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Pd radicel duplex metal selective hydrogenation catalyzer and method for preparing the same and application thereof

A hydrogenation catalyst and a selective technology, applied in the field of bimetallic butadiene selective hydrogenation catalyst and its preparation, can solve the problems of low catalyst activity and selectivity, low catalytic efficiency and the like

Inactive Publication Date: 2007-12-05
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a catalyst and its preparation method in view of the shortcomings of low catalyst activity and selectivity and low catalytic efficiency in the prior art. High selectivity, good stability, long service life, greatly improved catalytic efficiency

Method used

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  • Pd radicel duplex metal selective hydrogenation catalyzer and method for preparing the same and application thereof
  • Pd radicel duplex metal selective hydrogenation catalyzer and method for preparing the same and application thereof
  • Pd radicel duplex metal selective hydrogenation catalyzer and method for preparing the same and application thereof

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Embodiment 1

[0024] The carrier of the catalyst of the present invention is active zinc oxide, based on the total mass of the catalyst, and based on the mass content, it contains the following components: the active component is palladium metal, the content of which is 0.03%-0.3%; the catalytic component is One of chromium metal, silver metal, nickel metal, cesium metal or lead metal, and its content is 0.4%-1.2%. Figure 1 reflects the effect of palladium metal content on catalyst performance. It can be seen from Figure 1 that as the content of palladium metal increases, the active sites of the catalyst increase, and the activity of the catalyst increases. However, when the content of palladium metal increases to a certain extent, the catalyst appears to be too active, which easily leads to the deep hydrogenation of the target product butene. Decrease; In addition, the content of palladium metal is too high, which increases the cost of the catalyst and also has an adverse effect on the industr...

Embodiment 2

[0040]Figure 3 is a flow chart of the preparation method of the present invention. This embodiment is a preparation method of the above-mentioned catalyst, which includes the following steps:

[0041] Step 1. Take the dried active zinc oxide carrier and put it into a high-temperature furnace for roasting at 400-600°C at a heating rate of 200°C / hour. After reaching the preset temperature, keep it for 3-4 hours, and then naturally decrease to Take it out at room temperature;

[0042] Step 2. Co-impregnate a palladium chloride solution with a palladium metal content of 0.08%-0.1%, a chromium trioxide solution with a chromium metal content of 0.7%-0.9%, and the activated zinc oxide carrier roasted in step 1;

[0043] Step 3. After drying, roasting and pre-reduction.

Embodiment 3

[0045] This embodiment is a method for selective hydrogenation using the above catalyst. The method is carried out in the gas phase, the reaction temperature is 90-170°C, the reaction pressure is 0.3-0.5 MPa, and the amount of hydrogen / butadiene substance The ratio is 1.0:1 to 5.0:1, and the gas space velocity is 500-2000h -1 .

[0046] Since the reaction is carried out under gas phase conditions, as long as the pressure drop before and after the reactor does not change much, and the normal vaporization rate of the liquefied gas is ensured, the pressure change has basically no effect on the reaction, and the reaction result is stable and unchanging. Considering that the pressure of the liquefied gas tank itself is not high, and the liquefied gas is gradually vaporized, it is more appropriate to keep the pressure between 0.3-0.5 MPa during the reaction.

[0047] Figure 4 shows the effect of temperature on the hydrogenation reaction of the catalyst. It can be seen from the evaluatio...

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Abstract

The palladium-base bimetal catalyst for selective hydrogenation includes active zinc oxide as carrier; metal palladium as the active component in 0.03-0.3 wt% of the catalyst; and one of Cr, Ag, Ni, Cs and Pb as cocatalyst in 0.4-1.2 wt%. Its preparation process includes the steps of: roasting dried active zinc oxide carrier, soaking the carrier in palladium chloride solution with palladium content of 0.08-0.1 % and chromium trioxide with chromium content of 0.7-0.9 %, drying, roasting and pre-reducing. The catalyst has high activity, high selectivity, high stability, long service life and high catalytic efficiency.

Description

Technical field [0001] The present invention relates to a selective hydrogenation catalyst and a preparation method thereof, and to a method for selective hydrogenation using these catalysts; in particular, a bimetal butadiene selective hydrogenation catalyst and a preparation method thereof, and selection The method of sexual hydrogenation. Background technique [0002] Petroleum processing equipment will produce a large amount of C during the production process 4 Hydrocarbon, the C 4 Hydrocarbons are mainly composed of isobutene, 1-butene, cis-2-butene, trans-2-butene, n-butane, isobutane, etc. They are very useful chemical raw materials and can be used to manufacture a variety of chemical products. The current domestic C 4 Most of the hydrocarbons are burned as fuel, but not rationally used. With the rapid popularity of city gas and natural gas as civil fuels, more and more C 4 Hydrocarbons will be used as chemical raw materials. It can be seen that C is used rationally. 4 Hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/89B01J23/63C07C5/05C07C11/08
Inventor 张喜文徐海升韦永李谦定
Owner PETROCHINA CO LTD
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