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Catalyst comprising palladium and silver, and its application for selective hydrogenation

Inactive Publication Date: 2013-11-14
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention proposes a new catalyst and a method for preparing it, which is particularly effective in converting unsaturated compounds in oil cuts into alkenes without creating alkanes. This process is called selective hydrogenation.

Problems solved by technology

These studies further revealed the difficulty in obtaining the desired synergistic effect, this effect being conditional upon the method of synthesis selected.

Method used

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  • Catalyst comprising palladium and silver, and its application for selective hydrogenation
  • Catalyst comprising palladium and silver, and its application for selective hydrogenation
  • Catalyst comprising palladium and silver, and its application for selective hydrogenation

Examples

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example 1

Preparation of a Catalyst C1 According to the Invention

[0143]This example shows the preparation of a catalyst according to the invention comprising impregnation of the support in two stages according to the process of the invention, that is, by using a colloidal solution for the Pd. The catalyst obtained comprises a fine crust of palladium and silver having a proximity ratio PR on a scale of 0.5 to 2.

[0144]A colloidal suspension of Pd oxide is prepared under agitation at 25° C. by diluting 1.8 g of a solution of palladium nitrate Pd(NO3)2 containing 8.5 wt. % of palladium Pd with approximately 45 ml demineralised water, then adding approximately 10 ml of sodium hydroxide solution to give a pH of 2.4. The suspension is then diluted with demineralised water to a volume which corresponds to the pore volume of the alumina support. This solution is then impregnated onto 80 grams of an alumina having a specific surface area of 71 m2 / g, moulded into the form of beads. A maturation step for...

example 2

Preparation of a Catalyst C2 According to the Invention

[0148]This example is identical to Example 1 with the exception of the palladium concentration, which is half as high as in Example 1. This gives a catalyst with a thinner crust and a better proximity factor PR.

[0149]A colloidal suspension of Pd oxide is prepared under agitation at 25° C. by diluting 0.95 g of a solution of palladium nitrate Pd(NO3)2 containing 8.5 wt. % of palladium Pd with approximately 45 ml demineralised water, then adding approximately 10 ml of sodium hydroxide solution to give a pH of 2.4. The suspension is then diluted with demineralised water to a volume which corresponds to the pore volume of the alumina support. This solution is then impregnated onto 80 grams of an alumina having a specific surface area of 71 m2 / g, moulded into the form of beads. A maturation step for the impregnated support is carried out before drying in air in a confined moist medium, for a period of 20 h. The solid obtained is drie...

example 3

Preparation of a Catalyst C3 not Conforming to the Invention

[0153]This example shows the preparation of a catalyst not conforming to the invention comprising impregnation of the support in two stages according to conventional impregnation methods (that is, without using a colloidal solution for the Pd). The catalyst obtained comprises a relatively thick crust, but having a proximity ratio PR on a scale of 0.5 to 2.

[0154]A solution of palladium nitrate is prepared under agitation at 25° C. by diluting 2.7 g of a solution of palladium nitrate Pd(NO3)2 containing 8.5 wt. % of palladium Pd with approximately 50 ml demineralised water. This solution is then impregnated onto 80 g of an alumina having a specific surface area of 71 m2 / g, moulded into the form of beads. The solid obtained is dried in air for 2 h at 120° C. The catalyst is then calcined in a stream of air at 450° C. for 2 h.

[0155]The solid obtained is immersed in 500 ml of a 2.3 g / l solution of formic acid. The solution is ag...

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Abstract

Disclosed are a catalyst, its preparation and use in selective hydrogenation, which catalyst has a porous support grain on which are deposited palladium and silver, and at least one alkali and / or alkaline earth metal; the porous support contains a refractory silica, alumina and / or silica-alumina oxide, where at least 80 wt. % of the palladium is distributed in a crust at the periphery of the support, and at least 80 wt. % of the silver is distributed in a crust at the periphery of the support, the local content of palladium at each point along the diameter of the grain follows the same course as the local content of silver.

Description

[0001]The process of selective hydrogenation allows the polyunsaturated compounds in oil cuts to be transformed by conversion of the most unsaturated compounds into the corresponding alkenes while avoiding total saturation and thus the formation of the corresponding alkanes.[0002]The object of the invention is to propose a catalyst and a method for preparing the said catalyst. This catalyst performs very well in processes of selective hydrogenation of the unsaturated hydrocarbon compounds present in hydrocarbon cuts, preferably cuts derived by steam cracking and / or catalytic cracking, and in particular from C3 cuts.PRIOR ART[0003]The catalysts of selective hydrogenation of these cuts are often palladium-based, in the form of small particles of metal deposited on a support which may be a refractory oxide in the form of beads, extrudates or trilobes, or forms having other geometries. The palladium content and the size of the particles of palladium are among the criteria that are impor...

Claims

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Application Information

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IPC IPC(8): B01J23/66
CPCB01J23/66C10G45/40B01J37/0242B01J37/08B01J37/10B01J37/16B01J23/58C07C7/163C07C7/167Y02P20/52B01J35/396B01J35/397B01J35/393B01J35/19B01J35/613B01J35/615C07C11/06B01J23/50B01J37/009B01J37/0236B01J37/024
Inventor CABIAC, AMANDINEZOZAYA, VINCENTCHAMBARD, ALEXANDRETHOMAZEAU, CECILE
Owner INST FR DU PETROLE
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