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High-dispersion, high-activity and high-stability mercury-free noble metal catalyst and preparation method thereof

A precious metal catalyst, high stability technology, used in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, hydrogen halide addition preparation and other directions, can solve problems such as insufficient acetylene conversion rate, and achieve high stability Sex, high activity, the effect of maintaining activity

Pending Publication Date: 2022-05-06
SHANDONG DONGYUE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN104289246B reported a nitrogen-doped activated carbon catalyst, but in the absence of metals, the conversion of acetylene still has insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) soak the coconut shell carbon carrier with a hydrochloric acid solution with a concentration of 2mol / L, soak at 100°C for 6 hours, then wash with deionized water until the pH value reaches above 4, and then dry at 100°C for 6 hours, A pretreated activated carbon carrier is obtained.

[0028] (2) Aqueous chloroauric acid solution, aqueous copper chloride solution, and trichloroisocyanuric acid are uniformly mixed and impregnated onto the activated carbon carrier in equal volumes by means of vacuum-assisted ultrasonic impregnation. The mass fractions of active components, additives, and ligands are 0.05%, 0.5%, and 1%, respectively. During vacuum-assisted ultrasonic impregnation, the vacuum degree is below -0.09MPa, the ultrasonic frequency is 40KHZ, and the time is 40 minutes.

[0029] (3) Transfer the above solid to a freeze dryer, vacuumize the drying process, the vacuum degree is below 20Pa, the pre-cooling temperature is -35°C, the pre-cooling time is 3 hours, t...

Embodiment 2

[0032] (1) soak the coconut shell carbon carrier with a hydrochloric acid solution with a concentration of 2mol / L, soak at 100°C for 6 hours, then wash with deionized water until the pH value reaches above 4, and then dry at 100°C for 6 hours, A pretreated activated carbon carrier is obtained.

[0033] (2) Mix the chloroauric acid aqueous solution, the cupric chloride aqueous solution, and the melamine uniformly and impregnate them on the activated carbon carrier in equal volumes by means of vacuum-assisted ultrasonic impregnation. Wherein the mass fractions of active components, auxiliary agents and ligands are 0.05%, 0.5% and 1% respectively. During vacuum-assisted ultrasonic impregnation, the vacuum degree is below -0.09MPa, the ultrasonic frequency is 30KHZ, and the time is 60 minutes.

[0034] (3) Transfer the above solid to a freeze dryer, vacuumize the drying process, the vacuum degree is below 20Pa, the pre-cooling temperature is -20°C, the pre-cooling time is 6 hours...

Embodiment 3

[0037] (1) soak the coconut shell carbon carrier with a hydrochloric acid solution with a concentration of 2mol / L, soak at 100°C for 6 hours, then wash with deionized water until the pH value reaches above 4, and then dry at 100°C for 6 hours, A pretreated activated carbon carrier is obtained.

[0038] (2) The chloroauric acid aqueous solution, copper chloride aqueous solution, and Na2S2O3 are mixed uniformly and impregnated on the activated carbon carrier by vacuum-assisted ultrasonic impregnation. Wherein the mass ratio of active component: auxiliary agent: ligand is 0.05%, 0.5% and 1% respectively for the mass fractions of the active component, auxiliary agent and ligand. During vacuum-assisted ultrasonic impregnation, the vacuum degree is below -0.09MPa, the ultrasonic frequency is 50KHZ, and the time is 20 minutes.

[0039] (3) Transfer the above solid to a freeze dryer, vacuumize the drying process, the vacuum degree is below 20Pa, the pre-cooling temperature is -30°C, ...

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PUM

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a high-dispersion, high-activity and high-stability mercury-free noble metal catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) pre-treating an activated carbon carrier by adopting a hydrochloric acid solution, and then washing and drying to obtain a pre-treated activated carbon carrier; (2) impregnating the pretreated activated carbon carrier with the dissolved active component precursor aqueous solution, the auxiliary agent precursor aqueous solution and the ligand through a vacuum-assisted ultrasonic impregnation method; and (3) carrying out vacuum freeze drying on the impregnated activated carbon carrier to obtain the mercury-free noble metal catalyst. High dispersion and high stability of the noble metal catalyst are realized, the production cost of the noble metal catalyst is reduced, and the service life of the noble metal catalyst is prolonged.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a mercury-free noble metal catalyst with high dispersion, high activity and high stability and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is a widely used synthetic resin material with low cost, good mechanical properties, excellent flame retardancy, good electrical insulation and high acid and alkali resistance. The monomer for PVC polymerization is vinyl chloride (VCM). At present, the industrial processes for producing vinyl chloride monomer mainly include the acetylene method based on coal resources, the ethylene method and the ethane method based on petroleum resources. China is a country rich in coal but poor in oil. Therefore, in these processes, the acetylene method (also known as calcium carbide method) relies on coal resources and has a strong cost advantage, combining China's resources, technologies and strategies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J27/02B01J31/22B01J31/16C07C17/08C07C21/06
CPCB01J23/8926B01J23/8913B01J31/1815B01J31/16B01J27/02C07C17/08B01J2231/32B01J2531/16B01J2531/18B01J2531/845C07C21/06
Inventor 李汉生丁晨牛韦田丁磊王伟张岩左春雨都容礼王鑫
Owner SHANDONG DONGYUE CHEM
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