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Catalyst for preparing ethylene by selective hydrogenation of acetylene, preparation method and application

A catalyst and selective technology, applied in catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high cost and high energy consumption, and achieve the effects of long service life, low cost and high yield

Active Publication Date: 2019-08-23
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is a catalyst for preparing ethylene by selective hydrogenation of acetylene and its preparation method and application, which can solve the problems of high cost and high energy consumption of noble metal catalysts in traditional production processes

Method used

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  • Catalyst for preparing ethylene by selective hydrogenation of acetylene, preparation method and application
  • Catalyst for preparing ethylene by selective hydrogenation of acetylene, preparation method and application
  • Catalyst for preparing ethylene by selective hydrogenation of acetylene, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve a certain amount of soluble nickel salt (nitrate) in water to obtain a nickel salt solution, then fully stir with an organic amine (diethylenetriamine) complexing agent for 30 minutes, and then follow the H 2 0:Si0 2 =20, Ni:Si0 2 =0.08, NaOH:Si0 2 =0.7, Al:Si0 2 The ratio of =0.1 was added sequentially to sodium metaaluminate, sodium hydroxide and silica sol and fully stirred for 100 minutes to obtain an initial gel.

[0025] Put the initial gel into the autoclave, statically crystallize at 120°C for 100h, cool to room temperature, filter and wash the product until neutral, dry it in an oven at 100°C for 12h, and then bake it in a muffle furnace at 550°C for 6h .

[0026] Put the calcined samples into 1mol / L lithium nitrate, sodium nitrate and potassium nitrate solutions respectively, conduct ion exchange for 12 hours in a water bath at 80°C, dry and calcinate to obtain Ni-Li-silicon-aluminum molecular sieves (named as Ni- Li-Z), Ni-Na-silicon-alumina mol...

Embodiment 2

[0035] The catalyst used in this example is Ni-Na-Z. The influence of the continuous reaction time on the selective hydrogenation activity of Ni-Na-Z catalyst in acetylene was investigated. The catalytic performance evaluation is shown in Table 2:

[0036] Table 2 Effect of continuous reaction time on the activity of Ni-Na-Z in the selective hydrogenation of acetylene

[0037]

[0038] The results of catalytic performance evaluation show that within a certain time range, as the continuous reaction time increases, the conversion rate of acetylene and the selectivity of ethylene can remain relatively stable, and when the reaction time reaches 40h, the catalytic activity decreases slightly, indicating that Ni- The catalyst of Na-Z system has excellent catalytic stability.

Embodiment 3

[0040] The catalyst used in this example is Ni-Na-Z. The influence of different ratios of hydrogen and acetylene on the Ni-Na-Z catalyst's selective hydrogenation activity of acetylene was investigated. The catalytic performance evaluation is shown in Table 3:

[0041] Table 3 Effects of different hydrogen-alkyne ratios on the activity of Ni-Na-Z in the selective hydrogenation of acetylene

[0042]

[0043] The results of catalytic performance evaluation showed that with the increase of hydrogen-alkyne ratio, the conversion of acetylene gradually increased and then stabilized, while the selectivity of ethylene showed a trend of first increasing and then decreasing. Therefore, considering comprehensively, when the ratio of hydrogen to acetylene is 15:1, the yield of ethylene reaches 97.7%, which is an ideal reaction condition.

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Abstract

The invention relates to a catalyst for preparing ethylene through acetylene selective hydrogenation, and a preparation method and application thereof. The catalyst comprises nickel as the main active component, composited base metal and a silicon aluminum molecular sieve as carriers, wherein the load amount of the nickel is 0.2-20% of the of the catalyst mass, and the base metal accounts for 0.8-8% of the catalyst mass. The preparation method includes the steps of using water heat to synthesize a catalytic system of Ni-M (base metal)-silicon aluminum molecular sieve, and using the system for acetylene selective hydrogenation to produce ethylene. The preparation method solves the problems that in the traditional process, noble metal catalysts is high in production costs and energy consumption of technological processes and the like. The catalyst has the advantages of low costs, easy availability, a simple preparation process, high catalytic activity and good stability; moreover, under relatively mild conditions, when the catalyst is used in the process of acetylene selective hydrogenation, the catalyst has excellent catalytic activity and selectivity, and can be used in industrial production of selective acetylene hydrogenation.

Description

technical field [0001] The invention relates to a catalyst for preparing ethylene by selective hydrogenation of acetylene, its preparation method and application, specifically the construction of Ni-M-silicon aluminum molecular sieve system and its application in selective hydrogenation of acetylene, and the hydrothermal synthesis of Ni-M (Alkali metal)-silico-alumina molecular sieve catalytic system and its application to the selective hydrogenation of acetylene to ethylene. Background technique [0002] As a raw material for many chemical products and a monomer for synthetic polymers, ethylene is mostly produced by pyrolysis of petroleum hydrocarbon steam. A certain amount of acetylene will be produced in the process of hydrocarbon steam cracking to ethylene. The presence of acetylene will poison and deactivate the catalyst in the polyolefin production process. The separation or removal of acetylene is one of the important processes in the ethylene plant process. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/24B01J29/76B01J29/46B01J37/08B01J37/10C07C5/09C07C11/04C01B39/04
Inventor 李兰冬柴玉超武光军戴卫理关乃佳
Owner NANKAI UNIV
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