A kind of cobalt-based Fischer-Tropsch catalyst and its preparation method and application
A cobalt-based catalyst and catalyst technology, applied in catalyst protection, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of cobalt particle sintering, growth and deactivation, and achieve low methane and CO2 selectivity, preparation method Simple, catalytic effect maintains stable effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0042] Example 1 Preparation of cobalt-based Fischer-Tropsch catalyst
[0043] In the first step, 40mL containing 0.3mol / L NaOH and 0.7g Na 2 CO 3 The aqueous solution was added dropwise within 30-40 minutes to 40 mL of 80 °C containing 0.35 mol / L CoCl 2 In aqueous solution, with vigorous stirring, a cobalt precipitate formed. The precipitate was aged in the mother liquor for 2 hours; the precipitate was then filtered and washed several times with water and ethanol. The precipitate was finally dried at 90°C for 10 hours, followed by calcination at 500°C for 5 hours. Observation by TEM electron microscope shows that the average particle size of the cobalt oxide particles is 8-15 nm.
[0044] The second step is to deposit ZrO on the outer surface of the cobalt oxide nanoparticles by atomic layer deposition. 2 . Specifically, the material obtained in the first step was put into the cavity of the atomic layer deposition instrument, the cavity temperature was 100 °C, and the ...
Embodiment 2
[0048] The first step is the same as the first step in Example 1.
[0049] The second step is the same as the second step in Example 1.
[0050] In the third step, the material obtained in the second step was placed in 1.5 g CTAB, 20 mL of 28 wt% NH 4 OH and 300 mL of ethanol, followed by 25 minutes of sonication and 25 minutes of vigorous stirring, 3.0 mL of ethyl orthosilicate solution was slowly added dropwise. After the dropwise addition, the mixture was stirred at 50°C for 24 hours. The precipitate was centrifuged and dried at 120°C for 12 hours and calcined at 550°C for 5 hours. obtained with SiO 2 Coated catalyst B; after analysis, the mass fraction of Co in this example is 20.2wt%, and the transition layer ZrO 2 The mass fraction of 3.4wt%, SiO 2 The thickness of the shell layer is about 29 nm.
[0051] In the fourth step, the catalyst prepared in the third step is tableted, crushed, and screened for 20-40 mesh particles for evaluation of the catalytic reaction. ...
Embodiment 3
[0053] The first step is the same as the first step in Example 1.
[0054] The second step is the same as the second step in Example 1.
[0055] In the third step, the consumption of ethyl orthosilicate in the third step of Example 2 was changed to 1.0 mL, and the other steps were the same. obtained with SiO 2 Coated catalyst C; after analysis, the mass fraction of Co in this example is 40.1wt%, and the transition layer ZrO 2 The mass fraction of 6.7wt%, SiO 2 The thickness of the shell layer is about 8.5 nm. The catalyst C was photographed by a transmission electron microscope, and the TEM picture is shown in figure 1 ,Depend on figure 1 It can be seen that the surface of the cobalt particles is wrapped with a film layer with a thickness of about 15 nm.
[0056] In the fourth step, the catalyst prepared in the third step is tableted, crushed, and screened for 20-40 mesh particles for evaluation of the catalytic reaction.
PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| particle size | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More 
PatSnap Eureka turns technology decisions into work you can execute. Powered by our Innovation Knowledge Graph, it runs expert workflows across engineering, life sciences, materials and intellectual property. Get your review-ready output in minutes.
