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Catalyst for selective hydrogenation of acetylene to ethylene and preparation method thereof

A technology for selective hydrogenation and ethylene production, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of easy aggregation of active components and adverse active components Dispersion, catalytic efficiency decline and other problems, to achieve the effect of improving catalytic activity, accelerating desorption rate, and preventing active metal agglomeration

Active Publication Date: 2017-06-13
北京锦泰诚瑞科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of carbon fiber is relatively inert, and the direct use of carbon fiber as a carrier to support precious metals is not conducive to the dispersion of active components. After a period of use, the active components are easy to agglomerate, resulting in a great drop in catalytic efficiency.

Method used

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  • Catalyst for selective hydrogenation of acetylene to ethylene and preparation method thereof
  • Catalyst for selective hydrogenation of acetylene to ethylene and preparation method thereof
  • Catalyst for selective hydrogenation of acetylene to ethylene and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1 A kind of preparation method of acetylene selective hydrogenation ethylene catalyst

[0024] Proceed as follows:

[0025] (1) Take 10 g of PAN-based carbon fiber cloth (fiber diameter 10 μm), soak it in dilute nitric acid for 2 hours, take it out, rinse it with deionized water, and dry it at 80°C to obtain pretreated carbon fiber for later use;

[0026] (2) Prepare aluminum sol by sol-gel method (viscosity is 0.012Pa.s, sol concentration is 1.2mol / L), soak the pretreated carbon fiber for 6h, take out, remove excess sol, dry at 100°C for 2h, repeat dipping and drying for 3 Second, calcined at 600 °C for 3 h under high-purity argon atmosphere; the transmission diagram of the modified catalyst support is shown in figure 1 As shown, the surface of the carbon fiber is coated with a 150nm alumina coating; and then roasted at 350°C for 2 hours in an atmosphere with an oxygen content of 0.5%, to obtain a carrier-modified carbon fiber. The scanning electron microsc...

Embodiment 2

[0028] Embodiment 2 A kind of preparation method of acetylene selective hydrogenation ethylene catalyst

[0029] Proceed as follows:

[0030] (1) Get 12g of pitch-based carbon fiber (fiber diameter 5 μm), and remove the surface coating by gas phase oxidation to obtain pretreated carbon fiber, which is set aside;

[0031] (2) Prepare silica sol (viscosity 0.010 Pa.s, sol concentration 1mol / L) by sol-gel method, soak carbon fiber for 2 hours, take out, remove excess sol, dry at 80°C for 4 hours, repeat dipping and drying twice, high Calcined at 550°C for 3h under pure argon atmosphere. Calcined at 550°C for 1 hour in an atmosphere with a water vapor content of 0.5%, to obtain carrier-modified carbon fibers;

[0032] (3) The active component precursor Pd and the co-catalyst precursor Ag were loaded on the modified carbon fiber by impregnation method, dried at 80 °C for 6 h, and roasted at 750 °C for 2 h under the protection of high-purity argon. The loading amount of Pd was 1% ...

Embodiment 3

[0033] Embodiment 3 A kind of preparation method of acetylene selective hydrogenation ethylene catalyst

[0034] Proceed as follows:

[0035] (1) Take 8 g of PAN-based carbon fiber filaments (fiber diameter 0.5 μm), remove the glue in a resistance furnace, and obtain pretreated carbon fibers for future use;

[0036] (2) Prepare titanium sol by sol-gel method (viscosity is 0.065Pa.s, sol concentration is 1.5mol / L), soak carbon fiber for 2h, take it out, remove excess sol, dry at 60°C for 4h, repeat dipping and drying for 4 times , calcined at 550°C for 4h in a high-purity argon atmosphere, and calcined at 450°C for 1.5h in an atmosphere with an oxygen content of 6%, to obtain carrier-modified carbon fibers;

[0037] (3) Load the active component precursor Pd and the co-catalyst precursor K and La on the modified carbon fiber by impregnation method, dry at 60°C for 4h, and bake at 550°C for 2h under the protection of high-purity argon. 0.6%, the K loading is 3% of the mass of ...

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Abstract

The invention relates to a preparation method of a catalyst for preparing ethylene through acetylene selective hydrogenation. The preparation method comprises the following steps: soaking carbon fiber pretreated in sol, and performing drying, roasting and oxidation corrosion after taking out the carbon fiber to obtain modified carbon fiber; loading an active component and assistant catalysis components on the modified carbon fiber through an impregnation method, and drying and roasting to obtain the catalyst for preparing ethylene through acetylene selective hydrogenation. A discontinuous coating is formed on the surface of the carbon fiber by using a sol-oxidation corrosion-impregnation technology to form a space obstacle to stop active metal agglomeration; the coating adjusts the surface property and the acidity of the carbon fiber, and facilitates improvement on the catalytic activity and the ethylene yield.

Description

technical field [0001] The invention relates to a catalyst for producing ethylene by selective hydrogenation of acetylene and a preparation method thereof, belonging to the technical field of preparation of petrochemical catalysts. Background technique [0002] Ethylene is one of the basic raw materials for the preparation of polyethylene, but the ethylene produced by cracking usually contains a small amount of alkynes, resulting in poor performance of the obtained polyethylene, and even an explosion hazard. Therefore, selective catalytic hydrogenation is usually used in ethylene production to remove alkyne concentration to the lowest level (such as mole fraction <10 -6 ) to meet the requirements of polymerization raw materials, while increasing ethylene production and improving resource utilization. [0003] Compared with traditional supports, carbon fiber has many advantages, such as controllable micropore structure, strong interface effect, mesopore characteristics, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J23/83B01J23/825C07C11/04C07C5/09
CPCY02P20/52
Inventor 余海鹏史雪君闫琛洋吴道洪
Owner 北京锦泰诚瑞科技发展有限公司
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