A kind of preparation method and application of catalyst carrier

A catalyst carrier, catalyst technology, applied in the direction of catalyst carrier, chemical instruments and methods, physical/chemical process catalyst, etc., can solve the problems of affecting catalyst activity, poor dispersion of hydroxyl groups, easy to aggregate together, etc., to ensure catalytic activity. , The distribution of hydroxyl groups is uniform, and the effect of improving mechanical strength

Active Publication Date: 2022-04-05
THE NORTHWEST RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of hydroxyl groups, the silica is easy to gather together when it is formed, and the dispersion is not good, resulting in the loss of hydroxyl groups, which affects the catalyst activity.
Some researchers found that during the transition of the catalyst from powder to molded body, the activity loss of the catalyst is about 10%.

Method used

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  • A kind of preparation method and application of catalyst carrier
  • A kind of preparation method and application of catalyst carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the present embodiment catalyst carrier comprises the following steps:

[0034] Step 1. Add 990g of white carbon black and 10g of silicon carbide into the wheel mill and mix well, then dilute 50g of water glass with a modulus of 3.3 with 1900g of water, add them to the wheel mill in batches and mix for 60min, take out The mixture was obtained after standing for 60 minutes, and then the mixture was placed in a twin-screw extruder for extruding to obtain a cylindrical shaped body with a diameter of 3.5 mm; the white carbon black was prepared by a precipitation method;

[0035] Step 2. Dry the molded body obtained in Step 1 at 150°C for 4 hours, then place it in a muffle furnace, and heat it up to 400°C for 120 minutes in an air atmosphere at a rate of 5°C / min to obtain a catalyst carrier.

[0036] The binder in this embodiment can also be water, clay, kaolin, paraffin, gum, starch paste, silica sol, aluminum sol, nitric acid solution or phosphori...

Embodiment 2

[0042] The preparation method of the present embodiment catalyst carrier comprises the following steps:

[0043] Step 1. Add 950g of white carbon black and 50g of silicon carbide into the wheel mill and mix well, dissolve 10g of dodecyl dimethyl hydroxypropyl sulfobetaine (HSB-12) in 500g of water and batch Add it into the wheel mill and mix evenly, then dilute 100g of silica sol with a mass concentration of 25% with 1400g of water, add it to the wheel mill in batches and mix for 40min, take it out and let it stand for 60min to get the mixture, then put the mixture in double Carry out extrusion molding in the screw extruder, obtain the cylindrical shaped body that diameter is 3.5mm; Described white carbon black is prepared by precipitation method;

[0044] Step 2. Dry the molded body obtained in step 1 at 130°C for 5 hours, then place it in a muffle furnace, and heat it up to 600°C for 10 minutes in an air atmosphere at a rate of 5°C / min to obtain a catalyst carrier.

[0045]...

Embodiment 3

[0048] The preparation method of the present embodiment catalyst carrier comprises the following steps:

[0049] Step 1. Add 970g of white carbon black and 30g of silicon carbide to the wheel mill and mix well. Dissolve 20g of Tween 80 in 500g of water and add them to the wheel mill in batches to mix evenly. After the water glass is diluted with 1390g of water, it is added to the wheel mill in batches and mixed for 10 minutes. After taking it out and standing for 60 minutes, the mixture is obtained, and then the mixture is placed in a twin-screw extruder for extrusion molding to obtain a cylinder with a diameter of 3.5mm. Forming a body; the white carbon black is prepared by a precipitation method;

[0050] Step 2. Dry the molded body obtained in step 1 at 200°C for 6 hours, then place it in a muffle furnace, and heat it up to 500°C for 300 minutes in an air atmosphere at a rate of 5°C / min to obtain a catalyst carrier.

[0051] The binder in this embodiment can also be water,...

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Abstract

The invention discloses a method for preparing a catalyst carrier. In the method, white carbon black, a binder, a surfactant and / or silicon carbide are uniformly mixed, extruded, and then dried and calcined to obtain a catalyst carrier; the invention Also disclosed is an application of a catalyst carrier, wherein the catalyst precursor is loaded onto the catalyst carrier by an impregnation method to prepare a catalyst for dehydration of N-hydroxyethylpyrrolidone to synthesize N-vinylpyrrolidone. The present invention introduces surfactant and / or silicon carbide into the preparation raw material of the catalyst carrier, which promotes the uniform dispersion of white carbon black, avoids the agglomeration of hydroxyl groups, reduces the activity loss of the catalyst, and improves the mechanical strength of the carrier at the same time; The catalyst carrier is applied to the preparation of N-hydroxyethylpyrrolidone dehydration synthesis N-vinylpyrrolidone catalyst, which increases the number of active centers of the catalyst and reduces the activity decline of the catalyst after molding.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method and application of a catalyst carrier. Background technique [0002] Generally, the use and storage of industrial catalysts require shaped catalysts. Through processing and shaping, the catalysts can obtain suitable shapes, sizes and mechanical strengths, which are suitable for catalytic reactions and catalytic devices. At the same time, they are easy to store and promote the large-scale industrial development and application of catalysts. . However, the activity of the catalyst after molding tends to decrease, so the research on the molding method is very important. In practice, the catalyst is often supported on a suitable catalyst carrier and then shaped. As a catalyst carrier, it must have a suitable surface area, pore size, shape and porosity to load the required amount of catalyst active components. It needs to have a certain str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J27/224B01J27/228B01J35/02C07D207/267
CPCB01J32/00B01J27/224B01J27/228B01J35/02B01J35/0066C07D207/267
Inventor 潘喜强王瑞曾清湖吴西宁高亚娜李玉洁
Owner THE NORTHWEST RES INST OF CHEM IND
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