An aromatization catalyst and its preparation method, regeneration method and aromatization method

Abstract

The invention provides an aromatization catalyst and a preparation method, regeneration method and aromatization method thereof. The preparation method comprises mixing a zeolite molecular sieve and abinder to obtain a catalyst precursor, orderly performing ion exchange modification and first modification treatment on the catalyst precursor, and after hydrothermal treatment, carrying out active metal loading and second modification treatment to obtain the aromatization catalyst. A modification element used in the first modification is at least one selected from metals in the group IA, group VA and lanthanide line in the periodic table, the active metal is at least one element selected from elements in the group VIIB, group VIII, group IB and group IIB, and the modifying element used for the second modification is at least one element selected from elements in the group VA and lanthanide line in the periodic table. The aromatization catalyst has good carbon deposition resistance and high aromatization activity, can complete the aromatization reaction under mild conditions, and has high aromatic selectivity and a liquid yield of 98.5% or more.

Description

technical field [0001] The invention relates to the technical field of catalyst processing and regeneration, in particular to an aromatization catalyst and its preparation method, regeneration method and aromatization method. Background technique [0002] Proven oil resources around the world are becoming increasingly heavy, and the production of clean oil products is becoming more and more difficult. With the increasing impact of vehicle exhaust emissions on the atmospheric environment, countries around the world have increasingly stringent requirements on the quality of gasoline for vehicles. . From January 1, 2019, my country plans to implement the National VI Motor Gasoline Standard, which sets stricter regulations on indicators such as sulfur content and olefin content. [0003] In my country's gasoline pool, catalytic cracking gasoline accounts for as much as 75%. At the same time, because catalytic cracking gasoline (FCC gasoline) has the composition characteristics ...

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Problems solved by technology

However, the additive modification and active metal loading it implements are all aimed at the aromatization of raw materials with high alkane content, and the effect on the aromatization of olefins is general

[0009] In addition, the aromatization catalysts recorded in other literatures are generally difficult to balance the liquid yield and the selectivity of olefins to aromatics. Usually, the liquid yield can reach 60-70%. In order to pursue high selectivity performance, often at the expense of liquid yield

In actual production, the above-mentioned liquid yield will inevitably cause a large amount of oil loss, seriously affecting the production and economic benefits of the enterprise, which is also one of the factors that currently limit the practical application of aromatization catalysts

Moreover, the catalytic activity of the existing aromatization catalysts is relatively low, and generally the aromatization reaction needs to be completed at 450°C or even higher temperature. temperature means that a large energy consumption

At the same time, the service life of most aromatization catalysts is short, so the adaptability to industrial scale-up is poor, which further restricts the application of aromatization catalysts

So far, there is no good aromatization catalyst that overcomes the above-mentioned multiple deficiencies at present.

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