ZSM-35 molecular sieve preparation method

A technology of ZSM-35 and molecular sieves, which is applied in the field of preparation of ZSM-35 molecular sieves, can solve the problems of increasing the difficulty of molecular sieve post-treatment, increasing production equipment, and increasing production costs, so as to reduce aggregation and carbon deposition, simplify production processes, The effect of improving catalytic performance

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the existing research reports on the preparation of ZSM-35 molecular sieves, small-grain ZSM-35 molecular sieves are mainly prepared by adding organic dispersants, surfactants or inorganic guides. These organic dispersants, surfactants or inorganic guides The p

Method used

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  • ZSM-35 molecular sieve preparation method

Examples

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Effect test

Embodiment 1

[0033] Step A: First, add 83 grams of aluminum sulfate (analytical pure, content greater than 99.5%) into 235 ml of deionized water under stirring at 25°C, and stir for 40 minutes. After the aluminum sulfate is completely dissolved, add 675 grams of silica sol (silica sol with a SiO2 content of 22.2%) and stir for 1 hour to form a mixed solution of silica and aluminum. 3 g of ZSM-35 seed crystals with a diameter of 300-800 nm and a thickness of less than 100 nm were added to the above mixed solution, and stirred at 80 rpm for 2 hours.

[0034] Step B: to the above-mentioned aluminum sulfate, silica sol (SiO 2 Content is 22.2% silica sol) and the mixed solution formed by the ZSM-35 molecular sieve seed crystal, slowly add 0.5mol / L sodium hydroxide aqueous solution 100ml, fully stir to form a colloidal solution. Add 75ml of cyclohexylamine as a template and 1.5g of the ZSM-35 seed crystal, and stir evenly to prepare a reaction mixture. This mixture has the following molar comp...

Embodiment 2

[0038] The steps are the same as in Example 1, except that the initial stirring temperature in step A is 50°C, the mass of the added ZSM-35 seed crystals is 5g, and the stirring condition is 95 rpm and stirring for 1.5 hours ; In step B, the quality of the ZSM-35 seed crystal added is 2.5g; The total weight of the ZSM-35 seed crystal added is based on SiO 2 5.0wt% of the total weight of the silicon source, the crystallization time in step C is 40h.

[0039] The molecular sieve obtained above is measured by X-ray diffraction and SEM, and it is confirmed that the molecular sieve synthesized by this method has a FER structure, is a ZSM-35 molecular sieve, and its crystallinity is 88%, and its grain diameter is 300~700nm, and the thickness is less than 100nm.

Embodiment 3

[0041] Step is the same as Example 1, except that the initial stirring temperature in step A is 40°C, the added silica sol (SiO 2 Silica sol with a content of 22.2%) is 337 grams, the quality of the added ZSM-35 seed crystal is 1.5 g, and the stirring condition is 95 rpm stirring for 1.5 hours; in step B, the added The mass of the ZSM-35 seed crystal is 0.75 g, and the mixture has the following molar composition: OH - : Al 2 o 3 : SiO 2 :R:H 2 O=0.4:0.1:1:0.6:27; in Step C, the temperature was raised to 200° C. under the stirring condition of 85 rpm, and the constant temperature crystallization was carried out for 40 h.

[0042] The molecular sieve obtained above is measured by X-ray diffraction and SEM, and it is confirmed that the molecular sieve synthesized by this method has a FER structure, is a ZSM-35 molecular sieve, and its crystallinity is 89%, and its grain diameter is 200~600nm, and the thickness is less than 100nm.

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Abstract

The present invention discloses a ZSM-35 molecular sieve preparation method, which comprises: A, mixing an aluminum source, a silicon source and a ZSM-35 crystal seed to obtain a mixture; B, respectively mixing the mixture with an alkali source, a templating agent, water and the ZSM-35 crystal seed to obtain a gel product; and C, carrying out crystallization on the gel product obtained in the step B to obtain the ZSM-35 molecular sieve product. According to the present invention, the preparation method is simple, the organic additive excluding the template in the preparation raw materials or the inorganic directing agent is not required to be added so as to eliminate the purification on the organic additive or the inorganic directing agent, simplify the production process, and reduces the production cost; and the small ZSM-35 molecular sieve grains with characteristics of high crystallinity degree, low grain diameter, low grain thickness and FER structure can be prepared.

Description

technical field [0001] The invention provides a method for preparing a ZSM-35 molecular sieve, in particular a method for preparing a simplified production process and low-cost small-grain ZSM-35 molecular sieve. Background technique [0002] ZSM-35 zeolite is a molecular sieve (US4, 016, 245) with a FER topology (US4,016,245) successfully developed by Mobil Corporation of the United States in the late 1970s. It has a vertically intersecting two-dimensional channel system. Among them, the channel size of the ten-membered ring parallel to the [001] plane is 0.42×0.54 nm; the size of the eight-membered ring channel parallel to the [010] plane is 0.35×0.48 nm. ZSM-35 molecular sieve is widely used in catalytic reactions of hydrocarbon conversion, such as isomerization, polymerization, aromatization and cracking of linear olefins, due to its unique vertically intersecting two-dimensional pore structure. [0003] The existing preparation method of ZSM-35 molecular sieve is usual...

Claims

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Application Information

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IPC IPC(8): C01B39/44
CPCC01B39/445C01P2002/72C01P2004/03C01P2004/20C01P2004/62
Inventor 任行涛栗同林裴庆君杨光张利霞伦志红刘艳惠
Owner CHINA PETROLEUM & CHEM CORP
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