C7-C10 n-alkane isomerization catalyst and preparation method thereof
A catalyst and isomerization technology, applied in the direction of isomerization hydrocarbon production, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of weak acidity, reduce the crystallinity of molecular sieve, etc., and achieve low cracking activity and product liquid yield The effect of high and good isomerization product selectivity
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example 1
[0023] Preparation of pure silicon MCM-41 mesoporous molecular sieves.
[0024] Solution a: Take 4.31ml of sodium silicate solution and disperse it in 50ml of water, and add 10.1ml of cetyl ammonium hydroxide solution with a concentration of 40% under stirring.
[0025] Prepare solution b: Dissolve 18.2 grams of cetyl ammonium bromide in 150 ml of hot water at 50°C.
[0026] Add the prepared solution a dropwise to solution b, stir for 30 minutes, add 4.52 grams of silicon dioxide, stir vigorously for 2 hours to form a gel, then adjust the pH of the solution to 11 with dilute sulfuric acid, and stir for 1 hour; Transfer to a polytetrafluoroethylene-lined crystallization kettle for crystallization at 80°C for 72 hours. The crystallized product was filtered, washed, dried at 110°C for 12 hours, and calcined at 580°C for 5 hours to obtain pure silicon MCM-41 mesoporous molecular sieve S 1 , and its physical and chemical data are shown in Table 1.
example 2
[0028] Preparation of the catalyst of the present invention.
[0029] Get the S prepared by Example 1 1 8.0 grams of molecular sieves, 2.0 grams of pseudo-boehmite powder (produced by SaSol, PURAL SB, alumina content 74% by mass) were mixed uniformly, 6.7 ml of 6.0% by mass of nitric acid solution was added and kneaded, extruded, dried at 120°C for 2 hours, Baking at 550°C for 4 hours. with 2.5 g H3 PW 12 o 40 25 milliliters of the solution was statically impregnated at 25°C for 12 hours, and the impregnated solid was dried at 120°C for 2 hours and calcined at 550°C for 4 hours to make a composite carrier. The composite support was impregnated with 5.0 milliliters of chloroplatinic acid solution with a Pt content of 7.5 mg / ml for 24 hours. After impregnation, the solid was dried at 120°C for 2 hours and calcined at 650°C for 4 hours to obtain catalyst A. The composition is shown in Table 2, wherein platinum The content is calculated based on the composite carrier.
example 3
[0031] Prepare the catalyst by the method of example 1, the difference is that 10 grams of S 1 Molecular sieves and 10 grams of pseudo-boehmite powder are mixed evenly, and 13.2 milliliters of 6 mass % nitric acid solution are added to knead, extruded into strips, dried and roasted, and then used to contain 7.5 grams of H 3 PW 12 o 40 25 ml of phosphotungstic acid solution was impregnated at 25°C for 12 hours, dried and calcined to make a composite carrier, then impregnated with 11.0 ml of chloroplatinic acid solution with a Pt content of 7.5 mg / ml for 24 hours, and dried at 120°C for 2 hours, Catalyst B was prepared by calcining at 650°C for 4 hours, and its composition is shown in Table 2.
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