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Selective hydrogenation catalysts for c3 hydrocarbon fractions from steam cracking and/or catalytic cracking

A catalyst and activity technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, molecular sieve catalyst, selective hydrogenation refining, etc., can solve problems such as poor activity and selectivity loss

Active Publication Date: 2022-08-02
INST FR DU PETROLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typically, these elements must be located in the shell (croûte) at the periphery of the support to avoid problems with intragranular material transfer, which can lead to undesirable activity and loss of selectivity

Method used

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  • Selective hydrogenation catalysts for c3 hydrocarbon fractions from steam cracking and/or catalytic cracking
  • Selective hydrogenation catalysts for c3 hydrocarbon fractions from steam cracking and/or catalytic cracking
  • Selective hydrogenation catalysts for c3 hydrocarbon fractions from steam cracking and/or catalytic cracking

Examples

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preparation example Construction

[0069] More particularly, the preparation method of the catalyst according to the present invention generally comprises the following steps:

[0070] - step a) for preparing an aqueous solution comprising at least one palladium precursor salt;

[0071] - step b) for the preparation of a porous support by impregnating said suspension obtained in step a) on a porous support comprising at least one refractory oxide selected from the group consisting of silica, alumina and silica-alumina impregnated carrier;

[0072] - optionally, step c) for curing the impregnated support;

[0073] - step d) for drying the catalyst precursor obtained in step b) or c);

[0074] - optionally, step e) for calcining the dried catalyst obtained in step d) at a temperature of 250°C to 900°C;

[0075] - step f) for carrying out the dried catalyst obtained in step d) or step e) at a temperature of 500°C to 900°C in air, preferably in combustion air comprising 150 to 5000 grams of water per kilogram of...

Embodiment 8

[0108] Example 8 relates to the measurement of the metal dispersion D of catalysts C1 to C7.

Embodiment 9

[0109] Example 9 relates to the use of these catalysts in the selective hydrogenation of C3 cuts.

[0110] These examples are presented by way of illustration, and do not limit the scope of the invention in any way.

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Abstract

The present invention discloses selective hydrogenation catalysts for C3 hydrocarbon fractions from steam cracking and / or catalytic cracking. A catalyst comprising an active phase consisting of palladium and a porous support comprising at least one refractory oxide selected from the group consisting of silica, alumina and silica-alumina, wherein: the palladium content in the catalyst is relative to the catalyst 0.0025 wt % to 1 wt % of the total weight; at least 80 wt % of the palladium is distributed in the shell layer at the outer periphery of the porous support, the thickness of the shell layer is 25 to 500 µm; the specific surface area of ​​the porous support is 1 to 500 µm 50 m 2 / g; ● The metal dispersion D of palladium is less than 20%.

Description

technical field [0001] Selective hydrogenation processes can be used to convert the polyunsaturated compounds of crude oil fractions by converting most of the unsaturated compounds to the corresponding olefins, avoiding complete saturation and the resulting formation of the corresponding alkanes. [0002] The object of the present invention is to propose a catalyst with improved properties for the selective hydrogenation of unsaturated hydrocarbon compounds present in C3 hydrocarbon fractions from steam cracking and / or from catalytic cracking and a way of preparing such a catalyst Excellent performance in the method. Background technique [0003] Catalysts for the selective hydrogenation of C3 cuts from steam cracking and / or catalytic cracking are generally based on palladium in the form of small metal particles deposited on a support which may be a refractory oxide. The palladium content and the size of the palladium particles are some of the criteria that are important fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J35/10B01J37/02B01J37/10C10G45/40B01J35/00
CPCB01J23/44B01J37/0201B01J37/10C10G45/40B01J35/612B01J35/60B01J35/613B01J35/393B01J2235/00B01J35/45B01J37/18B01J29/76C07C5/09C07C5/05B01J21/04B01J37/0236B01J35/394B01J35/19C07C11/06Y02P20/52B01J21/08B01J21/12B01J35/40B01J37/0213B01J37/08B01J37/16C07C7/163C07C7/167
Inventor M.布瓦莱格P.阿弗尼耶
Owner INST FR DU PETROLE