Molecular sieve containing rare earth elements and preparation method thereof

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]...

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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 sodium oxide content, long exchange cycle and production process, and high production energy consumption in the molecular sieve containing rare earth elements existing in the prior art

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