Catalyst for direct production of low-carbon olefins from core-shell type synthesis gas, production method and application
A low-carbon olefin and catalyst technology, which is applied in the application field of low-carbon olefin synthesis, can solve problems such as catalyst differences, and achieve the effects of short crystallization time, adjustable shell thickness, and shortened process cycle
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Embodiment 1
[0023] 300ml 10wt%Co(NO 3 ) 3 ·6H 2 O and 200ml 10wt% Mn(NO 3 ) 2 The solution was mixed, and then added ruthenium chloride to make the content 0.05wt%, and then it was mixed with 500ml NH 3 ·H 2 O (25-28wt%) solution is co-precipitated in parallel, and the precipitate is aged, washed and filtered to obtain a mixture of Co and Mn.
[0024] With tetrapropyl ammonium hydroxide TPAOH as structure directing agent, the molar ratio of sol is 1.0TEOS:0.25TPAOH:0.025((CH 3 ) 2 CHO) 3 Al:50H 2 O:2EtOH. These substances were sequentially added to a stainless steel reaction kettle lined with polytetrafluoroethylene, stirred at 60°C and 10 rpm for 2 hours until a bright yellow uniform sol was formed, and 150ml sol was obtained. Then add Co and Mn mixture precipitates into the sol, stir evenly, and crystallize at 120°C and 10rpm for 10h. After natural cooling, wash the filtrate repeatedly with deionized water until the pH value is 7.9, dry at 60°C for 12 hours, and roast at 450°...
Embodiment 2
[0027] 500ml 10wt%Co(NO 3 ) 3 ·6H2 O and 300ml 50wt% Mn(NO 3 ) 2 The solution is mixed, and then a certain amount of lanthanum nitrate is added to make the content 2wt%, and then it is mixed with the mixed solution with an equal volume of NH 3 ·H 2 O (25-28wt%) solution is co-precipitated in parallel, and the precipitate is aged, washed and filtered to obtain a mixture of Co and Mn.
[0028] With tetrapropyl ammonium hydroxide TPAOH as the structure-directing agent, the molar ratio of the sol is 3TEOS:0.5TPAOH:0.06((CH 3 ) 2 CHO) 3 Al:80H 2 O:5EtOH. These substances were sequentially added to a stainless steel reaction kettle lined with polytetrafluoroethylene, stirred at 80°C and 20 rpm for 4 hours until a bright yellow uniform sol was formed, and 200ml of sol was obtained. Add the precipitated Co and Mn mixture into the sol, stir evenly, and crystallize at 180°C and 30rpm for 20h. After natural cooling, wash the filtrate repeatedly with deionized water until the pH...
Embodiment 3
[0031] 350ml 15wt%Co(NO 3 ) 3 ·6H 2 O and 300ml 50wt% Mn(NO 3 ) 2 The solution was mixed, and then a certain amount of chloroplatinic acid was added to make the content 0.5wt%, and then it was mixed with the mixed solution with an equal volume of NH 3 ·H 2 O (25-28wt%) solution is co-precipitated in parallel, and the precipitate is aged, washed and filtered to obtain a mixture of Co and Mn.
[0032] With tetrapropyl ammonium hydroxide TPAOH as structure directing agent, the molar ratio of sol is 1.5TEOS:0.3TPAOH:0.03((CH 3 ) 2 CHO) 3 Al:50H 2 O:2EtOH. These substances were sequentially added to a stainless steel reaction kettle lined with polytetrafluoroethylene, stirred at 60°C and 15 rpm for 2 hours until a bright yellow uniform sol was formed, and 150ml of sol was obtained. Add the precipitated Co and Mn mixture into the sol, stir evenly, and crystallize at 120°C and 15rpm for 12h. After natural cooling, wash the filtrate repeatedly with deionized water until the...
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