A kind of beta molecular sieve rich in mesoporous and preparation method thereof
A molecular sieve and mesoporous technology, applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve the problems of difficult treatment of organic ammonium salt sewage, no modification of surface aluminum distribution, and molecular sieve pore structure damage. Achieve the effects of suppressing surface non-selective side reactions, enriching mesopores, and increasing the specific surface area of micropores
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[0026] The present invention also provides a method for preparing the mesoporous-rich Beta molecular sieve provided by the present invention, the preparation method comprising: a, carrying out alkali treatment on the sodium-type Beta molecular sieve in an alkaline solution, and after filtering and washing, Obtain the alkali-treated molecular sieve; b, carry out the dealumination treatment in the complex acid dealumination agent solution composed of fluosilicic acid, organic acid and inorganic acid, and filter and wash the obtained alkali-treated molecular sieve in step a, to obtain the described Mesoporous rich Beta molecular sieves.
[0027] According to the present invention, the sodium-type Beta molecular sieve is well known to those skilled in the art. For details, please refer to U.S. Patent No. 3,308,069 and Chinese Patent CN 00107486.5. It can be obtained by crystallization without amine, or it can be roasted by the molecular sieve prepared by the template method. The l...
Embodiment 1
[0039] With 100gBeta molecular sieve (catalyst Qilu branch production, SiO 2 / Al 2 o 3 =25, the sodium oxide content is 4.5% by weight, the same below; dry basis mass) is added with water and beaten to obtain a molecular sieve slurry with a solid content of 10% by weight, and 11.4g of high alkali sodium metaaluminate solution (Na 2 O is 290g / L, Al 2 o 3 40g / L, the solution density is 1.353g / mL), heated to 50°C and stirred at a constant temperature for 0.5h, filtered and washed until neutral; the filter cake was beaten with water to obtain a molecular sieve slurry with a solid content of 20% by weight, and 5.3g Oxalic acid, then slowly add 51g hydrochloric acid (mass fraction 10%) and 17g fluosilicic acid (concentration 20%) dropwise at the same time, raise the temperature to 50°C and stir at a constant temperature for 1h, filter, wash and dry to obtain molecular sieve sample A, the physical and chemical properties of molecular sieve sample A are listed in Table 1 and after...
Embodiment 2
[0057] Add water to 100g Beta molecular sieve (mass on dry basis) to prepare a molecular sieve slurry with a solid content of 10% by weight, add 16g NaOH (purity 96%), heat up to 50°C and stir at a constant temperature for 0.5h, filter and wash until neutral; add water to beat the filter cake to obtain a solid Molecular sieve slurry with a content of 20% by weight, 16g of oxalic acid was added during stirring, and then 108g of hydrochloric acid (mass fraction 10%) and 26g of fluosilicic acid (concentration of 20%) were slowly added dropwise at the same time, the temperature was raised to 50°C and stirred at a constant temperature for 1 hour, filtered, washed and dried Molecular sieve sample B was obtained. The physical and chemical properties of molecular sieve sample B are listed in Table 2 and the micro-reaction evaluation data of ethylcyclohexane after aging at 800°C, 17h, and 100% steam are listed in Table 2.
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