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Yolk-eggshell SiO2-Al2O3 noble metal propane dehydrogenation catalyst and preparation method thereof

A technology of noble metal propane and dehydrogenation catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of short operation period and achieve enhanced physical strength , extend the operating cycle, and realize the effect of industrialized continuous production

Active Publication Date: 2020-07-24
ZHEJIANG SATELLITE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of egg yolk-eggshell type SiO 2 -Al 2 o 3 Noble metal propane dehydrogenation catalyst and preparation method thereof, the obtained catalyst has a large specific surface area, high catalytic activity and selectivity, and reduces the carbon deposition rate and improves the single-pass yield; the catalyst has high strength and avoids the catalyst due to the formation of core coke Catalyst rupture caused by the catalyst effectively solves the problems of reactor internal and external network blockage due to catalyst rupture and short operating period of the device.

Method used

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  • Yolk-eggshell SiO2-Al2O3 noble metal propane dehydrogenation catalyst and preparation method thereof
  • Yolk-eggshell SiO2-Al2O3 noble metal propane dehydrogenation catalyst and preparation method thereof
  • Yolk-eggshell SiO2-Al2O3 noble metal propane dehydrogenation catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0046] 1) Preparation of SiO 2 -Al 2 o 3 nanosphere

[0047] Mix acidic aluminum sulfate and basic potassium aluminate at a molar ratio of 7:3, then add desalted water to prepare a solution, heat to 55°C, and add ethyl orthosilicate three times while stirring, of which The molar ratio of ethyl ester to acidic aluminum sulfate is 1:3; then add sodium hydroxide to adjust the pH of the solution to 11, after the reaction is complete, filter with suction, and wash the obtained filter cake with desalinated water to wash excess sodium ions and potassium ions and sulfate until the washed solution shows a pH of 7. Add acetic acid to the filter cake, stir and add ammonia water ethanol solution to make the final slurry neutral, and filter to obtain SiO 2 -Al 2 o 3 filter cake, then dried to obtain SiO 2 -Al 2 o 3 nanomaterials, followed by SiO 2 -Al 2 o 3 A small amount of desalted water is added to the nanomaterials for gelatinization to make SiO 2 -Al 2 o 3 microspheres ...

Embodiment 2

[0060] 1) Preparation of SiO 2 -Al 2 o 3 Microspheres

[0061] Mix acidic aluminum sulfate and basic potassium aluminate according to the molar ratio of 7:3, then add desalted water to prepare a solution, heat to 60°C, and add ethyl orthosilicate three times under the condition of stirring, among which orthosilicate The molar ratio of ethyl ester to acidic aluminum sulfate is 1:2; then add sodium hydroxide to adjust the pH of the solution to 10, after the reaction is complete, filter with suction, and wash the obtained filter cake with desalted water to wash excess sodium ions and potassium ions and sulfate until the washed solution shows a pH of 7. Add acetic acid to the filter cake, stir and add ammonia water ethanol solution to make the final slurry neutral, and filter to obtain SiO 2 -Al 2 o 3 filter cake, then dried to obtain SiO 2 -Al 2 o 3 nanomaterials, followed by SiO 2 -Al 2 o 3 Add a small amount of desalted water to the nanomaterials for gelatinization,...

Embodiment 3

[0073] 1) Preparation of SiO 2 -Al 2 o 3 Microspheres

[0074] Mix acidic aluminum sulfate and basic potassium aluminate according to the molar ratio of 7:3, then add desalted water to prepare a solution, heat to 58°C, and add in three times while stirring, in which ethyl orthosilicate and acidic sulfuric acid The aluminum molar ratio is 1:2.6; Then add sodium hydroxide, adjust the pH of the solution to 10, after the reaction is complete, suction filter, the gained filter cake is washed with desalinated water, and excess sodium ions, potassium ions and sulfate radicals are washed until The eluted solution showed a pH of 7. Add acetic acid to the filter cake, and then add ammonia water and ethanol mixture under stirring conditions to make the final slurry neutral, and filter to obtain SiO 2 -Al 2 o 3 filter cake, then dried to obtain SiO 2 -Al 2 o 3 nanomaterials, followed by SiO 2 -Al 2 o 3 Add a small amount of desalted water to the nanomaterials for gelatinizatio...

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Abstract

The invention discloses a yolk-eggshell SiO2-Al2O3 noble metal propane dehydrogenation catalyst and a preparation method thereof. According to the catalyst, solid SiO2-Al2O3 microspheres are used as egg yolk; porous SiO2-Al2O3 hollow spheres are used as eggshells, yolk and eggshell layers are loaded with effective catalytic active components with different functions respectively, the obtained catalyst has a large specific surface area, the activity and selectivity of the catalyst are improved, the carbon deposition rate is reduced, and the one-way yield is increased; meanwhile, the catalyst has high strength, catalyst breakage caused by core coke generation of the catalyst is avoided, and the problems of blockage of inner and outer nets of a reactor, short operation period of the device and the like caused by catalyst breakage are effectively solved.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to an egg yolk-eggshell type SiO 2 -Al 2 o 3 Noble metal propane dehydrogenation catalyst and preparation method thereof. Background technique [0002] Propylene is an important national strategic substance. With the increasing householdization of non-toxic polypropylene PP, the propylene market has been showing rapid growth in the past five years, maintaining a growth rate of 8.7%, and the domestic gap has reached about 1,200 tons. As the high-consumption steam cracking propylene process is gradually eliminated by the market and the government, the green and environmentally friendly propane dehydrogenation technology has been recognized and pursued by the market. The domestic propane investment boom will continue in the future. At present, there are mainly precious metal platinum catalysts from UOP and chromium-based catalysts from Lummus in China. Because the precious metal...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/10C07C5/333C07C11/06
CPCB01J23/8966C07C5/3337B01J35/397B01J35/398B01J35/61C07C11/06Y02P20/52
Inventor 田俊凯高军杨卫东范昌海周轶单寅昊陆朝阳亓虎寇亮
Owner ZHEJIANG SATELLITE ENERGY CO LTD
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