Olefin cracking catalyst resulting in high diesel oil yield and its prepn

Abstract

The olefin cracking catalyst resulting in high diesel oil yield contains phosphorus and RE compositely modified Y-zeolite, or named superstable RE Y-zeolite, in 5-45 wt%. The superstable RE Y-zeolite is prepared with Na zeolite as material and through RE exchange, the first roasting, reaction with RE, phosphorus containing matter and ammonium salt and the second roasting. The catalyst has the recommended components including superstable RE Y-zeolite 5-45 wt%, one or several kinds of other zeolite 0.5-30 wt%, clay 0.5-70 wt%, and high temperature resisting inorganic oxide 1.0-65 wt%, and contains phosphorus 0.3-2.5 wt% and RE oxide 1.5-6.0. The preparation process of the catalyst includes the mixing of the said components, homogenizing, spraying and post-treatment. The catalyst has powerful olefin cracking capacity, high diesel oil yield, low coke yield and powerful heavy oil cracking capacity.

Description

Technical field [0001] The invention relates to an olefin-reducing cracking catalyst capable of producing more diesel oil and a preparation method thereof, and more specifically, a catalyst for reducing olefin-reducing production of diesel oil suitable for a catalytic cracking process and a preparation method thereof. Background technique [0002] As many as 80% of the total domestic gasoline is cracked gasoline with olefin content between 40-60%, which is far from the new national standard (olefin content does not exceed 35v%), and the high olefin content in gasoline causes automobile exhaust One of the main reasons for high emissions. The development of cracking catalysts with strong olefin reduction capabilities has become the current focus of research in the field of catalysis. [0003] From the perspective of the international FCC catalyst market, the well-known AKZO catalyst company and GRACE company already have corresponding catalyst products. From the analysis of the obt...

AI Technical Summary

Problems solved by technology

CN1317547 discloses a method for producing active components of olefin-reducing catalysts, which is compounded with 0.5-5% ZSM-5, 0.5-15% rare earth Y zeolite and 2040% phosphorus and rare earth composite modified ultrastable Y zeolite, wherein phosphorus The rare earth content of Y zeolite compound modified with rare earth is 2-12%, the unit cell parameter is 2.445-2.465nm, and the phosphorus content is 0.2-3% (calculated as P). The method is to first carry out rare earth modification, and then carry out phosphorus modification Sexual treatment: CN1217231A discloses the preparation method of phosphorus-containing zeolite molecular sieve. The modified faujasite molecular sieve is impregnated with phosphorus-containing solution, dried, and roasted at 450-600°C for more than 0.5 hours. The catalyst containing this molecular sieve increases the yield of diesel oil. However, the effect of reducing gasoline olefins is not stated

[0005] To sum up, the olefin-reducing catalyst prepared by the prior art has a certain olefin-reducing ability, but the main disadvantages are high coke yield, low light oil yield, especially the obvious drop in diesel yield

The domestic situation is that the demand for diesel oil has increased significantly, and the supply of diesel oil is in short supply. The olefin-reducing catalyst developed by using the existing technology will undoubtedly aggravate the contradiction between supply and demand of diesel oil, and affect the economic benefits of the refinery.

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