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Catalyst for propylene production using propane dehydrogenation and preparation method and application of catalyst

A propane dehydrogenation and catalyst technology, applied in the field of catalyst and its preparation, supported catalyst and its preparation, can solve problems such as uneven distribution, reduce catalyst acidity, increase anti-coking ability, etc., to improve catalytic efficiency, reduce transmission Mass resistance, good high temperature stability effect

Inactive Publication Date: 2016-07-06
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The carbon deposition of the propane dehydrogenation catalyst is mainly caused by the strong acidity in the catalyst. The use of alkali metal or alkaline earth metal oxides can effectively reduce the acidity strength, but there is a disadvantage of uneven distribution. Therefore, the acidity of the alumina framework can be adjusted. Effectively reduce the acidity of the catalyst and increase the ability to resist carbon deposition

Method used

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  • Catalyst for propylene production using propane dehydrogenation and preparation method and application of catalyst
  • Catalyst for propylene production using propane dehydrogenation and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Composite carrier preparation:

[0034] Weigh 58g of P123 and dissolve in 1000ml of absolute ethanol to prepare solution 1; weigh 3.3g of zirconium nitrate and 81.6g of aluminum isopropoxide and dissolve in 500ml of 70% nitric acid aqueous solution to prepare solution 2; dissolve solution 2 within 30min Added dropwise to solution 1, stirred for 4h until completely mixed. The solution was slowly heated to 60° C., kept at the temperature for 48 hours, and the solvent was evaporated to obtain a white powder, which was calcined at 650° C. for 4 hours to obtain 21.6 g of a composite oxide carrier.

[0035] Catalyst load:

[0036] Dissolve 6.2g of chromium acetate and 0.16g of sodium nitrate in 10ml of water, add 21.6g of the above-mentioned alumina-zirconia composite oxide, stir for 30min, dry at room temperature for 18h, dry at 100°C for 12h, calcinate at 750°C for 6h, and use a tablet press Press into a sheet to obtain a propane dehydrogenation catalyst A. In the cataly...

Embodiment 2

[0038] Composite carrier preparation:

[0039] Weigh 58g of P123 and dissolve in 1000ml of absolute ethanol to prepare solution 1; weigh 4.6g of cerium nitrate and 81.6g of aluminum isopropoxide and dissolve in 500ml of 70% nitric acid aqueous solution to obtain solution 2; dissolve solution 2 within 30min Added dropwise to solution 1, stirred for 4h until completely mixed. Slowly heat the solution to 60°C, keep the temperature and heat for 42h, evaporate the solvent to obtain a white powder, and calcinate at 650°C for 4h to obtain an alumina-ceria composite oxide carrier.

[0040] Catalyst load:

[0041] Dissolve 7.4g of chromium acetate and 0.16g of sodium nitrate in 10ml of water, add 22.4g of the above-mentioned alumina-cerium oxide composite oxide, stir for 30min, dry at room temperature for 24h, dry at 100°C for 12h, and calcinate at 750°C for 6h. Press into a sheet to obtain propane dehydrogenation catalyst B. In the catalyst, the content of cerium oxide is 9.8%, the...

Embodiment 3

[0043] The preparation of the composite carrier is the same as in Example 1.

[0044] Catalyst load:

[0045] Dissolve 6.2g of chromium acetate and 0.16g of sodium nitrate in 8.2ml of water, add 21.6g of the above-mentioned alumina-zirconia composite oxide, stir for 30min, extrude, dry at room temperature for 24h, dry at 100°C for 12h, and calcine at 750°C for 6h , to prepare propane dehydrogenation catalyst C. In the catalyst, the content of zirconium oxide is 5.9%, the loading amount of chromium oxide is 10%, and the loading amount of sodium oxide is 0.3%, all of which are calculated by the weight of aluminum oxide.

[0046] The physical properties of the catalysts obtained in the above examples are shown in Table 1.

[0047] Each embodiment of table 1 obtains the physical property of catalyst

[0048]

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Abstract

The invention provides a catalyst for propylene production using propane dehydrogenation, a preparation method thereof and application of the catalyst to the field of propylene production using propane dehydrogenation.The catalyst is characterized in that the catalyst uses regular mesoporous alumina-zirconia or alumina-cerium oxide composite oxide as the carrier, chromium oxide as the active component and alkali metal oxide as the auxiliary; by the weight of alumina, the content of zirconia or cerium oxide is 2-10%; the loading amount of the chromium oxide is 5-15%, and the loading amount of the alkali metal oxide is 0.05-0.5%.The catalyst is high in propane conversion rate and propylene selectivity, can inhibit carbon deposition and is good in high-temperature stability.

Description

technical field [0001] The present invention relates to a catalyst for the direct dehydrogenation of propane to produce propylene and a preparation method thereof, in particular to a chromium oxide-loaded catalyst with regular mesoporous alumina-zirconia or alumina-cerium oxide composites as the carrier A type catalyst and a preparation method thereof belong to the field of petrochemical industry, in particular to the technical field of catalytic dehydrogenation. Background technique [0002] Propylene is an important chemical raw material, and its demand is increasing year by year. Propylene is mainly derived from steam cracking and catalytic cracking by-products. Its supply is largely restricted by ethylene, gasoline and diesel. It is difficult to meet the requirements through simple steam cracking capacity expansion. Therefore, the use of propane dehydrogenation reaction is the key to the production of propylene. important supplementary route. [0003] Propane dehydroge...

Claims

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Application Information

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IPC IPC(8): B01J23/26C07C5/333C07C11/06
CPCC07C5/3332B01J23/002B01J23/26C07C2523/26B01J2523/00B01J35/633B01J35/647B01J35/615B01J2523/12B01J2523/31B01J2523/48B01J2523/67B01J2523/3712C07C11/06Y02P20/52
Inventor 邵怀启姜涛许鑫培姚月周皓
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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