Hydrocracking catalyst and preparation method thereof

A hydrocracking and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalyst, organic compound/hydride/coordination complex catalyst, etc. The probability of secondary cracking reaction increases, etc., to achieve the effects of improved C5+ selectivity, high thermal stability, and structure determination.

Inactive Publication Date: 2009-12-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrocracking catalyst containing molecular sieve has the advantages of strong acidity and large specific surface, but its disadvantage is that the small pore size of molecular sieve increases the diffusion resistance of reactants and products, and the probability of secondary cracking reaction increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: first make 200ml concentration be 0.03mol L ～1 cesium carbonate solution, 180ml concentration is 1mol L ～1 The concentration of nickel nitrate solution and 120ml is 3mol·L ～1 citric acid solution to prepare a mixed solution, then add 36g of phosphotungstic acid, stir at 70°C until gelatinized, and dry at 120°C for 18min. Dry the dried solid in a muffle furnace at 6°C min ～1 The speed is increased to 350 ° C, and the temperature is kept for 4 hours to prepare Ni and CsH 2 PW 12 o 40 Catalyst with a molar ratio of 15.

[0018] Put the catalyst into the reaction tube, feed hydrogen, and the volume space velocity is 1500h ～1 , the pressure of the reaction system is gradually increased to 2.0MPa. After checking that there is no air leakage, the temperature of the reaction system is raised to 300°C, and the heating rate is 2°C·min ～1 , kept for 1h, at a stable hydrogen volumetric space velocity of 1500h ～1 Down cut into n-decane, its mass space velocity ...

Embodiment 2

[0019] Embodiment 2: the mixed solution is changed from 210ml concentration to 0.03mol L ～1 Cesium carbonate solution, 150ml concentration is 1mol L ～ 1 The concentration of nickel nitrate solution and 100ml is 3mol·L ～1 prepared from a citric acid solution. Add 38g phosphotungstic acid then, all the other are with embodiment 1, Ni and CsH in the gained catalyst 2 PW 12 o 40 The molar ratio was 12.

[0020] The evaluation of the catalyst is the same as in Example 1, and the results of the conversion rate and the selectivity of cracked products are shown in Table 1.

Embodiment 3

[0021] Embodiment 3: 170ml concentration is 0.03mol L ～1 cesium carbonate solution, 250ml concentration is 1mol L ～1 The concentration of nickel nitrate solution and 170ml is 3mol·L ～1 citric acid solution to prepare a mixed solution, then add 31g of phosphotungstic acid, stir at 70°C until gelling, and dry at 150°C for 12min. Dry the dried solid in a muffle furnace at 6°C min ～1 The speed is raised to 300°C, and the temperature is kept constant for 6h to prepare Ni and CsH 2 PW 12 o 40 Catalyst with a molar ratio of 24.

[0022] The evaluation of the catalyst is the same as in Example 1, and the results of the conversion rate and the selectivity of cracked products are shown in Table 1.

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PUM

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Abstract

The invention discloses a hydrocracking catalyst and a preparation method thereof, which relate to a hydrocracking catalyst, in particular a hydrocracking catalyst for long-chain alkane. The invention provides a hydrocracking catalyst with high selectivity and a preparation method thereof. The hydrocracking catalyst comprises an acidic component and a hydrogenation component, wherein the acidic component is cesium phosphotungstate, the hydrogenation component is nickel, and the mole ratio of the hydrogenation component to the acidic component is between 8 and 24. The preparation method comprises the following steps: mixing a water-soluble cesium salt, a water-soluble nickel salt and a complexing agent to prepare mixed solution according to the mole ratio of 1:(8-48):(16-96); adding phosphotungstic acid to the mixed solution according to the mole ratio of the cesium salt to the phosphotungstate acid being 1:(0.5-1); and stirring the mixture until glue is formed; drying and baking the glue to prepare the hydrocracking catalyst. The conversion ratio obtained when the catalyst is applied to a hydrocracking reaction and the C5 selectivity of a cracked product reach more than 80 percent. Compared with other catalysts, the hydrocracking catalyst improves the C5 selectivity obviously under the same reaction condition.

Description

technical field [0001] The invention relates to a catalyst, especially a hydrocracking catalyst for long-chain alkanes. Background technique [0002] In the oil refining industry, hydrocracking is an important process for producing high-quality light oil products from heavy oil. A transformation process of chemical reactions such as depletion and cracking. The hydrocracking process can not only produce high-quality light oil products, but also has a high yield of liquid phase products. The core of hydrocracking technology is the catalyst, and the hydrocracking catalyst is a dual-function catalyst, which has both acidic function and hydrogenation function. The acid function of the hydrocracking catalyst involved in US 5,536,687, US 5,447,623 and European EP 0028938A1 is mainly provided by molecular sieves, and the hydrogenation component is selected from Mo~Ni or W~Ni; the phosphorus-containing tungsten involved in CN100450612C Heteropolyacid or silicotungstic heteropolyac...

Claims

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Application Information

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IPC IPC(8): B01J31/28B01J31/18B01J37/00C10G47/02
Inventor 方维平金浩伊晓东孙晓丹翁维正万惠霖
Owner XIAMEN UNIV
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