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High temperature hydrothermal stability REHY molecular sieve, preparation method and applications thereof

A high-temperature hydrothermal and molecular sieve technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as the decline in structural performance of Y molecular sieves, the decrease in the crystallinity of Y molecular sieves, and the difficulty of energy consumption.

Active Publication Date: 2013-08-28
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method of reducing the Na content in Y molecular sieve at home and abroad is to reduce the Na content in Y molecular sieve by increasing the number of exchanges and roasting when preparing HY, but the crystallinity of Y molecular sieve will decrease in the direct roasting process after the exchange. , thus reducing the structural performance of Y molecular sieve; another method by applying an applied voltage can maintain a certain degree of crystallinity and reduce the Na content of Y molecular sieve, but the loss of energy increases the difficulty of industrial promotion

Method used

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  • High temperature hydrothermal stability REHY molecular sieve, preparation method and applications thereof
  • High temperature hydrothermal stability REHY molecular sieve, preparation method and applications thereof
  • High temperature hydrothermal stability REHY molecular sieve, preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Prepare the solution

[0030] NH 4 NO 3 The solution is 1mol / L; 0.2678mol / L La(NO 3 ) 3 400ml and 3.116mol / L Ce(NO 3 ) 3 51.57ml mixed and diluted into 1L rare earth mixed solution, molar ratio La: Ce=4:6;

[0031] (2) Ion exchange

[0032] 100g NaY and 1L NH 4 NO 3 The solution was placed in a three-necked flask with a volume of 3 L, heated and stirred at 90±2°C for ammonium exchange for 4 hours to obtain NH 4 Y, suction filtered and crushed into powder;

[0033] (3) drying

[0034] NH 4 Y was dried at 90°C for 2 hours, further crushed into fine powder, dried at 140°C for 4 hours, and stirred from time to time to fully remove the moisture;

[0035] (4) step-by-step programmed temperature rise roasting

[0036] NH 4 Y was calcined at 450°C for 1 hour, then programmed to heat up to 550°C within 2 hours and then calcined slowly, and then calcined at 550°C for 1 hour to obtain cross-roasted HY, which was stored in an oven at 60-90°C to prevent water absor...

Embodiment 2

[0042] Others are basically the same as in Example 1, only the rare earth mixed solution is diluted to 1L with 22.2ml of the rare earth mixed solution in Example 1, and then ion-exchanged with 100g of four-cross-four-baked HY, dried and roasted at 550°C for 4h to obtain REHY molecular sieve B .

Embodiment 3

[0044] Others are basically the same as in Example 1, only the rare earth mixed solution is diluted to 1L with 55.6ml of the rare earth mixed solution in Example 1, and then ion-exchanged with 100g of four-cross-four-baked HY, dried and roasted at 550°C for 4 hours to obtain REHY molecular sieve C .

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Abstract

The present invention discloses a high temperature hydrothermal stability REHY molecular sieve preparation method, which comprises: adopting NaY as a raw material, carrying out ammonium exchange, adopting step-by-step programmed temperature increase calcination, repeating the exchange and the calcination 4 times to obtain HY, and carrying out rare earth modification on the HY to obtain the molecular sieve. The method has characteristics of simple process, energy source saving and easy promotion. The obtained REHY molecular sieve has advantages of low Na content, high hydrothermal stability, high acid content, large specific surface and the like, has a high catalysis cracking performance in a catalytic cracking reaction, and has wide application prospects.

Description

technical field [0001] The invention belongs to a REHY molecular sieve suitable for catalytic cracking reaction, in particular to a high-temperature hydrothermally stable REHY molecular sieve and its preparation method and application. Background technique [0002] In recent years, REHY has become an important catalyst for the petrochemical industry. The distribution of rare earth ions in the Y molecular sieve affects the structural properties of the molecular sieve, and the location of the Y molecular sieve β cage S I The rare earth ions at the ' position can enhance the structural properties of Y molecular sieves, and the positioning of rare earth ions is closely related to the Na content in Y molecular sieves. The less Na content in Y molecular sieves, the more favorable the positioning of rare earth ions in Y molecular sieves. [0003] The method of reducing the Na content in Y molecular sieve at home and abroad is to reduce the Na content in Y molecular sieve by increa...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J29/08
Inventor 滕灼光李斌靳广洲
Owner GUANGXI UNIV
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