Ammonia synthesis catalyst and preparation method thereof
A catalyst, ammonia synthesis technology, applied in the production of bulk chemicals, etc., can solve the problem of low activity, and achieve the effect of improving ammonia synthesis activity and good application prospects
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0019] 0.04 mol / L Ce(NO 3 ) 3 ·6H 2 O solution and a certain amount of AgNO 3 Dissolved in a certain amount of deionized water to form A liquid, wherein the amount of silver is 6% of the weight of the ceria carrier in terms of silver simple substance. A certain stoichiometric K 2 RuO 4 (Based on ruthenium simple substance, the weight is 4% of the ceria carrier) dissolved in a certain amount of 2.0 mol / L potassium hydroxide solution to form B solution. Add solution A to solution B dropwise under stirring at room temperature to obtain a black precipitate. Aged at 60°C for 1 h, took it out and let it stand to cool to room temperature, and after high-speed centrifugation, it was washed with deionized water several times to remove potassium nitrate and unreacted potassium hydroxide. Finally, it was dried in an oven at 85 °C for 12 h in H 2 / N 2 Calcined at 500 °C for 1 h in a mixed gas to obtain Ag-Ru / CeO 2 (CP) catalyst. The catalyst is at 10 MPa, 450 ℃, 10000 h -1 At s...
Embodiment 2
[0021] Weigh 12.62 g Ce(NO 3 ) 3 ·6H 2 O was dissolved in 50 ml of deionized water as solution A. Take by weighing potassium ruthenate (the weight in terms of ruthenium is 4% calculation of ceria weight) and press (Ce 4+ +4OH - = Ce(OH) 4 ↓) The precipitant KOH 1.2 times the theoretical value is dissolved in 50 ml deionized water as solution B. Add solution B to solution A dropwise under stirring at room temperature to obtain a black precipitate. Dissolve 0.4720 g of silver nitrate in 100 ml of deionized water as solution C. Disperse the above black precipitate evenly in liquid C again, adjust the pH value to 10 under strong stirring, so that the silver is completely deposited on the catalyst, age at 60 °C for 1 h under slight stirring, take it out and cool it to room temperature, centrifuge, and use After washing with deionized water three times, the precipitate was dried at 85 °C for 12 h, and then calcined in a muffle furnace at 400–500 °C for 2 h. Get 6%Ag-Ru / CeO ...
Embodiment 3
[0023] Weigh 12.62 g Ce(NO 3 ) 3 ·6H 2 O is dissolved in 50 ml deionized water to be liquid A, and potassium ruthenate (the weight in terms of ruthenium is calculated as 4% of the weight of cerium oxide) is weighed and calculated according to (Ce 4+ +4OH - = Ce(OH) 4 ↓) The precipitant KOH which is 1.2 times the theoretical value is dissolved in 50 ml deionized water to form B solution. Add solution A to solution B drop by drop at room temperature under a certain intensity of stirring. Aged for 1 h, taken out and cooled to room temperature, centrifuged, washed with deionized water three times, the precipitate was dried at 95 °C for 12 h, and then calcined in a muffle furnace at 400-500 °C for 2 h. The 0.6 mol / L silver nitrate solution was impregnated in the Ru / CeO 2 catalyst, dried. Get 6%Ag-Ru / CeO 2 Ammonia synthesis catalyst. The catalyst is 10 MPa, 400 ℃, 10000 h -1 At space velocity, the outlet ammonia concentration is 9.4%.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More