Catalyst for low-temperature catalytic combustion of volatile aromatic hydrocarbon organic matters and method for preparing catalyst

A low-temperature catalysis and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, combustion methods, etc., can solve the problems of unfavorable industrial production and high requirements for ultrasonic pretreatment, and achieves low cost, low cost, and high requirements for ultrasonic pretreatment. The effect of easy availability of raw materials

Inactive Publication Date: 2016-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultrasonic pretreatment requires high requirements, which is not conducive to industrial production

Method used

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  • Catalyst for low-temperature catalytic combustion of volatile aromatic hydrocarbon organic matters and method for preparing catalyst
  • Catalyst for low-temperature catalytic combustion of volatile aromatic hydrocarbon organic matters and method for preparing catalyst
  • Catalyst for low-temperature catalytic combustion of volatile aromatic hydrocarbon organic matters and method for preparing catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pretreatment of cordierite honeycomb ceramics: completely immerse cordierite honeycomb ceramics in 1wt% nitric acid solution for 1 hour, rinse with deionized water 3 times after taking out, blow off residual liquid, and dry at 90°C for 1 hour. Calcined at 400° C. for 2 hours to obtain a surface-activated cordierite honeycomb ceramic carrier.

[0034] Preparation of aluminum sol: Add 10 grams of aluminum isopropoxide into 90 ml of deionized water, heat to 85° C. for stirring and hydrolysis. After complete hydrolysis, it becomes turbid. Slowly add a certain amount of dilute nitric acid of about 4ml5mol / L to degumming. The calculated content is 10wt%.

[0035] Coating of aluminum coating: After immersing the treated cordierite honeycomb carrier in aluminum sol for 1 hour, filter out the solution in the pores, dry at 120°C for 1 hour, and bake at 700°C for 2 hours to obtain alumina-coated cordierite Cellular carrier. The alumina loading reached 8% after coating.

[0036...

Embodiment 2

[0040] Pretreatment of cordierite honeycomb ceramics: completely immerse cordierite honeycomb ceramics in 1wt% sulfuric acid solution for 1 hour, rinse with deionized water 3 times after taking out, blow off the residual liquid, and dry at 120°C for 5 hours. Calcined at 700° C. for 6 hours to obtain a surface-activated cordierite honeycomb ceramic carrier.

[0041]Preparation of aluminum sol: add 26 grams of pseudoboehmite powder into 120ml of deionized water, heat to 85°C under stirring, slowly add a certain amount of dilute nitric acid of about 6ml5mol / L dropwise, control the pH value of the solution at 2~4, after stirring Standing and aging for 24 hours, a transparent aluminum sol with certain fluidity was obtained, and the content was 10wt% based on alumina.

[0042] Coating of aluminum coating: After immersing the treated cordierite honeycomb carrier in aluminum sol for 3 hours, filter out the solution in the pores, dry at 90°C for 5 hours, and bake at 400°C for 6 hours t...

Embodiment 3

[0047] Pretreatment of cordierite honeycomb ceramics: completely immerse cordierite honeycomb ceramics in 1wt% hydrochloric acid solution for 1 hour, rinse with deionized water 3 times after taking out, blow off residual liquid, and dry at 110°C for 3 hours. Calcined at 550° C. for 3 hours to obtain a surface-activated cordierite honeycomb ceramic carrier.

[0048] Aluminum sol preparation: 40 grams of AlCl 3 ·6H 2 Dissolve in 100ml of deionized water with stirring, let it stand for 30 minutes after completely dissolving and cooling, then dissolve 10 grams of 200-mesh aluminum powder in AlCl with stirring 3 In the solution, heat to 80-90°C at the same time to completely dissolve the aluminum powder into a sol, control the pH value of the solution at 2-4, and stand and age for 24 hours to obtain an aluminum sol, the content of which is 10wt% based on alumina.

[0049] Coating of aluminum coating: After immersing the treated cordierite honeycomb carrier in aluminum sol for 1 h...

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Abstract

The invention relates to a chemical catalyst preparation technology, and aims to provide a catalyst for low-temperature catalytic combustion of volatile aromatic hydrocarbons and a preparation method thereof. The catalyst is based on cordierite honeycomb ceramics, and the surface of the base body is sequentially provided with an aluminum coating, an additive coating and an active component layer from the inside to the outside; based on the total amount of the catalyst, the catalyst contains 85-90 wt% of the cordierite honeycomb ceramics, 8-12 wt% of the aluminum coating, 1-5 wt% of the auxiliary coating, and 0.05-0.5 wt% of the active component layer; wherein, the composition of the aluminum coating is alumina; the composition of the auxiliary coating is a rare earth metal oxide; The constituents of the active component layer are noble metals. The preparation process of the invention is simple, the preparation raw materials are easy to obtain, the specific surface area is large, the cost is low, and the catalytic combustion reaction of benzene series such as toluene has high catalytic activity; the active component has strong binding force with the matrix, and is not easy to fall off and crack It can still maintain high activity under high space velocity airflow and thermal shock.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for the catalytic combustion of aromatic volatile organic compounds, and belongs to the technical field of chemical catalysts and their preparation. Background technique [0002] Aromatic volatile organic compounds (AVOCs) are important chemical raw materials, especially toluene and xylene, which are commonly used in the paint industry, ink manufacturing industry, chemical synthesis, and manufacturing extraction and degreasing processes. Solvents, thinners, etc. , as well as industrial fields such as explosives and medicine, have high toxicity and carcinogenic, teratogenic, and mutagenic hazards to organisms. With the continuous development of industrialization in modern society, a large number of aromatic volatile organic compounds are produced in the process of industrial waste gas emission and waste incineration, which not only cause serious harm to human health, but also have a cumulative i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/46B01J23/42F23G7/07
CPCB01J23/63B01J23/42B01J23/462B01J37/0234F23G7/07F23G2209/14
Inventor 赵伟荣焦向东陈金胜
Owner ZHEJIANG UNIV
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