FCC (Fluid Cracking Catalyst) catalyst containing silicon binder and preparation method thereof

Abstract

The invention provides a preparation method of an FCC (Fluid Cracking Catalyst) catalyst containing a silicon binder. The method comprises the following steps: mixing and pulping clay, molecular sieve slurry, pseudo-boehmite, hydroxyl aluminum chloride (alumina sol) and a silica sol binder to prepare catalyst slurry; then, spraying and drying the catalyst slurry; then, washing and drying the catalyst slurry to obtain a catalyst product. The method is characterized in that three binders pseudo-boehmite, alumina sol and silica sol serve as a compound binder, and the use level of silica sol can be regulated in a larger amplitude, thereby, providing an effectively method for preparing an alumino silica gel FCC catalyst. The catalyst prepared by the method provided by the invention has the characteristics of good strength, strong heavy oil cracking capacity, high light liquid yield and the like.

Description

technical field [0001] The invention relates to a fluid catalytic cracking (FCC) catalyst and a preparation method thereof, in particular to a silicon binder-containing FCC catalyst and a preparation method thereof. Background technique [0002] The fluid catalytic cracking (FCC) process has always been the most important means of secondary processing of crude oil. The preparation methods of FCC catalysts corresponding to this process mainly include total synthesis, semi-synthesis and in-situ crystallization. The so-called total synthesis means that the catalysts are all synthesized from chemical raw materials such as water glass and aluminum sulfate; The active component and matrix material are simultaneously prepared by a one-step method, and then the kaolin-type FCC catalyst is prepared through modification treatment. Among them, kaolin is used as filler, molecular sieve is used as active component, and various silicon / aluminum colloids are used as binder. Due to its sim...

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Problems solved by technology

[0005] Due to its good coke selectivity, silicon binder catalysts have occupied a very important position in the market for a long time. Its disadvantage is that the prepared catalysts are not as strong as aluminum-based catalysts, especially aluminum sol catalysts.

Such as USP4010116 discloses a kind of preparation method of FCC catalyst, this method proposes to do binder with pseudo-boehmite in peptized state, the prepared catalyst has higher strength and hydrothermal stability, but peptized pseudo-boehmite is thin The diaspore binder can no longer meet the strength requirements of FCC catalysts with high molecular sieve content

The preparation method of the disclosed FCC catalyst of USP4542118 is to make the binding agent with better aluminum hydroxychloride (aluminum sol) of bonding performance, to improve the anti-wear property of catalyst, but, because aluminum sol itself is inert, its preparation The FCC catalyst has low activity and limited ability to crack large molecules

CN1098310A has proposed the method that adopts the composite binder that aluminum-containing sol and pseudo-boehmite are formed to prepare FCC catalyst, and the performance of catalyst has been further improved, but the cracking activity of this carrier and the cracking ability to macromolecule are still limited

The content of molecular sieve in the above method is generally about 25m%, and SiO in the sodium-containing silica sol 2 The highest concentration is only 10m%, which makes the solid content of the catalyst slurry lower, the production energy consumption is large, the output is low, and the cost is high

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