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Preparation method for flaky hierarchical-pore-structure hydrotalcite-like material and catalyst, and application of catalyst in propane dehydrogenation

A hydrotalcite, hierarchical pore technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the sintering deactivation and catalytic effect of Pt-based metal centers Can not fully exert, reduce selectivity and bed clogging and other problems, achieve the effect of thin lamella, stable structure, high activity and stability

Pending Publication Date: 2019-12-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the study of propane dehydrogenation supported by HT calcined products, Pt-based catalysts derived from HT showed good dehydrogenation activity and propylene selectivity due to its many advantages, but the calcined particles were easy to crush during the reaction. It leads to the sintering deactivation of the Pt-based metal center, and at the same time, the active center and the pores are easily covered by carbon deposits, which reduces the selectivity and bed blockage, so that the catalytic effect cannot be fully exerted
[0005] Hierarchical porous structure HT materials have the characteristics of high specific surface area, stable structure, and thinner lamellae, and are currently the hotspots of HT research. Medium energy exists stably, and there is no thinner HT material that can be applied to high temperature reactions

Method used

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  • Preparation method for flaky hierarchical-pore-structure hydrotalcite-like material and catalyst, and application of catalyst in propane dehydrogenation
  • Preparation method for flaky hierarchical-pore-structure hydrotalcite-like material and catalyst, and application of catalyst in propane dehydrogenation
  • Preparation method for flaky hierarchical-pore-structure hydrotalcite-like material and catalyst, and application of catalyst in propane dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A catalyst (Pt-In-Mg 2 Al-LDO) method, comprises the following steps:

[0064] Step 1, prepare sheet-shaped hydrotalcite-like material (Mg 2 Al-LDH):

[0065] Magnesium nitrate hexahydrate (0.82g), aluminum nitrate nonahydrate (0.6g), and urea (6g) were added to 65ml of deionized water and magnetically stirred for 30min to fully dissolve to make a mixed solution, and the mixed solution was transferred to 100ml polytetrafluoroethylene The hydrothermal reaction is carried out in a vinyl fluoride high-pressure reactor. The reaction temperature of the high-pressure hydrothermal reaction is 100°C, and the reaction time is 20 hours. The obtained precipitate is washed and filtered with deionized water, and then placed in a blast drying oven at 120°C Dry overnight to obtain sheet-shaped hydrotalcite-like materials (Mg 2 Al-LDH);

[0066] Step 2, loading active metals, using an impregnation method to load active metals on the sheet-shaped hydrotalcite-like material obtained ...

Embodiment 2

[0075] A catalyst (Pt-In-Mg 2 Al-LDO) method, comprises the following steps:

[0076] Step 1, prepare sheet-shaped hydrotalcite-like material (Mg 2 Al-LDH):

[0077] Magnesium nitrate hexahydrate (0.82g), aluminum nitrate nonahydrate (0.6g), and urea (6g) were added to 65ml of deionized water and magnetically stirred for 30min to fully dissolve to make a mixed solution, and the mixed solution was transferred to 100ml polytetrafluoroethylene The hydrothermal reaction is carried out in a vinyl fluoride high-pressure reactor. The reaction temperature of the hydrothermal reaction is 100°C, and the reaction time is 20 hours. The obtained precipitate is washed and filtered with deionized water, and then placed in a blast drying oven at 120°C overnight. Dried to obtain sheet-shaped hydrotalcite-like materials (Mg 2 Al-LDH);

[0078] Step 2, loading active metals, using an impregnation method to load active metals on the sheet-shaped hydrotalcite-like material obtained after step ...

Embodiment 3

[0081] A catalyst (Pt-In-Zn 3 Fe-LDO) method, comprises the following steps:

[0082] Step 1, prepare sheet-shaped hydrotalcite-like material (Zn 3 Fe-LDH):

[0083] Zinc nitrate hexahydrate (7.251g), ferric nitrate nonahydrate (3.283g), and urea (6g) were added to 65ml of deionized water and magnetically stirred for 30min to fully dissolve to make a mixed solution, and the mixed solution was transferred to 100ml polytetrafluoroethylene The hydrothermal reaction is carried out in a vinyl fluoride high-pressure reactor. The reaction temperature of the hydrothermal reaction is 100°C, and the reaction time is 24 hours. The obtained precipitate is washed and filtered with deionized water, and then placed in a blast drying oven at 120°C overnight. Drying, to obtain plate-shaped hydrotalcite-like materials (Zn 3 Fe-LDH);

[0084] Step 2, loading active metals, using an impregnation method to load active metals on the sheet-shaped hydrotalcite-like material obtained after step 1 ...

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Abstract

The invention discloses a preparation method for a flaky hierarchical-pore-structure hydrotalcite-like material and catalyst. The preparation method comprises the following steps: mixing a salt solution containing divalent and trivalent metal ions with a precipitant, carrying out a hydrothermal reaction, and successively carrying out filtering, washing, drying and roasting to obtain the flaky hydrotalcite-like material; and subjecting the flaky hydrotalcite-like material to dipping, drying and roasting a plurality of times to obtain the flaky hierarchical-pore-structure hydrotalcite-like material or catalyst. The flaky hierarchical-pore-structure hydrotalcite-like material prepared by using the method has the characteristics of large specific surface area, stable structure and thin lamellas. When the flaky hierarchical-pore-structure hydrotalcite-like material catalyst is applied to propane dehydrogenation, the catalyst has high activity and long service life due to its complex internal pore channels, high stability and lamellar thickness of about 12 nm. The flaky hierarchical-pore-structure hydrotalcite-like material disclosed by the invention is simple in preparation process andhas good application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a hydrotalcite-like material with sheet-shaped multi-level porous structure, a preparation method of a catalyst and an application of the catalyst in propane dehydrogenation. Background technique [0002] Propane dehydrogenation to propylene catalysts can be mainly divided into two categories: Pt-based catalysts and Cr-based catalysts. Cr-based catalysts will be deactivated rapidly due to carbon deposition, poor stability and toxicity, and cause harm to the environment; Pt-based catalysts have excellent catalytic performance, are green and environmentally friendly, and have development potential, but the active component Pt is easy to sinter and high temperature. The problem of deactivation due to coking and carbon deposition. [0003] Hydrotalcite-like compounds (HT) is a compound assembled by the interaction between the positive charge of the main layer...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J23/89B01J21/10B01J35/10C07C11/06C07C5/333
CPCB01J23/007B01J23/62B01J23/8906B01J23/04C07C5/3337C07C5/3335B01J35/60B01J35/61C07C11/06Y02P20/52
Inventor 张立红宋珍张明李佳鑫鲁逸人
Owner TIANJIN UNIV