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A kind of carbon tube microcapsule catalyst and its preparation method and application

A catalyst and microcapsule technology, which is applied in the field of carbon tube microcapsule catalyst and its preparation, can solve the problems of large molecular diffusion resistance, low mechanical strength, low metal dispersion, etc., to prevent the loss of active components of the catalyst and maintain mechanical stability Good, excellent structural performance

Active Publication Date: 2018-07-27
杭州催研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carriers of these nuclear catalysts have problems such as too long pores, uneven pore size, high molecular diffusion resistance, low dispersion of metals, and easy carbon deposition.
In addition, conventional capsule catalysts have too large particles and low mechanical strength, which limits the practical application of capsule catalysts.

Method used

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  • A kind of carbon tube microcapsule catalyst and its preparation method and application
  • A kind of carbon tube microcapsule catalyst and its preparation method and application
  • A kind of carbon tube microcapsule catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method of carbon tube microcapsule catalyst, comprising the steps of:

[0042] 1) Preparation of Co / CNTs precursor catalyst by over-volume impregnation method:

[0043] The carbon nanotubes were treated in 65wt% nitric acid at 120°C for 14h, washed with water to pH = 7, and dried; then treated with Co(NO 3 ) 2 ·6H 2 O is impregnated with a Co source, the active metal Co loading is 10wt%, vacuum treatment for 1h, drying at 120°C for 12h, and calcination at 350°C for 3h to obtain a precursor particle catalyst; the precursor particle catalyst is crushed into powder.

[0044] 2) Orthoethyl silicate (TEOS) is the silicon source, aluminum nitrate (Al(NO 3 ) 3 ) is the aluminum source, and tetrapropylammonium hydroxide (abbreviation: TPAOH) is the template agent; firstly, the active carbon nanotube powder, tetrapropylammonium hydroxide, aluminum nitrate, and ethanol are mixed by ultrasonic vibration, and dried after ultrasonic vibration; secondly, the Tetrap...

Embodiment 2

[0052] A kind of preparation method of carbon tube microcapsule catalyst, repeat embodiment 1, its difference is only in the treatment mode of carbon tube in Co / CNTs precursor catalyst, be about to carbon nanotube in 65wt% nitric acid 120 ℃ process 14h instead The carbon nanotubes were treated in 35wt% nitric acid at 120°C for 14h.

[0053] The obtained carbon tube microcapsule catalyst was used for the performance test of the fixed-bed Fischer-Tropsch synthesis reaction.

[0054] The evaluation of the Fischer-Tropsch reaction activity of the catalyst is the same as in Example 1, and the reaction results are shown in the table below.

[0055]

[0056] C n is paraffin; C ＝ is an alkene; C iso Isoparaffins; C ＝ / C n d for C 2 + Ratio of alkenes to paraffins; C iso / C n e for C 4 + Ratio of isoparaffins to paraffins

Embodiment 3

[0058] A method for preparing a carbon tube microcapsule catalyst, repeating Example 1, the difference is only in the cobalt source impregnation method, that is, the over-volume impregnation method is changed to the equal-volume impregnation method.

[0059] The obtained carbon tube microcapsule catalyst was used for the performance test of the fixed-bed Fischer-Tropsch synthesis reaction.

[0060] The evaluation of the Fischer-Tropsch reaction activity of the catalyst is the same as in Example 1, and the reaction results are shown in the table below.

[0061]

[0062] C n is paraffin; C ＝ is an alkene; C iso Isoparaffins; C ＝ / C n d for C 2 + Ratio of alkenes to paraffins; C iso / C n e for C 4 + Ratio of isoparaffins to paraffins

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Abstract

The invention discloses a carbon tube microcapsule catalyst, which includes active carbon nanotubes and molecular sieves. The active carbon nanotubes are embedded in the molecular sieve to form a catalyst with the active carbon nanotubes as the core and the molecular sieve as the shell. The active metal loading of the activated carbon nanotubes is 2 to 30 wt%, the length of the active carbon nanotubes is 50 to 500 nm, and the molecular sieve grain size is 1 to 10 μm. Its preparation method and application are also disclosed. In the catalyst of the invention, the active carbon nanotubes are embedded in the molecular sieve; the pore confinement effect of the active carbon nanotubes effectively matches the acidity of the molecular sieve, and the heavy component products can be effectively cracked; the molecular diffusion efficiency is high, the methane selectivity is low, and the isomeric chain hydrocarbons are It has high selectivity; the preparation process is simple, the cost is reduced, and it is suitable for large-scale industrial applications; the effective combination of molecular sieve and carbon nanotubes greatly improves the mechanical strength.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a carbon tube microcapsule catalyst and its preparation method and application. Background technique [0002] Energy is the basis for the survival and development of modern society. The supply capacity of clean fuel is related to the sustainable development of the national economy and is one of the foundations of national strategic security. Especially in the context of the gradual shortage of world oil resources and the increasingly prominent energy crisis, carbon-chemistry has been extensively studied and developed rapidly. Fischer-Tropsch synthesis, which is an important part, has also been developed rapidly. [0003] Fischer-Tropsch Synthesis (FTS) is the synthesis of coal, natural gas and biomass through synthesis gas (H 2 +CO) is a feasible technology for catalytic conversion of iron-based, cobalt-based and other catalysts into high-quality clean liquid fuels and high value-added...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48B01J35/02B01J37/10B82Y40/00C10G2/00B01J35/00
CPCC10G2/334B82Y40/00B01J21/185B01J29/48B01J37/10B01J2229/186B01J35/398B01J35/50
Inventor 邢闯申东明汪婧妍椿范立杨瑞芹
Owner 杭州催研科技有限公司
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