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Preparation method of propane dehydrogenation catalyst

A propane dehydrogenation and catalyst technology, which is applied in catalyst activation/preparation, catalysts, carbon compound catalysts, etc., can solve the problems of rapid decline in olefin selectivity, poor stability, and low dehydrogenation catalyst activity, and improve the propane dehydrogenation activity. and the effect of propylene selectivity

Pending Publication Date: 2022-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst preparation steps are complicated, and the oxidized catalyst obtained after calcination needs to be presulfurized with hydrogen sulfide
[0006] CN105582929A discloses a catalyst for dehydrogenation of low-carbon alkanes and its preparation method, which mainly solves the problems of low activity and poor stability of dehydrogenation catalysts prepared in the prior art
The catalyst is used in the reaction of propane dehydrogenation to propylene, and the selectivity of olefins decreases rapidly, and also involves the recovery of high content of Pt

Method used

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  • Preparation method of propane dehydrogenation catalyst
  • Preparation method of propane dehydrogenation catalyst
  • Preparation method of propane dehydrogenation catalyst

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preparation example Construction

[0018] There are two preparation methods of the oxidized propane dehydrogenation catalyst in the present invention, the first one is prepared by impregnation method; the second one is prepared by drop ball method.

[0019] The first preparation method of the oxidized propane dehydrogenation catalyst of the present invention comprises impregnating the alumina carrier with a manganese-containing compound solution, followed by drying and calcining.

[0020] The second preparation method of the oxidized propane dehydrogenation catalyst of the present invention comprises forming the manganese compound-containing alumina sol into balls, drying and calcining.

[0021] In the first preparation method, the alumina is preferably γ-alumina or θ-alumina. The alumina support used can be spherical, strip-shaped or clover-shaped. The temperature for impregnating alumina with manganese-containing compound solution is preferably 20-70°C, and the impregnated liquid / solid ratio is preferably 1....

example 1

[0033] The propane dehydrogenation catalyst described in the present invention is prepared.

[0034] (1) Take 0.28g of manganese acetate and dissolve it in 30ml of deionized water to make an impregnating solution, and take 20.0g of it with a specific surface area of ​​210m 2 / g, the pore volume is 0.5cm 3 / g γ-Al 2 o 3 Small balls, the average diameter of the small balls is 1.6 mm. The γ-Al 2 o 3 The small ball carrier is placed in the impregnation solution, stirred at 25°C for 0.5h, and left to stand for 4h for impregnation. The solid / liquid ratio of impregnation is 1.5g / ml, then dried at 120°C for 12h, and calcined at 550°C for 6h to obtain the catalyst in the oxidation state .

[0035] (2) Get the above-mentioned oxidation state catalyst, pass into propane and H 2 The mixed gas mixed at a volume ratio of 0.7:1 is subjected to reduction treatment at 580°C for 0.5h, and the mass space velocity of the mixed gas passing through the oxidized catalyst is 4.2h -1 , to obta...

example 2

[0037] Catalyst was prepared according to the method of example 1, except that the manganese acetate used in (1) step preparation impregnation solution was 0.56g, and the obtained oxidized catalyst was reduced by (2) step method to obtain catalyst B. The Mn content in Catalyst B is 1.0% by mass, and its composition is shown in Table 2.

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Abstract

A preparation method of a propane dehydrogenation catalyst comprises the steps that an oxidation-state propane dehydrogenation catalyst is subjected to reduction treatment through mixed gas of C1-C3 alkanes and H2 at the temperature of 500-700 DEG C, and the oxidation-state propane dehydrogenation catalyst comprises an aluminum oxide carrier and manganese with the content being 0.5-10% by mass on the basis of the carrier. The catalyst prepared by the method is used for preparing propylene through propane dehydrogenation and has relatively high activity and selectivity.

Description

technical field [0001] The invention relates to a preparation method of a low-carbon alkane dehydrogenation catalyst, in particular to a preparation method of a propane dehydrogenation catalyst. Background technique [0002] Propylene is the most consumed basic organic chemical raw material except ethylene. Propylene products such as polypropylene, acrylonitrile, propylene oxide, and acrylate are closely related to people's production and life. Propane dehydrogenation process is an important method to produce propylene. [0003] The currently industrialized propane catalytic dehydrogenation to propylene technology mainly includes UOP's Oleflex technology and Lummus's Catofin technology. The Oleflex process uses a moving bed reactor with continuous regeneration of the catalyst, using Pt-Sn / Al 2 o 3 As a catalyst, adding K or Li etc. for modification, the catalyst has high activity and good stability, but the cost of the catalyst is high; the Catofin process uses a fixed-be...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/02B01J37/08B01J37/18C07C5/333C07C11/06
CPCB01J23/34B01J37/0203B01J37/082B01J37/18C07C5/3335C07C2523/34C07C11/06Y02P20/52
Inventor 刘泽超刘昌呈马爱增王春明
Owner CHINA PETROLEUM & CHEM CORP
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