Preparation method for middle distillate-type hydrocracking catalyst

A hydrocracking and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as insufficient catalyst stability and unstable properties of heteropolyacids

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the properties of heteropolyacids are unstable, and they will gradually decompose and transform under high temperature conditions, and the stability of the catalyst is insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare an ammonium dihydrogen phosphate solution with a weight concentration of 30%, impregnate the above-mentioned dried carrier T-1 with the prepared phosphorus-containing solution for 2 hours, dry at 120°C for 4 hours, and then use the impregnation solution containing tungsten and nickel Immerse at room temperature for 2 hours, dry at 120°C for 4 hours, heat treat at 250°C for 6 hours in an air atmosphere, and then reductively activate in a hydrogen atmosphere. The rate is 2°C / min, the temperature is raised from 450°C to 700°C, and the temperature is kept at 700°C for 2 hours to prepare the catalyst C-1 of the present invention.

Embodiment 2

[0043] Prepare an ammonium dihydrogen phosphate solution with a weight concentration of 40%, impregnate the carrier T-2 of Comparative Example 2 with the prepared phosphorus-containing solution for 2 hours, dry at 120°C for 5 hours, and then use the impregnating solution containing tungsten and nickel Immerse at room temperature for 2 hours, dry at 100°C for 6 hours, heat treat at 400°C for 1 hour in an air atmosphere, and then perform hydrogen activation under a hydrogen atmosphere. The temperature is 1°C / min, raised from 350°C to 600°C, and kept at 600°C for 4 hours to prepare transition metal phosphide catalyst C-2.

Embodiment 3

[0048] Prepare a solution of ammonium dihydrogen phosphate with a concentration of 60%, impregnate the carrier T-3 of Comparative Example 3 with the prepared phosphorus-containing solution for 2 hours, dry at 110°C for 5 hours, and then use the impregnating solution containing tungsten and nickel at room temperature Immerse for 2 hours, dry at 110°C for 6 hours, heat treat at 350°C for 2 hours in air atmosphere, and then perform activation treatment in hydrogen atmosphere, first increase from room temperature to 450°C at 8°C / min, with a heating rate of 1 °C / min, rising from 450 °C to 650 °C, and keeping the temperature at 650 °C for 4 hours to prepare transition metal phosphide catalyst C-3.

[0049] Table 1 Physicochemical properties of catalyst supports.

[0050] serial number T-1 T-2 T-3 Molecular sieve, wt% 12.0 7.0 4.0 Amorphous silica-alumina, wt% 25.0 53.0 30.0 Macroporous alumina, wt% 43.0 20.0 46.0 Binder, wt% 20.0 20.0 20...

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Abstract

The present invention discloses a preparation method for a middle distillate-type hydrocracking catalyst. The method of the present invention includes the following processes: (1) preparing a catalyst carrier containing zeolite(s) and an inorganic refractory oxide(s); (2) preparing a phosphorus-containing compound solution, dipping the catalyst carrier obtained in step (1), and then drying the carrier; (3) preparing a VIB group metal compound and VIII group metal compound-containing dipping solution; (4) dipping the materials obtained in step (2) in the dipping solution prepared in step (3), and then drying; (5) performing a heat treatment in the air atmosphere to the materials obtained in step (4); and (6) activating the materials obtained in step (5) after the heat treatment by using hydrogen, and obtaining the hydrocracking catalyst used for the hydrocracking reaction after the activation. The hydrocracking catalyst prepared by the method of the present invention has more prominent usability, and is particularly applicable to the hydrocracking process for maximum production of middle distillates.

Description

technical field [0001] The invention relates to a method for preparing a hydrocracking catalyst. The catalyst has excellent hydrocracking performance, high activity and high selectivity for medium oil. Background technique [0002] The hydrocracking catalyst is a dual-functional catalyst with hydrogenation and cracking properties. Non-precious metal hydrocracking catalysts generally use Group VIB and Group VIII metals as hydrogenation components, and the cracking performance is mainly provided by acidic components. Crystalline zeolite and / or amorphous silica-alumina can be used. Simple use of amorphous silica-alumina, although the selectivity is high, but the activity is low, and the flexibility of operation is limited. In most hydrocracking catalysts, crystalline zeolite is used as the acidic component, or crystalline zeolite and amorphous Silica and aluminum are common acidic components. [0003] Most of the medium-oil hydrocracking catalysts currently used in industrial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/26B01J29/78C10G47/20
Inventor 谷明镝黄薇
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