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A kind of supported platinum-based catalyst and preparation method thereof

A catalyst and supported technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as lack of catalytic activity and limited catalytic efficiency of catalysts

Active Publication Date: 2019-03-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since these common hydrotalcites themselves do not have catalytic activity, they are only used as supports, which limits the catalytic efficiency of the catalyst to a large extent.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0029] The preparation of the above catalyst is based on SnO 2 -Al 2 o 3 Based on the weight of the carrier, the Sn component in the composite oxide has a mass percentage of 0.1wt%-2wt%, the Al component has a mass percentage of 52wt%-52.9wt%, and the rest is an oxygen component. Based on the total mass of the catalyst, the mass percentage of the platinum component is 0.05wt% to 2wt%; the composite oxide SnO 2 -Al 2 o 3 The mass percentage content is 23wt%~95.95wt%; the mass percentage content of inorganic oxide binder is 2wt%~50wt%; the mass percentage content of extrusion aid is 1wt%~15wt%; the mass percentage content of acid peptizer It is 1wt%-10wt%.

[0030] The preparation method of supported platinum-based catalyst of the present invention is:

[0031] Step a) Dissolving the template agent in an aqueous ethanol solution with a volume ratio of absolute ethanol and deionized water of 3:1 to 1:3 at room temperature, the mass ratio of the template agent to the aqueous...

Embodiment 1

[0037] Dissolve 6g of cetyltrimethylammonium bromide in a mixed solution of 225mL of absolute ethanol and 525mL of deionized water, add 23.84g of aluminum isopropoxide after dissolution, and continue to stir the mixed solution at 60°C for 3h. Then the above liquid is filtered, washed, dried and calcined to obtain mesoporous alumina.

[0038] 14.3mmol SnCl 2 2H 2 O and 0.1mmol urea were dissolved in 600mL of distilled water, stirred evenly, and transferred to a 1000mL polytetrafluoroethylene-lined autoclave; After hydrothermal treatment at ℃ for 10 h, filter, wash with distilled water and absolute ethanol for 5 times, and finally, dry at 80 °C for 10 h to obtain Sn-Al LDHs / Al with specific morphology 2 o 3 composite material.

[0039] Take 3g of the above Sn-Al LDHs / Al 2 o 3 The composite material was dissolved in a solution composed of 20mL ethanol and 50mL deionized water, stirred at room temperature for 1h, then added 1.08mL chloroplatinic acid (platinum concentration:...

Embodiment 2

[0044] Dissolve 3g of cetyltrimethylammonium bromide and 3g of polyvinylpyrrolidone in a mixed solution of 225mL of absolute ethanol and 525mL of deionized water, add 23.84g of aluminum sec-butoxide after dissolution, and continue stirring the mixed solution at 60°C 3h. Then the above liquid is filtered, washed, dried and calcined to obtain mesoporous alumina.

[0045] 14.3mmol SnCl 2 2H 2 O and 1.12mL ammonia water (mass fraction is 28wt%) were dissolved in 600mL distilled water, after stirring evenly, transferred to a 1000mL polytetrafluoroethylene-lined autoclave; then, take 3g of the above prepared mesoporous Al 2 o 3 Immersed in the above solution, after hydrothermal treatment at 120 °C for 10 h, the liquid was filtered, washed with distilled water and absolute ethanol for 5 times, and finally dried at 80 °C for 10 h to obtain Sn-Al LDHs / Al with specific morphology 2 o 3 composite material.

[0046] Take 3g of the above Sn-Al LDHs / Al 2 o 3 The composite material w...

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Abstract

The invention provides a supported platinum-based catalyst and a preparation method thereof. Mesoporous alumina with certain pore structure parameters is first prepared, and SnCl is 2 ·2H 2 O reacts with the prepared mesoporous alumina in an alkaline solution to prepare Sn‑Al LDHs / Al with a certain morphology 2 O 3 composite material; then, the prepared Sn-AlLDHs / Al 2 O 3 Dip into platinum-containing acid solution to achieve in-situ reduction of platinum metal between the layers of Sn-Al LDHs. After extrusion molding, drying and activation treatment are performed to make Sn-Al LDHs / Al 2 O 3 The composite material transforms into SnO with specific morphology 2 ‑Al 2 O 3 Composite oxide; finally, through hydrogen reduction treatment, Pt / SnO is prepared 2 ‑Al 2 O 3 Catalyst for the catalytic reaction of propane dehydrogenation to propylene. The reaction performance evaluation results of the catalyst show that the catalyst prepared by this method has high thermal stability and catalytic activity, has a long service life, and shows good application prospects.

Description

technical field [0001] The invention relates to a supported platinum-based catalyst and a preparation method thereof, belonging to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] Propane dehydrogenation to propylene technology is an important way to optimize the utilization of low-carbon alkane resources in refinery gas and oilfield associated gas, and has important research significance. Since propane dehydrogenation is a strong endothermic reaction process, which needs to be carried out under harsh conditions of high temperature, sintering and carbon deposition of active components will lead to rapid deactivation of the catalyst. The development of dehydrogenation catalysts with excellent reactivity is the key to the realization of this technology. [0003] The catalyst used in the propane catalytic dehydrogenation reaction is a heterogeneous catalyst, and the active metal Pt particles are the main catalyti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/62C07C5/333C07C11/06
CPCC07C5/3337B01J23/002B01J23/62C07C2523/62B01J35/396C07C11/06Y02P20/52
Inventor 张一卫张红星周钰明盛晓莉方嘉声赵硕张超
Owner SOUTHEAST UNIV
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