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Carbon tube microcapsule catalyst and its preparation method and use

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: 2016-08-10
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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  • Carbon tube microcapsule catalyst and its preparation method and use
  • Carbon tube microcapsule catalyst and its preparation method and use
  • Carbon tube microcapsule catalyst and its preparation method and use

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. The carbon tube microcapsule catalyst comprises active nanometer carbon tubes and a molecular sieve. The active nanometer carbon tubes are inserted in the molecular sieve so that the catalyst with the active nanometer carbon tubes as cores and the molecular sieve as a shell is formed. The active nanometer carbon tube has an active metal load capacity of 2-30wt% and has length of 50-500nm. The molecular sieve has crystal sizes of 1-10 microns. The invention discloses a preparation method and a use of the carbon tube microcapsule catalyst. The active nanometer carbon tubes are inserted in the molecular sieve. Channel confinement effects of the active nanometer carbon tubes effectively match with molecular sieve acidity. A heavy component product can be effectively cracked. Molecule diffusion efficiency is high. Methane selectivity is low. Isomerous chain hydrocarbon selectivity is high. The preparation method has simple processes and a low cost and is suitable for large scale industrial application. The molecular sieve and the nanometer carbon tubes are effectively bonded so that mechanical strength is greatly improved.

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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IPC IPC(8): B01J29/48B01J35/02B01J37/10B82Y40/00C10G2/00
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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