A kind of porous catalytic material and preparation method thereof

Abstract

A kind of porous catalytic material, it is characterized in that, the XRD spectrogram of this catalytic material is 25 °~27 ° of 2θ angles to appear a diffuse diffraction peak, there is FAU crystal phase structure simultaneously, its chemical composition contains , 50-80% silicon and 20-50% aluminum, total specific surface area≯250m 2 / g, the ratio of the micropore specific surface area to the total specific surface area≯28%, the ratio of the number of B acid sites to the number of L acid sites measured by pyridine infrared at 200°C is ≥0.30; when the surface Al / Si measured by XPS method When the atomic ratio is a, and the bulk Al / Si atomic ratio measured by the XRF method is b, a / b=1.1˜1.6.

Description

technical field [0001] The invention relates to a porous catalytic material and a preparation method thereof, and further to a multi-structure porous catalytic material and a preparation method thereof. Background technique [0002] As an important reaction process in petroleum refining and processing, fluid catalytic cracking has been widely used in petroleum processing industry and plays a pivotal role in refineries. In the process of catalytic cracking reaction, heavy distillate such as vacuum distillate oil or residue oil of heavier components undergoes cracking reaction in the presence of catalyst, and is converted into liquid cracking products such as gasoline and diesel oil and lighter gaseous cracking products. Catalytic cracking reaction Generally follow the carbocation reaction mechanism, so it is usually necessary to use catalytic materials with higher acidity, especially Bronsted acid centers, in the reaction process. [0003] Zeolite molecular sieve is a kind o...

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Problems solved by technology

[0013] However, in the existing technology, the silicon content in the crystallization mother liquor of NaY molecular sieve and the washing filtrate is very different, especially in the washing filtrate, the silicon content will gradually decrease with the increase of the number of washing stages. At the same time, a certain proportion of molecular sieve microcrystals may be formed during the crystallization process of NaY molecular sieves. These microcrystals have a small particle size and can easily penetrate the filter device and enter the filtrate. In the process, the concentration of suspended solids in the washing filtrate will increase. In order to avoid the formation of miscellaneous crystals caused by the re-entry of molecular sieve microcrystals into the synthesis system during the recycling process, the filtrate usually needs to be settled and slag-cut, which greatly increases the amount of filtrate and waste residue. processing fee

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