Selectively hydrogenating catalyst and preparation method thereof
A hydrogenation catalyst, catalyst technology, applied in the direction of selective hydrorefining, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of impurity resistance to be improved, etc. Effects of diene hydrogenation performance and selectivity, suitable activity, impurity resistance and coking resistance improvement
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[0034] Example 1:
[0035] Carrier preparation
[0036] The carrier was prepared by the well-known conventional extrusion molding method, weighed 200 grams of alumina dry rubber powder produced by Lanzhou Petrochemical Xiangxin Company, added 8 grams of sesame powder, 4 grams of citric acid, 5.5 grams of cerium nitrate were dissolved and mixed with 3 mL of acetic acid , Water is mixed into 160-180mL aqueous solution, poured into alumina powder, kneaded, extruded into a φ4.0 toothed spherical carrier, dried at 110°C, and then calcined at 1060°C for 4 hours to obtain the carrier of the invention. The specific surface of the carrier is 70m 2 / g, the pore volume is 0.55mL / g, and the average pore radius is 12.0nm. Alumina is a mixed crystalline form of θ and α, and θ crystal type alumina accounts for more than 80%.
[0037] Catalyst preparation
[0038] Dissolve 5.0 grams of palladium chloride to prepare 1000 mL of hydrochloric acid aqueous solution, and add 20 mL of 10% citric acid to...
Example Embodiment
[0040] Example 2
[0041] The carrier was prepared according to the method of Example 1, and lanthanum nitrate was added to replace the cerium nitrate when the carrier was prepared. The carrier was calcined at 1150°C for 4 hours, and the carrier had a specific surface area of 56 m 2 / g, the pore volume is 0.51mL / g, and the average pore radius is 13.8nm. Alumina is a mixed crystalline form of θ and α, and θ crystal type alumina accounts for more than 80%.
[0042] Weigh 100 g of the carrier, immerse it in 160 mL of an acidic aqueous solution containing magnesium nitrate and palladium chloride, take it out after about 40 minutes, dry it at 100-110°C for 5 hours, and roast it in a muffle furnace at 550°C for 3 hours. The catalyst B of the present invention was prepared. The catalyst weight percentage content is 0.26% of Pd, 1.8% of La, and 0.25% of Mg. Pd is distributed on the secondary outer layer of the catalyst as a shell layer, the outermost carrier layer has a thickness of 0.0...
Example Embodiment
[0043] Example 3
[0044] The carrier was prepared according to the method of Example 1, and magnesium nitrate was added during the preparation of the carrier so that the final catalyst contained 0.50 (weight)% of Mg. The carrier is calcined at 1000°C for 4 hours, the specific surface area of the carrier is 79m 2 / g, the pore volume is 0.54mL / g, and the average pore radius is 11.8nm. Alumina is theta and delta crystal type, and theta crystal type alumina accounts for more than 80%.
[0045] Weigh 100 g of the carrier, immerse it in 140 mL of an acidic aqueous solution containing palladium chloride, take it out after about 30 minutes, dry it at 100-110°C for 5 hours, and roast it in a muffle furnace at 480°C for 3 hours. The catalyst C of the present invention was prepared. The weight percentage of the catalyst is 0.33% Pd and 0.5% Mg. Ce 1.0%. Pd is distributed on the secondary outer layer of the catalyst as a shell layer, the outermost carrier layer has a thickness of 0.05 mm, ...
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