Porous catalytic material and preparation method

Abstract

Provided is a porous catalytic material. The porous catalytic material has the characteristics that in the XRD spectrum of the catalytic material, a dispersed diffraction peak is shown at a 2theta angle of 25-27 degree, and meanwhile the catalytic material has an FAU crystal phase structure; the chemical composition of the porous catalytic material contains 50-80% of silicon and 20-50% of aluminumby weight of oxides, the total specific surface area is not more than 250 m<2>/g, the ratio of the micropore specific surface area to the total specific surface area is not more than 28%, and the ratio, measured through pyridine-IR at 200 DEG C, of the number of B acid centers to the number of L acid centers is not less than 0.30; and when the surface Al/Si atomic ratio measured by using an XPS method is a, and the bulk-phase Al/Si atomic ratio measured by using an 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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