Supported honeycomb catalyst, and preparation method and application thereof

A honeycomb catalyst and supported technology, which is applied in the direction of catalyst activation/preparation, catalyst carrier, chemical instruments and methods, etc., can solve the problems of difficult to meet acrylonitrile and high reaction temperature, and achieve simple preparation process, low energy consumption and high catalytic performance The effect of activity and selectivity

Inactive Publication Date: 2020-05-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction temperature required for the purification of acrylonitrile tail gas is as high as 650°C, and the catalyst disclosed in patent 1462652A is difficult to meet the requirements of the working condition of acrylonitrile tail gas purification.

Method used

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  • Supported honeycomb catalyst, and preparation method and application thereof
  • Supported honeycomb catalyst, and preparation method and application thereof
  • Supported honeycomb catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Mesoporous γ-Al with narrow pore distribution is first prepared by hydrothermal synthesis (conventional hydrothermal synthesis belongs to the prior art) 2 o 3 , Weigh 9.6648g Cu(NO) 3 ·3H2 O (chemically pure reagent), 1.6987g AgNO 3 (chemically pure reagent) was dissolved in 98g of water to make an impregnation solution, in which the molar ratio of Cu to Ag was 4:1, and then weighed γ-Al 2 o 3 6.2g was placed in the impregnating solution, stirred thoroughly, dried at 120°C for 12 hours, and calcined at 600°C for 4 hours to obtain M / γ-Al 2 o 3 active ingredient. Put it, 3.0g of pseudo-boehmite and 1.0g of alumina sol into a ball mill jar, 30g of water, and ball mill for 3 hours at a speed of 500r / min to obtain a slurry. Put 1mL cordierite carrier into the slurry and soak for 3min, take it out and drain, dry overnight at 200°C, calcinate at 650°C for 4h to prepare the catalyst, and cool to obtain the required monolithic structure honeycomb ceramic catalyst.

[009...

Embodiment 2～ Embodiment 6

[0100] The catalyst Cu that adopts and Ag load capacity are different, from embodiment 2 to embodiment 6 the mol ratio of Cu and Ag is respectively 4:2, 4:3, 4:4, 5:2 and 3:3, other conditions and Embodiment 1 is all the same. Embodiment 2~Example 6 Catalyst evaluation operation is the same as embodiment 1, and evaluation result is as follows figure 1 shown.

Embodiment 7

[0102] First synthesize mesoporous γ-Al with narrow pore distribution by sol-gel method (prepared according to the method in patent CN104399470A) 2 o 3 , 9.6648g Cu(NO 3 ) 3 ·3H 2 O (chemically pure reagent), 1.6987g AgNO 3 (Chemical pure reagent) 4.3412gCe(NO 3 ) 3 ·6H 2 O (chemically pure reagent), 6.2g γ-Al 2 o 3 , 3.0g pseudo-boehmite, 1.0g alumina sol and 30g water were put into a ball mill together, wherein the mass percentages of Cu, Ag and Ce were 4:2:1, and the remaining catalyst preparation conditions and catalyst evaluation conditions were the same as in Example 1. Evaluation results such as figure 2 as shown, figure 2 shows that after adding 1% cerium in the catalyst coating mass percentage, N 2 The selectivity of cerium has a greater improvement at lower temperature (300 °C), indicating that cerium can lower the temperature at which acrylonitrile is completely converted.

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Abstract

The invention discloses a supported honeycomb catalyst, a preparation method thereof, and an application of the supported honeycomb catalyst in treatment of acrylonitrile-containing waste gas. The catalyst comprises a catalytic coating and a honeycomb carrier; the catalytic coating comprises an active component and a mesoporous metal oxide carrier; and the active component comprises an active metal element, and the active metal element is selected from at least one of Cu, Ag and Ce. The catalyst has very high catalytic activity and selectivity, and the catalyst is simple in preparation process, low in raw material price, basically free of byproducts, low in energy consumption and wide in industrial application value.

Description

technical field [0001] The application relates to an acrylonitrile waste gas purification catalyst with high selectivity and high hydrothermal stability and a preparation method thereof, belonging to the field of acrylonitrile waste gas purification. Background technique [0002] As an important chemical intermediate, acrylonitrile is an intermediate monomer of synthetic fiber, synthetic rubber and synthetic resin, and has extremely wide uses. [0003] At present, acrylonitrile is mainly produced by ammoxidation of propylene. The exhaust gas discharged from the top of the absorption tower in the propylene ammoxidation process is called Absorbed Off Gas (AOG, Absorbed Off Gas). Carbon dioxide, nitrogen oxides and cyanide-containing substances (acrylonitrile, hydrocyanic acid, acetonitrile), etc. According to my country's latest "Petrochemical Industry Pollutant Discharge Standard (GB 31571-2015)", the content of acrylonitrile in the exhaust gas is less than 0.5mg / m 3 , hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/04B01J37/02B01J21/04B01J35/10B01J32/00B01D53/86B01D53/54
CPCB01D53/8621B01J21/04B01J23/894B01J35/04B01J35/1061B01J37/0018B01J37/0201B01J37/0215
Inventor 王胜徐德康王树东汪明哲林乐
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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