Alkyl aromatic isomerization catalyst and preparation and application thereof
A technology for alkyl aromatic hydrocarbons and catalysts, which is applied in the field of alkyl aromatic hydrocarbon isomerization catalysts and their preparation and application, and can solve problems such as low ethylbenzene conversion rate, unsatisfactory catalyst activity, selectivity, and difficulty in meeting production needs in overall performance , to achieve high aromatics isomerization and side chain dealkylation activity, and high isomerization selectivity
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preparation example Construction
[0021] The preparation method of catalyst provided by the invention comprises the steps:
[0022] (1) Mix sodium-type high-silicon five-membered ring zeolite, molybdenum oxide or its precursors with macroporous pseudo-boehmite evenly, add peptizer aqueous solution and knead, then shape, dry, and place in air at 400-650°C Roasting;
[0023] (2) Ion-exchange the solid roasted in step (1) with an ammonium salt solution, wash and dry the obtained solid, and impregnate it with a solution of a Group VIII metal compound. Roasting.
[0024] The step (1) of the method is carrier molding, mixing sodium-type high-silicon five-membered ring zeolite, molybdenum oxide or its precursor and macroporous pseudo-boehmite, adding an aqueous solution of a peptizer and kneading, and the peptizer is preferably Nitric acid, the concentration of the nitric acid solution prepared by adding water is preferably 1 to 5% by mass, more preferably 1.5 to 3.5% by mass. The addition amount of the nitric aci...
example 1
[0043] (1) Preparation of carrier
[0044] Take SiO 2 / Al 2 o 3 NaZSM-5, molybdenum oxide and macroporous pseudoboehmite powder (manufactured by Fushun Petrochemical Company Catalyst Factory, brand YH-2) with a molar ratio of 80 were mixed at a dry basis mass ratio of 65::2:35. After adding an aqueous solution of nitric acid with a concentration of 2% by mass, which accounts for 40% of the total mass of the powder, and kneading, extrusion molding, drying at 120°C for 2 hours, and roasting in air at 600°C for 3 hours to obtain a composite carrier, the macroporous pseudoboehmite The pore volume of YH-2 is 0.96mL / g, and the specific surface area is 364m 2 / g, the pore distribution is shown in Table 1.
[0045] (2) Preparation of catalyst
[0046] Get 100 grams of the composite carrier that (1) step makes, use the NH that concentration is 3 mass % 4 Cl aqueous solution carries out ion exchange at 90 DEG C for 2 hours, then immerses in 65 DEG C for 12 hours with chloroplatini...
example 2
[0048] Prepare catalyzer by the method for example 1, difference is (1) in step, replace macroporous pseudo-boehmite YH-2 with macroporous pseudo-boehmite YH-15 (Fushun Petrochemical Company Catalyst Factory production), described macroporous pseudo-boehmite YH-2 Pseudoboehmite YH-15 has a pore volume of 1.05mL / g and a specific surface area of 368m 2 / g, the pore distribution is shown in Table 1, the composition of the prepared catalyst G is shown in Table 2, and the physical properties are shown in Table 3.
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