Olefin oligomerization catalyst and preparation method thereof
A catalyst and olefin technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of high activity and product selectivity, non-regeneration, easy deactivation, etc., and achieve high activity and selectivity. , the effect of large loading and good oligomerization activity
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Embodiment 1
[0034] First, 8.0 g of the water-soluble chitosan pore-enlarging agent was added to deionized water at 50° C., and then acetic acid was added dropwise until the chitosan was completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh a certain amount of phosphoric acid and potassium nitrate respectively, completely dissolve the phosphoric acid and potassium nitrate in 70 g of distilled water to prepare an aqueous solution containing phosphorus and potassium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, and mix evenly, then add the mixed solution of phosphoric acid, lanthanum nitrate and potassium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite The diaspore powder is evenly kneaded, and then kneaded-extruded into a clover shape. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain an alumina carrier 1 containing phosphorus, lanthanum and potassium. vec...
Embodiment 2
[0037] Add 8.0 g of the water-soluble chitosan pore-enlarging agent into deionized water at 50° C., and then add acetic acid dropwise until the chitosan is completely dissolved to obtain an acid solution containing the pore-enlarging agent. Weigh a certain amount of phosphoric acid and potassium nitrate respectively, completely dissolve phosphoric acid, lanthanum nitrate and potassium nitrate in 70 g of distilled water to prepare an aqueous solution containing phosphorus and potassium. Weigh 350g of pseudo-boehmite powder and 20.0g of fennel powder into the kneader, and mix evenly, then add the mixed solution of phosphoric acid, lanthanum nitrate and potassium nitrate, and finally add the acid solution containing chitosan to the pseudo-boehmite The boehmite powder is evenly kneaded, and then kneaded-extruded into a clover shape. Dry at 120° C. for 8 hours, and calcined at 700° C. for 4 hours to obtain an alumina carrier 2 containing phosphorus, lanthanum and potassium. carrie...
Embodiment 3
[0041] The preparation method of the carrier was carried out according to Example 1. The difference is that the water-soluble chitosan pore-enlarging agent is replaced by the non-water-soluble chitosan pore-enlarging agent, and the chitosan formic acid solution is stirred with a magnetic stirrer for 30 minutes to obtain the alumina carrier 3 with a macroporous structure. The content of the auxiliary components phosphorus, lanthanum and potassium in the carrier accounts for the percentage of the carrier mass, which is P 2 o 5 1.2wt%, La 2 o 3 1.5%, K 2 O 1.4 wt%. Its specific surface area and pore size distribution are shown in Table 1.
[0042] Ferric sulfate hexahydrate and nickel sulfate hexahydrate were prepared as an impregnating solution, and 100 g of alumina carrier with a macroporous structure was impregnated. The specific steps were the same as in Example 1. The catalyst was dried at 130°C for 7h and then calcined at 550°C for 7.0h to obtain isobutylene oligome...
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