Rare earth oxide supported ruthenium catalyst and its preparation method and application
A technology of rare earth oxide and ruthenium catalyst, which is applied in the field of preparation of rare earth oxide supported ruthenium catalyst, rare earth oxide supported ruthenium catalyst, and preparation of rare earth oxide supported ruthenium catalyst, which can solve the problems of poor stability, low conversion rate and low cost. Advanced problems, to achieve the effect of high stability, low cost, and low preparation cost
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Embodiment 1
[0052] Take by weighing 0.041 gram of ruthenium chloride and be dissolved in 100 milliliters of water, add 1.70 grams of scandium oxalate to the ruthenium chloride aqueous solution under stirring, add 1.9 grams of urea to the above-mentioned suspension after stirring (the mol ratio of urea and ruthenium is 160:1), and then reacted at 100°C for 8 hours with stirring. After the reaction was completed, the product was filtered, and the product was repeatedly washed with deionized water until the filtrate was neutral. After drying, the product was reduced with hydrogen at 400° C. for 2 hours to obtain a scandium oxide-supported ruthenium catalyst (3 wt% Ru / Sc 2 O 3 ).
[0053] The ammonia decomposition reaction activity of the prepared catalyst was evaluated in an ammonia decomposition device. In pure ammonia, the space velocity is 30000mL g cat -1 h -1 , under the reaction conditions of normal pressure, the reaction temperature is 450 ℃, the ammonia conversion rate is 86.9%...
Embodiment 2
[0055] Take by weighing 0.041 gram of ruthenium chloride and be dissolved in 50 milliliters of water, add 1.14 grams of yttrium oxalate to the ruthenium chloride aqueous solution under stirring, add 0.9 gram of urea to the above-mentioned suspension after stirring (the mol ratio of urea and ruthenium is 80:1), and then reacted at 80°C for 8 hours with stirring. After the reaction was completed, the product was filtered, and the product was repeatedly washed with deionized water until the filtrate was neutral. After drying, the product was reduced with hydrogen at 500° C. for 2 hours to obtain a yttrium oxide-supported ruthenium catalyst (3 wt% Ru / Y) with a ruthenium loading of 3 wt %. 2 O 3 ).
[0056] The ammonia decomposition reaction activity of the prepared catalyst was evaluated in an ammonia decomposition device. In pure ammonia, the space velocity is 30000mL g cat -1 h -1 , under the reaction conditions of normal pressure, the reaction temperature is 450 ℃, the am...
Embodiment 3
[0058] Take by weighing 0.041 gram of ruthenium chloride and be dissolved in 200 milliliters of water, add 0.86 gram of lanthanum oxalate to the ruthenium chloride aqueous solution under stirring, add 3.5 grams of urea (the mol ratio of urea and ruthenium is 3.5 grams of urea to above-mentioned suspension after stirring) 294:1), and then reacted at 150°C for 2 hours with stirring. After the reaction was completed, the product was filtered, and the product was repeatedly washed with deionized water until the filtrate was neutral. After drying, the product was reduced with hydrogen at 800° C. for 1 hour to obtain a lanthanum oxide-supported ruthenium catalyst (3wt% Ru / La) with a ruthenium loading of 3wt%. 2 O 3 ).
[0059] The ammonia decomposition reaction activity of the prepared catalyst was evaluated in an ammonia decomposition device. In pure ammonia, the space velocity is 30000mL g cat -1 h -1 , under the reaction conditions of normal pressure, the reaction temperatu...
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