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Selective hydrogenization catalyst and its preparing method and use

A technology of selective hydrogenation and catalyst, applied in the field of selective hydrogenation catalyst and its preparation and application, which can solve the problems of poor hydrogenation selectivity, low catalyst hydrogenation activity, and large amount of green oil generation

Inactive Publication Date: 2002-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional catalyst carrier, there are many small pores (<20nm) and micropores (20-50nm). When the active component such as metal palladium is supported on the surface of the carrier, the catalyst prepared is used to hydrogenate alkynes and dienes When , the amount of green oil generated is large, and the hydrogenation selectivity is poor
For the problems referred to above, US4762956 proposes the method that improves carrier calcination temperature to obtain the carrier with macropore, and catalyst carrier surface acidity is low, but the dispersion degree of the supported palladium catalyst metal palladium that carrier prepares like this is low, and catalyst hydrogenation activity is low

Method used

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  • Selective hydrogenization catalyst and its preparing method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Add 0.6ml of copper nitrate solution containing 10mg / mlCu and 0.85ml of palladium nitrate solution containing 4.7mg / mlPd into a beaker, then add 6.8ml of water, mix well, adjust the pH of the solution to 1.2 with nitric acid and ammonia water, and prepare Dipping solution. Take 20g of the same carrier as in Comparative Example 1 and put it into a 100ml beaker, add the prepared impregnating solution, impregnate the carrier, then dry at 120°C for 8 hours, decompose at 450°C in an air atmosphere to obtain the 2-1 catalyst, and use a scanning electron microscope to determine the catalyst 90% of the palladium and silver are distributed in the catalyst body from the surface of the carrier to a depth of 500-1000 microns.

Embodiment 2

[0057] Add 1.0ml of silver nitrate solution containing 10mg / mlAg and 0.85ml of palladium nitrate solution containing 4.7mg / mlPd into a beaker, then add 5.5ml of water, mix well, adjust the pH of the solution to 1.2 with nitric acid and ammonia water, and prepare Dipping solution. Take 20g of the same carrier as in Comparative Example 1 and put it into a 100ml beaker, add the prepared impregnating solution, impregnate the carrier, then dry at 120°C for 8 hours, decompose at 450°C in an air atmosphere to obtain the 2-2 catalyst, and use a scanning electron microscope to determine the catalyst 90% of the palladium and silver are distributed in the catalyst body from the surface of the carrier to a depth of 500-1000 microns.

Embodiment 3

[0059] Add 3.9ml of gold chloride solution containing 4.8mg / mlAu and 0.85ml of palladium nitrate solution containing 4.7mg / mlPd in ​​the beaker, then add 2.5ml of water, after mixing thoroughly, adjust the pH of the solution to 1.2 with nitric acid and ammonia water, Prepared as a dipping solution. Take 20 g of the same carrier as Comparative Example 1 and put it into a 100ml beaker, add the prepared impregnating solution, impregnate the carrier, then dry it at 120°C for 8 hours, and decompose it in an air atmosphere at 450°C to obtain the 2-3 catalyst, which is measured by scanning electron microscopy. 90% palladium and silver of the catalyst are distributed in the catalyst body from the surface of the carrier to a depth of 500-1000 microns.

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Abstract

The catalyst includes inorganic oxide carrier, main active metal Pd and IB family assistant active component, and the active metal component is distributed homogeneously in the carrier from the surface to 300 microns depth. The catalyst has high activity, high selectivity and capacity of resisting sulfur and arsenic poisoning, and is suitable for any C2 and C3 fractions with any H2 and CO content.

Description

technical field [0001] The invention relates to a catalyst with high activity and high selectivity for selective hydrogenation of alkyne and diene, its preparation method and application. Background technique [0002] It is known to contain 0.3-3% acetylene in the ethylene-rich fraction. Acetylene impurities are poisons of polyethylene catalysts, which affect the normal progress of ethylene polymerization. In order to avoid the above-mentioned catalyst poisoning phenomenon, the method of catalytic selective hydrogenation is usually used to convert acetylene in the ethylene-rich fraction into ethylene. However, in the selective hydrogenation removal of acetylene, the acetylene adsorbed on the surface of the support can easily generate unsaturated C such as 1,3-butadiene through hydrogenation dimerization. 4 Hydrocarbons, and these 1,3-butadiene and other unsaturated C 4 Hydrocarbons will continue to react with acetylene or ethylene or other unsaturated hydrocarbons to gene...

Claims

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Application Information

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IPC IPC(8): C10G45/34
Inventor 张谦温张菡
Owner CHINA PETROLEUM & CHEM CORP
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