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Catalyst in regular structure and its preparing method

A technology of regular structure and catalyst, applied in the field of catalyst and its preparation, can solve the problem of low selectivity of catalytic activity, and achieve the effects of high reaction activity, promotion of conversion and improvement of selectivity

Active Publication Date: 2007-06-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of regular structure catalyst with higher catalytic activity selectivity in order to overcome the shortcoming of low selectivity of catalyst catalytic activity in the prior art

Method used

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  • Catalyst in regular structure and its preparing method
  • Catalyst in regular structure and its preparing method
  • Catalyst in regular structure and its preparing method

Examples

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preparation example Construction

[0036] The preparation method of the catalyst of the present invention may also include drying and calcining the prepared active component layer catalyst having a gradient distribution. The drying temperature is preferably 90-130°C, and the drying time is preferably 3-10 hours, more preferably the drying temperature is 110-120°C, and the drying time is 5-7 hours.

[0037] According to the present invention, surfactants may also be loaded onto the aforementioned active components and / or carriers prior to coating. The surfactant is preferably a nonionic surfactant, which refers to a surfactant that does not generate ions in water and has active groups such as polyhydroxyl or polyoxyethylene groups in the molecule. The active agent is relatively stable to acid and alkali, and mainly includes polyol type and polyoxyethylene type. Preferred nonionic surfactants are selected from one or more of polyethylene glycol, glycerol, carboxymethylcellulose, polyvinyl alcohol or polyacrylic ...

Embodiment 1

[0042] This example is used to illustrate the gradient structured catalyst provided by the present invention.

[0043] Stir pseudoboehmite, ferric chloride, cerous chloride, and lanthanum chloride in deionized water evenly, adjust the pH to 10.5 with sodium bicarbonate, stir at a constant temperature of 80°C for 110 minutes, and filter and wash until the water content is 70% by weight of the wet cake was used.

[0044] HZSM-5 molecular sieve (SiO 2 / Al 2 o 3 100, the sodium oxide content is 0% by weight) mixed with deionized water, stirred and homogenized for 30 minutes at 80° C. to obtain a uniform slurry, and 70% by weight of the slurry was taken out. The remaining slurry was adjusted to pH=4 with citric acid, then mixed with the taken out slurry and wet filter cake, stirred at 80°C for 70 minutes, baked at 130°C for 4 hours, and calcined at 850°C for 6 hours to obtain the active group point. The addition amount of HZSM-5 molecular sieve, pseudo-boehmite, ferric chlorid...

Embodiment 2

[0047] This example is used to illustrate the gradient structured catalyst provided by the present invention.

[0048] The regular structure catalyst is prepared according to the method of Example 1, the difference is that the carrier with the regular structure is the foamed alumina (200 / 0.33) provided by Shanghai Taishan Refractory Material Factory, the cross-sectional hole density is 31 holes / square centimeter, the The cross-sectional area is 2.0 square millimeters), the high-pressure air for purging is air with a pressure of 7 MPa and a flow rate of 20 liters / min, and the purging time is 5 minutes. In the obtained gradient regular structure catalyst, the axial gradient formed by the active component layer on the carrier is 10 microns / cm, the thickness of the active component coating at the thickest end is 190 microns, and the thickness of the active component coating at the thinnest end is 30 microns .

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Abstract

The catalyst in regular structure includes carrier in regular structure and active component coating distributed in the inner surface and / or outer surface of the carrier, with the thickness of the active component coating being in gradient distribution along pore canal axis of the carrier. Using the catalyst in regular structure can reduce the olefin content in FCC gasoline effectively from 43.6 wt% to 17.2 wt%, and convert 50.2 % of the converted olefin into propylene and ethylene. When the catalyst is used as the automobile tail gas catalyst, it can lower the ignition temperature of the tail gas by 30deg.c and raise the tail gas purifying rate up to 95 %.

Description

technical field [0001] The invention relates to a catalyst with a regular structure and a preparation method thereof. Background technique [0002] The traditional reactors currently used in petrochemical and refining fields include fixed-bed reactors filled with catalysts, fluidized-bed reactors, and empty tube reactors without catalysts. They are the most commonly used reactors in industry at present. The fixed bed reactor has a large catalyst bed stack ratio, small space for reactants or products to pass through and large resistance, large reaction pressure drop, low space velocity, and is not suitable for chemical reactions with high or variable space velocity. Slow mass heat transfer can easily lead to uneven temperature distribution of the catalyst bed and further side reactions of the product, which is not conducive to improving the selectivity of the reaction. Empty tube reactors are also widely used in petrochemical and refining. Compared with fixed bed reactors, t...

Claims

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Application Information

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IPC IPC(8): B01J35/10B01J29/04B01J23/38B01J37/02C10G11/02
Inventor 贺振富田辉平龙军达志坚邵潜李阳石德先王宏伟
Owner CHINA PETROLEUM & CHEM CORP
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