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Regeneration method of dehydrogenation catalyst for low-carbon alkane

A technology for dehydrogenation catalysts and low-carbon alkanes, applied in the direction of catalyst regeneration/reactivation, carbon compound catalysts, catalysts, etc., can solve the problems of many operation steps, danger, and irreversible deactivation of catalysts, and achieve small temperature changes and easy operation , Eliminate the effect of carbon deposition

Inactive Publication Date: 2016-08-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the same conditions, oxygen completely removes carbon deposits, but because the used catalyst carrier has a certain carbon capacity, reducing gases such as hydrogen can also restore catalyst activity by partially eliminating carbon deposits; It is easy to cause active metal sintering and cause irreversible deactivation of the catalyst, and the catalyst needs to be re-reduced after charcoal regeneration in an oxidative atmosphere, and the inert gas purge needs to be switched multiple times before and after, and the operation steps are many, and it is also dangerous

Method used

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  • Regeneration method of dehydrogenation catalyst for low-carbon alkane
  • Regeneration method of dehydrogenation catalyst for low-carbon alkane
  • Regeneration method of dehydrogenation catalyst for low-carbon alkane

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1)PtSn / Al 2 o 3 After reacting at 540°C on the catalyst for 8 hours, switch to nitrogen, with a space velocity of 6000ml / g / h, and purging to cool down to 200°C;

[0024] (2) 10% H with a space velocity of 15000ml / g / h is introduced 2 / N 2 Purge for 0.5 hours, raise the temperature at 5°C / min to 450°C and keep it for 0.5 hours, then raise the temperature to 540°C at 5°C / min and keep it for 2 hours;

[0025] (3) After switching nitrogen purging, the reaction raw material gas was re-introduced to carry out the reaction again, and the above steps were repeated for a total of 4 regenerations.

Embodiment 2

[0032] PtGa / Al 2 o 3 The catalyst is regenerated in a reducing atmosphere, the steps are the same as in Example 1, and the results are shown in Table 2. After 4 times of reductive regeneration, PtGa / Al 2 o 3 73% of the activity remained.

Embodiment 3

[0034] PtZn / Al 2 o 3 The catalyst is regenerated in a reducing atmosphere, the steps are the same as in Example 1, and the results are shown in Table 3. After 4 times of reductive regeneration, PtZn / Al 2 o 3 83% of the activity remained.

[0035] Table 1 PtSn / Al 2 o 3 Regeneration comparison between reducing atmosphere and oxidizing atmosphere on catalyst

[0036]

[0037] Table 2 PtGa / Al 2 o 3 Results of Reducing Atmosphere Regeneration on Catalyst

[0038]

[0039] Table 3 PtZn / Al 2 o 3 Results of Reducing Atmosphere Regeneration on Catalyst

[0040]

[0041] As can be seen from the data in the above tables, the low-carbon alkane dehydrogenation catalyst after applying the method of the present invention to regenerate has higher activity than the catalyst regenerated in oxidative atmosphere, and obviously the method of the present invention can more effectively regenerate low Catalysts for the dehydrogenation of alkanes.

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Abstract

The invention discloses a regeneration method of a dehydrogenation catalyst for low-carbon alkane, and belongs to the field of regeneration techniques of catalysts. The regeneration method of the dehydrogenation catalyst for the low-carbon alkane, which is provided by the invention, comprises the following processes: (1), introducing an inert gas into an inactivated dehydrogenation catalyst, and performing sweeping to lower the temperature to be 200 DEG C; (2), switching the inert gas to a gas mixture containing a reducing gas, and changing the temperature and sweeping to remove a carbon deposit by multiple procedures; (3), carrying out sweeping treatment again by using the inert gas. The catalyst treated by the three steps can be used for the dehydrogenation reaction of the low-carbon alkane continuously by switching a reaction gas. The regeneration method of the dehydrogenation catalyst for the low-carbon alkane, which is provided by the invention, avoids the use of an oxygen gas, so as to have high regeneration efficiency, reduce the reoccurring reaction time of the catalyst, and prevent the catalyst from being sintered; and the catalytic activity of the regenerated catalyst reaches the level of a fresh catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, in particular to a regeneration method of a low-carbon alkane dehydrogenation catalyst. Background technique [0002] With the development of the economy, the demand for low-carbon olefins, which are the basic raw materials of petrochemicals, continues to grow. As a result, the low-carbon olefins obtained mainly by steam cracking and refinery fluid catalytic cracking in the past are difficult to meet the market demand. At present, it is a practical solution to convert the by-produced low-carbon alkanes in natural gas (conventional natural gas, shale gas, coal bed methane, combustible ice, etc.) into propylene butene, which is currently in short supply in the market. Therefore, it is necessary to develop efficient and stable low-carbon alkane dehydrogenation catalysts and production processes. [0003] The dehydrogenation of low-carbon alkanes is a strong endothermic reaction, limit...

Claims

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Application Information

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IPC IPC(8): B01J38/10B01J23/96B01J23/62C07C5/333C07C11/06
CPCY02P20/52Y02P20/584B01J38/10B01J23/62B01J23/626B01J23/96C07C5/3337C07C2523/62C07C11/06
Inventor 解晓伟曹铭津孙长勇
Owner GUANGDONG UNIV OF TECH
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