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High-dispersion Pd-Ag supported acetylene hydrogenation catalyst and preparation method thereof

An acetylene hydrogenation catalyst and a technology for acetylene hydrogenation, which are used in catalyst activation/preparation, carbon compound catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor dispersion of active metals, influence on catalyst activity, and unfavorable scale. production and other problems, to achieve the effect of high dispersion, low cost, excellent selectivity and anti-coking performance

Inactive Publication Date: 2020-02-28
天津金玺科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using mercaptan as a ligand, the active metal Pd is prone to sulfur poisoning, which affects the activity of the catalyst
[0009] The above existing technologies generally have disadvantages such as poor dispersion of active metals in the catalyst, complicated preparation methods, high cost, and unfavorable large-scale production.

Method used

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  • High-dispersion Pd-Ag supported acetylene hydrogenation catalyst and preparation method thereof
  • High-dispersion Pd-Ag supported acetylene hydrogenation catalyst and preparation method thereof
  • High-dispersion Pd-Ag supported acetylene hydrogenation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Commercially available alumina balls with a diameter of 4mm were fired at 1300°C for 4h to obtain α-Al 2 o 3 Carrier, measure carrier bulk ratio, pore size, specific surface area, water absorption.

[0044] Weigh 100 g of the carrier for catalyst preparation, and weigh a certain amount of water according to the water absorption rate of the carrier. Using silver nitrate as a precursor, silver nitrate was weighed according to the loading capacity of 0.10% Ag, completely dissolved in the weighed water, and the pH value of the solution was adjusted to 2.0. The solution was slowly impregnated onto the weighed carrier, and aged at room temperature for 30 min. Then it was dried at 120°C for 240 minutes, and then calcined at 500°C for 240 minutes to obtain an impregnated catalyst.

[0045] Prepare 100mL of PMA aqueous solution with a concentration of 1mmol / L, adjust the pH of the solution to 1.8 with dilute nitric acid, place the prepared one-impregnated catalyst in the solu...

Embodiment 2

[0054] Use commercially available high-purity alumina balls with a particle size of Cylinder, calcined at 1250°C for 4h to obtain α-Al 2 o 3 Carrier, measure the carrier bulk ratio, pore size, specific surface, water absorption.

[0055] Weigh 100 g of the carrier for catalyst preparation, and weigh a certain amount of water according to the water absorption rate. Using silver nitrate as a precursor, silver nitrate was weighed according to the loading capacity of 0.04% Ag, completely dissolved in the weighed water, and the pH value of the solution was adjusted to 2.2. The solution was slowly impregnated onto the weighed carrier, and aged at room temperature for 30 min. Then it was dried at 120°C for 240 minutes, and then calcined at 500°C for 240 minutes to obtain an impregnated catalyst.

[0056] Prepare 100mL of PMA aqueous solution with a concentration of 3mmol / L, adjust the pH of the solution to 4.2 with ammonia water, place the prepared one-immersion catalyst in the ...

Embodiment 3

[0066] Use commercially available high-purity alumina balls with a size of Hollow cylindrical support, calcined at 1200°C for 4h to obtain α-Al 2 o 3 Carrier, measure the carrier bulk ratio, pore size, specific surface, water absorption.

[0067] Weigh 100 g of the carrier for catalyst preparation, and weigh a certain amount of water according to the water absorption rate. Using silver nitrate as a precursor, silver nitrate was weighed according to the loading capacity of 0.13% Ag, completely dissolved in the weighed water, and the pH value of the solution was adjusted to 2.8. The solution was slowly impregnated onto the weighed carrier, and aged at room temperature for 40 min. Then it was dried at 100°C for 240 minutes, and then calcined at 500°C for 240 minutes to obtain an impregnated catalyst.

[0068] Prepare 100mL of PMA water+ethanol (water:ethanol=2:1) ​​solution with a concentration of 8.6mmol / L, adjust the pH of the solution to 8.0 with ammonia water, place the ...

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Abstract

The invention discloses a high-dispersion Pd-Ag alloy catalyst, and belongs to the field of chemical catalysts. Active components of the catalyst are Pd and Ag as auxiliary components, a carrier is Al2O3 or a composite oxide carrier containing the Al2O3, and the catalyst is characterized in that the content of the Pd in the catalyst is 0.01-0.1% by mass, wherein the content of the Ag is 0.03-1.0%,the catalyst is an alloy type bimetallic catalyst, and in the preparation process, a carboxyl-containing compound is adopted to be matched with the Pd for site-specific loading, so that Pd, high dispersion and Pd-Ag alloy formation are facilitated. The method solves the problems of large active metal particle size, non-uniform dispersion, low catalyst active metal utilization rate, unsatisfactoryactivity and selectivity, easy coking of the catalyst and fast deactivation rate caused by the preparation of the catalyst by an impregnation method in the industry at present. The catalyst providedby the invention can be used in the selective hydrogenation process of C2 fraction.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and relates to a highly dispersed Pd-Ag supported acetylene hydrogenation catalyst and a preparation method thereof, and is especially suitable for the selective hydrogenation conversion of trace amounts of acetylene in ethylene streams into ethylene. Background technique [0002] Ethylene is the main indicator of a country’s chemical development level. The ethylene stream produced by steam cracking and ethane cracking usually contains 0.5% to 2.5% of acetylene, which needs to be converted into ethylene by selective hydrogenation before it can be used for subsequent polymerization. process. The presence of acetylene will increase the side reactions of ethylene polymerization and affect the quality of the polymer. In addition, acetylene is easy to react with the polymerization copper-based catalyst to form copper acetylene explosive compounds. Therefore, the content of acetylene in pol...

Claims

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Application Information

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IPC IPC(8): B01J23/50C07C5/09C07C11/04
CPCB01J23/50B01J37/0018C07C5/09C07C2523/50C07C11/04Y02P20/52
Inventor 蔡建华
Owner 天津金玺科技发展有限公司
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