Acetylene selected hydrogenation catalyst and its preparation method

A technology of selective hydrogenation and catalyst, applied in the field of simple palladium catalyst and its preparation, can solve the problems of strict equipment requirements, achieve the effect of improving utilization rate, increasing selectivity and shortening the preparation cycle

Active Publication Date: 2007-05-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1511634A discloses a method for activating catalysts, which uses high-energy active species in radio frequency plasma to perform discharge treatment on the pre-species of Pd-based catalysts; but this method has serious problems in large-scale industrial production due to strict equipment requirements
However, for alkyne selective hydrogenation catalysts, it is required to load a small amount (such as 0.01 to 0.5% by weight) of Pd content on the inorganic carrier, and the Pd layer is evenly distributed on the carrier. The method implements

Method used

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  • Acetylene selected hydrogenation catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Weigh 50g spherical Al 2 o 3 Add the carrier to 50ml of 3g / L SnCl 2 Sensitize in the sensitization solution, and then add the carrier to 50ml of 0.01g / L PdCl 2 activated in an acidic solution, the removed carrier was washed with distilled water, and the above steps were repeated 5 times. After sensitization and activation, the carrier contains 0.0035 g of palladium.

[0051] Add the activated carrier to 2.5g / L [Pd(NH 3 ) 2+ ] in the palladium plating solution, the total amount of Pd in ​​the plating solution is 0.0175g, under the condition of 45 ℃, add reducing agent hydrazine 2ml, stir, electroless plating 10min, after plating, rinse the solution with deionized water until there is no Cl - . Finally, under the condition of 105°C, dry for 18 hours to obtain the catalyst A, wherein the Pd content is 0.035% (wt), and the Sn content is 0.7% (wt).

Embodiment 2

[0053] Weigh 50g of extruded strip Al 2 o 3 Add the carrier to 40ml of 11g / L SnCl 2 Sensitize in the sensitization solution, then add the carrier to 80ml of 0.05g / L PdCl 2 activated in an acidic solution, the removed carrier was washed with distilled water, and the above steps were repeated 6 times. After sensitization and activation, the carrier contains 0.012g of palladium.

[0054] Add the activated carrier to 0.5g / L [Pd(NH 3 ) 2+ ] in the palladium plating solution, the total amount of Pd in ​​the plating solution is 0.0055g, under the condition of 40 ℃, add reducing agent hydrazine 2ml, stir, electroless plating 5min, after plating, rinse the solution with deionized water until there is no Cl - . Finally, under the condition of 120°C, dry for 10 hours to obtain the catalyst B, wherein the Pd content is 0.035% (wt), and the Sn content is 2.7% (wt).

Embodiment 3

[0056] Weigh 50g tooth type Al 2 o 3 Add the carrier to 100ml of 5g / L SnCl 2 Sensitize in the sensitization solution, and then add the carrier to 100ml of 0.1g / L PdCl 2 activated in an acidic solution, the removed carrier was washed with distilled water, and the above steps were repeated 3 times. After sensitization and activation, the carrier contains 0.02 g of palladium.

[0057] Add the activated carrier to 3g / L [Pd(NH 3 ) 2+ ] in the palladium plating solution, the total amount of Pd in ​​the plating solution is 0.015g, and at 75°C, the reducing agent NaH 2 PO 2 0.10g, stirring, electroless plating for 20min, after plating, rinse the solution with deionized water until there is no Cl in the washing solution - . Finally, under the condition of 120°C, dry for 5 hours to obtain the catalyst C, wherein the Pd content is 0.05% (wt), and the Sn content is 1.5% (wt).

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Abstract

This invention discloses an acetylene hydrocarbon hydrogenation selected accelerant and its preparation. This accelerant includes carrier, main active component palladium, stannum as co-active substance. The carrier chooses from diatomite, SiO2, TiO2 and Al2O3, and its shape includes particle, globular, lamellar, Dentate or strip, whose specific surface is 1-200m2 / g; The weight amount of main active component palladium in the form of simple substance is 0.01-1.0% that of total carrier weight. The weight amount of co-active component stannum is 0.01-3.0%. The Pd layer of this accelerant distributes rationally. The precious metal Pd distributes between 0 and 200 mum of the carrier outer shell, which improves the utilization rate of main active component Pd and reduces the possibility of side reaction.

Description

technical field [0001] The invention relates to an alkyne selective hydrogenation catalyst and a preparation method thereof, in particular to an elemental palladium catalyst directly prepared by an electroless plating method and a preparation method thereof. Background technique [0002] In the field of petrochemical industry, the ethylene fraction in the cracking and separation section contains 0.3-3% acetylene. This acetylene impurity is a poison to the polyethylene catalyst and affects the normal progress of ethylene polymerization. In order to avoid the above-mentioned catalyst poisoning phenomenon, the method of catalyst selective hydrogenation is usually used to convert acetylene in the ethylene fraction into ethylene. However, in the reaction of selective hydrogenation to remove acetylene, the acetylene adsorbed on the surface of the catalyst is easily deeply hydrogenated to ethane, or 1,3-butadiene and other unsaturated C 4 hydrocarbons, and they continue to react t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/34
Inventor 郭彦来卫国宾彭晖穆玮何耕云刘海江朱警
Owner CHINA PETROLEUM & CHEM CORP
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