A kind of phosphorus-containing MFI structure molecular sieve and preparation method thereof

Abstract

The invention discloses a phosphorus containing MFI structure molecular sieve and a preparation method of the molecular sieve. According to the phosphorus containing MFI structure molecular sieve, n(SiO2) / n(Al2O3) is larger than 100; with P2O5 for calculation and the dry basis weight of the molecular sieve being a reference, the phosphorus content of the molecular sieve is 0.1-5wt%; the Al distribution parameter D of the molecular sieve meets the equation of 0.5<=D<=0.8; the proportion of the medium pore volume to the total pore volume of the molecular sieve is 15-30vt%; the proportion of the strong acid amount to the total acid amount of the molecular sieve is 60-80%, and the ratio of the amount of acid B to the amount of acid L is 20-100. The phosphorus containing MFI structure molecular sieve serves as an active component for preparing catalysts or auxiliaries, and in a petroleum hydrocarbon catalytic cracking reaction, the gasoline octane value can be effectively increased while the gasoline yield is kept, or the gasoline yield is increased while the gasoline octane value is kept.

Description

technical field [0001] The invention relates to a phosphorus-containing MFI structure molecular sieve and a preparation method thereof. Background technique [0002] In recent years, the number of domestic motor vehicles has continued to rise, supporting the strong demand for domestic gasoline terminal consumption. It is expected that during the "Twelfth Five-Year Plan" period, the production, sales and ownership of motor vehicles will continue to grow, and the demand for gasoline will maintain an upward trend. During the "Twelfth Five-Year Plan" period, the average annual growth rate of automobile sales is 11%, driving the demand for gasoline to maintain an average annual growth rate of 5%. It is estimated that the apparent consumption of gasoline will reach 98Mt by 2015. With a new round of dedicated propylene capacity coming on stream, global propylene supply will significantly outpace expected demand growth over the next five years. It is predicted that global propylen...

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Problems solved by technology

[0013] In the prior art, the direct synthesis of high silicon-aluminum ratio ZSM-5 molecular sieves requires the use of expensive templates, which is costly, difficult to produce, and high waste discharge, and the synthesized ZSM-5 molecular sieves usually have finer crystal grains (100~ 300nm), poor hydrothermal stability, difficult to popularize and apply in catalytic cracking catalyst

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