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N-alkane isomerization catalyst and preparation method thereof

A technology of n-alkane and catalyst, which is applied in the field of n-alkane isomerization catalyst and its preparation, can solve the problems of selectivity and catalytic activity that cannot meet the requirements of n-alkane isomerization, and achieve high catalytic activity and multi-branched The effect of isomerization selectivity

Active Publication Date: 2017-01-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the relatively acidic phosphotungstic acid is dispersed in the channels of mesoporous molecular sieves by impregnation to increase the active sites and exert its acidic effect. The need for isomerization of n-paraffins

Method used

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  • N-alkane isomerization catalyst and preparation method thereof
  • N-alkane isomerization catalyst and preparation method thereof

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preparation example Construction

[0014] The present invention provides a kind of preparation method of n-alkane isomerization catalyst, this method comprises: (1) active metal component platinum is supported on the alumina carrier, obtains the first intermediate after drying; (2) step (1) performing a reduction treatment on the obtained first intermediate to obtain a second intermediate; (3) loading the heteropolyacid on the second intermediate obtained in step (2) and drying to obtain a catalyst.

[0015] In the method of the present invention, the impregnation method can be used to support the metal platinum component on the alumina. The impregnation method can be a saturated impregnation method or a supersaturated impregnation method. The saturated impregnation method is preferred in the present invention. For example, with respect to 100 parts by weight of an alumina carrier, 70-150 mL of platinum containing 0.14-20 mg / mL can be used. The aqueous solution of the platinum compound impregnates the alumina s...

Embodiment 1

[0030] 10g γ-Al 2 o 3Put it into a rotary evaporator, add 15 mL of chloroplatinic acid solution with a platinum content of 6.67 mg / mL, soak at 60° C. for 4 hours, and then evaporate to dryness to obtain the first intermediate.

[0031] The above-mentioned first intermediate is loaded into the reactor, and the reduction treatment is carried out to obtain the second intermediate, wherein the conditions of the reduction treatment include: the hydrogen volume space velocity is 1200 hours -1 , the reduction temperature is 480°C, and the reduction time is 4 hours.

[0032] Then use 15mL of 0.33g / mL aqueous solution of phosphotungstic acid to impregnate the above-mentioned second intermediate at 60°C for 2 hours, and then rotate to dryness to obtain the catalyst, whose composition is shown in Table 1.

Embodiment 2

[0034] 10gη-Al 2 o 3 Put it into a rotary evaporator, add 8 mL of chloroplatinic acid solution with a platinum content of 5.63 mg / mL, soak at 60° C. for 4 hours, and dry by rotary evaporation to obtain the first intermediate.

[0035] The above-mentioned first intermediate is loaded into the reactor, and the reduction treatment is carried out to obtain the second intermediate, wherein the conditions of the reduction treatment include: the hydrogen volume space velocity is 30 hours -1 , the reduction temperature was 200° C., and the reduction time was 8 hours to obtain the second intermediate.

[0036] Then, 8 mL of 0.38 g / mL silicotungstic acid aqueous solution was used to impregnate the above-mentioned second intermediate at 60°C for 2 hours, and then evaporated to dryness to obtain the catalyst, whose composition is shown in Table 1.

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Abstract

The invention discloses an n-alkane isomerization catalyst preparation method. The method comprises the following steps: 1) loading an active metal component platinum on an alumina carrier and drying the carrier to obtain a first intermediate; 2) performing reduction processing on the first intermediate to obtain a second intermediate; and 3) loading heteropoly acid on the second intermediate, and drying the material to obtain a catalyst. The invention also provides a n-alkane isomerization catalyst prepared by the method. Compared with the prior art, the n-alkane isomerization catalyst of the invention has better catalytic activity and isomerization products selectivity.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a n-paraffin isomerization catalyst and a preparation method thereof. Background technique [0002] High-octane branched-chain alkanes have always been ideal gasoline components, while there are a large number of straight-chain alkanes in crude oil. Therefore, it is particularly important to convert low-octane linear paraffins into high-octane linear paraffins by isomerization technology. Since normal alkanes are prone to cracking reactions during isomerization, the yield of multi-branched alkanes especially with high octane number is reduced and the liquid yield is affected. Effectively controlling the formation of cracked products in the isomerization process and improving the selectivity of multi-branched isoparaffins has become the focus of catalyst development. [0003] CN100425583C discloses a method for preparing an alkane isomerization catalyst. The catalyst prepared by the met...

Claims

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Application Information

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IPC IPC(8): B01J31/26C07C5/27C07C9/16
Inventor 李金芝龙军于中伟孔令江马爱增周涵
Owner CHINA PETROLEUM & CHEM CORP
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