Catalyst for selective hydrogenation of pyrolysis gasoline and use method thereof

Abstract

The invention discloses a catalyst for selective hydrogenation of pyrolysis gasoline. The catalyst comprises an alumina supporter with a pore-expanding structure, wherein the alumina supporter is supported with metal palladium and nickel oxide, the content of the metal palladium is 0.1-0.15% of total weight of the catalyst, and the content of the nickel oxide is 8-10% of the total weight of the catalyst. The surface of the obtained alumina supporter with the pore-expanding structure is modified by using calcium, and the surface of the supporter is further modified by combining with impregnation way, and part of micropores formed in the surface of the supporter can be effectively peptized, so that reduction of the proportion of micropores in the surface of the supporter is facilitated, thegeneration of more active site supporting centers on the surface of the supporter is promoted, the utilization rate of the active component nickel is effectively improved, and the selective hydrogenation activity of the pyrolysis gasoline is improved. In addition, the inner and outer components of the supporter are different in concentration, so that the phenomenon is avoided that alkyne and alkadiene easily enter pore channels cause polymerization reaction and the pore channels are blocked.

Description

technical field

[0001] The invention relates to the field of petrochemical industry, in particular to a catalyst for selective hydrogenation of pyrolysis gasoline and its application method. Background technique

[0002] Dienes and alkynes in pyrolysis gasoline are easy to polymerize into colloids at high temperature, deposit on the surface of the catalyst, and easily cause catalyst deactivation, which must be frequently activated and regenerated. The first-stage hydrogenation catalyst of pyrolysis gasoline mainly includes Pd / Al 2 o 3 and Ni / Al 2 o 3 two catalysts. Pd-based catalysts have the advantages of low initial temperature, high hydrogenation activity, high space velocity, and long service life. The catalysts that have been used in industry include Pd-Cr / Al 2 o 3 , Pd / Al 2 o 3 . Usually, pyrolysis gasoline hydrogenation catalysts impregnate the carrier with a solution of metal salts of active components or organometallic compounds, and then load the active co...

Examples

Embodiment 1

[0024] A catalyst for the selective hydrogenation of pyrolysis gasoline, comprising an alumina carrier with a pore-expanding structure, the alumina carrier is loaded with metal palladium and nickel oxide, and the content of the metal palladium is based on the total weight of the catalyst 0.1%, the content of the nickel oxide is 8% based on the total weight of the catalyst.

[0025] The alumina carrier uses chitosan as a pore-enlarging agent, and the pore-enlarging agent is 22% based on the total weight of the catalyst.

[0026] The pore expander contains a calcium additive, and the content of the calcium additive is 3% based on the total weight of the catalyst.

[0027] A preparation method of catalyst, comprising the following steps:

[0028] S1, spraying the hydrogen peroxide solution on the alumina carrier;

[0029] S2, impregnating a solution containing nickel oxide on the alumina carrier treated in step S1;

[0030] S3, drying at 150°C for 6 hours, and roasting at 500°...

Embodiment 2

[0036] A catalyst for the selective hydrogenation of pyrolysis gasoline, comprising an alumina carrier with a pore-expanding structure, the alumina carrier is loaded with metal palladium and nickel oxide, and the content of the metal palladium is based on the total weight of the catalyst 0.15%, the content of the nickel oxide is 10% based on the total weight of the catalyst.

[0037] The alumina carrier uses chitosan as a pore-enlarging agent, and the pore-enlarging agent is 20% based on the total weight of the catalyst.

[0038] The pore expander contains a calcium additive, and the content of the calcium additive is 2% based on the total weight of the catalyst.

[0039] A preparation method of catalyst, comprising the following steps:

[0040] S1, spraying the hydrogen peroxide solution on the alumina carrier;

[0041] S2, impregnating a solution containing nickel oxide on the alumina carrier treated in step S1;

[0042] S3, drying at 140°C for 8 hours, and roasting at 60...

Embodiment 3

[0048] A catalyst for the selective hydrogenation of pyrolysis gasoline, comprising an alumina carrier with a pore-expanding structure, the alumina carrier is loaded with metal palladium and nickel oxide, and the content of the metal palladium is based on the total weight of the catalyst 0.12%, the content of the nickel oxide is 9% based on the total weight of the catalyst.

