Metal-doped MFI type molecular sieve catalyst as well as preparation method and application thereof
A metal doping, molecular sieve technology, applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of high preparation cost of precious metal catalysts, limited industrial application and promotion, unstable chemical properties, etc., and is easy to popularize and use. , Wide concentration range, easy to control effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0027] combine figure 1 Shown, a kind of preparation method of metal-doped MFI type molecular sieve catalyst comprises the steps:
[0028] S1. Ball mill the silicon source and the metal source, then add lye and stir evenly to obtain a sol;
[0029] S2. Performing high-temperature crystallization on the sol to obtain an intermediate product;
[0030] S3. Washing the intermediate product until it is neutral, separating it by suction filtration, drying the solid product, and performing high-temperature calcination to obtain a metal-doped MFI molecular sieve catalyst.
[0031] In the embodiment of the present invention, the MFI molecular sieve is used as the frame structure, and the synthesis precursor is processed by mechanical grinding before synthesis, and the MFI molecular sieve catalyst with high metal doping content can be synthesized. The MFI molecular sieve catalyst with high metal doping content is suitable for use in The catalytic oxidation reaction of NO in the waste ...
Embodiment 1
[0049] This embodiment provides a method for preparing a metal-doped MFI molecular sieve catalyst, comprising the following steps:
[0050] 1) Mn 2 o 3 and fumed silicon oxide mechanical grinding pretreatment, obtained manganese silicon mixed oxide composite material, Mn / (Mn+Si) composition is 10% Mn 2 o 3 The mixture with fumed silica was ground using a planetary ball mill (Fritsch P6) equipped with a silicon nitride grinding pot at 600 rpm.
[0051] 2) Add 5 g of the ball-milled solid to 50 mL of mixed lye (NaOH, TPAOH and TEAOH) at pH = 10 and stir for 4 h. Add the stirred sol to a 100 mL reaction kettle and crystallize at 200 ° C for 12 h. The product was washed to neutrality, separated by suction filtration, and the obtained solid was dried overnight at 70°C. The obtained solid was calcined at 500°C for 24 hours to remove the template agent at a heating rate of 5°C / min to obtain metal-doped MFI molecular sieve catalyst #1.
Embodiment 2
[0053] This embodiment provides a method for preparing a metal-doped MFI molecular sieve catalyst, comprising the following steps:
[0054] 1) Mn 2 o 3 and fumed silicon oxide mechanical grinding pretreatment, obtained manganese silicon mixed oxide composite material, Mn / (Mn+Si) composition is 20% Mn 2 o 3 The mixture with fumed silica was ground using a planetary ball mill (Fritsch P6) equipped with a silicon nitride grinding pot at 600 rpm.
[0055] 2) Add 5 g of the ball-milled solid to 50 mL of mixed lye (NaOH, TPAOH and TEAOH) at pH = 10 and stir for 4 h. Add the stirred sol to a 100 mL reaction kettle and crystallize at 200 ° C for 12 h. The product was washed to neutrality, separated by suction filtration, and the obtained solid was dried overnight at 70°C. The obtained solid was calcined at 500°C for 24 hours to remove the template agent at a heating rate of 5°C / min to obtain metal-doped MFI molecular sieve catalyst #2.
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| pore size | aaaaa | aaaaa |
| specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More