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Catalyst for preparing olefin from low-carbon alkane by dehydrogenation and preparation method of catalyst

A catalyst and low carbon alkane technology, applied in the fields of hydrocarbons, hydrocarbons, chemical instruments and methods, etc., can solve the problems of increased propane cracking reaction, carbon deposition, accelerated catalyst deactivation rate, etc., and achieve high carbon capacity. , the effect of improving stability

Active Publication Date: 2016-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an excessively high reaction temperature will increase the propane cracking reaction, cause serious carbon deposition, and accelerate the catalyst deactivation rate. Therefore, the development of propane dehydrogenation catalysts with high activity, high selectivity and high stability has become the key to this technology

Method used

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  • Catalyst for preparing olefin from low-carbon alkane by dehydrogenation and preparation method of catalyst
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  • Catalyst for preparing olefin from low-carbon alkane by dehydrogenation and preparation method of catalyst

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preparation example Construction

[0020] The preparation method of catalyst provided by the invention comprises the steps:

[0021] (1) adding acid peptization to aluminum hydroxide to obtain alumina sol, adding a pore-enlarging agent and a compound containing the second metal component to the alumina sol, forming a drop ball,

[0022] (2) After drying the wet ball formed by the step drop ball in (1), perform one-stage calcination at 620-680°C, and then heat up to 900-1100°C for two-stage calcination to obtain the carrier.

[0023] (3) impregnating the carrier prepared in step (2) with a solution containing Group VIII metals and halogen-containing compounds, drying, and calcining at 400-650°C,

[0024] (4) impregnating the carrier obtained in step (3) with a water-soluble compound solution containing Group IA metal, drying, and calcining at 400-650°C.

[0025] In the above-mentioned method, (1) step is to form with alumina sol dropping ball, the pore-enlarging agent that adds in alumina sol (aluminum sol) is ...

example 1

[0043] The alumina support described in the present invention is prepared.

[0044] Take 27 g of aluminum flakes, add 610 g of hydrochloric acid solution with a concentration of 18% by mass to dissolve the aluminum flakes, and obtain a solution with an aluminum trichloride content of 4% by mass. Transfer the aluminum trichloride solution into a neutralization tank, add 850 grams of ammonia water with a concentration of 6% by mass, mix evenly at 60° C., and the pH value is 7.5 to 8.5. The generated aluminum hydroxide was filtered and washed, and 9 mL of nitric acid with a volume ratio of 1:1 was added to the filter cake to acidify to obtain a sol.

[0045] Add 40 mL of a solution containing 30 g of urea and a hydrochloric acid solution containing 32 g of stannous chloride to the sol under stirring, so that the Sn content in the solution is 0.32% by mass of the dry basis alumina, and stir for 1 hour to acidify. Then 30 g of kerosene and 3 g of fatty alcohol ethoxylates were add...

example 2

[0047] The alumina carrier was prepared according to the method of Example 1, except that 132 grams of aluminum hydroxide powder (produced by German Sasol Company, brand SB, with an alumina content of 76% by mass) was taken, and 100 mL of deionized water was added, and stirred for 1 hour to make the slurry Then add 9 mL of nitric acid with a volume ratio of 1:1 to acidify to obtain aluminum sol, and obtain tin-containing θ-Al 2 o 3 Carrier b, its physical properties are shown in Table 1.

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Abstract

The invention provides a catalyst for preparing olefin from low-carbon alkane by dehydrogenation. The catalyst comprises an aluminum oxide carrier and the following active components with the carrier as datum by mass: 0.1 to 2.0% of a group-VIII metal, 0.1 to 2.0% of a second metal component, 0.5 to 5.0% of a group-IA metal and 0.3 to 10.0% of halogen, wherein the aluminum oxide carrier has a pore volume of pores with a diameter of 2 to 10 nanometers accounting for 4 to 15% of a total pore volume, a pore volume of pores with a diameter of 10 to 20 nanometers accounting for 40 to 60% of the total pore volume, a pore volume of pores with a diameter of 20 to 50 nanometers accounting for 1.0 to 5.0% of the total pore volume, and a pore volume of pores with a diameter of more than 50 nanometers and less than 10 microns accounting for 20 to 50% of the total pore volume; and the second metal component is selected from the group consisting of tin, germanium, lead, indium, gallium or thallium. The catalyst is applied to preparation of propylene from propane by dehydrogenation and has high activity and selectivity and low coke deposition rate.

Description

technical field [0001] The invention relates to a catalyst for dehydrogenating alkanes to olefins and a preparation method thereof, in particular to a catalyst for dehydrogenating lower alkanes to olefins and a preparation method thereof. Background technique [0002] Propylene is an important basic organic chemical raw material, which is widely used in the production of various chemical products such as polypropylene, acetone, acrylonitrile, propylene oxide, and acrylic acid. At present, the supply of propylene mainly comes from the by-products of naphtha cracking to ethylene and petroleum catalytic cracking processes. Since the 1990s, with the increasing demand for propylene, the traditional propylene production process can no longer meet the demand for propylene in the chemical industry, and the development of other alternative process technologies must be accelerated. Among them, the process of propane dehydrogenation to propylene has attracted the most attention. By 2...

Claims

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Application Information

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IPC IPC(8): B01J23/62B01J35/10C07C5/333C07C11/06
CPCY02P20/52
Inventor 刘昌呈王春明马爱增
Owner CHINA PETROLEUM & CHEM CORP
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