Preparation method of composite carrier catalyst and low-carbon chain olefin

A composite carrier and catalyst technology, applied in the direction of carbon compound catalysts, catalysts, molecular sieve catalysts, etc., can solve the problems of catalyst deactivation, difficult treatment, and blockage of catalyst pores, and achieve high selectivity, low cost, and simple preparation process. Effect

Inactive Publication Date: 2018-06-08
BEIJING HUAFU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are few studies on the preparation of low-carbon alkenes based on acetylene polymerization and hydrogenation, especially the preparation of ethylene and butadiene.
[0003] In the prior art, butadiene is synthesized using a silica gel-supported palladium-lead bimetall

Method used

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  • Preparation method of composite carrier catalyst and low-carbon chain olefin
  • Preparation method of composite carrier catalyst and low-carbon chain olefin
  • Preparation method of composite carrier catalyst and low-carbon chain olefin

Examples

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preparation example Construction

[0040] A method for preparing a composite carrier catalyst disclosed in an embodiment of the present invention includes:

[0041] Step 1 prepares the SAPO-34 molecular sieve carrier with multi-level channels:

[0042] Step 11 prepares initial gel mixture;

[0043] Step 12: Perform crystallization treatment on the initial gel mixture, pass a mixed gas of acetylene and hydrogen during the crystallization treatment process, and repeatedly inflate and deflate the gas, and press to a predetermined pressure to obtain SAPO-34 molecular sieve raw powder ;

[0044] In step 13, the SAPO-34 molecular sieve raw powder is roasted to obtain a SAPO-34 molecular sieve carrier, wherein the roasting can be carried out in a muffle furnace, and the preferred roasting temperature is 500-550° C., and the roasting time is 6-10 hours. The heating rate is less than or equal to 5°C / min. When the calcination temperature is lower than 500°C, the removal of the template agent is incomplete. When the tem...

Embodiment 1

[0064] This embodiment discloses a method for preparing a composite carrier catalyst and a method for preparing a low-carbon chain system using the composite carrier catalyst. The composite carrier catalyst includes a composite carrier and an active component. The composite support includes hierarchically porous SAPO-34 and nano α-Al 2 o 3 Composite after treatment, the active components are Pd, Cu and K. The carrier compounding adopts a mechanical ball milling method, the preparation method of the catalyst adopts equal-volume impregnation, and the composite carrier catalyst is obtained after impregnation and roasting. Using the composite carrier catalyst prepared in this example, under certain conditions, hydrogen and acetylene are used to react in a fluidized bed to prepare low-carbon alkenes, especially ethylene and butadiene products.

[0065] Among them, in the composite supported catalyst, α-Al 2 o 3 The ratio of the mass fraction of SAPO-34 to the multi-stage channe...

Embodiment 2

[0082] The difference from Example 1 is that in the step (3), the volume ratio of acetylene and hydrogen is 1:5; in the step (10), the volume ratio of acetylene and hydrogen is 1:5.

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Abstract

The invention relates to a preparation method of a composite carrier catalyst and low-carbon chain olefin. The preparation method of the composite carrier catalyst comprises the following steps of crystallizing an initial gel mixture, introducing the mixed gas of acetylene and hydrogen in the crystallizing process, repeatedly charging and discharging gas, and then punching, so as to obtain a composite carrier with an SAPO-34 molecular sieve carrier; loading active components onto the composite carrier, so as to obtain the composite carrier catalyst. The preparation method of the low-carbon chain olefin comprises the following steps of using hydrogen to reduce the catalyst, mixing the acetylene and the hydrogen, and reacting with the catalyst, so as to obtain the low-carbon chain olefin. The preparation method has the advantages that by adopting the special crystallizing method, the prepared composite carrier catalyst has double active centers, the hydrogenation reaction and polymerization reaction can be realized, and the one-step preparation effect of the low-carbon chain olefin can be realized; the preparation process is simple, the catalyzing efficiency is high, and the cost islow; by adjusting the proportional ratio of the hydrogen and the acetylene, the distribution of the low-carbon chain olefin product can be adjusted, and the selectivity is high in the preparation process of the low-carbon chain olefin.

Description

technical field [0001] The invention relates to the technical field of catalyst and olefin preparation, and more specifically, to a composite carrier catalyst and a method for preparing low-carbon olefins. Background technique [0002] Low-carbon olefins generally refer to olefins with 4 or less carbon atoms, such as ethylene, propylene, and butene. Low-carbon olefins are the most basic raw materials for petrochemical production, and can be used to produce organic compounds such as polyethylene, polypropylene, acrylonitrile, ethylene oxide or ethylene glycol. There are two main methods for preparing low-carbon olefins: one is the petroleum route; the other is the non-petroleum route. my country's oil resources are relatively scarce, and coal and natural gas resources are relatively rich. Based on our energy structure, the development of coal chemical and natural gas chemical technology is in line with our national conditions. At present, the feasible technical routes of lo...

Claims

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Application Information

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IPC IPC(8): B01J29/85C07C5/05C07C2/74C07C11/04C07C11/06C07C11/08
CPCY02P20/52B01J29/85C07C2/74C07C5/05C07C2529/85C07C11/04C07C11/06C07C11/08
Inventor 史东军何杉史雪君黄伟杜波吴道洪
Owner BEIJING HUAFU ENG
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