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 streng

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

Example Embodiment

[0032] Example 1:

[0033] Composite carrier preparation:

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

[0035] Catalyst load:

[0036] Dissolve 6.2 g of chromium acetate and 0.16 g of sodium nitrate in 10 ml of water, add 21.6 g of the above alumina-zirconia composite oxide, stir for 30 minutes, dry at room temperature for 18 hours, dry at 100°C for 12 hours, and calcinate at 750°C for 6 hours. Use a tablet press Pressed into a sheet shape to prepare propane dehydrog...

Example Embodiment

[0037] Example 2:

[0038] Composite carrier preparation:

[0039] Weigh 58g of P123 and dissolve it in 1000ml of absolute ethanol to prepare solution 1; Weigh 4.6g of cerium nitrate and 81.6g of aluminum isopropoxide in 500ml of 70% nitric acid aqueous solution to prepare solution 2; dissolve solution 2 within 30 minutes Add dropwise to solution 1, and stir for 4h until fully mixed. The solution was slowly heated to 60° C., heated at the temperature for 42 hours, and the solvent was evaporated to obtain a white powder, which was calcined at 650° C. for 4 hours to obtain an alumina-cerium oxide 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 alumina-cerium oxide composite oxide, stir for 30min, dry at room temperature for 24h, 100℃ for 12h, 750℃ for 6h, use tablet press It is pressed into a sheet shape to obtain a propane dehydrogenation catalyst B. The content of cerium...

Example Embodiment

[0042] Example 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 alumina-zirconia composite oxide, stir for 30min, extrude it, dry at room temperature for 24h, 100℃ for 12h, 750℃ for 6h , Prepared propane dehydrogenation catalyst C. The content of zirconium oxide in the catalyst 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 based on the weight of alumina.

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

[0047] Table 1 Physical properties of the catalysts obtained in each example

[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
CPCY02P20/52B01J23/002B01J23/26B01J35/1019B01J35/1038B01J35/1061B01J2523/00C07C5/3332C07C2523/26B01J2523/12B01J2523/31B01J2523/48B01J2523/67B01J2523/3712C07C11/06
Inventor 邵怀启姜涛许鑫培姚月周皓
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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