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Modified molecular screen base precious metal diesel oil deepness hydrogenation dearomatization catalyst and method of preparing the same

A deep hydrogenation, molecular sieve-based technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, hydrogenation and refining of aromatics, etc., can solve the problem of secondary cracking reaction products, etc.

Active Publication Date: 2008-09-03
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0009] The above-mentioned patented catalysts are mainly aimed at the hydrocracking process of heavy distillate oil or the aromatics saturation process at low temperature. They are applied to the deep dearomatization and selective ring-opening process of diesel oil. The common disadvantage is that the molecular sieve used is a microporous molecular sieve with a small pore size. Therefore, the available pores in the zeolite are less, the acidity is strong, and the cracking performance of the catalyst is strong. As a result, when the catalyst is used in the deep dearomatization process of diesel oil, there are many secondary cracking reaction products and the loss of diesel yield is obvious.

Method used

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  • Modified molecular screen base precious metal diesel oil deepness hydrogenation dearomatization catalyst and method of preparing the same
  • Modified molecular screen base precious metal diesel oil deepness hydrogenation dearomatization catalyst and method of preparing the same
  • Modified molecular screen base precious metal diesel oil deepness hydrogenation dearomatization catalyst and method of preparing the same

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Embodiment Construction

[0017] The technical characteristics of the present invention will be described in detail below in conjunction with specific embodiments.

[0018] (1) The preparation process of the catalyst

[0019] 100 grams of HY molecular sieves obtained by ion exchange were placed in 500 mL of 0.2 mol / L NH 4 In the F aqueous solution, stir at room temperature for 1 hour, filter, dry at 120°C, and impregnate the sample calcined at 450°C in an equal volume of 5% SiO 2 in a silica sol solution, dried at 120°C, and then calcined in a muffle furnace at a temperature programmed to 750°C for 4 hours to obtain a modified molecular sieve.

[0020] Impregnate active components and auxiliary components by step-by-step impregnation, let stand for 24 hours, dry naturally, dry at 120°C, and roast at 400°C to obtain Pt-Pd-Cr / HY-γ-Al 2 o 3 catalyst. Wherein the total content of precious metals is 1.0%, Pd / Pt is 4 / 1, and Cr is a co-catalyst with a content of 0.6%.

[0021] (2) Pore structure paramete...

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Abstract

The invention discloses a modified molecular sieve-based noble metal catalyst for deep hydrodearomatization of diesel and the preparation method thereof. The catalyst is suitable for hydrodearomatization of the FCC diesel, particularly suitable for deep hydrodearomatization of diesel after hydro-upgrading of the FCC diesel. The dearomatized diesel can be used as a blend component of high-quality diesel. The catalyst contains modified HY molecular sieve as carriers and noble metals such as Pt, Pd and Ir as active components. The industrialized HY molecular sieve is modified to have microporous-mesoporous structure, and the carrier has medium acidity and is doped with Cr, Zn, Sn and Mo oxides of the active components with ring-opening selectivity, so that the inventive catalyst is characterized in deep cracking inhibition and ring-opening selection. The catalyst is used in the deep hydrodearomatization of the second stage in the two-stage hydro-upgrading of diesel.

Description

technical field [0001] The invention relates to a modified molecular sieve-based precious metal diesel deep hydrogenation dearomatization catalyst and a preparation method thereof. The method belongs to the catalytic diesel hydrofinishing technology in the production process of clean oil products, and is mainly used for the preparation of molecular sieve-supported precious metal catalysts for deep dearomatization and selective ring-opening reaction of FCC diesel hydro-upgraded products. Background technique [0002] FCC diesel is the main source of diesel for vehicles. FCC diesel contains a large amount of sulfur, nitrogen and aromatics. At present, sulfur and nitrogen can be removed by traditional supported metal sulfide catalysts. The technical difficulty is the removal of aromatics. The high aromatics content in diesel brings many problems, such as the increase of aromatics in diesel will not only reduce oil quality and cetane number, but also increase particulate emissi...

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Application Information

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IPC IPC(8): B01J29/16C10G45/54C10G45/64
Inventor 柳云骐刘晨光于建宁刘平刘春英李清华
Owner BC P INC CHINA NAT PETROLEUM CORP
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