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A kind of preparation method of low carbon alkane dehydrogenation catalyst

A technology for dehydrogenation catalysts and low-carbon alkanes, which is applied in the direction of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., and can solve problems such as interactions and positions that have not been clarified, so as to prolong the single-pass operation cycle and reduce operating costs , highly active effect

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the interaction and position between Pt, Sn and the support are mostly not elucidated

Method used

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  • A kind of preparation method of low carbon alkane dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of Pt-Sn impregnation solution: Dissolve 0.68g of chloroplatinic acid in 100ml of deionized water, then add 0.74g of crystalline tin tetrachloride to the solution, and stir to dissolve it. Add 3g of EDTA to the solution and stir thoroughly to obtain a Pt-Sn impregnation solution.

[0021] Weigh 50g spherical γ-Al 2 o 3 The carrier was placed in a rotary evaporator and vacuumed for 60 min. The impregnating solution was sucked into the rotary evaporator, the vacuum pump was turned off, and the impregnation was carried out at room temperature and pressure for 6 hours.

[0022] Then, the temperature of the water bath was raised to 80° C., the catalyst was vacuum-dried, then transferred into a beaker, and dried in an oven at 110° C. for 15 hours. The catalyst was then transferred to a muffle furnace and calcined at 500°C for 5 hours. The above catalyst is impregnated with an aqueous solution of potassium nitrate, dried and calcined to obtain the final catalys...

Embodiment 2

[0042] Preparation of Pt-Sn impregnation solution: Dissolve 0.41g of chloroplatinic acid in 100ml of deionized water, then add 1.5g of crystalline tin tetrachloride to the solution, and stir to dissolve it. Then add 4g of EDTA to the solution and stir thoroughly to obtain a Pt-Sn impregnating solution.

[0043] Weigh 50g spherical θ-Al 2 o 3 The carrier was placed in a rotary evaporator and vacuumed for 50 min. The impregnating solution was sucked into the rotary evaporator, the vacuum pump was turned off, and the impregnation was carried out at room temperature and pressure for 5 hours.

[0044] Then the temperature of the water bath was raised to 70° C., the catalyst was vacuum-dried and then transferred into a beaker, and dried in an oven at 120° C. for 11 hours. The catalyst was then transferred to a muffle furnace and calcined at 510°C for 4 hours. The above catalyst is impregnated with an aqueous solution of zinc nitrate, dried and calcined to obtain the final cataly...

Embodiment 3

[0047] Preparation of Pt-Sn impregnation solution: Dissolve 0.82g of chloroplatinic acid in 100ml of deionized water, then add 0.44g of crystalline tin tetrachloride to the solution, and stir to dissolve it. Add 3g of EDTA to the solution and stir thoroughly to obtain a Pt-Sn impregnation solution.

[0048] Weigh 50g spherical γ-Al 2 o 3 The carrier was placed in a rotary evaporator and vacuumed for 60 min. The impregnating solution was sucked into the rotary evaporator, the vacuum pump was turned off, and the impregnation was carried out at room temperature and pressure for 7 hours.

[0049] Then, the temperature of the water bath was raised to 85° C., the catalyst was vacuum-dried, then transferred into a beaker, and dried in an oven at 110° C. for 10 hours. Then the catalyst was moved to a muffle furnace and calcined at 520°C for 3 hours. The above-mentioned catalyst is then impregnated with an aqueous solution of gallium nitrate, dried and calcined to obtain the final ...

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Abstract

The invention discloses a preparation method of a low-carbon alkane dehydrogenation catalyst, which includes the following contents: (1) Preparation of Pt-Sn impregnation solution: take an appropriate amount of platinum soluble salt, dissolve it in deionized water, and then add tin to the solution The soluble salt of the Pt-Sn is stirred evenly, and an appropriate amount of ethylenediaminetetraacetic acid is added to the solution, and stirred evenly to obtain a Pt-Sn impregnating solution; (2) impregnating the carrier with the impregnating solution obtained in step (1), drying, roasting, and then The second promoter metal is loaded onto the support to obtain the final catalyst. The invention loads Pt and Sn on the surface of the carrier through the complex co-impregnation method, so that the catalyst can still maintain high activity under high carbon deposition, prolongs the single-pass operation period of the catalyst, and reduces the device operation cost.

Description

technical field [0001] The invention relates to a preparation method of a low-carbon alkane dehydrogenation catalyst. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to diversifying the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/06
CPCB01J23/626C07C5/3337C07C11/06Y02P20/52
Inventor 王振宇郑步梅张淑梅
Owner CHINA PETROLEUM & CHEM CORP
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