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Preparation method of C2 selective hydrogenation catalyst

A technology for selective hydrogenation and catalysts, applied in catalyst activation/preparation, hydrocarbons, chemical instruments and methods, etc., can solve the problem of unsatisfactory catalyst activity and selectivity, active component Pd and co-active component content High, catalyst activity and selectivity decline and other problems, to achieve the effect of improving activity and selectivity, enhancing dispersibility and utilization, and narrow particle size

Inactive Publication Date: 2014-03-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patent CN 1764617A discloses a catalyst for selective hydrogenation of acetylene and its production method. The catalyst includes the main active component Pd and the auxiliary active components La, Ti, Nb, K or Si. The preparation process of the method is complicated, and The content of active component Pd and co-active components is high, and the activity and selectivity of the catalyst are still unsatisfactory
[0006] The existing preparation method of carbon 2 selective hydrogenation catalyst is easy to make the precious metal palladium penetrate into the interior of the carrier, resulting in the aggregation of the palladium active center inside the carrier so that it cannot effectively participate in the reaction
Therefore, the deficiency of existing carbon two selective hydrogenation catalyst preparation method is that the utilization efficiency of precious metal palladium is low, thereby catalyst activity and selectivity are reduced to some extent

Method used

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  • Preparation method of C2 selective hydrogenation catalyst
  • Preparation method of C2 selective hydrogenation catalyst
  • Preparation method of C2 selective hydrogenation catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] ①Pipe 50mgPd / ml of Pd(NO 3 ) 2 2ml solution, diluted to 100g with deionized water solution;

[0031] ②In a constant temperature water bath at 20℃, dissolve 0.1g of anionic stabilizer sodium carboxymethylcellulose in 400g of deionized water, magnetically stir for 2h, then add ① to ②, while adjusting the pH value with sodium hydroxide To neutral, stir for 2 hours to obtain an aqueous solution containing nanoparticles, in which the weight ratio of deionized water, catalyst active components, and stabilizer sodium carboxyv methylcellulose is = 1:0.0002:0.0002;

[0032] ③Weigh the tooth shape Al 2 O 3 Carrier 100g, on which 50g of the above-prepared aqueous solution is impregnated;

[0033] ④ The carrier impregnated with the aqueous solution ③ is dried and calcined to prepare the catalyst to obtain the catalyst BC-1, wherein the Pd content is 0.01% of the total weight, and the palladium nanoparticle particle size distribution is 1-5 nm.

Embodiment 2

[0035] ①Pipe 50mgPd / ml of Pd(NO 3 ) 2 Solution 4ml, diluted to 100g with deionized water solution;

[0036] ②In a constant temperature water bath at 20℃, dissolve 0.2g of cationic stabilizer Polyquaternium-10 in 400g of deionized water, magnetically stir for 2h, then add ① to ②, while adjusting the pH with sodium hydroxide To neutral, stir for another 2h to obtain an aqueous solution containing nanoparticles, wherein the weight ratio of deionized water, catalyst active component, stabilizer polyquaternium-10 is = 1:0.0004:0.0004;

[0037] ③Weigh the tooth shape Al 2 O 3 Carrier 100g, on which 50g of the above-prepared aqueous solution is impregnated;

[0038] ④ The carrier impregnated with the aqueous solution ③ is dried and calcined to prepare the catalyst to obtain the catalyst BC-2, wherein the Pd content is 0.02% of the total weight, and the palladium nanoparticle particle size distribution is 1-8nm.

Embodiment 3

[0040] ①Pipe 50mgPd / ml of Pd(NO 3 ) 2 Solution 6ml, diluted to 100g with deionized water solution;

[0041] ②In a constant temperature water bath at 20℃, dissolve 0.3g of non-ionic stabilizer hydroxyethyl cellulose in 400g of deionized water, magnetically stir for 2h, then add ① to ② while adjusting the pH with sodium hydroxide To neutral, stir for 2 hours to obtain an aqueous solution containing nanoparticles, in which the weight ratio of deionized water, catalyst active components, and stabilizer hydroxyethyl cellulose is 1: 0.0006: 0.0006;

[0042] ③Weigh the tooth shape Al 2 O 3 Carrier 100g, on which 50g of the above-prepared aqueous solution is impregnated;

[0043] ④ The carrier impregnated with the aqueous solution ③ is dried and calcined to prepare the catalyst to obtain the catalyst BC-3, wherein the Pd content is 0.03% of the total weight, and the palladium nanoparticle particle size distribution is 1-10nm.

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Abstract

The invention discloses a preparation method of a C2 selective hydrogenation catalyst. The preparation method includes the steps of: 1) dissolving water-soluble cellulose ether in deionized water in a water bath, mixing with a salt solution of a catalyst active component, adjusting the pH value to a neutral state and stirring, wherein the weight ratio of deionized water, the catalyst active component and water-soluble cellulose ether is 1:(0.0001-0.001):(0.0001-0.005); 2) loading; and 3) drying and roasting. The of water-soluble cellulose ether provided by the invention can be used as an effective stabilizer to form in the solution mono dispersed palladium nanoparticles, which are loaded to a carrier by an immersion method to form more active centers. The method provided by the invention improves the catalyst activity and the selectivity hydrogenation products, enhances the dispersion and utilization rate of palladium and reduces the load capacity of palladium.

Description

Technical field [0001] The invention relates to the field of selective hydrogenation, and furthermore, to a method for preparing a carbon two selective hydrogenation catalyst. Background technique [0002] The liquid hydrocarbon cracked gas contains 0.1-0.5 mol% of acetylene, and the content of alkyne increases with the increase of the cracking depth. The presence of acetylene will poison the polyolefin catalyst. In order to obtain polymer-grade ethylene, the alkyne must be removed. The currently widely used method of deacetylation is catalytic selective hydrogenation. [0003] At present, the preparation method of selective hydrogenation catalyst is usually to directly impregnate the salt solution of palladium, and then prepare it after drying and roasting. [0004] Patent CN 1279126A discloses a catalyst for selective hydrogenation of alkynes and a preparation method thereof. The preparation method is to support the main active component Pd and the auxiliary active component Bi ...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J23/44C07C7/167C07C11/04
CPCY02P20/52
Inventor 戴伟杨元一张火利彭晖卫国宾鲁树亮
Owner CHINA PETROLEUM & CHEM CORP
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