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A sulfur-resistant catalytic combustion catalyst and its preparation method

A catalytic combustion and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of deactivation, easy sulfation, catalyst activity decline, etc., to enhance surface acidity and promote conversion. , the effect of improving catalytic combustion activity

Active Publication Date: 2017-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ordinary catalytic combustion catalysts generally use alumina as a carrier, and alumina is in SO 2 And under oxygen-enriched conditions, it is easy to be sulfated, resulting in a decrease in catalyst activity or even deactivation

Method used

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  • A sulfur-resistant catalytic combustion catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1)Al 2 o 3 Preparation of the sol: 25 grams of pseudo-boehmite was added to 200 mL of deionized water, and 10 g of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 4~5, and age for 24 hours to obtain a transparent aluminum sol.

[0023] (2)Al 2 o 3 Coating preparation: immerse the cordierite honeycomb ceramic substrate in the aluminum sol prepared in step (1), take it out, blow off the residual liquid, dry at 120°C for 6 hours, and bake at 500°C for 5 hours to obtain the coated Al 2 o 3 Coated carrier.

[0024] (3) TiO 2 -CeO 2 Preparation of composite sol: Add 76.5 grams of butyl titanate and 5 grams of cerium nitrate into 70 mL of absolute ethanol, and after stirring evenly, slowly add the above solution into 100 mL of vigorously stirred nitric acid solution with a concentration of 0.5 mol / L, and stir...

Embodiment 2

[0030] (1)Al 2 o 3 Preparation of the sol: 25 grams of pseudo-boehmite was added to 160 mL of deionized water, and 8 g of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 50°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 4~5, and age for 36 hours to obtain a transparent aluminum sol.

[0031] (2)Al 2 o 3 Coating preparation: immerse the cordierite honeycomb ceramic substrate in the aluminum sol prepared in step (1), take it out, blow off the residual liquid, dry at 150°C for 5 hours, and bake at 400°C for 5 hours to obtain Al coated 2 o 3 Coated carrier.

[0032] (3) TiO 2 -CeO 2 Preparation of composite sol: Add 51 grams of butyl titanate and 30 grams of cerium nitrate to 40 mL of absolute ethanol, stir well, slowly add the above solution into 120 mL of vigorously stirred nitric acid solution with a concentration of 1 mol / L, and stir for 2 hours , aged at ro...

Embodiment 3

[0038] (1)Al 2 o 3 Preparation of the sol: 25 grams of pseudoboehmite was added to 125 mL of deionized water, and 6 g of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 90°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 3~4, and age for 12 hours to obtain a transparent aluminum sol.

[0039] (2)Al 2 o 3 Coating preparation: immerse the cordierite honeycomb ceramic substrate in the aluminum sol prepared in step (1), take it out, blow off the residual liquid, dry at 100°C for 12 hours, and bake at 600°C for 3 hours to obtain Al coated 2 o 3 Coated carrier.

[0040] (3) TiO 2 -CeO 2 Preparation of composite sol: Add 51 grams of butyl titanate and 30 grams of cerium nitrate to 40 mL of absolute ethanol, and after stirring evenly, slowly add the above solution into 100 mL of vigorously stirred nitric acid solution with a concentration of 0.5 mol / L, and stir for 2 ...

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Abstract

The invention discloses a sulfur-resistant catalytic combustion catalyst and a preparation method thereof. Using honeycomb ceramics as a substrate, first impregnating aluminum sol to coat Al2O3 coating, then impregnating TiO2-CeO2 composite sol to coat TiO2-CeO2 coating, and loading two layers The coated carrier is treated with a sulfuric acid solution, and finally the active components Pt, Pd, Fe2O3 and Ag are impregnated. Based on the quality of the honeycomb ceramic substrate, the proportion of the Al2O3 coating is 1wt%~10wt%; the proportion of the TiO2-CeO2 coating is 1wt%~10wt%, and the mass ratio of TiO2 to CeO2 is 10:1~1 : 1; the SO ratio is 1wt%~5wt%; the ratio of the active component Pt is 0.01wt%~0.1wt%, and the ratio of Pd is 0.01wt%~0.1wt%. The proportion is 1wt%~5wt%, and the proportion of Ag is 0.1wt~1wt%. The preparation process of the method of the invention is simple, and the prepared catalyst has good catalytic combustion activity and stability for sulfur-containing organic waste gas.

Description

technical field [0001] The invention relates to a catalytic combustion catalyst and a preparation method thereof, in particular to a sulfur-resistant catalytic combustion catalyst and a preparation method thereof. Background technique [0002] Sulfur-containing volatile organic compounds widely exist in the petroleum processing industry and downstream fine chemical industry, such as hydrogen sulfide and methyl mercaptan, ethanethiol, methyl sulfide, ethyl sulfide, carbon disulfide, dimethyl Sulfur-containing gases such as disulfide; CH 3 SH, CH 3 CH 2 SH, CS 2 and other sulfur pollutants. These foul-smelling gases seriously irritate people's sense of smell, cause unpleasantness or disgust, and have serious harm to human health. [0003] At present, there are many methods for dealing with common volatile organic compounds (VOCs), such as condensation, adsorption, absorption, direct combustion, catalytic combustion, etc. The choice of a suitable method depends on the nat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/055B01D53/86B01D53/52B01D53/48B01D53/72
Inventor 王学海陈高升王宽岭刘忠生陈玉香
Owner CHINA PETROLEUM & CHEM CORP