A kind of preparation method and application of xylene isomerization catalyst
A technology of isomerization and xylene, which is applied in the field of preparation of aromatic hydrocarbon isomerization catalysts, can solve the problems of cumbersome method steps and poor modification effect
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example 1
[0051] Take 10 grams of SiO 2 / Al 2 o 3 The ZSM-5 molecular sieve powder with a molar ratio of 20 is thoroughly mixed with 10 grams of alumina. Add 20 ml of 3% nitric acid aqueous solution, knead, and extrude. Dry the strips at 120°C for 6 hours, then cut into pellets, and bake at 550°C for 4 hours. Use 50 milliliters of 2% ammonium chloride aqueous solution to carry out ion exchange at 90 ° C for 2 hours, and wash with deionized water until there is no chloride ion in the mother liquor. Immerse in 6 grams of tetramethylsiloxane at 25°C for 8 hours, drain the tetramethylsiloxane after the impregnation, and dry at 120°C for 8 hours. -1 Under the conditions of hydrothermal treatment for 4 hours, and then under the conditions of 280 ℃ and 2.0MPa, it was calcined in the air for 6 hours. Then immerse in 20 milliliters of chloroplatinic acid aqueous solution containing 0.004 grams of platinum for 5 hours, dry at 120°C for 2 hours, then roast at 450°C in air for 5 hours, and red...
example 2
[0053] Prepare catalyst by the method for example 1, difference is to get SiO 2 / Al 2 o 3 16 grams of ZSM-5 molecular sieve with a molar ratio of 200 and 4 grams of alumina were kneaded and formed. After ammonium exchange, they were immersed in 60 grams of octamethylcyclotetrasiloxane at 25 ° C for 24 hours. After the impregnation, the octamethyl cyclotetrasiloxane was drained. Cyclotetrasiloxane, dry at 120°C for 48 hours, at 450°C, 0.1MPa, water vapor passing through space velocity for 5h -1 Hydrothermal treatment for 8 hours under the condition of 500°C and 0.1MPa in the air for 2 hours, impregnated with platinum, dried, roasted, and reduced to obtain catalyst Cc-2 with a platinum content of 0.02% by mass.
example 3
[0055] Take SiO 2 / Al 2 o 3 12 grams of ZSM-5 molecular sieves with a molar ratio of 60 were ion-exchanged with 50 ml of 2% ammonium chloride aqueous solution at 90°C for 2 hours, and washed with deionized water until there was no chloride ion in the mother liquor. Dry at 120°C for 6 hours, roast at 550°C for 4 hours, immerse in 20 grams of simethicone oil (molecular weight: 1000) with a viscosity of 10 centipoise at 25°C for 8 hours, drain the simethicone oil after immersion, and roast at 550°C 6 hours, at 150°C, 0.1MPa, water vapor passing through the space velocity of 1h -1 Under the condition of hydrothermal treatment for 4 hours, and then under the condition of 280 ℃ and 0.1MPa, it was calcined in the air for 4 hours to obtain the silicon-modified molecular sieve.
[0056] Mix the above-mentioned silicon-modified molecular sieve with 8 grams of alumina evenly, add 20 ml of 3% nitric acid aqueous solution, knead, and extrude. Dry the bar at 120°C for 6 hours, then cut ...
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