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Beta-molecular sieve and preparation method thereof

A technology of β molecular sieve and silicon atom, which is applied in the field of β molecular sieve and its preparation, can solve the problems of low catalytic activity of the catalyst, influence on the framework structure of molecular sieve, reduce the crystallinity of molecular sieve, etc., and achieve high catalytic activity, isomerization ability and freezing point The effect of low and uniform skeleton silicon-aluminum structure

Active Publication Date: 2015-06-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

This method is to burn the original powder of β molecular sieve at high temperature to remove the template agent, which will affect the skeleton structure of the molecular sieve, greatly reduce the crystallinity of the molecular sieve, and also affect the acidity of the molecular sieve. The catalytic activity of the catalyst prepared by this method is not high. , the product quality of aviation fuel and diesel middle distillates still needs to be further improved

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  • Beta-molecular sieve and preparation method thereof
  • Beta-molecular sieve and preparation method thereof
  • Beta-molecular sieve and preparation method thereof

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preparation example Construction

[0030] The preparation method of β molecular sieve of the present invention comprises the following steps:

[0031] (1) Contact the original powder of β molecular sieve with normal pressure and dynamic water vapor, the contact temperature is 500~650℃, and the time is 5~10 hours;

[0032] (2) Contacting the product obtained in step (1) with ammonium fluorosilicate, then filtering, washing with water and drying to obtain β molecular sieve.

[0033] In step (1), the method of contacting the original powder of β molecular sieve with normal pressure and dynamic water vapor is preferably to place the original powder of β molecular sieve in a container, then introduce water vapor from one end of the container, and pass through the original powder of β molecular sieve from The other end of the container is drained. In order to make the molecular sieve treatment more uniform, it is best to place the molecular sieve in a rotating container such as a tube furnace. The water vapor enters...

Embodiment 1

[0098] Take the original powder of β molecular sieve (synthesized by hydrothermal method using tetraethylammonium hydroxide as template agent, the weight content of the template agent in the original powder of β molecular sieve is about 11.8%, provided by Sinopec Catalyst Fushun Branch), its chemical SiO 2 / Al 2 o 3 The molar ratio is 25.5, Na 2 O content is 2.45wt%, in its skeleton structure, through 29 Si MAS NMR spectrum, the distribution of silicon atoms in different coordination states is obtained as follows: Si (4Al) is 7.6%, Si (3Al) is 30.6%, Si (2Al) is 32.3%, Si (1Al) is 21.0% %, Si (0Al) is 8.5%. Take 1000g of the above-mentioned β molecular sieve raw powder, put it into a tube furnace, adopt the method of temperature program (heating rate is 100°C / hour), and start to introduce 100wt% water vapor when the temperature of the tube furnace rises to 300°C, water vapor The flow rate is 50L / hour, the tube furnace is heated to 550°C, and the constant temperature time ...

Embodiment 2

[0100] Get the former powder of β molecular sieve with embodiment 1. Take 1000g of the above-mentioned molecular sieve, put it into a tube furnace, adopt the method of temperature program (heating rate: 100°C / hour), and start to introduce 100wt% water vapor when the temperature of the tube furnace rises to 300°C, the flow rate of water vapor is 70L / hour, the tube furnace is heated to 600°C, and the constant temperature time is 8 hours. The obtained molecular sieve number is BS-2.

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Abstract

The invention discloses a beta-molecular sieve and a preparation method thereof as well as a hydrogenation catalyst containing the beta-molecular sieve. The beta-molecular sieve has the following properties: the molar ratio of SiO2 to Al2O3 is 30 to 150, the non-skeleton aluminum accounts for less than 2% of total aluminum, and the silicon atoms for coordination in a Si(0Al) structure accounts for more than or equal to 95% of the silicon atoms in the skeleton structure. The preparation method comprises the steps of connecting the raw powder of the beta-molecular sieve with normal-pressure dynamic vapor and then contacting with ammonium fluorosilicate. The beta-molecular sieve is suitable for serving as an acidic component in a diesel oil hydrogenation modification catalyst and a hydrogenation cracking catalyst.

Description

technical field [0001] The invention relates to a beta molecular sieve and a preparation method thereof. The β molecular sieve can be used as an active component of a hydrocracking catalyst, and can be used as an active component of a diesel hydrogenation upgrading catalyst. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, great flexibility of product schemes, high selectivity of target products, good product quality, and high added value. It can directly convert various heavy and low-quality raw materials into clean fuel oil and high-quality chemical raw materials , has become one of the most important heavy oil deep processing technologies in the modern oil refining and petrochemical industry, and has been increasingly widely used in countries all over the world. Hydrocracking technology has become the core technology of the combination of "oil-chemical-fiber" in the modern oil refining industry. Hydro...

Claims

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Application Information

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IPC IPC(8): C01B39/02B01J32/00B01J29/06B01J29/076B01J29/80C10G45/12C10G47/20
Inventor 刘昶王珂琦王凤来杜艳泽赵红关明华
Owner CHINA PETROLEUM & CHEM CORP
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