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Process method for treating carbon fiber production process waste gas by using molecular sieve catalyst

A production process and catalyst technology, which is applied in the application and treatment field of molecular sieve catalysts, can solve the problems that cannot be processed at the same time, and achieve the effect of convenient operation

Active Publication Date: 2022-08-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that existing catalysts cannot simultaneously treat 3 ) carbon fiber production process waste gas problem, provide a transition metal-supported molecular sieve catalyst, the catalyst can simultaneously process multiple harmful components in the carbon fiber production process waste gas under low temperature conditions, into N 2 , CO 2 and H 2 O, and the product nitrogen selectivity is high, and there is basically no NO in the tail gas after treatment x

Method used

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  • Process method for treating carbon fiber production process waste gas by using molecular sieve catalyst
  • Process method for treating carbon fiber production process waste gas by using molecular sieve catalyst
  • Process method for treating carbon fiber production process waste gas by using molecular sieve catalyst

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Experimental program
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Effect test

Embodiment 1

[0037] 1. Catalyst preparation

[0038] Take a certain amount of copper nitrate (weighed by the mass fraction of 5% Cu) and dissolve it in 200ml of deionized water to prepare a solution, and weigh 2.0g of SiO 2 / Al 2 O 3 = 30 H-ZSM-5 molecular sieves, mixed with the solution, fully stirred in a 40°C water bath for 8 hours, then slowly evaporated the water in the solution by a rotary vacuum evaporator, and then dried in a 110°C oven for 2 hours, Then, the temperature was raised to 550 °C for 4 h at a rate of 2 °C / min in an atmosphere of normal pressure air, and the obtained calcined product was a 5% Cu-ZSM-5 catalyst.

[0039] 2. Catalyst evaluation

[0040] The prepared catalyst was placed in a micro-fixed-bed quartz reactor, and the exhaust gas and O 2 (3vol%) mixed gas, the total flow is 100ml / min, and the air velocity of the mixed gas is 20000h -1, the reaction temperature range is 200 ~ 600 ℃. On-line gas quantitative analysis was performed using a Nicolet Nexus 470 ...

Embodiment 2

[0042] 1. Catalyst preparation

[0043] Take a certain amount of copper nitrate (weighed according to the mass fraction of 5% Cu load) and dissolve it in 200ml of deionized water to prepare a solution, and weigh 2.0g of SiO 2 / Al 2 O 3 = 30 H-Beta molecular sieves, mixed with the solution, fully stirred in a 40°C water bath for 8 hours, and then slowly evaporated the water in the solution by a rotary vacuum evaporator, then dried in a 110°C oven for 2 hours, and then placed in a rotary vacuum evaporator. The temperature was raised to 550 °C for 4 h at a rate of 2 °C / min in an atmosphere of normal pressure air, and the obtained calcined product was a 5% Cu-Beta catalyst.

[0044] 2. Catalyst evaluation

[0045] The prepared catalyst is placed in a micro-fixed-bed quartz reactor, and a certain amount of carbon fiber production process waste gas and O 2 (3vol%) mixed gas, the total flow is 100ml / min, and the air velocity of the mixed gas is 20000h -1 , the reaction temperatu...

Embodiment 3

[0047] 1. Catalyst preparation

[0048] Take a certain amount of copper nitrate (weighed according to the mass fraction of 5% Cu load) and dissolve it in 200ml of deionized water to prepare a solution, and weigh 2.0g of SiO 2 / Al 2 O 3 = 30 H-ZSM-35 molecular sieves, mixed with the solution, fully stirred in a 40°C water bath for 8 hours, then slowly evaporated the water in the solution by a rotary vacuum evaporator, and then dried in a 110°C oven for 2 hours, Then, the temperature was raised to 550 °C for 4 h at a rate of 2 °C / min in an atmosphere of normal pressure air, and the obtained calcined product was a 5% Cu-ZSM-35 catalyst.

[0049] 2. Catalyst evaluation

[0050] The prepared catalyst is placed in a micro-fixed-bed quartz reactor, and a certain amount of carbon fiber production process waste gas and O 2 (3vol%) mixed gas, the total flow is 100ml / min, and the air velocity of the mixed gas is 20000h -1 , the reaction temperature is 200 ~ 600 ℃. On-line gas quant...

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Abstract

A process method for treating waste gas in a carbon fiber production process by using a molecular sieve catalyst belongs to the field of waste gas treatment, at least one of ZSM-5, Beta, SSZ-13, Y, ZSM-35, MOR, MCM-22 and MCM-49 molecular sieves is used as a carrier, one or more of transition metals Cu, Co, Fe, Mn and Ni is / are used as an active center, and the catalyst simultaneously removes various harmful components at a low temperature, so that the carbon fiber production process waste gas can be treated by using the molecular sieve catalyst. And the catalyst has relatively high catalytic purification activity and product nitrogen selectivity.

Description

technical field [0001] The invention belongs to the field of exhaust gas purification, in particular to the application and treatment method of a molecular sieve catalyst for simultaneously treating various harmful components in the exhaust gas of a carbon fiber production process. technical background [0002] Carbon fiber has the characteristics of high strength, high modulus, high temperature resistance, corrosion resistance, fatigue resistance, creep resistance, and excellent electrical and thermal conductivity. Since its inception in the 1950s, it has become an indispensable engineering material for the military and aerospace industries. In the production process of polyacrylonitrile (PAN)-based carbon fiber, intramolecular and intermolecular crosslinking, cyclization, and condensed cyclization of PAN occur, gradually forming a turbostratic graphite structure, and producing a large amount of volatile small molecular substances (such as HCN, NH 3 , CO, CO 2 , H 2 , N ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J29/03B01J29/24B01J29/46B01J29/48B01J29/68B01J29/76F23G7/07
CPCB01J29/46B01J29/48B01J29/7615B01J29/68B01J29/24B01J29/7676B01J29/0333B01J23/72F23G7/07B01J2229/18Y02A50/20
Inventor 张润铎康彬
Owner BEIJING UNIV OF CHEM TECH
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