A kind of method for preparing anhydrous formaldehyde by oxygen-free dehydrogenation
An anhydrous formaldehyde and dehydrogenation technology, which is used in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, etc. problems, to achieve the effect of good catalyst stability, improved selectivity and purity, and large active surface area
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0016] Weigh 5g of ZSM-5 and add it to 30mL of 0.5mol / L ammonium fluorosilicate aqueous solution, stir at 80°C for 6h, filter and wash, repeat this process 3 times, and dry at 100°C for 10h to obtain the dealuminated molecular sieve carrier. Weigh 1.9g of copper nitrate trihydrate, 2.3g of zinc nitrate hexahydrate and the ZSM-5 molecular sieve after the dealumination were added to 250mL of water, stirred at 80°C for 30min, and prepared 1mol / L sodium carbonate solution to adjust the pH of the above system to 8 , continue to stir for 30 minutes, filter while hot, wash with 1L of 80°C hot water until neutral, and dry it in an oven at 80°C overnight. Calcined at 550°C for 4 hours in air to obtain the copper-based catalyst. Weigh 2 g of the catalyst to form a tablet, sieve to 14-25 mesh, and fill it into a quartz tube reactor. At 600°C, methanol was pre-reduced to activate the copper-based catalyst for 1 hour. Under normal pressure, nitrogen gas was used as the carrier gas, and 4...
Embodiment 2
[0018] Weigh 5g of NaY molecular sieve and add it to 30mL of 0.5mol / L ammonium fluorosilicate aqueous solution, stir at 100°C for 6h, filter and wash, repeat this process 3 times, and dry at 100°C for 10h to obtain the dealuminated molecular sieve carrier. Weigh 0.8g of chromium nitrate nonahydrate, 1.9g of copper nitrate trihydrate, 2.3g of zinc nitrate hexahydrate, and the NaY-type molecular sieve after dealumination, add them to 250mL of water, stir at 80°C for 30min, and prepare a 1mol / L sodium carbonate solution Adjust the pH of the above system to 8, continue to stir for 30 minutes, filter while hot, wash with 1L of 80°C hot water until neutral, and dry it in an oven at 120°C overnight. Calcined at 650°C for 4 hours in air to obtain the copper-based catalyst. Weigh 2 g of the catalyst to form a tablet, sieve to 14-25 mesh, and fill it into a quartz tube reactor. At 600°C, methanol was pre-reduced to activate the copper-based catalyst for 1 h. Under normal pressure, nit...
Embodiment 3
[0020]Weigh 5g of HY molecular sieve and add it to 30mL of 0.5mol / L sodium fluorosilicate aqueous solution, stir at 80°C for 6h, filter and wash, repeat this process 3 times, and dry at 100°C for 10h to obtain the dealuminated molecular sieve carrier . Weigh 1.9g of copper nitrate trihydrate, 2.3g of zinc nitrate hexahydrate and the above-mentioned dealuminated HY molecular sieve into 250mL of water, stir at 80°C for 30min, prepare a 1mol / L potassium carbonate solution to adjust the pH of the above system to 8, continue Stir for 30 minutes, filter while hot, wash with 1L of 80°C hot water until neutral, and dry it in an oven at 150°C overnight. Calcined at 600°C for 4 hours in air to obtain the copper-based catalyst. Weigh 2 g of the catalyst to form a tablet, sieve to 14-25 mesh, and fill it into a quartz tube reactor. At 600°C, methanol was pre-reduced to activate the copper-based catalyst for 1 hour. Under normal pressure, nitrogen gas was used as the carrier gas, and 40 ...
PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More