A kind of method for preparing supported small particle gold catalyst
A gold catalyst and supported technology, which is applied in the field of the preparation of supported small particle gold catalysts, can solve the problems of poor reaction repeatability, complex instruments, and complicated synthesis processes, and achieves narrow size distribution, small average particle size, and simple preparation process. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0021] Preparation of nano-gold catalysts by impregnation method (IM):
[0022] 2g SiO 2 The carrier powder was dispersed in 10 mL of ultrapure water, and an aqueous solution of chloroauric acid (0.01 mmol, 5 mL) was slowly added dropwise to the solution with stirring, then stirred and reacted at room temperature for 12 h, and the above suspension was filtered and washed. The obtained solid was dried overnight in an oven at 80°C, and then the dried solid was baked in a muffle furnace at 300°C for 2 hours to obtain a nano-gold catalyst with a wider size step, marked as Au / SiO 2 - IM-300 with an average particle size of 6.8 nm.
Embodiment 2
[0024] Add S element to the precursor of the supported gold catalyst prepared by impregnation method:
[0025] 2g SiO 2 The carrier powder was dispersed in 10 mL of ultrapure water, a chloroauric acid solution (0.01 mmol, 5 mL) was slowly added dropwise to the solution with stirring, and then stirred and reacted at room temperature for 12 h, and the suspension was washed by centrifugation. The resulting solid was then redispersed in 25 mL of ultrapure water. Take 9.5 mg cysteine, a compound containing mercapto groups, and ultrasonically dissolve it in 5 mL ultrapure water, add it into the above-mentioned carrier-containing solution under stirring conditions, and then stir and react at room temperature for 1 h. The above suspension was centrifuged and washed, and the centrifuged solid was dried overnight in an oven at 120°C, and then the dried solid was baked in a muffle furnace at 300°C for 2 hours to obtain a gold atom cluster catalyst with a narrower size step. Labeled Au-...
Embodiment 3
[0027] Preparation of nano-gold catalysts by deposition-precipitation method (DPM):
[0028] 2g magnesium aluminum hydrotalcite (Mg xAl-HT, x=0.3~3) The carrier powder is dispersed in 10mL of ultrapure water, and the chloroauric acid solution (0.01mmol, 5mL) is slowly added dropwise to the solution under stirring conditions, and then the pH of the solution is adjusted with 1M NaOH solution value to 9, the reaction was stirred at room temperature for 12 h, and the suspension was washed by centrifugation. Afterwards, the obtained solid was dried overnight in an oven at 80°C, and then the dried solid was baked in a 300°C muffle furnace for 2h, marked as Au / MgAl-DP-300, and the average particle size of the obtained nano-gold catalyst was 5.7nm.
PUM
| Property | Measurement | Unit |
|---|---|---|
| size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More