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Low-temperature Fischer-Tropsch synthesis iron-based catalyst reduction method

An iron-based catalyst, Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., to achieve the effects of good reduction effect, improved selectivity and complete sphericity

Pending Publication Date: 2022-01-07
YANCON YULIN FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, many reduction techniques can obtain catalysts in the reduced active state with good performance. However, there is no prior art that discloses that the reduction process can better maintain the appearance of the catalyst.

Method used

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  • Low-temperature Fischer-Tropsch synthesis iron-based catalyst reduction method
  • Low-temperature Fischer-Tropsch synthesis iron-based catalyst reduction method
  • Low-temperature Fischer-Tropsch synthesis iron-based catalyst reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add the mixed slurry with a solid content of 28% catalyst and liquid paraffin (preheated to 180°C, fed by nitrogen pressure) into a nitrogen-filled slurry bed reactor (the empty reactor is preheated to 180°C by an electric heater) , continuously feed fresh reducing gas into the reactor (the reducing gas is introduced from the water gas production site, and is purified by low-temperature methanol washing, molecular sieve and other processes).

[0032] Reactor heating process: 180°C→200°C, heating rate 3°C / h.

[0033] Catalyst active component reduction stage: the reduction temperature is 200°C, the time is 16h, the pressure is 1.5MPa, and the space velocity is 3500mL(N) / g catalyst / h.

[0034] Catalyst active component activation stage: the activation temperature is 200°C, the time is 19h, the pressure is 1.5MPa, and the space velocity is 4000mL(N) / g catalyst / h.

[0035] The experimental results are as follows:

[0036]

[0037] Compared with the normal reduction sam...

Embodiment 2

[0039] Add the mixed slurry with a solid content of 33% catalyst and liquid paraffin (preheated to 180°C, fed by nitrogen pressure) into the nitrogen-filled slurry bed reactor (the empty reactor is preheated to 180°C by an electric heater) , continuously feed fresh reducing gas into the reactor (the reducing gas is introduced from the water gas production site, and is purified by low-temperature methanol washing, molecular sieve and other processes).

[0040] The heating process of the reactor: 180°C→230°C, the heating rate is 7°C / h.

[0041] Catalyst active component reduction stage: the reduction temperature is 230° C., the time is 13 hours, the pressure is 1.8 MPa, and the space velocity is 4000 mL(N) / g catalyst / h.

[0042] Catalyst active component activation stage: the activation temperature is 230°C, the time is 17h, the pressure is 1.8MPa, and the space velocity is 4300mL(N) / g catalyst / h.

[0043] The experimental results are as follows:

[0044]

[0045] Compared ...

Embodiment 3

[0047]Add the mixed slurry with a solid content of 40% catalyst and liquid paraffin (preheated to 180°C, fed by nitrogen pressure) into the nitrogen-filled slurry bed reactor (the empty reactor is preheated to 180°C by an electric heater) , continuously feed fresh reducing gas into the reactor (the reducing gas is introduced from the water gas production site, and is purified by low-temperature methanol washing, molecular sieve and other processes).

[0048] Reactor heating process: 180°C→240°C, heating rate 9°C / h.

[0049] Catalyst active component reduction stage: the reduction temperature is 240°C, the time is 28h, the pressure is 2.3MPa, and the space velocity is 4500mL(N) / g catalyst / h.

[0050] Catalyst active component activation stage: the activation temperature is 240°C, the time is 24h, the pressure is 2.3MPa, and the space velocity is 4800mL(N) / g catalyst / h.

[0051] The experimental results are as follows:

[0052]

[0053] Compared with the normal reduction sa...

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Abstract

The invention discloses and provides a low-temperature Fischer-Tropsch synthesis iron-based catalyst reduction method, and aims to solve the technical problems that the catalyst is broken in shape, low in reduction degree, poor in initial activity, short in service cycle and the like. According to the present invention, the microspherical structure of the catalyst is completely maintained before and after the reduction by using the method, the microspherical iron-based catalyst is prepared by spray drying, the main components comprise Fe, Cu, SiO2 and K2O, the mass ratio of the Fe to the Cu to the SiO2 to the K2O is 100: (3-8): (12-35): (0-9), the particle size distribution range of the iron-based catalyst is 20-300 [mu]m, and the average particle size is 80-200 [mu]m; and the method is suitable for a slurry bed synthesis reactor and a fluidized bed synthesis reactor, and has great market application and popularization prospects.

Description

technical field [0001] The invention relates to the technical field of low-temperature Fischer-Tropsch synthesis catalyst reduction, in particular to a method for reducing a low-temperature Fischer-Tropsch synthesis iron-based catalyst. Background technique [0002] Fischer-Tropsch synthesis is the synthesis of CO and H 2 The process of converting (usually from coal or natural gas) into liquid fuels or chemicals. Fischer-Tropsch synthesis catalyst is the key and core technology of indirect coal liquefaction. It is a complex technical system with a development history of nearly a hundred years. [0003] The active components of low-temperature Fischer-Tropsch synthesis catalysts are mainly group VIII transition metal elements. Group VIII transition metal elements (including Fe, Co, Ni, Ru, etc.) are not only capable of moderately dissociating CO, but also relatively stable, and are relatively suitable metal elements for Fischer-Tropsch reactions. Among them, Fe element has...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J35/08B01J37/16B01J37/18C10G2/00
CPCB01J23/78B01J37/18B01J37/16C10G2/332B01J35/51
Inventor 巩守龙杨霈霖刘付亮贺小亮郑晓玮白兴芹
Owner YANCON YULIN FINE CHEM CO LTD
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