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 molecular sieve and a preparation method thereof, wherein the n(SiO2) / n(Al2O3) of the molecular sieve is greater than100, the phosphorus content of the molecular sieve is 0.1-5 wt%, the supported metal content of the molecular sieve is 0.1-5 wt%, the Al distribution parameter D (Al) of the molecular sieve is 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 acid B 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 asthe active component, the yield of gasoline in the catalytic cracking reaction of petroleum hydrocarbons can be maintained while the octane number of gasoline can be effectively increased, or the octane value of gasoline can be maintained while the yield of gasoline is improved.

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] In recent years, the number of domestic motor vehicles has continued to grow, supporting the strong demand for domestic gasoline terminal consumption. It is expected that during the "Twelfth Five-Year Plan" period, the average annual growth rate of automobile sales will be 11%, driving the demand for gasoline to maintain a steady growth rate of 5% per year. 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. With global propylene capacity forecast to increase by 30Mt over the next five years, while demand growth is expected to be only 22Mt, this gap between supply and demand could lead to lower propylene prices. [0003] Driven by market demand and economic benefits, oil refiner...

AI Technical Summary

Problems solved by technology

As mentioned above, the synthesis of molecular sieves with high silicon-aluminum ratio is difficult to be popularized and applied in catalytic cracking catalysts due to production costs, environmental pollution, and poor hydrothermal stability caused by fine grains.

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