Regeneration method of noble metal catalyst

A technology for catalysts and dehydrogenation catalysts, which is applied in the regeneration field of propane and isobutane dehydrogenation noble metal-based catalysts. It can solve problems such as metal aggregation, alkali metal loss, and alumina carrier crystal phase transition, and achieves small temperature changes and easy Operation and the effect of prolonging the service life

Inactive Publication Date: 2015-11-11
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When these two methods are used for catalyst regeneration, water vapor is introduced, which will not only cause the crystal phase transformation of the alumina carrier, but also cause the loss of alkali metal in the low-carbon alkane catalyst, and also cause metal aggregation to a certain extent.
[0008] It can be seen from the above regeneration methods of noble metal-based dehydrogenation catalysts that oxygen, halogen or water vapor are usually purposefully introduced during the regeneration process, although the problems of carbon deposition, metal accumulation and alkali metal loss are solved to a certain extent , but it often brings other side effects, and the above three problems cannot be taken into account at the same time, which inevitably results in the performance and life of the low-carbon alkane dehydrogenation regeneration catalyst

Method used

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  • Regeneration method of noble metal catalyst

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Experimental program
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Effect test

Embodiment 1

[0029] Weigh commercially available alumina carrier (γ phase, spherical, diameter 0.5mm, pore volume 0.71cm 3 / g, specific surface area 224m 2 / g) 30g, add deionized water dropwise to initial moistening, and the volume of consumed water is 27mL. Based on the weight content of 0.4% of the Sn element in the final catalyst, stannous chloride containing 0.12 g of Sn was weighed and dissolved in ethanol, and the volume was adjusted to 27 mL with ethanol. The prepared Sn-containing ethanol solution was added to 30 g of alumina carrier, mixed evenly, and aged at room temperature for 2 hours. Dry at 80°C for 8h, then bake at 600°C for 4h.

[0030] Based on the weight content of 0.5% of the Pt element in the final catalyst, weigh 0.18g of Pt-containing chloroplatinic acid and dissolve it in deionized water, set the volume to 27mL, add it to the Sn-containing alumina carrier, mix well, and age at room temperature for 4h. Dry at 100°C for 6h, and bake at 600°C for 4h. The sample obta...

Embodiment 2

[0033] Weigh commercially available alumina carrier (γ phase, spherical, diameter 0.5mm, pore volume 0.71cm 3 / g, specific surface area 224m 2 / g) 30g, add deionized water dropwise to initial moistening, and the volume of consumed water is 27mL. Based on the weight content of 0.6% of the Sn element in the final catalyst, stannous chloride containing 0.18g of Sn was weighed and dissolved in ethanol, and the volume was adjusted to 27mL. The prepared Sn-containing ethanol solution was added to 30 g of alumina carrier, mixed evenly, and aged at room temperature for 4 hours. Dry at 100°C for 6h, then bake at 500°C for 6h.

[0034] Based on the weight content of 0.7% of the Pt element in the final catalyst, weigh 0.12 g of Pt-containing chloroplatinic acid and dissolve it in deionized water, set the volume to 27 mL, add it to the Sn-containing alumina carrier, mix well, and age at room temperature for 2 h. Dry at 120°C for 4h, and bake at 500°C for 6h. The sample obtained in the...

Embodiment 3

[0037] After the C-1 fresh agent reacted for 72 hours, switch the raw material gas to pure hydrogen gas, purging for 1 hour, then the temperature dropped to 450°C, the pressure rose to 8MPa, and then hydrogen and tetralin were introduced at the same time. The speed is 1.5h -1 , the volume ratio of hydrogen to tetralin is 350, and the treatment time is 3h. After the treatment, switch to nitrogen, drop to normal pressure and room temperature, pass through cyclohexane to clean the deactivated catalyst, and then purging at 100°C for 3h in a nitrogen atmosphere. Under a nitrogen atmosphere, raise the temperature of the deactivated catalyst to 550°C, raise the pressure to 0.5MPa, and then feed a mixed gas of carbon dioxide and nitrous oxide. The volume content of nitrous oxide in the mixed gas is 0.5%, and the volume space velocity is 2000h -1 , the processing time is 3h. Obtain C-1 primary regeneration agent.

[0038] The reaction performance of C-1 primary regeneration agent is...

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Abstract

A regeneration method of a noble metal catalyst. The invention discloses a regeneration method of a low-carbon alkane dehydrogenation catalyst, by which a deactivated noble metal-based low-carbon alkane dehydrogenation catalyst recovers an excellent catalytic performance. The method includes the following steps: (1) under hydrogen atmosphere, treating the deactivated catalyst in a hydrogen donor solvent; and (2) treating the treated deactivated catalyst in the step (1) in a mixed atmosphere containing CO2 and N2O to obtain regenerated catalyst. The regeneration method of the low-carbon alkane dehydrogenation catalyst can allow the dehydrogenation activity of the regenerated catalyst to reach the level of a fresh catalyst. The regeneration method is simple in processes and is easy to carry out.

Description

technical field [0001] The invention relates to a regeneration method of a low-carbon alkane dehydrogenation catalyst, in particular to a regeneration method of a noble metal-based catalyst for propane and isobutane dehydrogenation. Background technique [0002] The shale revolution in North America has brought a large amount of low-carbon alkanes resources, resulting in the lightening of raw materials for ethylene crackers and a sharp drop in propylene production. At the same time, under the background of increasingly scarce petroleum resources, the production of propylene has changed from purely relying on petroleum as a raw material to diversifying the technical route of raw material sources, and it has gradually become a trend. Dehydrogenation of propane by-produced in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce propylene is an effective way to solve this problem. In recent years, the technology of propane dehydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J38/58B01J38/04B01J23/42
Inventor 张海娟王海彦丛玉凤张连红王卫强
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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