Method for preparing ITQ-2 molecular sieve

A technology of ITQ-2 and molecular sieve, applied in the field of preparation of ITQ-2 molecular sieve, can solve the problems of high cost, unfavorable industrial application, poor effect, etc., and achieve the effect of rationalized yield, simple and feasible method, and pollution reduction.
CN101973560AInactive Publication Date: 2011-02-16DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Publication Date
2011-02-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for preparing an ITQ-2 molecular sieve, which is characterized in that an MCM-22 molecular sieve is prepared, NaOH, KOH or mixture of NaOH and KOH or silicate containing NaOH and KOH is taken as an alkali source to prepare alkali solution; a silicon source is added in the obtained alkali solution and stirred to obtain solution A; an expanding agent is added into the solution A to obtain solution B; the solution B is heated and stirred continuously, then the MCM-22 molecular sieve is added in the solution B for expanding treatment, the expanded pulp is treated by ultrasonic wave, and the pH value of the solution after ultrasonic treatment is adjusted by acid solution. In the method, quaternary ammonium base for synthesizing the ITQ-2 molecular sieve is completely replaced by inorganic base, the production cost is low, desilicication by adding the silicon source is restrained, and the rationalization of the yield of target products is guaranteed. The method is simple and available and does not require the addition of organic base, thus reducing the pollution to the environment due to decomposition of the organic matters in the process of subsequent processing.
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Description

technical field

[0001] The invention belongs to the field of molecular sieve material preparation and relates to a preparation method of ITQ-2 molecular sieve. Background technique

[0002] ITQ-2 molecular sieve is prepared by expansion and exfoliation of MCM-22 molecular sieve. It has a single-layer structure of MCM-22 molecular sieve and belongs to the MWW topology. MCM-22 molecular sieve has three sets of independent pore systems: a pore system connected by a supercage (0.71×0.71×1.82nm) and an interlayer 10-membered ring (0.4×0.54nm), and a two-dimensional sinusoidal pore system with an intralayer 10-membered ring. And the 12-membered ring hole (0.71×0.71×0.71nm) on the outer surface of the crystal. In contrast, ITQ-2 molecular sieve has two independent pore systems: a 10-membered ring two-dimensional sinusoidal channel system in the layer and a 12-membered ring hole (0.71×0.71×0.71nm) on the outer surface of the crystal. Disorder and short-range order. At the same ti...

Claims

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