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

Abstract

The invention discloses a phosphorus-containing and supported-metal-containing MFI structure molecular sieve and a preparation method thereof, wherein the n(SiO2) / n(Al2O3) of the molecular sieve is greater than 100, the phosphorus content of the molecular sieve is 0.1-5 wt%, the supported metal content of the molecular sieve is 0.5-5 wt%, the Al distribution parameter D (Al) of the molecular sieveis more than or equal to 0.6 and is less than or equal to 0.85, the volume of the mesopores of the molecular sieve accounts for 40-80% of the total pore volume, the volume of the mesopores with the pore size of 2-20 nm accounts for more than 90% of the total mesopore volume, the amount of the strong acid of the molecular sieve accounts for 60-80% of the total acid amount, and a ratio of the acidB to the acid L is 15-80. According to the present invention, with the catalyst or the auxiliary agent prepared by using the phosphorus-containing and supported-metal-containing MFI structure molecular sieve as the active component, the yield and the octane number of gasoline can be improved in the catalytic cracking reaction of petroleum hydrocarbons while the olefin content in gasoline can be effectively reduced.

Description

technical field [0001] The present disclosure relates to a phosphorus-containing and metal-supported MFI molecular sieve and a preparation method thereof. Background technique [0002] With the continuous upgrading of gasoline standards in my country, the control of olefin content in gasoline is becoming increasingly strict. The current National IV standard limits the olefin content of gasoline to a volume fraction of not higher than 28%, and the National V gasoline standard further reduces the olefin content to a volume fraction of not higher than 24%. In developed countries such as Europe and the United States, gasoline standards are more stringent on the olefin content. For example, the California 3 standard limits the gasoline olefin content to no more than 6% by volume, and the Euro 5 standard does not exceed 18%. [0003] FCC gasoline accounts for more than 60% of the gasoline pool in my country, and the high olefin content in FCC gasoline has become one of the bottle...

AI Technical Summary

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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