform the process step of distilled water secondary dilution: continue to add distilled water to dilute to about 900mL; perform process step of magnetic stirring 5: magnetic stirring for 1h, so The mixing is uniform; then the process step is performed to add precious metals 6: 0.2mL of 0.05mol / L HAuC is added in this embodiment 14 The solution is mixed for 1 hour; the process step is executed. Light irradiation 7: the mixed solution is exposed to a 15W ultraviolet lamp to react for 4 hours; the process step is post-processing 8: filtration, was...

Embodiment 2

[0035] Preparation of AgTiO with 0.1% Ag content 2 / MCM-41 nano silver catalyst.

[0036] Composite carrier TiO 2 The preparation of / MCM-41 is carried out in accordance with the process step of composite carrier preparation 1; execute the process step of distilled water dilution 2: 2.1g calcined TiO 2 / MCM-41 is added to 200ml distilled water; perform the process step of ultrasonic stirring 3: ultrasonic vibration for 10 minutes; then perform the process step of distilled water secondary dilution: continue to add distilled water to dilute to about 900mL; perform process step of magnetic stirring 5: magnetic stirring for 1h, so The mixing is uniform; then the process step is performed to add precious metals 6: In this embodiment, 0.4mL 0.05mol / L AgNO is added 3 The solution is mixed for 1h; the process step is executed. Light irradiation 7: the mixed solution is irradiated under a 15W ultraviolet lamp to react for 4h; the process step is post-processing 8: filtration, washing, and ...

Embodiment 3

[0038] Preparation of Ag / AuTiO containing Ag / Au=1∶1 (mor) 2 / MCM-41 (0.1Au wt%) composite nano gold and silver catalyst.

[0039] Method 1. The AuTiO with 0.1% Au content obtained in Example 1 of the preparation method 2 / MCM-41 nano gold catalyst product, select "Yes" when the process step is composite 9 or not, the process step returns to the process step distilled water dilution 2: 2.0g AuTiO 2 / MCM-41 (0.1Au wt%) is added to 200ml distilled water; perform process step ultrasonic stirring 3: ultrasonic vibration for 10 minutes; then perform process step distilled water secondary dilution: continue to dilute with distilled water to about 900mL; perform process step magnetic stirring 5 : Magnetic stirring for 1h to make it evenly mixed; then perform the process steps to add precious metals 6: Add 0.2mL 0.05mol / L AgNO in this embodiment 3 The solution was mixed for 1h; the process step light irradiation 7: the mixed solution was irradiated under a 15W ultraviolet lamp to react for ...

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Abstract

The invention discloses a nanometer noble metal catalyst and a preparation method thereof. The catalyst is loaded with TiO2 in a single-layer dispersed state in the channel of a mesoporous molecular sieve MCM-41 to form a composite carrier of TiO2 / MCM-41, and the noble metal is loaded on On the composite carrier; the specific surface area of ​​the composite carrier is 800-1200m2 / g; the noble metal is gold and / or silver, the particle diameter of which is not more than 10 nanometers, forming a noble metal-Ti structure with the TiO2. The preparation method is composite carrier preparation (1), distilled water dilution (2), ultrasonic stirring (3), distilled water secondary dilution (4), magnetic stirring (5), adding precious metals (6), light irradiation with ultraviolet light source ( 7), post-processing (8), compounding of optional process steps (9) and storage of finished products (10). The product of the invention has reasonable structure, high catalytic efficiency, scientific and reasonable preparation method, and is simple and easy to implement.

Description

Technical field [0001] The invention relates to a catalyst, in particular to a nano noble metal catalyst used for the oxidation of cyclohexane to prepare cyclohexanol and cyclohexanone and a preparation method thereof. Background technique [0002] The oxidation of cyclohexane to produce cyclohexanol and cyclohexanone, commonly known as KA oil, is a very important industrial reaction. The oxidation product cyclohexanone is the key intermediate of caprolactam and adipic acid for synthetic fiber nylon-6 and nylon-66 monomers. It is widely used in fiber, synthetic rubber, industrial coatings, medicine, pesticide, organic solvent and other industries. [0003] At present, there are three main industrial production processes for cyclohexanone and cyclohexanol in the world: phenol hydrogenation, cyclohexane liquid phase oxidation and cyclohexene hydration. 90% of KA oil is oxidized by cyclohexane. Method of production. In this process, the conversion of cyclohexane is mostly controlled...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/74B01J35/02B01J37/34C07C27/16C07C35/08C07C49/403B01J35/00
Inventor 周继承王亚青杨晓烽
Owner XIANGTAN UNIV