A kind of isobutane dehydrogenation preparation isobutene catalyst, its preparation method and application
A technology for producing isobutene and catalyst, which is applied in the field of isobutane dehydrogenation to produce isobutene, can solve the problems of affecting the service life of the catalyst, deep dehydrogenation and cracking, and weak anti-carbon deposition ability, so as to improve chemical stability and life, Improve the conversion rate and yield, improve the effect of anti-carbon deposition ability
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Embodiment 1
[0033] Preparation of modified carrier
[0034] Add 1g of attapulgite to 100g of pure alumina powder, then add 2wt% nitric acid aqueous solution to knead, extrude, dry at 120°C for 10 hours, and roast at 500°C for 4 hours to obtain attapulgite. Modified carrier A in an amount of 1 wt% of the weight of the carrier (alumina).
[0035] Catalyst preparation
[0036]Immerse 100g of modified carrier A into 19ml of 0.032g / ml aqueous solution of chloroplatinic acid for 8 hours, drain the water, wash with deionized water until there is no chloride ion, dry at 120°C for 10 hours, and then Calcined at 600°C for 5 hours, then immersed in 107ml of magnesium nitrate 0.4g / ml aqueous solution, soaked for 8 hours, dried at 120°C for 10 hours, and calcined at 600°C for 5 hours to obtain catalyst A. Wherein the platinum content is 0.26wt% of the catalyst weight, and the magnesium content is 12.14wt% of the catalyst weight.
Embodiment 2
[0038] Preparation of modified carrier
[0039] Add 1.5g of attapulgite to 100g of pure alumina powder, then add 2wt% nitric acid aqueous solution, knead, extrude, dry at 120°C for 10 hours, and roast at 650°C for 5 hours to obtain attapulgite The amount of modified support B is 1.5 wt% of the support weight.
[0040] Catalyst preparation
[0041] Immerse 100g of modified carrier B into 35ml of 0.025g / ml aqueous solution of chloroplatinic acid. After soaking for 9 hours, drain the water and wash with deionized water until there are no chloride ions. Dry at 120°C for 10 hours. Calcined at ℃ for 6 hours, then immersed in 157ml of magnesium nitrate 0.35g / ml aqueous solution, soaked for 9 hours, dried at 120℃ for 10 hours, and calcined at 700℃ for 6 hours to obtain catalyst B. Wherein the platinum content is 0.35wt% of the catalyst weight, and the magnesium content is 15.20wt% of the catalyst weight.
Embodiment 3
[0043] Preparation of modified carrier
[0044] Add 2g of attapulgite to 100g of pure alumina powder, then add 2wt% nitric acid aqueous solution to knead, extrude, dry at 120°C for 11 hours, and roast at 600°C for 6 hours to obtain attapulgite. Modified carrier C in an amount accounting for 2 wt% of the carrier weight.
[0045] Catalyst preparation
[0046] Immerse 100g of modified carrier C into 56ml of 0.015g / ml aqueous solution of chloroplatinic acid. After soaking for 8 hours, drain the water and wash with deionized water until there are no chloride ions. Dry at 120°C for 10 hours. Calcined at a temperature of 1°C for 7 hours, then immersed in 209ml of magnesium nitrate 0.25g / ml aqueous solution, soaked for 8 hours, dried at a temperature of 120°C for 10 hours, and fired at a temperature of 700°C for 7 hours to obtain catalyst C. Wherein the platinum content is 0.34wt% of the catalyst weight, and the magnesium content is 14.48wt% of the catalyst weight.
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