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Preparation method of catalyst layer in microchannel reactor

A micro-channel reactor, catalyst layer technology, applied in chemical instruments and methods, chemical/physical/physical chemical reactors, chemical/physical processes, etc., can solve the problem of increased processing costs, limited catalyst utilization, catalyst waste, etc. problems, to achieve the effect of improving performance and life, reducing ion state distribution, and good application prospects

Active Publication Date: 2017-06-13
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalytic layer prepared by the sol method will cause the catalytic layer to delaminate and fall off due to coating swelling and other reasons during use, resulting in a waste of catalyst and a sharp decline in the performance of the reactor. In severe cases, the reactor may even fail completely. use; in addition, the sol will cover a large number of catalyst particles, so that the active area is covered so that no catalytic effect can be produced, resulting in limited utilization of the catalyst
The catalytic layer prepared by the impregnation reduction method usually has good catalytic activity, but the roasting process (>400°C) is usually required in the preparation process, which puts forward higher requirements for the selection of materials for the preparation of microchannels, and also will increase the processing cost
Although the electroless deposition method has been reported, it is not enough to completely reduce the adsorbed ionic catalyst due to the weak reducing ability of the surface of the polydopamine layer that acts as bonding and reducing respectively, which greatly causes the catalyst to be damaged. Waste will also reduce the life and performance of the reactor itself

Method used

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  • Preparation method of catalyst layer in microchannel reactor
  • Preparation method of catalyst layer in microchannel reactor
  • Preparation method of catalyst layer in microchannel reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 Preparation of the catalyst layer in the microchannel reactor

[0031] To prepare the catalyst layer in the microchannel reactor, follow the steps below:

[0032] 1) Pretreatment of the inner wall of the microchannel:

[0033] Configure an alkaline solution (sodium hydroxide or potassium hydroxide solution) with a concentration of 0.1 to 5 mol / L; pass the alkaline solution into the microchannel of the reactor for 20 to 40 minutes at a flow rate of 0.2 to 0.5 mL / min through a syringe pump, In order to remove the trace grease attached to the surface of the channel; then use a syringe pump to inject deionized water into the microchannel at a flow rate of 0.5-2mL / min for 60min to remove the residual alkaline substances on the surface of the channel and the trace dust and other substances attached to the surface; finally Blow out the residual deionized water with a gas mass flow controller through nitrogen, and place it at room temperature for later use; the micro...

Embodiment 2

[0040] Example 2 Preparation of the catalyst layer in the microchannel reactor

[0041] To prepare the catalyst layer in the microchannel reactor, follow the steps below:

[0042] 1) A sodium hydroxide solution with a concentration of 0.1 mol / L was injected into a commercially available PTFE capillary pipe with an inner diameter of 0.6 mm and an outer diameter of 1 mm at a flow rate of 0.2 mL / min, and deionized water was introduced after 30 minutes, and its flow rate was set to 0.5mL / min, after 60min, use the gas mass flow controller to pass nitrogen to blow off the residual deionized water, and place it at room temperature for later use;

[0043] 2) The prepared dopamine aqueous solution is injected into the pretreated PTFE capillary pipeline with a flow rate of 1 mL / h by a syringe pump, and the dopamine aqueous solution is dissolved in a 10mM tris (Tris) aqueous solution. The mass concentration is 2g / L of dopamine solution; after the dopamine solution was continuously fed ...

Embodiment 3

[0046] Example 3 Preparation of the catalyst layer in the microchannel reactor

[0047] To prepare the catalyst layer in the microchannel reactor, follow the steps below:

[0048] 1) The potassium hydroxide solution with a concentration of 5 mol / L is injected into a commercially available PTFE capillary pipe with an inner diameter of 1.2 mm and an outer diameter of 1.6 mm at a flow rate of 0.5 mL / min, and deionized water is introduced after 30 min, and its flow rate is set to After 60min, the residual deionized water was blown off by nitrogen gas flow controller through a gas mass flow controller, and it was placed at room temperature for later use.

[0049] 2) The prepared dopamine aqueous solution is injected into the pretreated PTFE capillary pipeline with a flow rate of 4mL / h through a syringe pump, and the dopamine aqueous solution is dissolved in a 10mM tris (Tris) aqueous solution. The mass concentration is 1.5g / L of dopamine solution; after the dopamine solution was ...

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Abstract

The invention discloses a preparation method of a catalyst layer in a microchannel reactor, comprising the following steps: 1), pretreating an inner wall of a microchannel: flushing with an alkaline solution; 2), preparing a dopamine coating: injecting a prepared dopamine solution into the microchannel, flushing with deionized water, drying, and cooling for use; 3), non-electrochemically depositing a catalyst: fully filling the microchannel with a precursor solution containing catalyst anions, heating, continuously introducing the precursor solution, and flushing with deionized water; 4), reducing with a catalyst: placing the reactor in a resistance furnace, evacuating the resistance furnace, charging nitrogen, introducing hydrogen after secondary evacuation, introducing the hydrogen continuously, heating to 50-200 DEG C, maintaining reduction reaction for 4-8 hours, and cooling before extraction. Catalyst ionic distribution can be reduced, utilization rate is increased, a catalytic layer high in reaction activity and long in life is prepared in the microchannel, and the performance of the reactor is improved and the life thereof is prolonged significantly.

Description

technical field [0001] The invention relates to a preparation method of a catalyst layer in a reactor, in particular to a preparation method of a catalyst layer in a microchannel reactor. Background technique [0002] In various common chemical reactors including tank reactors, tower reactors, fixed bed reactors, fluidized bed reactors, etc., due to the existence of a large interphase mass transfer resistance, the reaction rate will be greatly affected . In order to overcome this shortcoming, the reaction pressure and temperature are usually increased to further overcome the mass transfer resistance and strengthen the reaction. However, this tends to increase manufacturing costs and increase the potential risk of explosion. Based on this, researchers have proposed a microreactor from the perspective of enhancing the transfer of substances between phases and shortening the transfer path, and research has proved that (Juta K, Yuichiro M, Kuniaki O, et al. Science, 2004, 304(...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00
CPCB01J19/0093B01J2219/00835
Inventor 朱恂冯浩陈蓉黄云付乾张亮丁玉栋廖强王宏李俊叶丁丁
Owner CHONGQING UNIV