[0049] The alumina carrier uses chitosan as a pore-enlarging agent, and the pore-enlarging agent is 21% based on the total weight of the catalyst.

[0050] The pore expander contains a calcium additive, and the content of the calcium additive is 2.5% based on the total weight of the catalyst.

[0051] A preparation method of catalyst, comprising the following steps:

[0052] S1, spraying the hydrogen peroxide solution on the alumina carrier;

[0053] S2, impregnating a solution containing nickel oxide on the alumina carrier treated in step S1;

[0054] S3, drying at 145°C for 7 hours, and roasting at 5...

technical field

[0001] The invention relates to the field of petrochemical industry, in particular to a catalyst for selective hydrogenation of pyrolysis gasoline and its application method. Background technique

[0002] Dienes and alkynes in pyrolysis gasoline are easy to polymerize into colloids at high temperature, deposit on the surface of the catalyst, and easily cause catalyst deactivation, which must be frequently activated and regenerated. The first-stage hydrogenation catalyst of pyrolysis gasoline mainly includes Pd / Al 2 o 3 and Ni / Al 2 o 3 two catalysts. Pd-based catalysts have the advantages of low initial temperature, high hydrogenation activity, high space velocity, and long service life. The catalysts that have been used in industry include Pd-Cr / Al 2 o 3 , Pd / Al 2 o 3 . Usually, pyrolysis gasoline hydrogenation catalysts impregnate the carrier with a solution of metal salts of active components or organometallic compounds, and then load the active co...

Examples

Embodiment 1

[0024] A catalyst for the selective hydrogenation of pyrolysis gasoline, comprising an alumina carrier with a pore-expanding structure, the alumina carrier is loaded with metal palladium and nickel oxide, and the content of the metal palladium is based on the total weight of the catalyst 0.1%, the content of the nickel oxide is 8% based on the total weight of the catalyst.

[0025] The alumina carrier uses chitosan as a pore-enlarging agent, and the pore-enlarging agent is 22% based on the total weight of the catalyst.

[0026] The pore expander contains a calcium additive, and the content of the calcium additive is 3% based on the total weight of the catalyst.

[0027] A preparation method of catalyst, comprising the following steps:

[0028] S1, spraying the hydrogen peroxide solution on the alumina carrier;

[0029] S2, impregnating a solution containing nickel oxide on the alumina carrier treated in step S1;

[0030] S3, drying at 150°C for 6 hours, and roasting at 500°...

Embodiment 2

[0036] A catalyst for the selective hydrogenation of pyrolysis gasoline, comprising an alumina carrier with a pore-expanding structure, the alumina carrier is loaded with metal palladium and nickel oxide, and the content of the metal palladium is based on the total weight of the catalyst 0.15%, the content of the nickel oxide is 10% based on the total weight of the catalyst.

[0037] The alumina carrier uses chitosan as a pore-enlarging agent, and the pore-enlarging agent is 20% based on the total weight of the catalyst.

[0038] The pore expander contains a calcium additive, and the content of the calcium additive is 2% based on the total weight of the catalyst.

[0039] A preparation method of catalyst, comprising the following steps:

[0040] S1, spraying the hydrogen peroxide solution on the alumina carrier;

[0041] S2, impregnating a solution containing nickel oxide on the alumina carrier treated in step S1;

[0042] S3, drying at 140°C for 8 hours, and roasting at 60...

Embodiment 3

[0048] A catalyst for the selective hydrogenation of pyrolysis gasoline, comprising an alumina carrier with a pore-expanding structure, the alumina carrier is loaded with metal palladium and nickel oxide, and the content of the metal palladium is based on the total weight of the catalyst 0.12%, the content of the nickel oxide is 9% based on the total weight of the catalyst.

[0049] The alumina carrier uses chitosan as a pore-enlarging agent, and the pore-enlarging agent is 21% based on the total weight of the catalyst.

[0050] The pore expander contains a calcium additive, and the content of the calcium additive is 2.5% based on the total weight of the catalyst.

[0051] A preparation method of catalyst, comprising the following steps:

[0052] S1, spraying the hydrogen peroxide solution on the alumina carrier;

[0053] S2, impregnating a solution containing nickel oxide on the alumina carrier treated in step S1;

[0054] S3, drying at 145°C for 7 hours, and roasting at 5...