Xylene isomerization catalyst and preparation method and application thereof
A catalyst, isomerization technology, applied in the direction of isomerization hydrocarbon production, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve problems such as uneconomical, difficult separation of ethylbenzene and xylene, and achieve high yield, inhibit The effect of the disproportionation side reaction
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[0023] The first preparation method of the catalyst of the present invention comprises the steps of:
[0024] (1) Sodium ZSM-5 and alumina are mixed and formed, after drying and roasting, ammonium exchange is performed with ammonium salt solution, and ion exchange is performed with a solution of group IIA metal salt, or ammonium salt and group IIA metal salt are used for ion exchange ion-exchange the solution, wash and dry the exchanged solid to obtain a composite carrier,
[0025] (2) impregnating the composite carrier prepared in step (1) with a solution containing a platinum compound, and after impregnating, the solid is dried, calcined, and then reduced.
[0026] The second preparation method of the catalyst of the present invention comprises the steps of:
[0027] (1) ZSM-5 molecular sieves exchanged with group IIA metals and ammonium and alumina are mixed and formed, and the composite carrier is obtained after drying.
[0028] (2) impregnating the composite carrier pre...
example 1
[0044] (1) Preparation of composite carrier
[0045] Take 10 grams of SiO 2 / Al 2 o 3 Molar ratio (measured by X-ray fluorescence method, the same below) is 20 NaZSM-5 molecular sieve powder, 10 grams of alumina powder (on a dry basis, the same below, produced by Condea Company, brand C1 powder) are mixed evenly, add 20 ml Aqueous nitric acid solution with a concentration of 3% by mass was kneaded, extruded into strips, dried at 120° C. for 6 hours, then pelletized, and calcined at 550° C. for 4 hours. Use 500 milliliters of ammonium chloride aqueous solution with a concentration of 0.1 mol / liter to carry out ammonium exchange at 90° C. for 2 hours, wash the ammonium-exchanged solid with deionized water until there is no chloride ion in the washing liquid, and then use 500 milliliters of ammonium chloride with a concentration of 0.01 mol / liter One liter of calcium nitrate aqueous solution was subjected to ion exchange at 90° C. for 2 hours, the ion-exchanged solid was washe...
example 2
[0049] Prepare catalyst by the method for example 1, difference is (1) step gets 12 grams of SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a molar ratio of 200 and 8 grams of alumina were mixed and then kneaded, extruded, dried and roasted. Mix 500 ml of ammonium chloride aqueous solution with a concentration of 0.1 mol / L and 500 ml of calcium nitrate aqueous solution with a concentration of 0.025 mol / L, perform ion exchange on the roasted solid at 90°C for 2 hours, and wash with deionized water to the washing liquid No chloride ion in the medium, dry at 120°C for 8 hours to obtain a composite carrier, (2) step impregnating platinum chloroplatinic acid aqueous solution containing 0.006 g of platinum, after impregnating, the solid is dried, roasted and reduced to obtain catalyst C-2, its composition See Table 1.
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