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Catalyst used for catalytic combustion of VOCs and capable of resisting alkali metal poisoning and preparation method of catalyst

A catalytic combustion and catalyst technology, applied in combustion methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of not fully meeting the requirements of anti-alkali metal poisoning and insignificant benefits, etc. Achieve the effect of improving the anti-alkali metal poisoning performance, high catalytic activity and good stability

Pending Publication Date: 2021-07-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is very important to improve the anti-alkali metal poisoning performance of VOCs catalytic combustion catalysts (such as cobalt oxide catalysts).

Method used

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  • Catalyst used for catalytic combustion of VOCs and capable of resisting alkali metal poisoning and preparation method of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 0.8 g of the prepared Co-CAT-1 sample was immersed in 8 mL of tetramethylsiloxane (TMOS) and kept at 60 °C for 12 h. The wetted sample was then washed several times with methanol to remove excess TMOS, and the sample was placed in a quartz tube after washing. with 15 mL / min of N 2 The air flow was bubbled in 0.1 M HCl solution, and the generated humid air flow induced the hydrolysis of TMOS at 50 °C for 30 h. After drying for 5 h, the sample was dried in 150 mL / min of N 2 Carbonization was carried out at 600°C for 4h in air flow environment. The obtained samples were calcined at 500 °C for 2 h in an air atmosphere (heating rate 1 °C / min). Finally, a one-dimensional cowpea-like silica-encapsulated cobalt tetroxide catalyst is obtained.

[0028] Test the catalytic activity and anti-alkali metal poisoning performance of the above catalyst: put 0.3 g of the prepared catalyst into a fixed bed reactor for activity test, the composition of the simulated reaction gas is: 0....

Embodiment 2

[0030] 0.8 g of the prepared Co-CAT-1 sample was immersed in 8 mL of tetramethylsiloxane (TMOS) and kept at 60 °C for 12 h. The wetted sample was then washed several times with methanol to remove excess TMOS, and the sample was placed in a quartz tube after washing. with 15 mL / min of N 2 The air flow was bubbled in deionized water, and the generated humid air flow induced the hydrolysis of TMOS at 60 °C for 30 h. After drying for 5 h, the sample was dried in 150 mL / min of N 2 Carbonization was carried out at 600 °C for 4 h in air flow environment. The obtained samples were calcined at 500 °C for 2 h in an air atmosphere (heating rate 1 °C / min). Finally, a one-dimensional cowpea-like silica-encapsulated cobalt tetroxide catalyst is obtained.

[0031] Test the catalytic activity and anti-alkali metal poisoning performance of the above catalyst: put 0.3 g of the prepared catalyst into a fixed bed reactor for activity test, the composition of the simulated reaction gas is: 0.2...

Embodiment 3

[0033]0.8 g of the prepared Co-CAT-1 sample was immersed in 8 mL of tetramethylsiloxane (TMOS) and kept at 60 °C for 12 h. The wetted sample was then washed several times with methanol to remove excess TMOS, and the sample was placed in a quartz tube after washing. with 15 mL / min of N 2 The air flow was bubbled in 0.05 M HCl solution, and the generated humid air flow induced the hydrolysis of TMOS at 50 °C for 30 h. After drying for 5 h, the sample was dried in 150 mL / min of N 2 Carbonization was carried out at 600°C for 3h in air flow environment. The obtained samples were calcined at 500 °C for 2 h in an air atmosphere (heating rate 1 °C / min). Finally, a one-dimensional cowpea-like silica-encapsulated cobalt tetroxide catalyst is obtained.

[0034] Test the catalytic activity and anti-alkali metal poisoning performance of the above catalyst: put 0.3 g of the prepared catalyst into a fixed bed reactor for activity test, the composition of the simulated reaction gas is: 0....

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Abstract

The invention belongs to the technical field of chemical catalysts, and particularly relates to a catalyst used for catalytic combustion of VOCs and capable of resisting alkali metal poisoning and a preparation method of the catalyst. The catalyst is formed by encapsulating cobalt oxide with catalytic activity in silicon dioxide, wherein a silicon dioxide shell layer provides a confinement effect and a protection function. The method comprises the following steps of: filling the pores of MOF with a siloxane precursor salt by adopting a nanometer casting method of MOF, promoting hydrolysis of the siloxane precursor salt by utilizing an inert gas bubbling method, and carrying out carbonizing and calcining to obtain a one-dimensional cowpea-shaped catalyst. According to the invention, the silicon dioxide shell layer enables the cobalt oxide with high loading capacity to be well dispersed, has small particle size, effectively improves the catalytic activity of the catalyst, prevents the cobalt oxide from being influenced by alkali metal, and improves the alkali metal poisoning resistance of the catalyst. The catalyst is high in activity, good in stability and strong in alkali metal poisoning resistance, and completely meets actual requirements.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, in particular to a VOCs catalytic combustion catalyst resistant to alkali metal poisoning and a preparation method thereof. Background technique [0002] Volatile organic compounds (VOCs) are a major air pollutant. VOCs emitted from vehicle exhaust and industrial production not only cause serious pollution to the environment, but also seriously threaten human health. Over the past few decades, catalytic combustion methods have emerged as one of the most effective and widely used technologies for the removal of various VOCs pollutants. Among VOCs catalytic combustion catalysts, noble metal-based catalysts have strong oxidation properties and exhibit excellent VOCs conversion capabilities. However, its disadvantages such as high price, easy poisoning, and easy sintering limit its large-scale application. Therefore, it is necessary to develop efficient catalysts for the catalytic combu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745F23G7/07
CPCB01J23/745F23G7/07F23G2209/14B01J35/398
Inventor 沈伟查凯文黄镇徐华龙
Owner FUDAN UNIV
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