Molecular sieve containing rare earth elements and preparation method thereof

A rare earth element and molecular sieve technology, which is applied in the field of preparation of molecular sieve catalytic materials, can solve the problems of high sodium oxide content, high production energy consumption, long exchange cycle and production process, etc.

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] The purpose of the present invention is to provide a rare earth element-containing molecular sieve and its preparation method in order to overcome the problems of high sodi

Method used

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  • Molecular sieve containing rare earth elements and preparation method thereof

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preparation example Construction

[0048] The first aspect of the invention provides a preparation method of molecular sieve containing rare earth elements, wherein the method comprises:

[0049] 1) Under microwave conditions, the sodium molecular sieve and the solution containing rare earth element ions are subjected to the first ion exchange reaction to obtain the molecular sieve after rare earth element ion exchange;

[0050] 2) Roasting the molecular sieve obtained in step 1) after ion exchange of rare earth elements to obtain the roasted molecular sieve;

[0051] 3) The molecular sieve calcined in step 2) is subjected to the second ion exchange reaction with the solution containing ammonium ions to obtain the molecular sieve containing rare earth elements.

[0052] The inventor of the invention found that, firstly, the sodium ions in the sodium molecular sieve are exchanged with rare earth elements under microwave conditions, and then the residual sodium ions in the molecular sieve are further exchanged with a...

Embodiment 1

[0086] 1) Mix NaY molecular sieve with aqueous solution containing lanthanum chloride and cerium chloride. The weight ratio of water to NaY molecular sieve is 20:1, and the weight ratio of total lanthanum chloride and cerium chloride to NaY molecular sieve is 0.8:1. Adjust the pH to 4.5 with dilute hydrochloric acid solution (concentration is 5 wt%). After that, the obtained mixture is placed under microwave conditions for the first ion exchange. The microwave conditions include: the frequency is 2450MHz, the microwave power is 1.5KW, the temperature is raised from 25 ℃ to 220 ℃, the microwave heating time is 5min, and it is maintained at the exchange temperature for 5min. After the exchange, the product was filtered, washed with 6 times the volume of deionized water, and then dried at 120 ℃ for 6h to obtain the molecular sieve after ion exchange of rare earth elements;

[0087] 2) Calcine the rare earth element ion exchanged molecular sieve obtained in step 1) at 550 ℃ for 3h to ...

Embodiment 2

[0091] 1) Mix NaY molecular sieve with aqueous solution containing lanthanum chloride and cerium nitrate. The weight ratio of water to NaY molecular sieve is 15:1, and the weight ratio of total amount of lanthanum chloride and cerium nitrate to NaY molecular sieve is 0.5:1. Adjust the pH to 4.5 with dilute hydrochloric acid solution (concentration is 5 wt%). After that, the obtained mixture is placed under microwave conditions for the first ion exchange. The microwave conditions include: the frequency is 2450MHz, the microwave power is 0.5KW, the temperature is raised from 25 ℃ to the exchange temperature 181 ℃, the microwave heating time is 5min, and it is maintained at the exchange temperature for 25min. After the exchange, the product was filtered, washed with 6 times the volume of deionized water, and then dried at 120 ℃ for 6h to obtain the molecular sieve after ion exchange of rare earth elements;

[0092] 2) Calcine the rare earth element ion exchanged molecular sieve obtai...

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Abstract

The invention relates to the field of preparation of molecular sieve catalytic materials, and discloses a molecular sieve containing rare earth elements and a preparation method thereof. The method comprises the following steps: 1) carrying out a first ion exchange reaction on a sodium molecular sieve and a solution containing rare earth element ions under a microwave condition to obtain a molecular sieve subjected to rare earth element ion exchange; 2) roasting the rare earth element ion-exchanged molecular sieve obtained in the step 1) to obtain a roasted molecular sieve; and 3) carrying out a second ion exchange reaction on the molecular sieve roasted in the step 2) and a solution containing ammonium ions to obtain the molecular sieve containing rare earth elements. The preparation method of the molecular sieve containing the rare earth elements is simple in technological process, and the prepared molecular sieve containing the rare earth elements is low in sodium oxide content and good in hydrothermal stability.

Description

technical field [0001] The invention relates to the preparation field of molecular sieve catalytic materials, in particular to a molecular sieve containing rare earth elements and a preparation method thereof. Background technology [0002] In industry, sodium molecular sieve is generally prepared by hydrothermal synthesis method. Generally, the cation of molecular sieve prepared by hydrothermal method is sodium ion, but in practical application, the sodium ion needs to be exchanged into other cations, such as hydrogen ion, potassium ion, rare earth metal ion, etc. [0003] Among them, Rey, REHY and REUSY molecular sieves obtained by Y-type molecular sieve and rare earth ion exchange modification are high active components of FCC catalyst. Rey molecular sieve (rare earth Y molecular sieve) was first developed and is also one of the main active components of the most important catalytic cracking catalyst with high activity, high stability and vanadium toxicity resistance. [0004]...

Claims

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Application Information

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IPC IPC(8): B01J29/08B01J29/40B01J29/70B01J37/30B01J37/34B01J37/10C10G11/05
CPCB01J29/087B01J29/088B01J29/405B01J29/7053B01J29/7057B01J37/30B01J37/346B01J37/10C10G11/05B01J2229/186B01J2229/24C10G2300/70C10G2400/02
Inventor 杨柳李腾飞任靖殷喜平周岩武永安李柯志赵保槐胡海强韩帅苏海霞张南
Owner CHINA PETROLEUM & CHEM CORP
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