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Load type platinum-based catalyst and preparation method thereof

A catalyst and supported technology, applied in the direction of catalysts, carbon compound catalysts, chemical instruments and methods, etc., can solve the problems of limiting the catalytic efficiency of catalysts, lack of catalytic activity, etc.

Active Publication Date: 2017-05-10
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
Comparison scheme
Effect test

preparation example Construction

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

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

[0031] Step a) At room temperature, the template is dissolved in an ethanol aqueous solution with a volume ratio of absolute ethanol and deionized water of 3:1 to 1:3, and the mass ratio of the template to the ethanol aqueous solution is 1:25 to 1:250. Then add aluminum sourc...

Embodiment 1

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

[0038] Add 14.3mmol SnCl 2 ·2H 2 O and 0.1mmol of urea were dissolved in 600mL of distilled water, stirred evenly, and transferred to a 1000mL polytetrafluoroethylene lined autoclave; then, 3g of the mesoporous alumina prepared above was impregnated into the above solution, After hydrothermal treatment at ℃ for 10 hours, filter, wash with distilled water and absolute ethanol for 5 times, and finally, dry at 80 ℃ for 10 hours to obtain Sn-Al LDHs / Al with specific morphology 2 O 3 Composite materials.

[0039] Take 3g of the above Sn-Al LDHs / Al 2 O 3 The composite material was dissolved in a solution consisting of 20 mL ethanol and ...

Embodiment 2

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

[0045] Add 14.3mmol SnCl 2 ·2H 2 O and 1.12mL ammonia water (mass fraction 28wt%) dissolved in 600mL distilled water, after stirring evenly, transferred to a 1000mL polytetrafluoroethylene lined autoclave; then, take 3g of the mesoporous Al prepared above 2 O 3 Dip into the above solution, after hydrothermal treatment at 120℃ for 10h, filter the liquid, wash with distilled water and absolute ethanol for 5 times, and finally, dry at 80℃ for 10h to obtain Sn-Al LDHs / Al with specific morphology 2 O 3 Composite materials.

[0046] Take 3g of the above Sn-Al LDHs / Al 2 O 3 The composite material was dissolved in a solution consisti...

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Abstract

The invention provides a load type platinum-based catalyst and a preparation method thereof. The preparation method comprises the steps of firstly preparing mesoporous aluminum oxide with certain porous structure parameters, and reacting SnCl2.2H2O with the prepared mesoporous aluminum oxide in aqueous alkali to prepare an Sn-Al LDHs / Al2O3 composite with certain morphology; then dipping the prepared Sn-Al LDHs / Al2O3 into solution containing platinic acid to achieve in-situ reduction of platinum metal between laminates of Sn-Al LDHs, extruding and moulding into strips, and then performing drying and activating treatment, thus converting the Sn-Al LDHs / Al2O3 composite into an SnO2-Al2O3 composite oxide with certain morphology; finally preparing the Pt / Sno2-Al2O3 catalyst through hydrogen reduction treatment, wherein the Pt / Sno2-Al2O3 catalyst can be applied to catalytic reaction of preparing propylene through propane dehydrogenation. The reaction performance evaluation results of the catalyst show that the catalyst prepared through the preparation method has high thermal stability and catalytic activity, is long in service, and shows good application prospect.

Description

Technical field [0001] The invention relates to a supported platinum-based catalyst and a preparation method thereof, and belongs to a 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 alkanes in refinery gas and oilfield associated gas, and has important research significance. Since propane dehydrogenation is a strong endothermic reaction process that needs to be carried out under severe conditions at high temperatures, sintering of active components and carbon deposition will lead to rapid deactivation of the catalyst. The development of dehydrogenation catalysts with excellent reaction performance is the key to this technology. [0003] The catalyst used in the catalytic dehydrogenation of propane is a heterogeneous catalyst, and the active metal Pt particles are the main catalytic active center. The dispersion...

Claims

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Application Information

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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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