A kind of sapo-34 and eu-1 composite molecular sieve and its synthetic method

Abstract

The invention provides an SAPO-34 / EU-1 composite molecular sieve. The SAPO-34 / EU-1 composite molecular sieve has the following two crystal forms at the same time: an EU-1 molecular sieve and an SAPO-34 molecular sieve. The synthetic method for the SAPO-34 / EU-1 composite molecular sieve provided by the invention comprises the following steps: adding the EU-1 molecular sieve into a glucose solution for ultrasonic treatment and carrying out filtering, drying and roasting so as to obtain a treated EU-1 molecular sieve; then mixing water, an alkali source, a template agent, an aluminum source and a silicon source with the treated EU-1 molecular sieve; and carrying out crystallization at a temperature of 150 to 240 DEG C for 15 to 100 h so as to obtain the SAPO-34 / EU-1 composite molecular sieve. According to the invention, glucose is introduced into the pores of the EU-1 molecular sieve and becomes carbon after roasting; the carbon occupies the pore channels of the EU-1 molecular sieve to prevent alkali from entering the interior of EU-1 molecular sieve crystals, so the EU-1 molecular sieve is not destroyed in the process of crystallization and the integrity of crystal structure is maintained, which are beneficial for improvement of the physical and chemical properties and the catalytic activity of the SAPO-34 / EU-1 composite molecular sieve.

Description

technical field [0001] The invention belongs to the field of synthesis of molecular sieve catalytic materials, in particular to a SAPO-34 / EU-1 composite molecular sieve and a synthesis method thereof. Background technique [0002] Composite molecular sieve is a composite molecular sieve with a special structure, which is a co-crystal formed by two or more molecular sieves, or a composite crystal with the structural characteristics of two or more molecular sieves. Due to the particularity of the composite molecular sieve structure, this molecular sieve has a more reasonable distribution of acidity and good hydrothermal stability, overcomes the limitations of its components, better meets the needs of industrial applications, and has a wide range of applications. Application prospect. [0003] At present, there are many technologies about composite molecular sieves. For example, CN101279288A discloses a synthesis method and application of a core-shell structure composite molec...

AI Technical Summary

Problems solved by technology

[0013] However, there are still many defects and deficiencies in the synthesis technology of composite molecular sieves, which cause some deficiencies in the physical and chemical properties of composite molecular sieves.

For example, the composite structure of composite molecular sieves is not easy to control, and the acid properties are also difficult to adjust.

Moreover, many composite molecular sieves are synthesized by a two-step method, which easily causes damage to the first component during the compounding process, which reduces the physical and chemical properties of the composite molecular sieve, thereby affecting the adsorption and catalytic performance.

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