Preparation method and application of a nickel-based multimetal catalyst for carbon dioxide methanation
A multi-metal catalyst, carbon dioxide technology, applied in metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of poor stability, easy coking, low activity, etc. Achieve the effect of high reaction stability, good reactivity and high methane selectivity
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Embodiment 1
[0033] A nickel-based multimetal catalyst for carbon dioxide methanation (TiO 2 -Ni-Co-Fe) preparation method: weigh 5g of TiO 2 Roast in a muffle furnace at 500°C for 2h, the heating rate is 2°C / min, take 0.5g of the calcined TiO 2 The sample powder was dispersed in 150ml of deionized water, stirred at a speed of 500r / min for 20min, and then ultrasonicated at a power of 60kHz for 60min. To the dispersed solution, sequentially add Ni(NO 3 ) 2 1ml of aqueous solution, Co(NO 3 ) 2 0.5ml aqueous solution, Fe element content 50mg / ml Fe(NO 3 ) 3 Aqueous solution 0.05ml. After the solution was fully mixed, it was soaked for 0.5 h, and then a NaOH aqueous solution with a concentration of 0.2 mol / L was added dropwise to the solution under stirring conditions to adjust the pH to 10. The precipitate was collected after 3 hours and dried at 60°C. After the dried sample is ground, take 0.2g sample and put it into the fixed bed reactor, and use H 2 For reduction, the temperature ...
Embodiment 2
[0036] A nickel-based multimetal catalyst for carbon dioxide methanation (TiO 2 -Ni-Co-Fe) preparation method: weigh 5g of TiO 2 Roast in a muffle furnace at 500°C for 2h, the heating rate is 2°C / min, take 0.5g of the calcined TiO 2 The sample powder was dispersed in 150ml of deionized water, stirred at a speed of 500r / min for 30min, and then ultrasonicated at a power of 60kHz for 30min and twice. To the dispersed solution, sequentially add Ni(NO 3 ) 2 1.2ml aqueous solution, Co(NO 3 ) 2 1ml of aqueous solution, Fe(NO 3 ) 3 Aqueous solution 0.05ml. After the solution was fully mixed, it was soaked for 1 h, and then NaOH aqueous solution was added dropwise to the solution under stirring condition, and its concentration was 0.2 mol / L to adjust the pH to 7. After 3 hours of precipitation, it was collected and dried at 60°C. After the dried sample is ground, take 0.2g sample and put it into the fixed bed reactor, and use H 2 For reduction, the temperature is controlled a...
Embodiment 3
[0039] A nickel-based multimetal catalyst for carbon dioxide methanation (TiO 2 -Ni-Co-Fe) preparation method: the dried sample powder in Example 2, take 0.2g sample into the fixed bed reactor, use H 2 For reduction, the temperature is controlled at 350°C, the heating rate is 5°C / min, and the reaction space velocity is 7500ml·gcat -1 h -1 . After the reduction is completed, the reaction raw material gas (for CO 2 、H 2 , Ar mixed gas, the volume proportions are 3%, 12%, and 85% respectively), the reaction temperature is 190°C, the heating rate is 2°C / min, and the reaction space velocity is 3000ml·gcat -1 h -1 .
[0040] For the activity evaluation of the catalyst prepared in this example, see Figure 4 Shown in Example 3, methane selectivity in its product > 99%.
[0041] The XRD spectrum of the catalyst sample prepared in this embodiment is shown in figure 1 . It can be seen from the figure that the carrier titanium dioxide and the active component peaks are clearly ...
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