Carried noble metal complete-combustion catalyst and its prepn
A complete combustion and catalyst technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of short service life of catalysts and achieve good stability and production Low cost and long life effect
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Embodiment 1
[0014] Take Al(NO 3 ) 3 (1M) 36 ml with Mg(NO 3 ) 2 (2M) 2 ml mixed well, with (NH 4 ) 2 CO 3 16.7g made into 25ml of precipitant, constant temperature 60℃, co-dropping under strong stirring; system pH value is 7-12, precipitation aging for 0.5 hours, washed 5 times with 100ml distilled water until no NO 3 - , after drying at 110°C for 10 hours, calcining at 900°C for 5 hours to obtain the carrier; the carrier powder was immersed in 0.053gPd(NO 3 ) 2 In the dissolved aqueous solution, dry at 110°C for 10 hours, and then calcined at 800°C for 5 hours to form particles of 0.3-0.5 mm. The catalyst was composed of 2% CH 4 , 10%O 2 , 88%N 2 Mixed gas at 48000h -1 Under the condition of space velocity passing through the bed, the reaction characteristic temperature is: T 10 =295°C, T 30 =335°C, T 70 =363°C, T 90 = 400°C. CO and NO in exhaust gas x The concentration is less than 1ppm. where T 10 , T 30 , T 70 , T 90 are the temperatures when the methane convers...
Embodiment 2
[0016] Al(NO 3 ) 3 (1M) 50ml with Mg(NO 3 ) 2 (2M) 6.3 ml mixed well, with (NH 4 ) 2 CO 3 25.2g of precipitant 30ml, constant temperature 60°C, co-dropping under strong stirring; system pH value is 7-12, precipitate and age for 0.5 hours, wash 5 times with 100ml distilled water until no NO 3 - , after drying at 110°C for 10 hours, calcining at 1000°C for 5 hours to obtain a carrier; the carrier powder was immersed in 0.079gPd(NO 3 ) 2 In the dissolved aqueous solution, dry at 110°C for 10 hours, and then calcined at 800°C for 5 hours to form particles of 0.3-0.5 mm. The catalyst was composed of 2% CH 4 , 10%O 2 , 88%N 2 Mixed gas at 48000h -1 Under the condition of space velocity passing through the bed, the reaction characteristic temperature is: T 10 =294°C, T 30 =335°C, T 70 =362°C, T 90 = 398°C. CO and NO in exhaust gas x The concentration is less than 1ppm.
Embodiment 3
[0018] Al(NO 3 ) 3 (1M) 36 ml with Mg(NO 3 ) 2 (2M) 2 ml mixed well, with (NH 4 ) 2 CO 3 25 ml of precipitant made from 16.7 g, constant temperature at 60°C, co-dropping under vigorous stirring; precipitation aging for 0.5 hour, washed 5 times with 100 ml of distilled water until no NO 3 - , after drying at 110°C for 10 hours, calcining at 1200°C for 5 hours to obtain a carrier; the carrier powder was immersed in 0.053gPd(NO 3 ) 2 In the dissolved aqueous solution, dry at 110°C for 10 hours, and then calcined at 800°C for 5 hours to form particles of 0.3-0.5 mm. The catalyst was composed of 2% CH 4 , 10%O 2 , 88%N 2 Mixed gas at 48000h -1 Under the condition of space velocity passing through the bed, the reaction characteristic temperature is: T 10 =325°C, T 30 =358°C, T 70 =392°C, T 90 = 425°C. CO and NO in exhaust gas x The concentration is less than 1ppm.
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