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Nanoscale cobalt particle Fischer-Tropsch synthetic catalyst and preparation method thereof

A Fischer-Tropsch synthesis and nano-cobalt technology, which is applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc. It is beneficial to large-scale industrial production, improve the catalytic effect, and is beneficial to cost control.

Active Publication Date: 2013-04-10
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, most methods for preparing supported cobalt-based Fischer-Tropsch synthesis catalysts with uniformly dispersed nano-cobalt particles have special requirements for preparation conditions and reagents. The preparation process and reagent costs are not conducive to large-scale production, and the catalyst loading cannot be flexibly adjusted. The defects such as uneven particle size distribution and large interaction between the carrier and the active metal limit its application to a certain extent.

Method used

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  • Nanoscale cobalt particle Fischer-Tropsch synthetic catalyst and preparation method thereof
  • Nanoscale cobalt particle Fischer-Tropsch synthetic catalyst and preparation method thereof
  • Nanoscale cobalt particle Fischer-Tropsch synthetic catalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Disperse 0.6g of cobalt tetroxide nanoparticles with an average particle size of 5nm in 30ml of distilled water and put them in a round bottom flask, add 2.5g of γ-Al after ultrasonication for 10min 2 o 3 carrier, and then the carrier and particle mixture were stirred and ultrasonicated for 30 minutes to obtain a mixed slurry liquid. The mixed slurry liquid was vacuum-rotated on a rotary evaporator at 50 °C for 10 h, dried in an oven at 110 °C for 20 h, and then calcined in a muffle furnace at 350 °C for 8 h in an air atmosphere. A catalyst cat.1 containing 15 wt% of cobalt (calculated as cobalt element, the same below) was obtained, and the composition and size data of cobalt particles (cobalt tetroxide, the same below) in the catalyst cat.1 are listed in Table 1.

Embodiment 2

[0039] Disperse 0.6g of cobalt tetroxide nanoparticles with an average particle size of 7nm in 30ml of distilled water and put it in a round bottom flask, add 2.5g of γ-Al after ultrasonication for 10min 2 o 3 carrier, and then the carrier and particle mixture were stirred and ultrasonicated for 30 minutes to obtain a mixed slurry liquid. The mixed slurry liquid was dried by vacuum rotary evaporation on a rotary evaporator at 50°C for 10b, then dried in an oven at 110°C for 20h, and then calcined in a muffle furnace at 350°C for 8h in an air atmosphere. The catalyst cat.2 containing 15 wt% cobalt was obtained, and the composition and cobalt particle size data in the catalyst cat.2 are listed in Table 1.

Embodiment 3

[0041] Disperse 0.6g of cobalt tetroxide nanoparticles with an average particle size of 15nm in 30ml of distilled water and put it in a round bottom flask, add 2.5g of γ-Al after ultrasonication for 10min 2 o 3 carrier, and then the carrier and particle mixture were stirred and ultrasonicated for 30 minutes to obtain a mixed slurry liquid. The mixed slurry liquid was dried by vacuum rotary evaporation on a rotary evaporator at 50°C for 10b, then dried in an oven at 110°C for 20h, and then calcined in a muffle furnace at 350°C for 8h in an air atmosphere. The catalyst cat.3 containing 15 wt% cobalt was obtained, and the composition and cobalt particle size data in the catalyst cat.3 are listed in Table 1.

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Abstract

The invention relates to the technical field of Fischer-Tropsch synthetic catalyst preparation, and specially provides a nanoscale cobalt particle Fischer-Tropsch synthetic catalyst allowing flexible adjustment on a catalyst load capacity, nanoscale cobalt particle sizes and carrier types, and a preparation method thereof. The preparation method comprises preparing nanoscale cobalt particles intoa colloidal solution with appropriate concentration, immersing carriers into the colloidal solution, and mixing uniformly the nanoscale cobalt particles and the carriers in nanoscale by effects of ultrasound to realize interaction between the nanoscale cobalt particles and the carriers. The nanoscale cobalt particle Fischer-Tropsch synthetic catalyst prepared by the preparation method can load selectively with active metal particles having different sizes through different carriers, and thus selective adjustment on products is realized. Through adjustment produced by interaction between active metal and carriers, dispersity and reductibility of the nanoscale cobalt particle Fischer-Tropsch synthetic catalyst are improved simultaneously. Therefore, selective adjustment and high activity and stability of the nanoscale cobalt particle Fischer-Tropsch synthetic catalyst are realized simultaneously.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation for Fischer-Tropsch synthesis, in particular to a nano-cobalt particle Fischer-Tropsch synthesis catalyst and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis refers to the method in which synthesis gas (a mixture of carbon monoxide and hydrogen) is converted into hydrocarbons under the action of a catalyst. Usually, Fischer-Tropsch synthesis catalysts use Group VIII elements Fe, Co, Ni, Ru, and Rh as active metals, and cobalt-based Fischer-Tropsch synthesis catalysts are currently used in industry due to their high activity and high selectivity for long-chain hydrocarbons. more catalyst. Due to factors such as the price and activity of elemental metal cobalt, cobalt-based catalysts used in industry are usually supported cobalt-based catalysts made by loading cobalt on a certain type of carrier. [0003] In the field of Fischer-Tropsch catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J23/89B01J35/10C10G2/00
Inventor 李金林刘成超张煜华刘家举胡春玲
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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