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Preparation and application of Silicalite-1 and silicon oxide coated ZSM-5 catalyst

A ZSM-5 and catalyst technology, which is applied in the preparation and application of catalysts, can solve problems such as multiple side reactions and acid site dispersion, and achieve the effect of increasing yield and facilitating diffusion

Pending Publication Date: 2021-12-07
深圳科冠华太新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide the preparation and application of Silicalite-1 and silica-coated ZSM-5 catalysts, so as to solve the problems of acid site dispersion and more side reactions occurring in the above-mentioned background technology

Method used

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  • Preparation and application of Silicalite-1 and silicon oxide coated ZSM-5 catalyst
  • Preparation and application of Silicalite-1 and silicon oxide coated ZSM-5 catalyst
  • Preparation and application of Silicalite-1 and silicon oxide coated ZSM-5 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation of Silicalite-1 and silicon oxide-coated ZSM-5 catalysts includes step 1, material selection; step 2, impregnation; step 3, suction filtration; step 4, sealed crystallization; step 5, roasting and post-treatment;

[0026] In the above-mentioned step 1, respectively select ZSM-5 molecular sieves weighed at 140°C, SB powder weighed at 140°C, and safflower powder at a mass ratio of 100:25:3, fully kneaded with 10wt% nitric acid solution and extruded The strips are formed, and the strips are dried in an oven at 120°C overnight, and then baked in a muffle furnace. The roasting procedure is to heat up to 300°C for 3 hours at room temperature and maintain for 1 hour; then heat up to 550°C for 3 hours and maintain for 5 hours. Cool down to below 200°C and take out;

[0027] Wherein in the above step 2, the forming agent is placed in the mixed solution of TEOS and n-pentane, the mass ratio of TEOS and n-pentane is 3:7, and it is left standing at room temperature ...

Embodiment 2

[0032] The preparation of Silicalite-1 and silicon oxide-coated ZSM-5 catalysts includes step 1, material selection; step 2, impregnation; step 3, suction filtration; step 4, sealed crystallization; step 5, roasting and post-treatment;

[0033] Wherein in the above-mentioned step one, select the forming agent prepared in the same batch as that of Example 1;

[0034] Wherein in the above step 2, the forming agent is placed in the water glass solution, the water glass modulus is 3.0, and the solid content is 30.2%, and it is allowed to stand at room temperature for 6 hours;

[0035] Wherein in the above-mentioned step 3, the impregnated catalyst in the step 2 is taken out, then placed in the suction filtration funnel, and suction filtered for 2 hours, and the excess components on the catalyst are extracted;

[0036] In the above step 4, take 20g of the above-mentioned forming agent and place it in the upper layer of the hydrothermal kettle, take 5g of water and 8g of n-butylamin...

Embodiment 3

[0039] The preparation of Silicalite-1 and silicon oxide-coated ZSM-5 catalysts includes step 1, material selection; step 2, impregnation; step 3, suction filtration; step 4, sealed crystallization; step 5, roasting and post-treatment;

[0040] Wherein in the above-mentioned step one, select the forming agent prepared in the same batch as that of Example 1;

[0041] Wherein in the above step 2, the forming agent is placed in a mixed solution of TEOS, 30wt% TPAOH, ethanol, and water, the ratio of which is 10:2:15:15; stand at room temperature for 6 hours;

[0042] Wherein in the above-mentioned step 3, the impregnated catalyst in the step 2 is taken out, then placed in the suction filtration funnel, and suction filtered for 2 hours, and the excess components on the catalyst are extracted;

[0043] Among them, in the above step 4, take 20g of the above-mentioned forming agent and place it in the upper layer of the hydrothermal kettle, and take 8g of water and place it in the low...

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Abstract

The invention discloses preparation and application of a Silicalite-1 and silicon oxide coated ZSM-5 catalyst. The preparation method comprises the steps of 1, selecting materials; 2, dipping; 3, conducting suction filtration; 4, sealing and crystallizing; and 5, carrying out roasting and post-processing. In the step 1, a ZSM-5 catalyst formed by a conventional method is selected; in the step 2, the catalyst selected in the step 1 is fully impregnated in a silicon source and necessary components; and in the step 3, the impregnated catalyst in the step 2 is taken out, and redundant components on the catalyst are extracted. According to the invention, acid sites on the outer surface of the catalyst are coated in the form of Silicalite-1 and silicon oxide, on the one hand, side reactions on the outer surface of the catalyst are limited, on the other hand, diffusion of molecular sieve orifices is limited, and diffusion of small molecular products is facilitated; and in the actual n-butene cracking reaction, the catalytic life of the coated catalyst and the yields of ethylene and propylene are improved.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation and application thereof, in particular to the preparation and application of Silicalite-1 and silica-coated ZSM-5 catalysts. Background technique [0002] Ethylene and propylene are the most basic chemical raw materials, and their production mainly comes from catalytic cracking and steam cracking. In addition, based on China's energy structure of lean oil and more coal, the methanol-to-olefins technology that has flourished in the past 20 to 30 years has also become the main source of ethylene and propylene. An important source, in addition to the production of ethylene and propylene, the methanol-to-olefins technology will also produce a large amount of mixed C4 and C5 olefins. From the perspective of long-term economy and stability, the mixed C4 and C5 olefins are cracked to produce high value-added Ethylene and propylene are the optimal routes; representatives of low-carbon olefin ...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C4/06C07C11/04C07C11/06
CPCB01J29/40C07C4/06C07C11/04C07C11/06Y02P20/52
Inventor 尹琪任雅梅
Owner 深圳科冠华太新材料技术有限公司
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